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Open Roads Forum  >  Tech Issues

 > Disconnect load before stopping generator?

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GordonThree

Northern Michigan

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Posted: 07/11/19 01:25pm Link  |  Quote  |  Print  |  Notify Moderator

The topic says it all. This is in the rule book for several brands of generators. Its not in the book for my Yamaha, but Champion and Predator both mention it.

So my question is... lets say you run out of gas. The generator's going to stop, with the load connected. Is it ruined at this point? Will the sky start falling? Shouldn't the computer controlling the digital inverter be smart enough to see the engine is failing and disconnect the load?

I mean, it should only take a millisecond or two which is ages for a computer to sense the engine rpm are dropping and disconnect the load.

What happens exactly that they're concerned about?


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SidecarFlip

SE Michigan

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Posted: 07/11/19 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Not a clue. Ran my Champ dry under load with no ill effects.


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SOBOVA

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Posted: 07/11/19 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

Like thousands of other things out there,,,,, If you have the option, this is preferred. But I dont think it is ever prescribed as mandatory or your unit will blow up.

Old-Biscuit

Verde Valley

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Posted: 07/11/19 02:21pm Link  |  Quote  |  Print  |  Notify Moderator

Gen humping along under load....heat
Best practice is to unload and let gen set cool down before shutting down

Tripping ...out of gas, overloaded etc are NOT normal operating conditions

If trips.start back up and let it cool down then secure it.


Is it time for your medication or mine?


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JIMNLIN

Oklahoma

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Posted: 07/11/19 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

Its best long term to cut the load and then shut the gen set down. I never unplug cords from my gen set. ...unless moving to the next job.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 07/11/19 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

With ship-board generators, unloaded spin down was a law, not just a recommendation. Gagging and surging from a stopped-up fuel filter was mitigated by placing a primary filter between the bulk and day tanks.

When a voltage regulator on a regular generator encounters <55 Hz it goes into "forcing mode" which tests regulator strength. The Delco H9000 regulator I love so dearly could withstand 20 amps of field current at 180 volts. This is rotor current nothing to do with generator current.

A mistreated component takes its revenge out by having a short lifespan.

My AC system controls are always placed chest-high including the breakers. I have sold aftermarket small generator voltage-regulators down here because owners simply shut off the generator and then wondered why it would not re-start unless the load was disconnected.

The custom with generator loading

Switch the largest load first upon starting
Then progressively smaller loads


When unloading

Switch off largest load first
Then progressively smaller loads.

If a Ferro resonant line voltage transformer is present
Switch it off first

4x4van

California

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Posted: 07/11/19 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

The idea that load must be removed prior to starting/stopping a generator seems to fly in the face of AGS systems used to keep an RV cool (for pets, for example) while the owner is not there.


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Big Katuna

Deland, FL

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Posted: 07/11/19 03:32pm Link  |  Quote  |  Print  |  Notify Moderator

After you have to replace a rotor at $1000 just for the part made a believer out of me.

I shut off the ACs before unplugging too.


My Kharma ran over my Dogma.

LittleBill

Scranton, PA USA

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Posted: 07/11/19 04:25pm Link  |  Quote  |  Print  |  Notify Moderator

inverter gens are different then regular, once they can't hold the output, they disconnect, not like a normal generator where the avr trys the entire time the generator is winding down.





pianotuna

Regina, SK, Canada

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Posted: 07/11/19 05:18pm Link  |  Quote  |  Print  |  Notify Moderator

My inverter/charger has a time delay before connecting shore or generator power to the RV. I prefer to start the generator, wait for the connection, and then start the loads with the largest first.

When shutting down I prefer to shut down the loads first. I sometimes break that rule of thumb when it is 2 am.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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