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All good thoughts below...
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Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Wed, 2 Apr 2014 09:06:52 Share Post by Email
In Reply to: Battery volts while running, vs hrs of sitting off., BOB Palendrome, Tue, 1 Apr 2014 19:11:58
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But to calibrate your thinking...

12.6 volts is the open circuit voltage of a fully charged battery. Any higher voltage will charge a battery, if ever so slowly due to the exact voltage and wire resistance. A fully charged battery will not accept current below something like 16 volts - higher voltages will break down the water in the cells into hydrogen and oxygen gas.

Bosch voltage regulators are temperature sensitive - the higher the temperature, the lower the voltage setting. This is to prevent excess electrolyte loss. That's why the voltage might typically start at 14.5 volts first thing in the morning and then gradually decrease to 14.0 or 13.8.

Back in the day, C900 and 9000 regulators would actually drop to 12.6 volts during normal operation in hot climates. There was a cottage industry of replacing the in-alternator regulators with simple brush packs connected to external regulators that lived up on the firewall. I think the regulator of choice back then was a Ford part that was used on cars with electrically heated windshields.

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