Off-Grid Solar Power System Calculator
Comprehensive off-grid solar power design calculator. Computes total daily watt-hours, required solar array wattage factoring in sun hours and system losses, battery bank capacity in Amp-hours (Ah) and kWh with autonomy reserve days, and inverter sizing.
Off-Grid Solar Power System Calculator
Size solar panel arrays, battery storage banks (Ah/kWh), charge controllers, and pure sine wave inverters for cabins, RVs, and off-grid homes.
3 Panels
1200W array (400W ea.)384 Ah
@ 24V (9.2 kWh total)2500 W
Pure sine wave output1038 W
Includes 25% system lossHow Sizing Works: Solar + Battery Math
1. Array Wattage: We account for wiring resistance, charge controller conversion loss (MPPT ~98%), and panel temperature derating by adding a 25% buffer.
2. Battery Chemistry: Lithium LiFePO4 batteries can safely be discharged to 80-90% without degrading lifespan, whereas lead-acid or AGM batteries should never be discharged past 50%.
How to Use Off-Grid Solar Power System Calculator
Input Daily Watt-Hours
Specify your daily household energy consumption in Wh or kWh.
Select Voltage & Chemistry
Choose 12V, 24V, or 48V system voltage and Lithium or Lead-Acid batteries.
View Complete System Specs
Inspect panel count, battery bank Ah, and recommended inverter wattage.
Frequently Asked Questions
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