solar tool
Solar Battery Size Calculator
Estimate battery capacity for a daily or backup energy requirement.
This estimates nominal battery capacity. Actual usable capacity depends on battery specifications, temperature, age, and operating conditions.
Required battery capacity
138.89 Ah
Ah = required Wh ÷ (V × DoD fraction × efficiency fraction).
Important assumptions
This is a planning estimate, not a guarantee of performance. Real equipment varies with temperature, age, power quality, duty cycle, wiring, and manufacturer specifications.