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Home > News & Events >News The Battery Charging Information in the Operation of Solar System

The main function of MPPT solar controller is adjust and charge for battery. other part include solar panel and power is service for battery. hence, battery is the most important and expensive parts in the whole system. so we only can choose good quality charge controller suppliers then can support good protection for our battery. now, let's learn some knowledge about solar controller operation in the solar system.

The charge controller starts a new charge cycle every morning, when the sun starts shining.

The maximum duration of the absorption period is determined by the battery voltage measured just before the solar charger starts up in the morning.

Battery voltage Vb (@start - up)

Maximum absorption time

Vb < 23.8V

6h

23.8V <Vb <24.4V

4h

24.4V <Vb <25.2V

2h

Vb ﹥25.2V

1h

 (divide voltage by 2 for a 12 V system)

If the absorption period is interrupted due to a cloud or due to a power hungry load, the absorption process will resume when absorption voltage is reached again later on the day, until the absorption period has completed.

40A MPPT Solar charge controller SMP series

The absorption period also ends when the output current of the solar charger drops to less than 2 Amps, not because of low solar array output but because the battery is fully charged (tail current cut off).

This algorithm prevents over change of the battery due to daily absorption charging when the system operates without load or with a small load.