I have a 2015 Jayco 26BHS. How do I charge my batteries while dry camping for a few days with an 800 watt inverter generator? I checked prior posts, but couldn't quite figure it out. Do I plug in the trailer power cord to the generator (through a 30 to 15 amp plug reducer) or do I run a battery charger directly to the battery, as is my primary thought? I will not have a huge battery draw need over the few days I will be without power; however, I do want to ensure the water pump will continue to work and the lights will come on each day.

Either way is fine with us however my ON-BOARD PD9260C which requires abit more power to operate does a much better job of re-charging my batteries back up to their 90% charge state. Just takes around three hours of generator run time to get my three batteries charged each morning.My portable 40AMP battery charger is a B&D VEC1093DBD which needs 780WATTS AC to operate it and being just 40AMPs I only get to re-charge two batteries in a three hour time frame...My Generator is a 2KW Honda EU2000i...I have my best battery performance by starting out each day/night run off my batteries when they are at the 90% charge state...Others may just charge for an hour or so each day but that never really works for me. My batteries start losing more performance each day doing this. I'm always afraid I will do harm to my battery bank.Probably just me but thats what I do each morning during breakfast where I am allowed to run my generator for three hours...Roy Ken

You need to have a way to charge the battery without overloading the generator. More specifically, you need to keep the charging current limited to approximately 30 amps. Even if not horribly discharged, the battery will probably pull more than that in the first few minutes of charging. One approach is to just use a charger rated at maybe 25 amps maximum, or one that allows you to control the output. If you want to use the power converter, posting the make and model might get some feedback on how well it may or may not work with the small generator. This all assumes you'll be at a fairly low altitude. At a few thousand feet the generator performance goes down. Best to test it all out at home first.I use an 800 watt Earthquake/PortaSource inverter generator, with two ways to prevent overloading it. One is to use a larger generator for the initial charge, then switch to the small generator. The other is to place the Progressive Dynamics converter into its 13.2 volt mode before starting, then bringing it up to 13.6 and 14.4 as the battery draws less current. Having an ammeter is pretty important to control all of this.

800 watts is good for about 30 amps into the battery. A good chance the converter will overload the generator with a low battery. Use the portable assuming it is 15 to 30 amps output. Just connect it on the battery direct, no need to remove anything.Once voltage gets up in the 14.2+ range continue for one more hour.Most likely the converter would quickly taper to a trickle charge at 13.6 volts.Give it all a test before you go.

A quick google for the owner's manual for your trailer says your converter will draw 8 amps. I suspect that's average so quite a bit more when it's first turned on charging depleted batteries. I don't think it will work with your tiny generator.As has been suggested, get an external charger with current limiting.As an aside, read the fine print on your generator / inverter: is it 800W CONTINUOUS?

Charging Battery with Generator | Good Sam Community

12 Replies

RoyB
Explorer II
Jun 02, 2016
Either way is fine with us however my ON-BOARD PD9260C which requires abit more power to operate does a much better job of re-charging my batteries back up to their 90% charge state. Just takes around three hours of generator run time to get my three batteries charged each morning.

My portable 40AMP battery charger is a B&D VEC1093DBD which needs 780WATTS AC to operate it and being just 40AMPs I only get to re-charge two batteries in a three hour time frame...

My Generator is a 2KW Honda EU2000i...

I have my best battery performance by starting out each day/night run off my batteries when they are at the 90% charge state...

Others may just charge for an hour or so each day but that never really works for me. My batteries start losing more performance each day doing this. I'm always afraid I will do harm to my battery bank.

Probably just me but thats what I do each morning during breakfast where I am allowed to run my generator for three hours...

Roy Ken
2oldman
Explorer II
Jun 02, 2016
Either way.

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Charging Battery with Generator

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