Battery runtime
Enter the battery and load specs. Results update live.
Estimated runtime
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Enter the battery and load to see the runtime.
Estimate battery runtime in hours from capacity, voltage, load and depth of discharge, for 12V, 24V and 48V systems.
Enter the battery and load specs. Results update live.
Enter the battery and load to see the runtime.
Capacity in amp hours times voltage gives watt hours of stored energy. Multiplying by the usable depth of discharge and an 85 percent inverter efficiency gives the energy you can actually draw, and dividing by the load in watts gives the runtime in hours.
Lead acid batteries last longest when discharged only 50 percent, while lithium iron phosphate (LiFePO4) safely uses 80 percent. Draining any battery to zero regularly shortens its life, so the calculator defaults to chemistry safe values.