Re: O.T.-----battery voltage control

Posted by Gerald J. on July 11, 2007 at 08:18:42 from (67.0.103.104):

In Reply to: O.T.-----battery voltage control posted by farmerjohninpa on July 10, 2007 at 22:13:43:

The precise cell voltage is a function of temperature and the full charge specific gravity of the electrolyte. Using a standard temperature of 68 degrees F is common. Most starting batteries use a full charge SG off 1.280, often expressed as 1280. That gets a full charge or float voltage of 2.36 volts per cell.

A deep cycle battery may use a SG of 1.260 or lower for longer life and will have a lower full charge voltage. Probably 2.30 volts per cell.

The full charge voltage is the maximum voltage that if the battery terminals are held to that voltage, the charging current will taper to zero. Any higher voltage doesn't increase the stored energy but dissociates more water that requires replacement.

I'm sure web pages from battery makers may occasionally give details of float voltages vs SG, or a vintage battery text book such as the ones by Veniot (IIRC) that might be on my library shelf but that's not handy to this computer.

Gerald J.

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