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Old 02-09-2014, 01:12 PM   #1
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Can I run the Genny without coach batteries connected?

I want to install my engine battery and run my engine and generator. Will anything be damaged or harmed because my coach batterie are not installed? I'm thinking probably not, but I am alway cautious when it comes the the electrical in my motorhome.

Thank you for your input or thoughts.
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Old 02-09-2014, 01:16 PM   #2
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Just make sure Steve that the loose battery cable ends are wrapped in rags so as not to come in contact with anything as.... when you start the genset your converters might charge up the cables. Which batteries start your genset? Chassis or house?
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Old 02-09-2014, 01:31 PM   #3
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Mine will run with the coach batteries disconnected, but shuts off it I cut off the starter batteries.
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Old 02-09-2014, 01:35 PM   #4
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As long as the genny runs from the chassis battery and you ensure the house battery cables are isolated, it should be ok.
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Old 02-09-2014, 01:47 PM   #5
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That's what I thought. I keep the coach battery terminals wrapped up for the drive to the storage facility for the winter, so we should be good.
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Old 02-09-2014, 02:36 PM   #6
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Many/most? motor homes are wired so that the generator is started by the house batteries. Winnebago is that way as are the few Fleetwoods friends have.
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Old 02-09-2014, 10:05 PM   #7
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Quote:
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Many/most? motor homes are wired so that the generator is started by the house batteries. Winnebago is that way as are the few Fleetwoods friends have.

My tiffin generator starts off of the house batteries
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Old 02-10-2014, 06:16 AM   #8
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Yeah I would double check which batteries do what. Most MH's that I have seen keep the Chassis(engine) battery isolated from running anything but the engine. They use the House batteries for starting the generator and running everything else.
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Old 02-10-2014, 06:28 AM   #9
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I'm curious to why........what is the gen supplying power to? Why are the battery's removed? Just trying to understand the situation before I give a opinion.
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Old 02-10-2014, 07:49 AM   #10
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I'm curious to why........what is the gen supplying power to? Why are the battery's removed? Just trying to understand the situation before I give a opinion.
He mentioned driving it to storage so my guess would be that he has the house batteries at home on a maintainer or something. Not sure why he would need the gen except heat pumps but who knows?
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Old 02-10-2014, 01:25 PM   #11
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On many coaches the generator is powered by the house batteries,, Just putting the Chassis (Engine) battery in wont start it.

ON some (however) you can use the Aux/Emergency start or Battery boost button (All different names for the very same button) to parallel the house and chassis systems but see note below

On others that may not work

you can also use a "Jump Pack" (Aldi's sells one about the right size cheap but I like 'em with around 1,000 amps peak) to start the generator and let it run for at least a minute before disconnecting the jumper (you need to make sure the converter is operating or the generator will simply shut off).


NOW, IN ALL CASES, if you remove the HOUSE batteries,, Gather all the POSITIVE wires together and bubble wrap them or other wise insulate them so there is no way on this earth for them to touch any other piece of metal or damage WILL be done.. may be nothing more than a tripped circuit breaker, or blown fuse, but damage will be done. Those wires are "HOT" when the generator is running, also when it is starting.
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Old 02-10-2014, 07:46 PM   #12
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Many/most? motor homes are wired so that the generator is started by the house batteries. Winnebago is that way as are the few Fleetwoods friends have.
That's how mine is wired.
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Old 02-11-2014, 07:09 AM   #13
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Thanks for all of the replies. Yes, the motorhome is in storage for the winter, and the batteries are at home on a maintainer for the winter. However, I thought it was a good idea to start the engine and genny every so often and that it wasn't good for them to sit all winter without being run. Now that you guys mention it, I do think the genny starts on the house batteries. Last year, I tried to start the genny off of the engine battery and no go. I could hook the engine battery up to the house battery cables just to start and run the genny for a while. I'm not lugging the house batteries down there for that.
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Old 02-11-2014, 01:23 PM   #14
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On my rig I can run the Generator engine with the AC breaker off on the genset. Then it is not putting current to my inverter/charger.

So, yes you can run the generator without the batteries connected, unless the batteries are needed to start the generator.

My rig has a separate battery that starts the generator. Some battery is required.
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