Good Sam Club Open Roads Forum: Turning off the generator with the AC going?
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 > Turning off the generator with the AC going?

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supercub

Modesto CA

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Posted: 10/01/20 08:29pm Link  |  Quote  |  Print  |  Notify Moderator

Kinda messed up today. I had the generator running and the invertor switched on, ( usually turn the invertor off when running the generator) both AC units were running. The AC's cycled off and a few minutes later I was going to leave, so turned off the generator, forgot the AC's were on, but not running. The inverter was still on...........will this hurt anything........will the AC's try to run off the invertor? I have 4 house batteries. Do you think I hurt anything? I wasn't around, so don't know if the AC's tried to run or not off the batteries.
I've always turned the AC's off prior to turning off the gen or making sure the AC switch is off before starting the gen.
Does it hurt to turn the generator off with the AC's running?
Does it hurt to turn on the generator with the AC switch "ON" so they'll try to start as soon as the gen comes online?

Lwiddis

South of Lone Pine, California

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Posted: 10/01/20 08:32pm Link  |  Quote  |  Print  |  Notify Moderator

“Does it hurt to turn the generator off with the AC's running?”

Read your manual. My generator booklet says to remove loads and run for a short time before turning off.


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time2roll

Southern California

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Posted: 10/01/20 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

Best practice to start and stop a generator with minimum load. Hard on the regulator and engine to start and go immediately to high throttle. Hard on the regulator trying to maintain voltage as the engine winds down. 30 seconds is generally enough wait time.


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rk911

DuPage County

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Posted: 10/01/20 08:53pm Link  |  Quote  |  Print  |  Notify Moderator

our AC does not run off the inverter. yours is likely the same.


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coolmom42

Middle Tennessee

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Posted: 10/01/20 10:42pm Link  |  Quote  |  Print  |  Notify Moderator

rk911 wrote:

our AC does not run off the inverter. yours is likely the same.


This. It would have to be a honking big inverter to run AC.


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DrewE

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Posted: 10/01/20 11:17pm Link  |  Quote  |  Print  |  Notify Moderator

So far as the generator is concerned, the AC thermostat "on" but not actually cooling is no different than the AC thermostat "off." In both cases, the air conditioner is not running and hence not consuming power.

As was said, best practice is to turn off loads before shutting down the generator. However, it's generally unlikely that failing to do so accidentally will cause trouble. It's in the category of things to avoid, but not in the category of things to keep you up all night worrying about should they happen.

Shutting the thermostats off before starting the generator is strongly recommended; starting under load, especially a heavy load such as two air conditioners starting up simultaneously, is rough on the generator. Let it start up and stabilize (and ideally warm up a bit), then add the significant loads individually so far as it is practical to do so.





cavie

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Posted: 10/02/20 04:12am Link  |  Quote  |  Print  |  Notify Moderator

no problem with turning off the gen under load. No different then if it ran out of fuel. A/C s not on the inverter. Gen will to start an A/C until it is up to speed. Built-in delay.


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JoeH

Apollo Beach,FL

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Posted: 10/02/20 04:45am Link  |  Quote  |  Print  |  Notify Moderator

What he said above ==


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wa8yxm

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Posted: 10/02/20 05:40am Link  |  Quote  |  Print  |  Notify Moderator

THough the book, parts of which are written not by engineers but lawyers. Says To "Remove all loads" and that is also the BEST advice and a very good habit to get into.

Going from Generator to off. or from shore power to off. Should not harm the A/Cs or anything else.. Going from one source to the other (Shore to generator or generator to shore) without a 3 minute pause Can damage the A/C and weld the auto transfer switch. But going from ON to OFF,, Should not damage.

I stress however the qualifier SHOULD not...

That said I've done it many times without damage.


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dougrainer

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Posted: 10/02/20 05:46am Link  |  Quote  |  Print  |  Notify Moderator

Does not hurt the Genset. What is DOES hurt are the contac points in the 120 volt Transfer switch. It causes "arcing" on the points and over time will cause the Transfer switch to malfunction. Doug

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