We cannot emphasize enough, the solar batteries have become the weakest link in renewable energy systems. They are more and more expensive and are very fragile.
Improper adjustment and they can be quickly under-charged, over-charged, they can become hot, sulfated, owidize, many things can happen to them...
It is often observed that the batteries could last longer if the load was better refulated and if they had been better chosen.
The first step is to choose either open solar batteries or sealed solar batteries.
Sealed solar batteries
There are many reasons that can cause premature battery death
The main cause of premature death of a battery being forgetting adding demineralized water, we will tend to prefer sealed batteries, called "maintenance-free" or "VRLA" for Valve Regulated Lead Acid.
But the fact that they are maintenance-free requires some special attention. Unlike open-acid batteries
The sealed solar batteries inside
ADVANTAGES of sealing solar batteries :
DISADVANTAGES of sealed solar batteries :
Open solar batteries
Open batteries, they require more maintenance and are more rustic :
Open solar batteries ADVANTAGES
Open solar batteries DISADVANTAGES
Open load solar batteries in 2 volts elements
Sealed batteries are preferred if you do not wish to maintenance or if your site is a very remote and difficult to access place. They also prefer the boats as they do not risk losing their acid.
For applications where the battery voltage undergoes large fluctuations (important cycling), as in a domestic installation, the batteries are charged the day if possible to 100% and discharged significantly night which produces a full cycle.
In this case, open lead batteries or lead-antimony batteries can be chosen in the condition that the maintenance is carried out rigorously