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Old 01-29-2015, 09:59 AM   #15
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Maybe I'm missing something but, I have to question why would you want to.
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Old 01-29-2015, 11:13 AM   #16
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I have started mine, because I was plugged into 15 amp service. I wanted to run AC for a while.
I did wait for the transfer switch, before turning on the AC.
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Old 01-29-2015, 11:17 AM   #17
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I made the mistake of starting the generator( I wanted to warm it up before changing the oil) while connected to shore power.

This mistake:

1. Tripped the shore power circuit breaker.

2. Ruined the inverter, probably overloaded the automatic transfer switch that was built in.

And then shortly thereafter the power transfer switch failed.

This was on a 2010 Damon Astoria.
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Old 01-29-2015, 11:19 AM   #18
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Quote:
Originally Posted by pasdad1 View Post
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.
Also many air conditioners have their own built-in startup delay.
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Old 01-29-2015, 11:44 AM   #19
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I heard two questions: 1] starting the engine while shore power is probably not a big issue. The engine only provides 12vdc power so the battery isolator and inverter while likely sort out 12v priorities. 2] starting the genset while on shore power may be more problematic. Yes, gensets, x-fer switches and AC units usually have delay functions to dampen start-up loads. However, since most x-fer switches give the genset priority, and are not designed to transfer under load; starting the genset would eventually result in an attempted by the x-fer switch to flip over to the genset with the possibilty that one or more high amp loads maybe engaged [namely A/Cs, bat charge, hot water heater, etc]. Accordingly, I would be incline to shut-down high amps loads before "transferring" from shore power to genset.
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Old 01-29-2015, 02:48 PM   #20
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As to the OP's questions. The transfer switch should switch to the generator if both shore power and genny power are available. You should not switch with large loads active (such as air conditioning), as there is a risk to the transfer switch contacts.
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Old 01-29-2015, 02:53 PM   #21
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Quote:
Originally Posted by Crankshaft View Post
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
Good question. There is a delay to allow the generator output to switch before the transfer switch switches power source. You will see this just by starting the genny with shore power attached.

However, this brings the question that I and others have recommended not to switch with large loads such as air conditioning active. In the case of genny autostart with shore power present and air con running, is this need encompassed?
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Old 01-29-2015, 05:30 PM   #22
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I have started the genset once while plugged into shore power it tripped the main breaker on the genset so no more for me. I have a 2011 Damon Astoria. Chassis motor no worries.
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Old 01-30-2015, 06:49 AM   #23
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I'm more confused that I was before I stated this thread...
I will go the route I have since I bought her.
unplug shore power before starting Gennie
I do start the MH while plugged into shore power.
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Old 01-30-2015, 07:13 AM   #24
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Tim,

I think that is the best approach..
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Old 01-30-2015, 07:47 AM   #25
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i turn the breakers off on the gen set after using the unit, i put the breakers on before i hit the road to run the a/c units while traveling. I also disconnect shore power before starting the generator, to run it under load one a month.
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Old 01-30-2015, 09:01 AM   #26
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running gen when on shore power

Have a 2012 Thor Challenger. Owners manuel states to turn off shore power first before starting generator. Their reasoing was it can cause confusion to the transfer switch. Just to avoid problems as others have stated earlier, I prefer to follow their recommendations.
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Old 01-30-2015, 09:11 AM   #27
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Generator

On our 99 holiday rambler we are 30 amp. If we want to run both roof airs which is rare we have to run generator to run the rear air.
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