Battery Bank Sizing Calculator
Calculate the right battery capacity for your energy needs
Total watt-hours consumed per day
2 days
Days to run without solar/charging
Results
Minimum Capacity
209Ah
At system voltage
Suggested Size
280Ah
Common battery size
Total Energy Storage
3,360Wh
Usable Energy
2,688Wh
At 80% depth of discharge
How to Size Your Battery Bank
Proper battery sizing ensures you have enough power during cloudy days or high-use periods. The key factors are daily energy consumption and desired days of autonomy.
Days of autonomy is how long you want to run without any solar charging. For off-grid homes, 2-3 days is common. For RVs, 1-2 days may suffice.