The maximum power of your battery in a hybrid power system will be limited by the inverter or by the battery itself. This information is found in the specifications of each.

For example, the maximum battery charge and discharge current might be 20 Amps.

To establish the maximum power output of the battery we can use this formula:

Power (Watts) = Voltage (Volts) x Current (Amps)

If the battery current is limited, the battery voltage is very important.

In a stack type battery, made up of modules, the battery modules might be 102V DC each.

A 4-module stack (4 x 102V = 408V), the maximum load can be expressed as P= 408 x 20 = 8,160Wmax.

Whereas a 6-module (612V) stack can produce 12,240Wmax.

The battery voltage reduces marginally during discharge, so these values are nominal. In operation if the desired load exceeds these values then the hybrid inverter consumes power from the grid.

In many situations, the rate the battery can deliver power is as important as  the overall capacity. This is especially true when the system is needed during a power outage.