Posted by David, Surrey UK on August 26, 2007 at 09:04:38 from (84.9.75.186):
In Reply to: 8N -8 volt posted by vkjxv on August 24, 2007 at 13:35:34:
IaGary said: (quoted from post at 04:47:47 08/25/07)Most generators and alt. put out more than 6 volts just as a 12 puts out 14.5 or more.
Nominal voltage for lead-acid batteries is 2.0 volts per cell, but the fully charged float voltage is about 2.4 volts per cell. So to charge a 4-cell battery to 100% you'll need 9.6 volts (as Bob says).
The exception to this 2V rule is 28 volt batteries, as used on military and some other vehicles. This 28V is actually the float voltage, not the discharge voltage. They're only 12 cells (e.g. two 12 volt batteries in series), so they should really be called 24V batteries. (Alternatively, car batteries should be called 14V batteries!)
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