Log in
Article search:

Q & A

Batteries - 6 Volt or 12 Volt?

I am looking into replacing my battery bank of 4 x 135 AH lead acid batteries. Someone has recommended that 6 volt batteries provide better performance and have a longer life. Are two pairs of 6 volt batteries in series, connected together in parallel a better bet than four 12 volt batteries in parallel? The boat has Sterling charge controllers for both shore power and alternators.

Asked by: Colin Wilks  | 7.09am, Tuesday 23 March

WW says:

A pair of 6-volt batteries connected in series should give approximately the same performance as a single 12-volt battery of the same type.
I suspect that the confusion has occurred because traction batteries are usually supplied in 6-volt units.
Traction batteries are used in golf buggies and milk floats and can withstand may more charge/discharge cycles than lead acid ones.
The only drawback is that they are also a lot more expensive, although, depending on the situation, they can work out cheaper in the long run.

Graham Booth  | 11.22AM, Tuesday 23 March

You must log in to post an answer.