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 > Can I run my Onan while plugged into shore power?

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mrad

Prineton, MN

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Posted: 05/03/21 03:57pm Link  |  Quote  |  Print  |  Notify Moderator

My new to me 5th wheel has an Onan 5500 generator. Can I exercise the Onan while being plugged into shore power at home?

dedmiston

The West

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Posted: 05/03/21 04:03pm Link  |  Quote  |  Print  |  Notify Moderator

Yes and no.

You can run it, but it won't actually exercise it since there won't be any load.

You're better off disconnecting from shore power first.


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Lwiddis

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Posted: 05/03/21 04:08pm Link  |  Quote  |  Print  |  Notify Moderator

It does help to move gasoline through a generator but a load on the generator is also necessary for true “exercise.”


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mrad

Prineton, MN

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Posted: 05/03/21 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

dedmiston wrote:

Yes and no.

You can run it, but it won't actually exercise it since there won't be any load.

You're better off disconnecting from shore power first.


Thanks. If I am starting it weekly to keep gas running through it, is it best to unplug it? Can I start it while plugged in then unplug it?

navigator2346

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Posted: 05/03/21 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

Power should default to the generator while plugged in but to be on the safe side, I would secure the shore power

Bionic Man

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Posted: 05/03/21 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

dedmiston wrote:

Yes and no.

You can run it, but it won't actually exercise it since there won't be any load.

You're better off disconnecting from shore power first.


Maybe some are set up that way, but mine isn't. If I have my 5er plugged into shore power and the generator running, the generator is the default source of power.

That said, there is no reason to have the trailer plugged in when the generator is running.


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enblethen

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Posted: 05/03/21 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

Don't take a chance on back-feeding. Unplug your rig then start genset.


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LouLawrence

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Posted: 05/03/21 05:07pm Link  |  Quote  |  Print  |  Notify Moderator

Assuming you have a working automatic transfer switch, then yes.

bukhrn

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Posted: 05/03/21 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

Bionic Man wrote:

dedmiston wrote:

Yes and no.

You can run it, but it won't actually exercise it since there won't be any load.

You're better off disconnecting from shore power first.


Maybe some are set up that way, but mine isn't. If I have my 5er plugged into shore power and the generator running, the generator is the default source of power.


That said, there is no reason to have the trailer plugged in when the generator is running.
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phil-t

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Posted: 05/03/21 06:11pm Link  |  Quote  |  Print  |  Notify Moderator

I have run my 5500 Onan while plugged in. It switches to generator power - I did it simply to exercise the genny while I was campground hosting for 3 months. I think I did have an issue with the genny hour meter though. I think it continued to run after shutting down the generator - somehow being energized from the shore power. My hour meter went from 4XX hours to over 2000 this winter and I never used it except to exercise it monthly while plugged in.


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