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Old 04-18-2016, 10:15 AM   #1
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Any issue with turning on your generator while hooked to shore power?

Somebody told me this was a no no. I realize there isn't usually a need, but I'd like to know if it's death to anything if it happens.


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Old 04-18-2016, 10:23 AM   #2
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I have done it several times when doing maintenance on the generator while still hooked to shore power. Ours is set such that Generator has priority over shore power. So once started and breaker not tripped on genset the transfer switch transfers power to the generator.

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Old 04-18-2016, 10:27 AM   #3
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Originally Posted by Bloodyhell View Post
Somebody told me this was a no no. I realize there isn't usually a need, but I'd like to know if it's death to anything if it happens.

It shouldn't be a problem but...

One popular opinion is to avoid this practice especially with big loads. The idea is to protect the ATS from problems it SHOULD be able to handle.

My normal pattern is to turn off high load items like the air conditioners and such when transferring between shore and generator power. I'm certain some folks don't worry much about it and let the ATS do its thing.

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Old 04-18-2016, 10:45 AM   #4
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+1 for SkyBoss. As long as there is a minimal electrical load when starting the generator it is not a problem. The idea is to prevent arcing of the transfer switch contacts when the switch is energized. Same goes for when first connecting to shore power. Turn off any high loads.
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Old 04-18-2016, 12:52 PM   #5
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Starting the generator while plugged into shore power is safe enough, but you will get a tiny double voltage spike at the point of changeover. It is enough to blow an appliance. Know of someone who destroyed 2 Keurigs doing that. So we try to be off shore power before we turn on generator.
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Old 04-18-2016, 01:02 PM   #6
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I would just turn everything off, unplug shore, start gen set turn on what you turned off.

Not sure why people are so lazy
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Old 04-18-2016, 02:00 PM   #7
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I do it all the time when I exercise the genny while plugged in at storage. I make sure there are no loads present. No problem.
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Old 04-18-2016, 02:05 PM   #8
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Yes. Should have clarified my post. No loads present when this is done.

When heading out for a trip and cooling things down then switching to Gen. We do the full power down switch then power up.
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Old 04-18-2016, 02:43 PM   #9
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Old 04-18-2016, 03:09 PM   #10
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Theoretically, there should be no issue, but that means your transfer has to be working properly and doesn't momentarily glitch. I had it happen once on my Diplomat and blew some circuit breakers. I try never to do it now.

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generator, power, shore power

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