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coach voltage question

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Joey and Jackie Cashen:
2001 Marquis(455 Cat) I keep my coach plugged into 50 amp power. I have not run the engine for 2 months. When I stated the coach today the voltage was 12.4. It soon rose to 13.8 with the engine running. I would have expected the voltage to be at 13.8 with constant 50 amp power. The batteries were replaced 6 months ago and water level is OK. Is this drop common or do I have electrial problem?
Any ideas?
Thanks,
Joe Cashen

Jerry Carr:
Hi Joe,

I really don't know much about the voltage but are you referring to the house or chassis battery's?

I also keep my rig plugged in while parked in our garage. My battery's are the factory originals with the chassis units they are maintenance free and the house are wet cells( new in 06) I see 13,8 most of the time.

Did you  replace your battery's with the maintenance free style or did you retain the wet cell battery's?


Regards, Jerry

Richard And Babs Ames:
Not coach specific but not all inverters charge the chassis batteries as we had to add an Xantrex Echo Charger to keep the chassis batteries up. We found out when we ran the Onan Genset for 190 hours after hurricane Charley and the ibtteries did not stay charged but the electronics on the gen set had a draw on them.

Joey and Jackie Cashen:
Hi Jerry,
I have the same set up as you. House batteries are wet 6v. The coach started well and everything else seems OK.
Joe

Jerry Carr:
Well Joe, I guess the systems all vary as well as the voltage, I am not sure what happens to battery life if we keep the rigs plugged in full time.

 I really didn't plan on going back to school on the systems so if the battery's do go bad after 4-5 years I plan to replace them!
I am still interested in the maintenance free models ( I have grown very Lazy) but I don't know if they even make a 6 volt?

I plan to look around at the FMCA rally in Redmond. If you are heading that way I am sure they will have someone selling them if not I will see what I can find out and post in September

Regards, Jerry

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