The charging and discharging current of a battery is an important parameter
in system design. The magnitude of the charging current is mainly determined by
the maximum charging current of the inverter itself, the power of the
photovoltaic module, and the maximum allowable charging current of the battery.
The size of the discharge current depends on the maximum discharge current of
the inverter itself, the power of the load, and the maximum discharge current
allowed by the battery.
When designing, it is necessary to calculate the charging and discharging
current of the battery based on the actual situation. For example, the charging
current can be calculated by the formula "Charging current=photovoltaic module
power * MPPT efficiency/battery voltage". Similarly, the discharge current can
also be calculated using a similar formula.
Cable design and selection
In off grid power generation systems, the cable design of the battery is
also crucial. Due to the fact that inverters usually have a certain overload
capacity, it is necessary to consider the possible maximum instantaneous power
when designing cables. The selection of cables should be based on the actual
charging and discharging currents, and the cable specifications that can
withstand the maximum current should be selected.
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