tropical36
Southwest Florida_USA
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MrWizard wrote:If you unplug shore power with the A/C running,
The arcing will be at the shore cord male plug and the campground RV outlet.!
If you shut a synchronous generator off while there is a substantial load (A/C compressor) ,
The arcing will be in the transfer switch contacts,
But the biggest danger is damage to the the generator head,
As the generator head winds down, voltage drops rapidly and amp load of the compressor increases,
When the voltage is too low to hold in the ats, it drops out aka open the contacts that this amp load is flowing thru, but the back EMF from the breaking open circuit causes a power spike in the generator head and the field control circuit
That is where the expensive damage accumulates until there is failure,
A winding down generator, is not the same as flipping a disconnect or pulling a plug
I've always thought along these same lines and keep wondering why my coach has a gen start next to the bed for the convenience of starting or stopping during the night, without having to get up?
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4x4van
California
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All of the naysayers conveniently ignore RV's with automatic generator start systems that users use to keep their RVs cool when they are not there. Or am I missing something?
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PastorCharlie
NC
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My EMS manages the loads and prevents any damage to system. There is a 3-5 minute delay on the A/C startup.
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4x4van
California
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PastorCharlie wrote:My EMS manages the loads and prevents any damage to system. There is a 3-5 minute delay on the A/C startup. Understood, but how is that any different than without the EMS? When I start my generator, there is about a 30 second delay before it actually kicks in and provides power to the coach breakers. At that point, if my A/C is already turned on, it starts; exactly like if it was turned off and I turn it on at the thermostat. There's no difference -electrically- between turning the A/C on at the thermostat or at the breaker. The only negative that I can think of, is shutting down the generator while the A/C is on, since it doesn't instantly shut off, but rather it slows and the voltage drops. Does your EMS turn the A/C off prior to shutting down the generator? I don't think so (could be wrong).
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dodge guy
Bartlett IL
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The ACs will wait for 45 seconds to a minute to restart if left on. Also the auto changeover will wait about 30seconds before it switches over.
Best practice is not to do it, but if it happens once or twice there will be no harm.
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RLS7201
Beautyful Downtown Gladstone, MO
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4x4van wrote:All of the naysayers conveniently ignore RV's with automatic generator start systems that users use to keep their RVs cool when they are not there. Or am I missing something?
EXACTLY...............Do you have a degree in electrical engineering? Or just some good common ¢. GRIN
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4x4van
California
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RLS7201 wrote:4x4van wrote:All of the naysayers conveniently ignore RV's with automatic generator start systems that users use to keep their RVs cool when they are not there. Or am I missing something?
EXACTLY...............Do you have a degree in electrical engineering? Or just some good common ¢. GRIN
Richard Actually, both!![[emoticon]](https://forums.goodsamclub.com/sharedcontent/cfb/images/cool.gif "cool")
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MrWizard
Traveling
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RLS7201 wrote:4x4van wrote:All of the naysayers conveniently ignore RV's with automatic generator start systems that users use to keep their RVs cool when they are not there. Or am I missing something?
EXACTLY...............Do you have a degree in electrical engineering? Or just some good common ¢. GRIN
Richard
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The automatic generator start systems have timers, specifically to prevent startup shut down load problems, are not going to engage until the generator power is stabilized and are not going to shut down on board running generator while the tstat is calling for cooling, you could conceivably run out of fuel for the generator if it ran long enough, but that would not be a rather abnormal shut down
I do not know how much EMS support is installed with these auto start systems, for A/C use, but there must be some, in order to prevent generator shutdown or generator overload trip problems under what would be considered normal auto start conditions
* This post was
edited 10/31/20 03:58pm by MrWizard *
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