Off Grid Store

Battery Size Information

Lead Acid Sizing

10kWh x 2 (for 50% depth of discharge) x 1.2 (inefficiency factor) = 24 kWh Lithium Sizing

10kWh x 1.2 (for 80% depth of discharge) x 1.05 (inefficiency factor) = 12.6 kWh

Battery capacity is specified either in kilowatt hours, or amp hours.

For example, 24 kWh = 500 amp hours at 48 volts → 500 Ah x 48V = 24 kWh

Battery banks are typically wired for either 12 volts, 24 volts or 48 volts depending on the size of the system

Examples for Lead Acid and Lithium:

For Lead Acid, 24kWh is equal to:

2,000 amp hours at 12 volts

1,000 amp hours at 24 volts

500 amp hours at 48 volts

For Lithium, 12.6 kWh is equal to:

1,050 amp hours at 12 volts

525 amp hours at 24 volts

262.5 amp hours at 48 volts

Helpful Tips and Advice

Plan the wiring run in advance so the wires don’t interfere with access to the array.

Use wire clips to secure the factory wire leads in place so they don’t move in the wind or touch the roof Wire clips allow you to run the wires along the rails or the frame of the solar panel.

Many solar components use spring clamps, which require you to push down on a metal bar (or another mechanism) to open the terminal so you can seat the wire. Once the wire is firmly seated, release the spring, which clamps the wire in place.