I notice that several people recommend fork lift truck batteries for use in solar systems, as does my solar adviser/supplier!
I run a 24v system using 4 Rolls Surette 6v batteries wired in series together with an Outback voltage regulator. I made the decision to use Rolls batteries which I now regret.
As stated my batteries are wired in series and have all been enthusiastically maintained and topped up as necessary. They have been set up exactly as per their very detailed manual.
However, after 4 years of use, one battery remains as thought it were brand new and the other three have gone duff. Rolls agreed to replace one last year, at a slightly reduced price and so far that one is performing well. The two remaining are well down on Specific Gravity and will not budge with equalising.
I should add that we live in Spain and there is no shortage of sunshine. I have always used a generator to keep the batteries topped up when we have had a couple of dull days. Acid levels, too, have been checked and topped up with distilled water as necessary!
Rolls do not reply to my letters and my advice to anyone is DON'T BUY ROLLS if you want a guarantee and after sales service.
Bobharrow
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