If I am parked (at home) hooked up to shore power should the house and chassis batteries read the same voltage? I have a Monaco DP and it has 3 house batteries and 1 huge chassis battery. House reads 13.2 and chassis reads 12.4. Its been parked for a week. I load tested the chassis battery and it load tested good and has stayed at about 12.4 + a little before I tested it. No guess work please--come in Doug!

year and model of the Monacosomebody with the same one, or one of the RV tech shop service guyswill have that infobut if you have big black box with fuses and relays aka BCC/battery control center, in a side compartment or under a front hatchopen the lid and check for the resettable Breakers , there are several on the inside

Your Monaco likely has a "BIRD" (Bi-directional Isolator Relay Delay) device that only charges the chassis battery after the house batteries reach ~13 volts when on shorepower. When the house battery voltage drops, the BIRD cuts off the chassis charge. It looks like you're seeing the chassis battery voltage after the BIRD has cut off and the initial float charge has dissipated. I'm sure Doug can explain it better than I did though...

Some are setup to charge the chassis battery from shore power and some aren't. And some that are setup to charge the chassis battery have failed components. And that is NOT a guess.

I gave up on my inverter/charger maintaining my batteries at Home even though I have an Echo charger between the chassis and house batteries. When I park in the drive way now, I have it so I can remotely connect a Dual Battery Tender....in my close to 15 years of charging at home, this has worked out the best.

If you find out you don't have a BIRD or other system to keep the chassis battery charged you can easily add one.Trik-L-Start

Battery Question | Good Sam Community

Dutch_12078
Explorer II
Jun 02, 2019
Your Monaco likely has a "BIRD" (Bi-directional Isolator Relay Delay) device that only charges the chassis battery after the house batteries reach ~13 volts when on shorepower. When the house battery voltage drops, the BIRD cuts off the chassis charge. It looks like you're seeing the chassis battery voltage after the BIRD has cut off and the initial float charge has dissipated. I'm sure Doug can explain it better than I did though...
MrWizard
Moderator
Jun 02, 2019
year and model of the Monaco

somebody with the same one, or one of the RV tech shop service guys

will have that info

but if you have big black box with fuses and relays aka BCC/battery control center, in a side compartment or under a front hatch

open the lid and check for the resettable Breakers , there are several on the inside

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