Backup time, water top-ups, charging and battery life.
4 guides
Topping up every few weeks means something is wrong. The usual causes are charge voltage set too high, heat, or too much charge current — with the numbers to check each one.
It turns on one number: how often you deep-discharge. Cycle life, usable capacity and charge behaviour compared, plus the compatibility checks that catch people out.
Usually it is not the battery. Standby draw, always-on devices and a bank that never finished charging account for most of it — with the numbers to check each.
About ten hours for a 150 Ah battery from half empty on a 10 A charger — and the last fifth takes the longest. Why 'full' on the display often is not, and what to check.
