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Old 01-28-2015, 06:32 PM   #1
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Starting the Generator while plugged in

I hope this is not a dumb question. Is it safe to turn the Generator on while the coach is plugged into shore power? Also the same question in regard to starting the coach engine while plugged into 110 power supply?
Thanks for replies....
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Old 01-28-2015, 06:34 PM   #2
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You should designate your coach make and model.

On my 2002 Monaco Windsor I can start both the generator and engine while plugged into shore power.
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Old 01-28-2015, 06:43 PM   #3
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Quote:
Originally Posted by Rocco42 View Post
I hope this is not a dumb question. Is it safe to turn the Generator on while the coach is plugged into shore power? Also the same question in regard to starting the coach engine while plugged into 110 power supply?
Thanks for replies....
Yes you can run the generator and engine while plugged into shore power.
By design the generator can not feed the coach if there is AC present at the
transfer panel.
Running the engine likewise will not be a problem.
Having said the above this applies only if there are no problems with the systems.
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Old 01-28-2015, 06:49 PM   #4
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To avoid damaging your transfer switch, (burned contacts) over the long haul, I always shut down everything drawing big power (1 or 2 amps shouldn't matter). Then switch to the gen.
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Old 01-28-2015, 06:51 PM   #5
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The important note that Art left out is that the only dumb question is the one that you were afraid to ask.

Always ask and it is best if you ask two people and hope you get the same answer twice.

I do concur with Art.
The systems are designed so that should never be an issue.

Matt
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Old 01-28-2015, 07:16 PM   #6
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Theoretically you can run the generator while plugged into shore power.

However I NEVER do that. Let's not tempt fate.

I spent my life repairing electronic equipment and have seen lot's of things fail that were "failproof".
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Old 01-28-2015, 07:22 PM   #7
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I may contradict the rest - but I did start the genny once and it popped the breaker....however I was stepped down to 110 on a GFI outlet...so a bigger source probably will work out. Since I did it once. I won't try it again for fear of what Arch said.
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Old 01-28-2015, 07:57 PM   #8
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Hi Rocco42,
Some coaches may be different, but the transfer switches I have been involved with all default to the generator as a power source. This means as soon as the transfer switch senses power from the generator, it allows generator power to flow to the coach, cutting off power from the shore cord source.

My concern is what mccsix posted. If you are drawing power during this event, it is tough on the transfer switch contacts.

There is no problem running the engine while connected to shore power or running the generator.
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Old 01-28-2015, 08:03 PM   #9
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X2 to GaryHD. And I, like Arch Hoagland, never do that. Why would you?

If I want to use the generator, I will first disconnect the shore power.
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Old 01-28-2015, 08:23 PM   #10
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X2 to GaryHD. And I, like Arch Hoagland, never do that. Why would you?

If I want to use the generator, I will first disconnect the shore power.
X3 on the above post. Our coach defaults to the generator. I was under the assumption that this was the norm. I believe that my ATS was fried by not shutting down the AC under load and firing up the genny while AC's were running.
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Old 01-28-2015, 10:10 PM   #11
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Having been in the electronics failure analysis field for 25 years, I would never stay hooked up to shore power and run the generator at the same time.

Things can fail and they always fail at the most unopertune time.

Better safe that sorry.
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Old 01-29-2015, 04:38 AM   #12
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X3 on the above post. Our coach defaults to the generator. I was under the assumption that this was the norm. I believe that my ATS was fried by not shutting down the AC under load and firing up the genny while AC's were running.
Can I throw a curve to this? If you have a transfer switch and an auto start for the generator, what may happen if your away from the coach and you lose shore power (like a power outage). Do the running AC's know not to come back on (delay) until the generator runs for a few minutes? Do they start back up as soon as the generator comes on resulting in fried electronics?

Fred
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Old 01-29-2015, 05:08 AM   #13
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Automatic transfer switches on RV's are not designed to switch UNDER LOAD,, they are designed to switch from a "NO POWER" or to a "NO POWER" condition, but not from one power source to another UNDER LOAD.

So, do I start my Genny while plugge in: YES, once a month
But I turn OFF the main circuit breaker first, or at the very least tur off all the power suckers (Water heater, fridge, A/C, et-al,, Leaving only the inverter powered electronics on.... And I may even turn off power to the inverter)

Same when I turn OFF the generator and return to shore power.
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Old 01-29-2015, 06:08 AM   #14
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Can I throw a curve to this? If you have a transfer switch and an auto start for the generator, what may happen if your away from the coach and you lose shore power (like a power outage). Do the running AC's know not to come back on (delay) until the generator runs for a few minutes? Do they start back up as soon as the generator comes on resulting in fried electronics?

Fred

Most of the bigger generators don't start producing power instantly.....their controllers let the engine get up to speed for a minute or two, then start producing power. This is usually enough of a delay. Also some transfer switches have a delay built into them.
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