Sizing Calculator

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property="article:author" content="" /><meta name="twitter:card" content="summary" /><meta name="twitter:title" content="Off Grid Calculator | altE" /><meta name="twitter:description" content="The altE Off-Grid Solar Panel System Calculator helps you size the battery bank, watts of solar panels and the solar charge controller you need." /><meta name="twitter:site" content="@altestore" /><meta name="twitter:creator" content="@altestore" /><meta name="twitter:image:alt" content="Off Grid Calculator | altE" /><link href="https://www.facebook.com/altestore" rel="publisher" /><script data-pagespeed-orig-type="text/javascript" type="text/psajs" orig_index="7">function doMath(){whpd=document.getElementById('id_watt_hours_per_day').value;bkup_days=document.getElementById('id_days_of_backup_power').value;lowest_temp=document.getElementById('id_off_lowest_batt_temp').value;batt_voltage=document.getElementById('id_off_batt_bank_voltage').value;var bb_wh=whpd*2;bb_wh*=1.15;bb_wh*=bkup_days;bb_wh*=lowest_temp;bb_cap=Math.ceil(bb_wh/batt_voltage);per_string=Math.ceil(bb_cap/3.0);document.getElementById('battOut1').innerHTML='Battery Bank Capacity: <strong>'+Math.ceil(bb_wh)+' watt hours</strong>';document.getElementById('battOut2').innerHTML='Battery Bank Capacity: <strong>'+bb_cap+' amp hours</strong><br>'+'3 String Configuration: <strong>'+per_string+' amp hours</strong> per string';kwh_per_month=(whpd*30)/1000;sunhrs=document.getElementById('id_og_loc_avg_sun_hrs').value;kwatts=(kwh_per_month/30/sunhrs)*1.3;if(!isNaN(kwatts)){document.getElementById('id_og_min_watts').value=round2(kwatts*1000,1);document.getElementById('id_og_min_kwatts').value=round2(kwatts,2);}panelwatts=document.getElementById('id_og_sp_wattage_select').value;if(!isNaN(panelwatts)&&panelwatts>0){numpanels=Math.ceil((kwatts/panelwatts)*1000);totalwatts=numpanels*panelwatts;cc_amps=Math.ceil(totalwatts/batt_voltage);document.getElementById('id_og_total_watts').value=totalwatts;document.getElementById('id_og_total_panels').value=numpanels;document.getElementById('id_og_inverter_watts').value=cc_amps;}}function round2(rnum,rlen){return Math.round(rnum*Math.pow(10,rlen))/Math.pow(10,rlen);}</script><script type="text/psajs" orig_index="8">(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new 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href="/store/charge-controllers/solar-charge-controllers/pwm-solar-charge-controllers/xantrex-solar-charge-controllers-pwm/accessories-for-xantrex-pwm-charge-cntrl-c1028/">Accessories for Xantrex PWM Charge Cntrl.</a></li> </ul> </li> </ul> </li> <li id="cat-1213"><a href="/store/charge-controllers/solar-charge-controllers/electric-vehicle-golf-cart-chargers-c1213/">Electric Vehicle &amp; Golf Cart Chargers.</a></li> </ul> </li> <li id="cat-480"><a href="/store/charge-controllers/solar-lighting-controllers-c480/">Solar Lighting Controllers.</a></li> <li id="cat-473"><a href="/store/charge-controllers/ac-battery-chargers-c473/">AC Battery Chargers.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1027"><a href="/store/charge-controllers/ac-battery-chargers/accessories-for-the-ac-chargers-c1027/">Accessories for the AC Chargers.</a></li> </ul> </li> <li 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href="/store/charge-controllers/temperature-sensors-c472/">Temperature Sensors.</a></li> </ul> </li> <li id="cat-497"><a href="/store/inverters-c497/">Inverters.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-559"><a href="/store/inverters/off-grid-inverters-c559/">Off-Grid Inverters.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-600"><a href="/store/inverters/off-grid-inverters/100-to-999-watts-c600/">100 To 999 Watts.</a></li> <li id="cat-601"><a href="/store/inverters/off-grid-inverters/1000-to-1999-watts-c601/">1000 to 1999 Watts.</a></li> <li id="cat-602"><a href="/store/inverters/off-grid-inverters/2000-to-2999-watts-c602/">2000 to 2999 Watts.</a></li> <li id="cat-603"><a href="/store/inverters/off-grid-inverters/3000-to-7000-watts-c603/">3000 To 7000 Watts.</a></li> </ul> </li> <li id="cat-560"><a href="/store/inverters/grid-tie-inverters-c560/">Grid-Tie Inverters.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-606"><a href="/store/inverters/grid-tie-inverters/1500w-to-4000w-grid-tie-inverters-c606/">1500W to 4000W Grid Tie Inverters.</a></li> <li id="cat-607"><a href="/store/inverters/grid-tie-inverters/5000w-to-7700-watt-grid-tie-inverters-c607/">5000W TO 7700 Watt Grid Tie Inverters.</a></li> <li id="cat-608"><a href="/store/inverters/grid-tie-inverters/8kw-and-commercial-grid-tie-inverters-c608/">8kW+ and Commercial Grid Tie Inverters.</a></li> </ul> </li> <li id="cat-1249"><a href="/store/inverters/micro-inverters-c1249/">Micro Inverters.</a></li> <li id="cat-561"><a href="/store/inverters/hybrid-inverters-c561/">Hybrid Inverters.</a></li> <li id="cat-556"><a href="/store/inverters/marine-inverters-c556/">Marine Inverters.</a></li> <li id="cat-498"><a href="/store/inverters/inverter-accessories-c498/">Inverter Accessories.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1191"><a href="/store/inverters/inverter-accessories/enphase-inverter-accessories-c1191/">Enphase Inverter Accessories.</a></li> <li id="cat-1195"><a href="/store/inverters/inverter-accessories/fronius-inverter-accessories-c1195/">Fronius Inverter Accessories.</a></li> <li id="cat-1192"><a href="/store/inverters/inverter-accessories/magnum-inverter-accessories-c1192/">Magnum Inverter Accessories.</a></li> <li id="cat-1163"><a href="/store/inverters/inverter-accessories/outback-inverter-accessories-c1163/">Outback Inverter Accessories.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1113"><a href="/store/inverters/inverter-accessories/outback-inverter-accessories/inverter-bypass-switches-c1113/">Inverter Bypass Switches.</a></li> </ul> </li> <li id="cat-1216"><a href="/store/inverters/inverter-accessories/samlex-inverter-accessories-c1216/">Samlex Inverter Accessories.</a></li> <li id="cat-1196"><a href="/store/inverters/inverter-accessories/sma-inverter-accessories-c1196/">SMA Inverter Accessories.</a></li> <li id="cat-1194"><a href="/store/inverters/inverter-accessories/solectria-inverter-accessories-c1194/">Solectria Inverter Accessories.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1242"><a href="/store/inverters/inverter-accessories/solectria-inverter-accessories/solectria-warranty-extensions-c1242/">Solectria Warranty Extensions.</a></li> </ul> </li> <li id="cat-1144"><a href="/store/inverters/inverter-accessories/xantrex-inverter-accessories-c1144/">Xantrex Inverter Accessories.</a></li> <li id="cat-1248"><a href="/store/inverters/inverter-accessories/abb-power-one-inverter-accessories-c1248/">ABB (Power One) Inverter Accessories.</a></li> <li id="cat-644"><a href="/store/inverters/inverter-accessories/remote-controls-c644/">Remote Controls.</a></li> <li id="cat-1258"><a href="/store/inverters/inverter-accessories/schneider-electric-inverter-accessories-c1258/">Schneider Electric Inverter Accessories.</a></li> <li id="cat-1262"><a href="/store/inverters/inverter-accessories/solaredge-inverter-accessories-c1262/">SolarEdge Inverter Accessories.</a></li> <li id="cat-562"><a href="/store/inverters/inverter-accessories/stacking-kits-c562/">Stacking Kits.</a></li> </ul> </li> </ul> </li> <li id="cat-434"><a href="/store/deep-cycle-batteries-c434/">Deep Cycle Batteries.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-4441"><a href="/store/deep-cycle-batteries/lithium-batteries-c4441/">Lithium Batteries.</a></li> <li id="cat-435"><a href="/store/deep-cycle-batteries/flooded-lead-acid-batteries-c435/">Flooded Lead Acid Batteries.</a></li> <li id="cat-436"><a href="/store/deep-cycle-batteries/sealed-agm-batteries-c436/">Sealed Agm Batteries.</a></li> <li id="cat-437"><a href="/store/deep-cycle-batteries/sealed-gel-cell-batteries-c437/">Sealed Gel Cell Batteries.</a></li> <li id="cat-1260"><a href="/store/deep-cycle-batteries/saltwater-batteries-c1260/">Saltwater Batteries.</a></li> <li id="cat-512"><a href="/store/deep-cycle-batteries/desulphators-c512/">Desulphators.</a></li> <li id="cat-524"><a href="/store/deep-cycle-batteries/battery-boxes-c524/">Battery Boxes.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1014"><a href="/store/deep-cycle-batteries/battery-boxes/cabinet-style-battery-boxes-c1014/">Cabinet Style Battery Boxes.</a></li> <li id="cat-1015"><a href="/store/deep-cycle-batteries/battery-boxes/chest-style-battery-boxes-c1015/">Chest Style Battery Boxes.</a></li> <li id="cat-1016"><a href="/store/deep-cycle-batteries/battery-boxes/pole-mounted-battery-boxes-c1016/">Pole Mounted Battery Boxes.</a></li> <li id="cat-1017"><a href="/store/deep-cycle-batteries/battery-boxes/rack-type-battery-boxes-c1017/">Rack Type Battery Boxes.</a></li> <li id="cat-1013"><a href="/store/deep-cycle-batteries/battery-boxes/accessories-for-battery-boxes-c1013/">Accessories for Battery Boxes.</a></li> </ul> </li> <li id="cat-1212"><a href="/store/deep-cycle-batteries/battery-maintenance-tools-c1212/">Battery Maintenance Tools.</a></li> <li id="cat-714"><a href="/store/deep-cycle-batteries/ventilatorsbattery-fans-c714/">Ventilators/Battery Fans.</a></li> </ul> </li> <li> <div class="tree_header">MORE PRODUCTS</div> </li> <li id="cat-463"><a href="/store/cables-wiring-c463/">Cables &amp; Wiring.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-465"><a href="/store/cables-wiring/battery-interconnect-cables-c465/">Battery Interconnect Cables.</a></li> <li id="cat-464"><a href="/store/cables-wiring/battery-to-inverter-cables-c464/">Battery to Inverter Cables.</a></li> <li id="cat-471"><a href="/store/cables-wiring/cable-wire-tools-c471/">Cable &amp; Wire Tools.</a></li> <li id="cat-467"><a href="/store/cables-wiring/solar-panel-wiring-c467/">Solar Panel Wiring.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1169"><a href="/store/cables-wiring/solar-panel-wiring/grounding-and-wiring-accessories-c1169/">Grounding and Wiring Accessories.</a></li> </ul> </li> <li id="cat-468"><a href="/store/cables-wiring/wire-by-the-foot-c468/">Wire By The Foot.</a></li> </ul> </li> <li id="cat-438"><a href="/store/enclosures-electrical-safety-c438/">Enclosures, Electrical &amp; Safety.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1098"><a href="/store/enclosures-electrical-safety/electrical-enclosures-c1098/">Electrical Enclosures.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-494"><a href="/store/enclosures-electrical-safety/electrical-enclosures/combiner-pass-through-boxes-c494/">Combiner &amp; Pass-Through Boxes.</a></li> <li id="cat-882"><a href="/store/enclosures-electrical-safety/electrical-enclosures/disconnectload-enclosures-c882/">Disconnect/Load Enclosures.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1099"><a href="/store/enclosures-electrical-safety/electrical-enclosures/disconnectload-enclosures/ac-c1099/">Ac.</a></li> <li id="cat-1104"><a href="/store/enclosures-electrical-safety/electrical-enclosures/disconnectload-enclosures/ac-andor-dc-c1104/">AC and/or DC.</a></li> <li id="cat-1100"><a href="/store/enclosures-electrical-safety/electrical-enclosures/disconnectload-enclosures/dc-c1100/">Dc.</a></li> </ul> </li> <li id="cat-1228"><a href="/store/enclosures-electrical-safety/electrical-enclosures/disconnecting-combiner-boxes-c1228/">Disconnecting Combiner Boxes.</a></li> <li id="cat-1255"><a href="/store/enclosures-electrical-safety/electrical-enclosures/rapid-system-shutdown-components-c1255/">Rapid System Shutdown Components.</a></li> </ul> </li> <li id="cat-1097"><a href="/store/enclosures-electrical-safety/overcurrent-devices-fuses-breakers-c1097/">Overcurrent Devices (Fuses &amp; Breakers).</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1226"><a href="/store/enclosures-electrical-safety/overcurrent-devices-fuses-breakers/din-rail-circuit-breakers-c1226/">Din Rail Circuit Breakers.</a></li> <li id="cat-537"><a href="/store/enclosures-electrical-safety/overcurrent-devices-fuses-breakers/fuse-fuseblocks-c537/">Fuse &amp; Fuseblocks.</a></li> <li id="cat-1227"><a href="/store/enclosures-electrical-safety/overcurrent-devices-fuses-breakers/panel-mount-circuit-breakers-c1227/">Panel Mount Circuit Breakers.</a></li> </ul> </li> <li id="cat-579"><a href="/store/enclosures-electrical-safety/lightning-protection-c579/">Lightning Protection.</a></li> <li id="cat-1096"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts-c1096/">Miscellaneous Electrical Parts.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1108"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/busbars-c1108/">Busbars.</a></li> <li id="cat-513"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/diodes-c513/">Diodes.</a></li> <li id="cat-540"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/generator-starters-c540/">Generator Starters.</a></li> <li id="cat-1076"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/power-distribution-blocks-c1076/">Power Distribution Blocks.</a></li> <li id="cat-642"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/relays-c642/">Relays.</a></li> <li id="cat-445"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/switches-c445/">Switches.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-446"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/switches/dc-switches-c446/">DC Switches.</a></li> <li id="cat-694"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/switches/timers-c694/">Timers.</a></li> <li id="cat-521"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/switches/transfer-switches-c521/">Transfer Switches.</a></li> <li id="cat-522"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/switches/voltage-control-switches-c522/">Voltage Control Switches.</a></li> </ul> </li> <li id="cat-708"><a href="/store/enclosures-electrical-safety/miscellaneous-electrical-parts/transformers-c708/">Transformers.</a></li> </ul> </li> <li id="cat-1146"><a href="/store/enclosures-electrical-safety/nec-compliant-safety-labels-c1146/">NEC Compliant Safety Labels.</a></li> <li id="cat-1129"><a href="/store/enclosures-electrical-safety/outback-flexware-components-c1129/">Outback Flexware Components.</a></li> <li id="cat-1095"><a href="/store/enclosures-electrical-safety/switch-gear-disconnects-c1095/">Switch Gear Disconnects.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1101"><a href="/store/enclosures-electrical-safety/switch-gear-disconnects/switch-gear-disconnects-ac-c1101/">Switch Gear Disconnects - AC.</a></li> <li id="cat-1102"><a href="/store/enclosures-electrical-safety/switch-gear-disconnects/switchgear-disconnects-dc-c1102/">Switchgear Disconnects - DC.</a></li> </ul> </li> <li id="cat-545"><a href="/store/enclosures-electrical-safety/ground-fault-protection-c545/">Ground Fault Protection.</a></li> </ul> </li> <li id="cat-1247"><a href="/store/heat-pump-water-heaters-c1247/">Heat Pump Water Heaters.</a></li> <li id="cat-626"><a href="/store/inverter-power-panels-c626/">Inverter Power Panels.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-4443"><a href="/store/inverter-power-panels/alte-pre-wired-systems-c4443/">altE Pre-Wired Systems.</a></li> <li id="cat-1254"><a href="/store/inverter-power-panels/magnum-power-panels-c1254/">Magnum Power Panels.</a></li> <li id="cat-883"><a href="/store/inverter-power-panels/midnite-solar-power-panels-c883/">Midnite Solar Power Panels.</a></li> <li id="cat-1174"><a href="/store/inverter-power-panels/outback-flexpower-systems-c1174/">Outback Flexpower Systems.</a></li> <li id="cat-4448"><a href="/store/inverter-power-panels/outback-systemedge-packages-c4448/">Outback SystemEdge Packages.</a></li> </ul> </li> <li id="cat-442"><a href="/store/meters-communications-site-analysis-c442/">Meters, Communications &amp; Site Analysis.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-443"><a href="/store/meters-communications-site-analysis/meters-battery-monitors-c443/">Meters &amp; Battery Monitors.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-444"><a href="/store/meters-communications-site-analysis/meters-battery-monitors/ammeters-voltmeters-battery-monitors-c444/">Ammeters, Voltmeters, Battery Monitors.</a></li> <li id="cat-631"><a href="/store/meters-communications-site-analysis/meters-battery-monitors/power-meters-c631/">Power Meters.</a></li> </ul> </li> <li id="cat-507"><a href="/store/meters-communications-site-analysis/solar-monitoring-systems-c507/">Solar Monitoring Systems.</a></li> <li id="cat-891"><a href="/store/meters-communications-site-analysis/solar-site-analysis-tools-c891/">Solar Site Analysis Tools.</a></li> <li id="cat-650"><a href="/store/meters-communications-site-analysis/shunts-c650/">Shunts.</a></li> <li id="cat-727"><a href="/store/meters-communications-site-analysis/wind-meters-anemometers-c727/">Wind Meters (Anemometers).</a></li> </ul> </li> <li id="cat-523"><a href="/store/portable-power-systems-c523/">Portable Power Systems.</a></li> <li id="cat-636"><a href="/store/refrigerators-freezers-c636/">Refrigerators &amp; Freezers.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-640"><a href="/store/refrigerators-freezers/gas-refrigerators-fridges-c640/">Gas Refrigerators &amp; Fridges.</a></li> <li id="cat-639"><a href="/store/refrigerators-freezers/solar-powered-refrigerators-freezers-c639/">Solar Powered Refrigerators &amp; Freezers.</a></li> </ul> </li> <li id="cat-459"><a href="/store/solar-panel-mounts-c459/">Solar Panel Mounts.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-460"><a href="/store/solar-panel-mounts/roof-mounts-for-solar-panels-c460/">Roof Mounts for Solar Panels.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1235"><a href="/store/solar-panel-mounts/roof-mounts-for-solar-panels/flashing-for-roof-mounts-c1235/">Flashing for Roof Mounts.</a></li> <li id="cat-1157"><a href="/store/solar-panel-mounts/roof-mounts-for-solar-panels/ironridge-roof-mounts-c1157/">IronRidge Roof Mounts.</a></li> <li id="cat-684"><a href="/store/solar-panel-mounts/roof-mounts-for-solar-panels/standing-seam-metal-roof-mounts-c684/">Standing Seam (Metal) Roof Mounts.</a></li> </ul> </li> <li id="cat-1164"><a href="/store/solar-panel-mounts/ground-mounts-for-solar-panels-c1164/">Ground Mounts for Solar Panels.</a></li> <li id="cat-652"><a href="/store/solar-panel-mounts/side-of-pole-solar-panel-mounts-c652/">Side of Pole Solar Panel Mounts.</a></li> <li id="cat-514"><a href="/store/solar-panel-mounts/top-of-pole-solar-panel-mounts-c514/">Top of Pole Solar Panel Mounts.</a></li> <li id="cat-647"><a href="/store/solar-panel-mounts/rv-specialty-solar-panel-mounts-c647/">RV &amp; Specialty Solar Panel Mounts.</a></li> <li id="cat-1198"><a href="/store/solar-panel-mounts/large-ground-arrays-lga-c1198/">Large Ground Arrays (LGA).</a></li> <li id="cat-1200"><a href="/store/solar-panel-mounts/multi-pole-mounts-c1200/">Multi Pole Mounts.</a></li> </ul> </li> <li id="cat-489"><a href="/store/solar-water-pumps-c489/">Solar Water Pumps.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-525"><a href="/store/solar-water-pumps/submersible-solar-pumps-c525/">Submersible Solar Pumps.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-651"><a href="/store/solar-water-pumps/submersible-solar-pumps/shurflo-pumps-accessories-c651/">Shurflo Pumps &amp; Accessories.</a></li> <li id="cat-688"><a href="/store/solar-water-pumps/submersible-solar-pumps/sun-pumps-c688/">Sun Pumps.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1084"><a href="/store/solar-water-pumps/submersible-solar-pumps/sun-pumps/sun-pumps-accessories-c1084/">Sun Pumps Accessories.</a></li> </ul> </li> <li id="cat-1257"><a href="/store/solar-water-pumps/submersible-solar-pumps/sunrotor-submersible-pumps-c1257/">SunRotor Submersible Pumps.</a></li> </ul> </li> <li id="cat-533"><a href="/store/solar-water-pumps/surface-solar-pumps-c533/">Surface Solar Pumps.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-534"><a href="/store/solar-water-pumps/surface-solar-pumps/flowlight-booster-pump-c534/">Flowlight Booster Pump.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-920"><a href="/store/solar-water-pumps/surface-solar-pumps/flowlight-booster-pump/flowlight-pump-accessories-c920/">Flowlight Pump Accessories.</a></li> </ul> </li> <li id="cat-667"><a href="/store/solar-water-pumps/surface-solar-pumps/solar-force-piston-pump-c667/">Solar Force Piston Pump.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-653"><a href="/store/solar-water-pumps/surface-solar-pumps/solar-force-piston-pump/solar-force-piston-pump-accessories-c653/">Solar Force Piston Pump Accessories.</a></li> </ul> </li> <li id="cat-654"><a href="/store/solar-water-pumps/surface-solar-pumps/solar-slowpump-c654/">Solar Slowpump.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1148"><a href="/store/solar-water-pumps/surface-solar-pumps/solar-slowpump/solar-slowpump-accessories-c1148/">Solar Slowpump Accessories.</a></li> </ul> </li> <li id="cat-666"><a href="/store/solar-water-pumps/surface-solar-pumps/solaram-c666/">Solaram.</a></li> <li id="cat-687"><a href="/store/solar-water-pumps/surface-solar-pumps/suncentric-centrifugal-pump-c687/">Suncentric Centrifugal Pump.</a></li> <li id="cat-648"><a href="/store/solar-water-pumps/surface-solar-pumps/shurflo-surface-pumps-c648/">Shurflo Surface Pumps.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1085"><a href="/store/solar-water-pumps/surface-solar-pumps/shurflo-surface-pumps/accessories-for-shurflo-pumps-c1085/">Accessories for Shurflo Pumps.</a></li> </ul> </li> </ul> </li> <li id="cat-581"><a href="/store/solar-water-pumps/linear-current-boosters-for-solar-pumps-c581/">Linear Current Boosters for Solar Pumps.</a></li> <li id="cat-728"><a href="/store/solar-water-pumps/pump-accessories-c728/">Pump Accessories.</a><span class="more"><i class="fa Xfa-chevron-right fa-plus open"></i><i class="fa Xfa-chevron-down fa-minus close"></i></span></li> <li class="menu-tree"> <ul> <li id="cat-1049"><a href="/store/solar-water-pumps/pump-accessories/foot-valves-filters-strainers-c1049/">Foot Valves, Filters &amp; Strainers.</a></li> <li id="cat-1050"><a href="/store/solar-water-pumps/pump-accessories/general-pump-accessories-c1050/">General Pump Accessories.</a></li> <li id="cat-1046"><a href="/store/solar-water-pumps/pump-accessories/pump-controllers-c1046/">Pump Controllers.</a></li> <li id="cat-1047"><a href="/store/solar-water-pumps/pump-accessories/submersible-wire-c1047/">Submersible Wire.</a></li> <li id="cat-1048"><a href="/store/solar-water-pumps/pump-accessories/switches-dry-run-float-etc-c1048/">Switches (Dry Run, Float, etc.).</a></li> </ul> </li> </ul> </li> <li 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Find all the resources you need here.</span></a></div> <ul class="tierB"> <li><a href="/howto/">Library</a></li> <li><a href="/store/books-educational-videos/educational-videos-webinars-c1138/">Webinars</a></li> <li><a href="/video/">Video Tips</a></li> </ul> <div class="ablock"><a href="/blog/"><span class="h3">Blog</span><br /><br /> <span class="summary"> Tips, trends, ideas, latest news and more. Everything you need to make renewable do-able!</span></a></div> <div class="ablock"><a href="/XX/solar-showcase/"><span class="h3">Showcase</span><br /><br /> <span class="summary"> Share your renewable energy project with the entire altE community. </span></a></div> </div> </div> </div> <div id="halfPanel"> <div id="messages" class="oscarcss"></div> <a href="/share/">Community</a> / <div id="content_inner"><script type="text/psajs" orig_index="9">(function(){window.pagespeed=window.pagespeed||{};var b=window.pagespeed;function c(){}c.prototype.a=function(){var a=document.getElementsByTagName("pagespeed_iframe");if(0<a.length){for(var a=a[0],f=document.createElement("iframe"),d=0,e=a.attributes,g=e.length;d<g;++d)f.setAttribute(e[d].name,e[d].value);a.parentNode.replaceChild(f,a)}};c.prototype.convertToIframe=c.prototype.a;b.b=function(){b.deferIframe=new c};b.deferIframeInit=b.b;})(); pagespeed.deferIframeInit();</script><pagespeed_iframe width="280" height="157" src="https://www.youtube.com/embed/rid7Jb4fj_o" frameborder="0" align="right" style="position: relative; padding: 10px;" allowfullscreen=""><script data-pagespeed-orig-type="text/javascript" type="text/psajs" orig_index="10"> pagespeed.deferIframe.convertToIframe();</script></pagespeed_iframe> <p>The altE Off-Grid Solar Panel System Calculator helps you size the battery bank, watts of solar panels and the solar charge controller you need. The calculator assumes you will need to size your system to get you through average amount of sun-light in the <u>least sunniest month of the year</u> for your location. You still may want to consider a backup generator, however. Feel free to call our knowledgeable technical sales staff toll free at <strong> </strong> and have them help you find the system that fits your needs.</p> <div class="box" style="margin-left:2em"> <h3>Your Information</h3> <h4>Used if you optionally choose to save your calculator for later use</h4> <table class="normal transparent"> <tr> <td>Name <div class="fieldWrapper"><input id="id_name" name="name" size="20" type="text" /></div> </td> </tr> <tr> <td>Date <div class="fieldWrapper"><input id="id_date" name="date" size="20" type="text" value="2018-06-23" /></div> </td> </tr> </table> </div> <br /> <h2>Battery Bank Sizing</h2> <div style="padding-left:2em">This calculator will help you size the battery bank for your system. <div class="halfspace"></div> <div class="box"> <h3>Step 1:</h3> <h4>Your Daily Energy Usage</h4> <br /> Watt Hours per Day: <input id="id_watt_hours_per_day" name="watt_hours_per_day" onchange="doMath();" size="20" type="text" /> <p style="padding-left:2em;margin-top:1em;"><em><img src="https://www.altestore.com/store/multimedia/images/power_usage_bill.png" alt="Kilowatt Hours Usage" width="124" height="100" hspace="5" align="right" />This value is usually printed on your electric bill. Take your monthly kilowatt-hour usage from your electric bill and divide it by 30 to get your daily kilowatt-hour usage. Since it's in kilowatt (1000's of watts) you'll need to multiply that number by 1000 to get the number into watt-hours. </em><em>If you don't have a bill, or don't know your consumption, please use our <a href="/store/calculators/load_calculator/" target="_blank" rel="noopener noreferrer">Load Calculator</a> to go through the steps to determine this value. </em></p> <p style="padding-left:2em;margin-top:1em;"><em>Is your energy usage too high? </em><em>Don't despair, our knowledgeable sales folks can help you find other potential solutions. Please call us toll free at: <strong> </strong>.</em></p> </div> <div class="box"> <h3>Step 2:</h3> <h4>How Many Days Should Your System Run without Sun?</h4> <p>How many days of backup power do you want in case of cloudy/rainy days?<br />(when your solar panels will produce little energy)</p> <input id="id_days_of_backup_power" name="days_of_backup_power" onchange="doMath();" size="5" type="text" /></div> <div class="box"> <h3>Step 3: <img src="/store/multimedia/images/cold_batteries_alte.png" alt="Cold Batteries altE" width="103" height="110" hspace="5" align="right" title="Cold Batteries altE" /></h3> <h4>Adjust the Effective Capacity of Your Battery Bank Due to Low Temperatures</h4> <p>What is the lowest temperature your battery bank will experience?</p> <div class="fieldWrapper"> <select id="id_off_lowest_batt_temp" name="off_lowest_batt_temp" onchange="doMath();"> <option value="1.1">80F (27C)</option> <option value="1.04">70F (21C)</option> <option value="1.11">60F (16C)</option> <option value="1.19">50F (10C)</option> <option value="1.3">40F (4C)</option> <option value="1.4">30F (-1C)</option> <option value="1.59">20F (-7C)</option> </select> Degrees</div> </div> <div class="box"> <h3>Results:</h3> <div id="battOut1" style="margin:1em;"></div> Select a battery bank voltage <select id="id_off_batt_bank_voltage" name="off_batt_bank_voltage" onchange="doMath();"> <option value="12">12</option> <option value="24">24</option> <option value="48">48</option> </select> <div class="clearer"></div> <div style="margin:1em;"> <div class="info" id="battOut2"></div> </div> <div class="halfspace"></div> <font class="ee107"><em>Note: All calculations assume only a 50% discharge to your batteries to optimize battery life.</em></font> <div class="halfspace"></div> <div class="box" style="margin-left:2em"> <p></p> <em><a href="/store/Deep-Cycle-Batteries/" target="_blank" rel="noopener noreferrer"><img src="/store/multimedia/images/deep_cycle_batteries_alte.png" alt="Deep Cycle Batteries from altE" width="49" height="50" border="0" align="right" /><img src="/store/multimedia/images/green_alte_cart.png" width="50" height="40" hspace="5" border="0" align="middle" /></a>Select the <a href="/store/Deep-Cycle-Batteries/">deep cycle battery</a> that fits your needs</em></div> </div> </div> <div class="space"></div> <h2>Solar Panel and Solar Charge Controller Sizing</h2> <div style="padding-left:2em">This calculator helps you size the solar panel(s) and charge controller(s) needed for your system. <div class="halfspace"></div> <div class="box"> <h3>Step 1:</h3> <h4>Determine the Solar Exposure for Your Site</h4> <p>You need to determine the average number of sun-hours per day during the <u>least sunniest</u> month of the year (not the whole year).</p> <div class="box" style="margin-left:2em"> <p>Select the State-City Closest to your location (currently only US states are provided)</p> <select id="id_og_loc_select" name="og_loc_select" onchange="document.getElementById('id_og_loc_avg_sun_hrs').value=this.value; doMath(); return false;"> <option value="0.3">AK - Fairbanks</option> <option value="0.8">AK - Yakutat</option> <option value="3.7">AL - Montgomery</option> <option value="3.7">AR - Fort Smith</option> <option value="3.5">AR - Little Rock</option> <option value="5.1">AZ - Tucson</option> <option value="4.9">AZ - Prescott</option> <option value="4.9">AZ - Phoenix</option> <option value="4.5">CA - Santa Maria</option> <option value="3.4">CA - San Francisco</option> <option value="3.2">CA - Bakersfield</option> <option value="2.8">CA - Fresno</option> <option value="4.2">CA - Los Angeles</option> <option value="5.2">CA - Daggett</option> <option value="4.2">CA - Long Beach</option> <option value="2.8">CA - Arcata</option> <option value="3.9">CO - Eagle</option> <option value="4.6">CO - Pueblo</option> <option value="4.1">CO - Grand Junction</option> <option value="4.2">CO - Boulder</option> <option value="2.8">CT - Bridgeport</option> <option value="2.7">CT - Hartford</option> <option value="3">DE - Wilmington</option> <option value="3.1">DC - Washington</option> <option value="3.9">FL - Jacksonville</option> <option value="4.7">FL - Key West</option> <option value="4.5">FL - Miami</option> <option value="4">FL - Tallahassee</option> <option value="4.4">FL - Tampa</option> <option value="3.7">GA - Atlanta</option> <option value="3.9">GA - Savannah</option> <option value="4.8">HI - Honolulu</option> <option value="3">IA - Des Moines</option> <option value="2.6">ID - Boise</option> <option value="2.8">IA - Waterloo</option> <option value="2.4">IL - Chicago</option> <option value="2.6">IN - Indianapolis</option> <option value="3.4">KS - Topeka</option> <option value="4.2">KS - Dodge City</option> <option value="2.7">KY - Lexington</option> <option value="3.7">LA - Lake Charles</option> <option value="3.7">LA - New Orleans</option> <option value="3.7">LA - Shreveport</option> <option value="2.8">MA - Worcester</option> <option value="2.9">MA - Boston</option> <option value="3.1">MD - Baltimore</option> <option value="2.5">ME - Caribou</option> <option value="3">ME - Portland</option> <option value="2.2">MI - Saulte Ste. Marie</option> <option value="2">MI - Lansing</option> <option value="2.6">MN - St. Cloud</option> <option value="3.2">MO - Columbia</option> <option value="3.1">MO - St. Louis</option> <option value="3.5">MS - Meridian</option> <option value="2.6">MT - Glasgow</option> <option value="2.7">MT - Great Falls</option> <option value="3">MT - Miles City</option> <option value="3.6">NC - Charlotte</option> <option value="3.6">NC - Cape Hatteras</option> <option value="3.6">NC - Greensboro</option> <option value="3">ND - Bismarck</option> <option value="3.2">NE - Omaha</option> <option value="2.8">NJ - Newark</option> <option value="5">NM - Albuquerque</option> <option value="4.9">NV - Las Vegas</option> <option value="4.3">NV - Ely</option> <option value="2.1">NY - Binghamton</option> <option value="1.9">NY - Buffalo</option> <option value="2.4">NY - Albany</option> <option value="2">NY - Syracuse</option> <option value="2.8">NY - New York City</option> <option value="2.2">OH - Columbus</option> <option value="1.9">OH - Cleveland</option> <option value="3.7">OK - Tulsa</option> <option value="4.1">OK - Oklahoma City</option> <option value="1.7">OR - Astoria</option> <option value="1.6">OR - Portland</option> <option value="1.9">OR - Medford</option> <option value="2.1">PA - Pittsburgh</option> <option value="1.8">PA - Erie</option> <option value="4.8">PR - San Juan</option> <option value="2.9">RI - Providence</option> <option value="3.9">SC - Charleston</option> <option value="3.4">SD - Rapid City</option> <option value="3.1">TN - Nashville</option> <option value="3.4">TN - Memphis</option> <option value="4.1">TX - San Antonio</option> <option value="3.6">TX - Brownsville</option> <option value="5.1">TX - El Paso</option> <option value="4.1">TX - Waco</option> <option value="4.1">TX - Fort Worth</option> <option value="2.9">UT - Salt Lake City</option> <option value="4.4">UT - Cedar City</option> <option value="3.3">VA - Richmond</option> <option value="2.1">VT - Burlington</option> <option value="1.4">WA - Seattle</option> <option value="1.3">WA - Olympia</option> <option value="2.6">WI - Green Bay</option> <option value="2.6">WI - Madison</option> <option value="2.6">WV - Charleston</option> <option value="4">WY - Lander</option> </select> <p><b>or</b> <br /> <a href="/howto/Tools-Calculators-Reference/Reference-Materials/Solar-Insolation-Map-World/a43/" target="_blank" rel="noopener noreferrer"><img src="/store/multimedia/images/world_solar_insolation_map_alte.png" alt="world solar insolation map" width="136" height="75" hspace="5" border="0" align="right" /></a>Manually enter the average sun-hours for your location.<br /> <input id="id_og_loc_avg_sun_hrs" name="og_loc_avg_sun_hrs" onchange="doMath();" size="5" type="text" /></p> </div> </div> <div class="box"> <h3>Step 2:</h3> <h4>Sizing Your Solar Panel Power Needed</h4> <p>The total wattage of Solar Panels that you need is:</p> <input id="id_og_min_watts" name="og_min_watts" onchange="doMath();" readonly="readonly" size="20" type="text" /> <strong>Watts, or</strong> <input id="id_og_min_kwatts" name="og_min_kwatts" onchange="doMath();" readonly="readonly" size="20" type="text" /> <strong>kilowatts</strong> <br /><br /> This value takes into account losses due to system inefficiencies.</div> <div class="box"> <h3>Step 3:</h3> <h4><em></em>Determine How Many Solar Panels You Need in Your Array</h4> <p><em></em>How many solar panels do you need? That depends on the panel you choose.</p> <p>Select the wattage of the panel your interested in, and see the results below:</p> <p> <select id="id_og_sp_wattage_select" name="og_sp_wattage_select" onchange="doMath();"> <option value="5">5</option> <option value="10">10</option> <option value="20">20</option> <option value="40">40</option> <option value="50">50</option> <option value="60">60</option> <option value="65">65</option> <option value="70">70</option> <option value="75">75</option> <option value="80">80</option> <option value="85">85</option> <option value="90">90</option> <option value="100">100</option> <option value="110">110</option> <option value="120">120</option> <option value="130">130</option> <option value="135">135</option> <option value="140">140</option> <option value="145">145</option> <option value="150">150</option> <option value="155">155</option> <option value="165">165</option> <option value="170">170</option> <option value="175">175</option> <option value="180">180</option> <option value="185">185</option> <option value="190">190</option> <option value="195">195</option> <option value="200">200</option> <option value="205">205</option> <option value="210">210</option> <option value="215">215</option> <option value="224">224</option> <option value="225">225</option> <option value="235">235</option> <option value="239">239</option> <option value="240">240</option> <option value="245">245</option> <option value="250">250</option> <option value="255">255</option> <option value="260">260</option> <option value="265">265</option> <option value="270">270</option> <option value="275">275</option> <option value="280">280</option> <option value="285">285</option> <option value="290">290</option> <option value="295">295</option> <option value="300">300</option> <option value="310">310</option> <option value="315">315</option> <option value="320">320</option> <option value="325">325</option> <option value="330">330</option> <option value="335">335</option> <option value="340">340</option> <option value="345">345</option> <option value="350">350</option> <option value="355">355</option> <option value="360">360</option> </select> watts per panel.</p> <p>You will need <input id="id_og_total_panels" name="og_total_panels" onchange="doMath();" readonly="readonly" size="10" type="text" /> panels for a total of <input id="id_og_total_watts" name="og_total_watts" onchange="doMath();" readonly="readonly" size="10" type="text" /> watts.</p> <div class="box" style="margin-left:2em"> <p><em><a href="/store/Solar-Panels/c541/" target="_blank" rel="noopener noreferrer"><img src="https://www.altestore.com/store/multimedia/images/solar_panel_sizing_alte.png" alt="how to size solar panels " hspace="5" vspace="5" border="0" align="right" /><img src="https://www.altestore.com/store/multimedia/images/green_alte_cart.png" width="50" height="40" hspace="5" border="0" align="middle" /></a>Select the <a href="/store/Solar-Panels/c541/">solar panel</a> that fits your needs.</em></p> </div> <h3> </h3> <h4><em></em>Sizing your Solar Charge Controller</h4> <p>You will need a charge controller that can handle: <input id="id_og_inverter_watts" name="og_inverter_watts" onchange="doMath();" readonly="readonly" size="10" type="text" /> amps</p> <div class="box" style="margin-left:2em"> <p align="left"><em> <a href="/store/Charge-Controllers/Solar-Charge-Controllers/c892/" target="_blank" rel="noopener noreferrer"> <img src="https://www.altestore.com/store/multimedia/images/sizing_solar_charge_controller_alte.png" alt="Sizing Solar Charge Controller" border="0" align="right" /><img src="https://www.altestore.com/store/multimedia/images/green_alte_cart.png" width="50" height="40" hspace="5" border="0" align="middle" /></a>Select the <a href="/store/Charge-Controllers/Solar-Charge-Controllers/c892/" target="_blank" rel="noopener noreferrer">solar charge controller</a> that fits your needs</em></p> </div> <p>Sizing a charge controller can be complex, the above answer is a conservative estimate. 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