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pushtoy 2

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Posted: 06/30/19 08:43am Link  |  Quote  |  Print  |  Notify Moderator

what is the voltage on a fully charged 12v battery


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IAMICHABOD

Sunny So Cal 90713

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Posted: 06/30/19 09:10am Link  |  Quote  |  Print  |  Notify Moderator

This Chart will help


[image]


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bobndot

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Posted: 06/30/19 09:26am Link  |  Quote  |  Print  |  Notify Moderator

That's the resting voltage with zero draw.

Bordercollie

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Posted: 06/30/19 09:42am Link  |  Quote  |  Print  |  Notify Moderator

CORRECTIONS/CLARIFICATIONs: A fully charged battery should read around 13.6 volts when being charged by the converter/charger. When at rest for some time ,with no loads, at may read around 12.6 volts . With engine running, should read around 14 volts. Tip: Make sure that the aux ( house) battery switch is in "on" position so that converter is charging your house battery(s). In the "off" position, you will read around 13 volts, in the "on" position you should read around 14 volts. You will need to leave the aux/house battery switch in "off" position to keep alarms, etc. from slowly draining your house battery when parked/un-driven and not connected to 110volt "shore power" for extended periods of time. Running the generator charges house batteries slowly. Keep checking electrolyte levels and add distilled water to keep levels above plates. Low levels will shorten useful house battery life which is around 4 years(!) with proper charging and maintenance. Good fully charged house batteries should, in theory, provide power for lights. etc. for up to 3 day/night camping. Furnace blowers can nearly drain house batteries in one night. A day's driving should fully recharge house batteries from the truck's alternator. The converter charger takes longer than truck's alternator to recharge house batteries when connected to shore power or running the generator. Basic RV house battery systems are the "weak link" in RV camping and need regular attention including cleaning of terminal connections. (Sorry if I confused anybody.)

* This post was last edited 06/30/19 08:53pm by Bordercollie *   View edit history

pushtoy 2

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Posted: 06/30/19 10:31am Link  |  Quote  |  Print  |  Notify Moderator

thanks for the response good info

time2roll

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Posted: 06/30/19 10:43am Link  |  Quote  |  Print  |  Notify Moderator

The 12 Volt Side of Life


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Bordercollie

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Posted: 06/30/19 10:48am Link  |  Quote  |  Print  |  Notify Moderator

Forgot to mention, try to never run your house batteries down to 12 volts which is "dead". This damages battery innards and shortens useful life severely. A newish healthy battery should be fully charged but not over-charged for adequate performance and useful life. Camping while connected to shore power is best with a standard house battery system. BTW, many/most RV's do not have provision to charge the engine starting battery while connected to shore power. I added a Trik-L-Start device which routes some of the charging current from the converter charger to the engine starting battery. A simple battery maintainer/trickle charger may be used to charge the starting battery if 110vac power is available.

Sam Spade

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Posted: 06/30/19 11:58am Link  |  Quote  |  Print  |  Notify Moderator

Bordercollie wrote:

Also, with battery not being charged, a fully charged battery should read around 13.6 volts.


Others will NOT benefit from incorrect information.
The above is just simply wrong.

A conventional wet cell battery is fully charged if it has a resting voltage of 12.6. An AGM is 12.8; some 12.9.


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Sam Spade

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Posted: 06/30/19 12:02pm Link  |  Quote  |  Print  |  Notify Moderator

Bordercollie wrote:

Forgot to mention, try to never run your house batteries down to 12 volts which is "dead".


MORE wrong information.
12.0 volts is about 75% discharged.....which is not "dead".

Deep cycle batteries especially won't be phased by that IF they are charged back up soon.

pianotuna

Regina, SK, Canada

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Posted: 06/30/19 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

Approximately 12.65 volts resting voltage, but that depends on the particular 12 volt "chemistry" being used.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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