Battery readings help (1 Viewer)

[cookie]

Have just changed friends battery's for 2 x 115 ah.

Sergent control panel over door shows 13.2v. solar controller shows 13.2v. But batteries are actually both 14.2 with ny meter after driving back from the shop where I put them in.. Any ideas?

But van battery also shows on panel correctly at 12.7v.

 

[Alistair33]

Give this a little bump

I think that 14.2 is normal for lead acid batteries fully charged but I'm sure someone will be around soon with a lot more knowledge than me !

 

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Anyone ?

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[Teuchter]

A 12v lead acid battery in good condition fully charged can easily be 14.2v until some load is applied (particularly if recently charged)

 

[andy63]

Have just changed friends battery's for 2 x 115 ah.

Sergent control panel over door shows 13.2v. solar controller shows 13.2v. But batteries are actually both 14.2 with ny meter after driving back from the shop where I put them in.. Any ideas?

But van battery also shows on panel correctly at 12.7v.

the battery voltage of 14.2v will be a surface charge and will drop to around 12.7v.. that is the max voltage of a fully charged lead acid battery.. it may vary slightly depending on type .. i.e. wet , agm , gel ..not sure , but definitely not as high as 14 odd volts..
I would have expected the sargeant panel to mirror more or less the battery voltage..
someone with a sargent panel may know why there is such a difference.
andy

 

[pappajohn]

Disconnect the negative lead on each battery and check voltage across each battery in turn with a meter.
They should be between 12.7v and 13.6v depending when they came off charge. ...an hour after disconnecting they should be nearer to 12.7v.
If they are, ignore the solar and control panel voltages...they are inaccurate.
14.2v is the solar charge voltage being read, not the battery voltage.

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