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Old 06-02-2012, 08:39 PM   #1
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Low house batteries

After a 5 hr. trip the MH sat for 3 days in which the lights were on
for short intervals.

The Aux. disconnect didn't work because the bat. voltage dropped to 10.

I wonder what took the2 house bat. down so quick. After an hour on shore power, the aux. switch worked and now the 2 batteries. read 12 volts.

The interstate batterie dates weren't pricked out on date tab and no date codes on sides of batt.

Now I don't know how old they are. Don't know if bar code will give date.

Thanks in advance.
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Old 06-02-2012, 08:55 PM   #2
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I leave my coach plugged in at home to 110 to keep converter charging the batteries. The Aux switch is never off.
The alternator should charge the house batteries once the chassis battery is charged.
Not knowing age of batteries I'D put a battery charger on them and bring up to full charge.
You control boards will draw off the batteries possible the LP Detector while just sitting.
If after charging and they drop I would replace them.
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Old 06-03-2012, 09:49 PM   #3
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Another suggestion. After you charge the batterie's test them with a battery tester that measures the gravity of the electrolyte or battery acid as some refer to it.

One like this.

If after a good charge the needle doesn't move to the high end of the scale the battery has most likely become sulfated. The sulfate deposit's occur when the battery looses it charge and sits. It looks like white deposits on the plates in th battery.
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Old 06-04-2012, 11:39 AM   #4
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My old '94 rig takes 3 days to draw down the house batteries too. And I have to run the genset a few hours or move to a RV park to plug in when that happens. I think you're setup is probably behaving normally.

But you should service the batteries, charge them up, and take them to a battery shop for a load test to get an idea of condition. JMO.
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Old 06-04-2012, 11:52 AM   #5
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Quote:
Originally Posted by frederick w View Post
After a 5 hr. trip the MH sat for 3 days in which the lights were on
for short intervals.

The Aux. disconnect didn't work because the bat. voltage dropped to 10.

I wonder what took the2 house bat. down so quick. After an hour on shore power, the aux. switch worked and now the 2 batteries. read 12 volts.

The interstate batterie dates weren't pricked out on date tab and no date codes on sides of batt.

Now I don't know how old they are. Don't know if bar code will give date.

Thanks in advance.
If the batteries have gone below 11.3 volts. it's likely they will never return to a full state of charge. 10.5 volts is considered 0% of charge or completely dead.
Deep Cycle Battery FAQ Voltages

As mentioned earlier they may just be too old to take a charge, the solenoid that switches on with the ignition may be faulty and they dont charge from the engine alternator, or the house charger isn't recharging them from shore power.

You can check the solenoid by disconnecting from shore power and starting the engine. Go to the energy management center and check both the house and chassis batteries. If the chassis battery shows 13.4 - 14.5 volts the engine alternator is working. If the house batteries don't show similar voltage the transfer solenoid is bad.

With the engine off and connected to shore power you should see around 13.7 volts on the house batteries. If you see 12 volts or less you have a problem with either the transfer switch or the house baytery charger.
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