Forum Discussion

JCat's avatar
JCat
Explorer III
Jul 18, 2014

External Generator use on Class A

I have a 2004 Mandalay with a 7500W onan genny.
I have purchased a yamaha 2000w portable genny and wanted to use it connected as an external power source connected to my shore power cord.
The plan was to be more energy efficient as I only need to power my TV, sat receiver and a few outlets for computers.
There was a really good article in FMCA that seemed to show that this will work if config'd correctly.

I hooked it up and the RV EXPLODED INTO A MILLION PIECES !
Just kidding, thought my story was getting boring.

The Yamaha revved up to accomodate the load and then went into overload.
I then changed my Xantrax to invert mode and tried again, same result.

The Xantrax once it receives the added power, goes into charge mode for the house batteries and this is too much for the little 2000w genny so it overloads.

Is there a way to stop the battery charge and just allow the yamaha to power the rv like when I am using the inverter ?

24 Replies

  • Won't your inverter handle the low amperage draw items you want to operate???

    -Tom, W3TLN
  • How many amp draw do you have your inverter/charger set on? I always set mine a max of 15 amps to charge the batteries, then lower it to 10 for watching tv. No need to have the inverter inverting as you're getting 110 from the generator.

    My Honda 2000 uses about a gallon every 5-51/2 hours. The Onan 7500 uses about 1/2 to 3/4 gallon per hour so Honda is much more efficient.

    What I do is run the Onan while brewing coffee, hair dryer, toaster, etc and it Will handle all the big draw stuff and charge batteries, but after about an hour shutt it off and run the Honda on Eco mode with the inverter/charger set at 10 amp max until float is achieved.

    You can run the inverter/charger set higher but it dramatically affects battery life.

    Hope this helps.
  • I use a 1000 watt Honda to do what you wish to do.
    I set the Battery Charge rate to 5 amps. See if you can set your charge rate to a lower rate. Make sure the water heater and fridge is not on electric.