I have a 12V battery linked to my solar panels.
In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8.
At night, battery goes down to ~13.8V. (Which I think is the voltage of the full battery) - with no added voltage from solar panels.
Is it safe ? Does it reduce battery life ? (I have a deep cycle lead battery 80Ah.)
Should I change the PWM default configuration to put 13.8V instead ? Why isn't it 13.8V by default ? Is there some advantages I don't understand when set to 14.8V ?
EDIT : I have a battery Hankook DC24MF and a cheap 15$ PWM 20A.