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Topic: House batteries low after hours on the Genset (Read 356 times) previous topic - next topic

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  • bigdog
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House batteries low after hours on the Genset
Getting ready to head up to Joseph, Oregon in a week. So got the coach out and parked at the house. It was just a bit slow to crank over. Let it high idle till air built up and drove across town to fuel up. Got back to the house and started the...

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Re: House batteries low after hours on the Genset
Reply #1
Sorry dead.  Some or all. Or bad cabling

Re: House batteries low after hours on the Genset
Reply #2
Be aware that smart charger will often NOT charge extremely deeply discharged/dead batteries.

You may need an old fashion "stupid" charger to get the process started.

I am a little surprised that the alternator did not pick them up enough that the...

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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #3
Sorry dead.  Some or all. Or bad cabling
The cabling is pristine. I might take the coach to my local truck shop and do a batt test and see what that might say. Seems weird that all three would...

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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #4
Be aware that smart charger will often NOT charge extremely deeply discharged/dead batteries.

You may need an old fashion "stupid" charger to get the process started.

I am a little surprised that...


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Re: House batteries low after hours on the Genset
Reply #5
You can NOT accurately test a dead battery.  They must be fully charged to accurately load test them.

  • bigdog
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Re: House batteries low after hours on the Genset
Reply #6
You can NOT accurately test a dead battery.  They must be fully charged to accurately load test them.
Yep! I goofed.

It seems that if the voltage meter below the link panel was shown a large...

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Re: House batteries low after hours on the Genset
Reply #7
Too many things can cause voltage drop/surge in a generator.

More important would be to watch your inverter/charger monitor panel to see what voltage AND amps it shows to the  house bank.

  • bigdog
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Re: House batteries low after hours on the Genset
Reply #8
Too many things can cause voltage drop/surge in a generator.

More important would be to watch your inverter/charger monitor panel to see what voltage AND amps it shows to the  house bank.
As I...

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Re: House batteries low after hours on the Genset
Reply #9
As I recall. The panel showed 12.8 V @ 110 Amps. I'll double check that in the AM. It's a bit late to run the genset.

That 110 amps means the inverter/charger WAS doing its job-- putting 110 amps...

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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #10
That 110 amps means the inverter/charger WAS doing its job-- putting 110 amps into your house battery bank.  Only 12.8 VDC with that high amp input means they were very deeply discharged.
Thanks...

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Re: House batteries low after hours on the Genset
Reply #11
The charger should be able to handle the 110 amps

A desulfurization device can slowly restore sulphated agm's I understand.

Good luck

Re: House batteries low after hours on the Genset
Reply #12
I would disconnect the battery cables and check each battery voltage separately. It sounds like one may have a shorted cell. If one is significantly lower than the others, hook the other two back up leaving out the low one and try charging them....

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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #13
I would disconnect the battery cables and check each battery voltage separately. It sounds like one may have a shorted cell. If one is significantly lower than the others, hook the other two...


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Re: House batteries low after hours on the Genset
Reply #14
Don, I disconnected each battery and checked the voltage. All three were at 11.9 on my volt meter and this was after two-three hours of charging at 110 amps@12.8 volts. None of the batteries was...


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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #15
Three hours at 110 amps, still 11.9, 3.5 yrs old, not sure of their history, I believe your batteries are not worth having tested.  Replacement at OReillys $459 each, 10 % off for veterans. ...


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Re: House batteries low after hours on the Genset
Reply #16
Sounds like you took good care of them.  What was the float charge, I believe their spec is around 13.5?  The Oreillys I just replaced were new May 2003, so they made it 6 yrs.   And so 3.5 to 6 yrs, depending on use, may be the norm.  That is ok...

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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #17
Sounds like you took good care of them. 

Well I'm not to sure about that at this point. 

I did look up a formula for the timing involved to charge a battery bank of 750 AH that shows 11.9...

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Re: House batteries low after hours on the Genset
Reply #18
Jacks post on the mk gels matches what Foretravel installed new.  Gels typically last 10-12 years in our coaches.

The gels different chemistry can take lower charging rates than the recommended 1/5th or 1/20th of capacity with less  damage.

Or...

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Re: House batteries low after hours on the Genset
Reply #19

Went out and shut everything down and isolated each house battery one at a time to check voltage. All three are at 11.9. visually all the batteries look fine. I.E. They are not bloated. If anything...


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  • bigdog
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Re: House batteries low after hours on the Genset
Reply #20

After you replace your batteries, make sure your system is set to AGM. 

The link 2000 manual says there is a setting for AGM but it doesn't come up in the set up menu F-03. When I bought...

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Re: House batteries low after hours on the Genset
Reply #21
It sounds like they were well cared for most of their life.

BUT, recently totally discharged to dead. 

So, replace them (unlikely they can be brought back if they remained dead for very long, but nothing to loose by trying) AND find out why your...

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Re: House batteries low after hours on the Genset
Reply #22
what inverter is in your coach?

Re: House batteries low after hours on the Genset
Reply #23
 

I wonder if it might be better to just go to the old wet cell design and at least save money. As I'm not even sure what I've done wrong to ruin the AGM's in only 3.5 years of being plugged in...


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Re: House batteries low after hours on the Genset
Reply #24
The F02 menu's third selection is AGM.

Your inverter is serialed numbered past 100,000 and has the ability to have a necessary battery temp management system plugged into it to alter the charging profile to the correct one for the temps the...

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