Onan output wiring

I am not familiar with new Onan units.

Do they have spec plaques designating 240/120?

I can see center tapping a stator to obtain N and two Lines for a three wire output. In that case a transformer would be mandatory for single phase/neutral full nameplate output.

At one time TRACE ENGINEERING sold a toroid 2/1 transformer rated 4 Kw. continuous 5 Kw surge. Very compact and significantly cooler (efficient). Check with OUTBACK company.

Chris Bryant wrote:
Unless it is an old unit, or a commercial unit, your Onan is a 120 volt genset, both breakers come off of one single winding. Is your rig a 50 amp or 30 amp rig?

As posted below, the generator is a year old and is used at a remote off grid fishing camp as backup to a solar/battery system.

You may well be correct, but my main point is that the units do not produce 240 volt power- on the schematics I looked at the windings all go to a common terminal, which feeds both breakers. It all depends on the model, though.

MrWizard wrote:
Somebody wired your breaker box wrong? What is the main in your breaker box?
Too much load on one side
It is most likey wired with all your loads on one side including one air
And the other side is only carrying the other air

Yes it could be reconnected for 230v but you don't need too do that
Just need to have a two line input breaker box, using both generator output lines
And balance the load distribution

The other question is the water heater on LP? What about the fridge?
When In hot weather using the genset and air, making sure those stay on LP manually is a good idea, so they don't switch over and use the Onan power

That Onan is big enough provided the loads are balanced

The unit isn't in an RV, it's wired ONLY into a 120v 2500 w inverter/charger which is backup to a small solar bank.

Matt_Colie wrote:
Without knowing the actual model number of the generator, we can not answer you. It is possible that it is two 30 amp line in phase and as such you don't have a 240 output, you have two 120V lines at 30 amps each. Onan has built all manner of machines.

Matt

The unit is new, model HGJAB-904
Thanks

Chirs

i have never seen a 6500 with only one winding
all i have seen are (2) winding's wired in parallel
some times tied together before the breakers sometimes not
but always (2) winding's

of course i haven't seen everything, ever done with Onans and RVs

Unless it is an old unit, or a commercial unit, your Onan is a 120 volt genset, both breakers come off of one single winding. Is your rig a 50 amp or 30 amp rig?

Somebody wired your breaker box wrong? What is the main in your breaker box?
Too much load on one side
It is most likey wired with all your loads on one side including one air
And the other side is only carrying the other air

Yes it could be reconnected for 230v but you don't need too do that
Just need to have a two line input breaker box, using both generator output lines
And balance the load distribution

The other question is the water heater on LP? What about the fridge?
When In hot weather using the genset and air, making sure those stay on LP manually is a good idea, so they don't switch over and use the Onan power

That Onan is big enough provided the loads are balanced

Without knowing the actual model number of the generator, we can not answer you. It is possible that it is two 30 amp line in phase and as such you don't have a 240 output, you have two 120V lines at 30 amps each. Onan has built all manner of machines.

Matt

Many older 6.5 NH Onans (1,800 RPM) have a terminal block inside the box with the breakers. If you know the wire numbers to reconnect the unit will deliver fifty amperes at 120 volts.

I would LOVE to get my greasy hands on one of these units.
With a WOOODWARD electronic governor to hold speed at precisely 1,800 RPM, these saturated field (self regulating) generators are near bulletproof.