Good Sam Club Open Roads Forum: General RVing Issues: Batteries charging
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 > Batteries charging

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jeeperdude10

N. Georgia

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Posted: 08/26/19 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

My motorhome's battery status shows-chassis 12.4 and house 13.0. I have just replaced the chassis battery a week or so ago, is the 13 too low? Am I needing to look into replacing as well? I did have to add a bit of distilled water to them (4-6volters) a few weeks ago. The status thingy on the wall does fluctuate a bit...13.4 for house has been seen last night or night before.....when is the RED FLAG WAVE to replace house batteries? TIA


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jkwilson

Indiana

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Posted: 08/26/19 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

It depends on the particular batteries, but 13V is probably good. 13.4V was likely either from a float charger or the residual voltage from a charger.


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Sam Spade

North Central Florida

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Posted: 08/26/19 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

IF.....you are plugged into shore power OR the gen is running OR on some rigs if the engine is running.....you are NOT measuring the battery voltage but the charging voltage.
13.0 is an absolute minimum "float" voltage and actually would be a bit high if it was the battery alone.

Note: 12.4 is a bit LOW. YOu need to check that again with the engine running to be sure your alternator is working OK.


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opnspaces

San Diego Ca

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Posted: 08/26/19 04:51pm Link  |  Quote  |  Print  |  Notify Moderator

At 12.4 volts your chassis battery is low and needs a charge. At 13 volts your house batteries are fully charged.


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time2roll

Southern California

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Posted: 08/26/19 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

Are these connected and running the RV?
12.4 is the low side of normal depending on how long you have been without power. 13.0 is charged and good.

Are you plugged in and charging?
If you are plugged in and charging... both are low. Check your charging system.

Are the batteries disconnected and resting 24+ hours?
12.4 is low and needs a charge. 13.0 is full charge and may settle down to 12.8 volts.


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