What happens when solar batteries are
charged and discharged?
When batteries are full the acid is at its strongest and at it's weakest (diluted) when
empty. Simply put the process of charging and discharging a battery involves
the transfer of sulphur from the acid solution to the plates and vice versa.
If you've heard someone say that their batteries are exhausted because
they are badly sulphated thatís when the sulphur has been on the plates for too
long. If your solar battery is frequently flat, or partially charged for extended
periods of time they get sulphated. The longer the sulphur remains on the
plates the harder it gets to remove it by charging them.
Thatís why it is vitally important that the renewable energy source (solar
panels / wind turbine) must be capable of regularly fully charging the
batteries. Similarly the loads or appliances connected must not frequently fully
empty them. Choosing the right power and type of batteries for a solar power
kit is very important. This process is often referred to as system sizing.