# Battery question

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Solar Expert Posts: 34 ✭✭
To the Mods or anyone who can help, BB I have spokewith you before, I need help with my old surrettes I was going to try to save the good ones, But I don't even know how many volts they are My late husband would know that.

So I had a total of 16 batteries and we had them hooked up for 48volts, I always thought that they were 2 volts each but the math isn't right then, they have been sitting for 2 months and they read 5.99 average so are they 6 volt batteries?? the have 3 places on top to fill with water. Can anyone help?

Thankyou in advance as you can tell I am not very technical

Soalrgirl

• Solar Expert Posts: 300 ✭✭✭
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Re: Battery question

They are definitely 6V batteries. Every PbA cell is 2V, so with 3/battery that is 6V. The math does work out. To get 48V you would need 8 batteries of 6V. Since you have 16 batteries, that is two batteries in parallel, then the groups of two wired in series.
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Re: Battery question

In general, each cell has one filling cap. Each cell is around 2.0 volts,

Three cells in series == 2 volts * 3 cells = 6 volts per battery.

48 volt bank / 6 volts per battery = 8x "6 volt" batteries per series string.

-Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
• Solar Expert Posts: 34 ✭✭
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Re: Battery question

Thanks guys I am having the workers load up batteries but I wanted to save any good one to make a 12 volt system ..
THANKYOU