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Old 05-23-2020, 10:39 PM   #1
Junior Member
Brand: Thor Motor Coach
State: Florida
Posts: 1
THOR #3456
Engine battery trickle charge question

We own a Vegas 24.1 Thor class A. when it is attached to shore power is the engine battery maintained with a trickle charge from the converter?

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Old 05-23-2020, 10:46 PM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 9,729
THOR #7035
If things are working right AND you have your USE/STORE switch in USE.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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Old 05-25-2020, 10:09 PM   #3
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 1,379
THOR #2631
One method of determining if the converter is charging either the coach or chassis batteries when on shore or gen is to buy yourself an inexpensive multimeter (use the voltmeter function) and carefully measure across each battery when charging; and use/store is on. if you measure approx 13vdc or higher, under light DC loads, then you should be good. Note that some coaches have battery charge control systems that monitor voltages on these battery strings and may not connect the strings together, for charging from converter, for several minutes.

Just to add, some coaches may not be designed to charge both battery strings off converter......I want to say MBenz chassis based units, but my old memory could be very wrong. I am sure someone will clarify this.
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Old 05-25-2020, 11:04 PM   #4
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,089
THOR #8860
You're right: Mercedes doesn't let shore power charge it's chassis battery.
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Old 05-27-2020, 12:29 PM   #5
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 3,327
THOR #12751
My current coach as a BIM160 and maintains the chassis battery on shore power when needed.

My last coach did not so I added this and it worked great! Never had to put a maintainer on the chassis battery with it.

Mega TRIK-L-START Starting Battery Charger/Maintainer
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engine battery

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