Estimate solar battery capacity, usable kWh, battery count, backup runtime, charging time, inverter load, depth of discharge, battery cost, and backup coverage. This calculator is useful for solar storage, home backup, RV systems, cabins, and off-grid planning.
Battery capacity:
The calculator multiplies battery kWh by battery count, then applies depth of discharge and inverter efficiency.
Backup runtime:
Usable kWh is divided by the backup load to estimate how many hours the battery can run.
Charging time:
Solar charging is estimated from solar array kW, peak sun hours, and charge efficiency.
A solar battery calculator helps estimate how much battery storage is needed for backup power, solar self-consumption, RV power, cabins, or off-grid systems.
It can help with home backup loads, fridge backup, lighting, outlets, internet equipment, sump pumps, RV systems, cabins, and solar charging plans.
Your result shows total battery capacity, usable battery capacity, backup runtime, required battery size, batteries needed, solar charge time, load coverage, amp-hours, total cost, estimated value per cycle, and detailed backup load totals.
Multiply the load in kW by the backup hours needed, then adjust for depth of discharge, inverter efficiency, and reserve capacity.
Usable battery capacity is the energy available after accounting for depth of discharge and inverter losses. It is usually less than the nameplate battery capacity.
Divide usable battery kWh by your average load in kW. A 10 kWh usable battery can run a 1 kW load for about 10 hours.
No. This calculator gives a planning estimate. Final battery systems should account for inverter limits, surge loads, code requirements, battery chemistry, temperature, ventilation, disconnects, overcurrent protection, manufacturer instructions, and local inspection rules.