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 > Voltage Spikes as Gen Runs out of Fuel?

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BFL13

Victoria, BC

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Posted: 10/21/19 12:28pm Link  |  Quote  |  Print  |  Notify Moderator

Found this advice for when running a converter off a generator (including inverter gens presumably)

"•Do not run out of fuel! When fuel levels get low the generator will splutter causing the voltage to surge up and down, if this goes too high it will damage components within the Converter"

This could easily happen in my case with my P2200 gen that has no fuel gauge, so I am wondering if the advice is correct about the voltage spikes. Must be others on here who might care too.

--Also, Mex has suggested doing this on purpose as a timer limit for how long to be in Absorption, so that wouldn't fit with this advice.

So what think? Thanks.

* This post was edited 10/21/19 04:32pm by BFL13 *


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2oldman

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Posted: 10/21/19 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

I thought inverter gens didn't produce spikes due to fluctuating rpm.

2manytoyz

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Posted: 10/21/19 12:42pm Link  |  Quote  |  Print  |  Notify Moderator

With a conventional generator, the change in RPMs will cause the frequency to shift, and the voltage to vary. Since the RPMs won't increase drastically, I wouldn't expect the voltage to spike high very much.

Not so much an issue with an inverter type generator. The waveform is created electronically, and the engine speed varies to meet load demands anyway.

I'm not too worried about this. Most RVs with generators have a conventional type, and they quit under load for a multitude of problems. I've been the RV community for a very long time, I've yet to read a post where someone had damage due to a generator unexpectedly shutdown.

I have had damage due to a massive power spike (fallen power line) at a campground, but that's a different topic!


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pianotuna

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Posted: 10/21/19 12:55pm Link  |  Quote  |  Print  |  Notify Moderator

Inverter generators do sag the voltage when they run out of fuel. They also do it when they are shut down. My yamaha has a disconnect switch on it. I'd love to use the Pinella remote to do the switch off, before shutting down, but the relay is only rated for 15 amps.


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time2roll

Southern California

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Posted: 10/21/19 12:55pm Link  |  Quote  |  Print  |  Notify Moderator

The quote is from what make and model number?


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Chris Bryant

Arden, North Carolina

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Posted: 10/21/19 01:12pm Link  |  Quote  |  Print  |  Notify Moderator

I can’t see a genset with a voltage regulator or an inverter type giving high voltage spikes- not sure about the cheap contractor type that use a capacitor for regulation.
The big problem with a voltage regulated set is it is trying to keep putting out ~120 vac, so the voltage regulator is boosting the rotor voltage, while the frequency drops.
IOW, I’d be more concerned with the genset than the converter, most of which can handle a wide range of input voltages.


-- Chris Bryant

BFL13

Victoria, BC

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Posted: 10/21/19 01:19pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

The quote is from what make and model number?


See answer to question about what gen and why

https://powermaxconverters.com/bowfishing-gear/

Note this is about powering trolling motors mostly ( amps wrt to thrust, etc) so not same as RV battery charging. Some interesting stuff though.

DrewE

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Posted: 10/21/19 01:26pm Link  |  Quote  |  Print  |  Notify Moderator

Any modern converter should not be harmed by such moderate input voltage changes. It may shut itself off, but that's hardly a problem when the generator is shutting down anyhow. A standard RV generator installation will have the voltage fluctuate and droop when it's turned off, anyhow, and there's not a lot that can be done about that.

Stopping (or starting) under load is a bit rough on a generator and is best avoided for that reason.





MrWizard

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Posted: 10/21/19 01:52pm Link  |  Quote  |  Print  |  Notify Moderator

I would not worry about inverter genny
it's been mentioned many times its synchronous generators
And the damage is mainly to the generator, not to converter


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time2roll

Southern California

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Posted: 10/21/19 02:02pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

time2roll wrote:

The quote is from what make and model number?


See answer to question about what gen and why

https://powermaxconverters.com/bowfishing-gear/

Note this is about powering trolling motors mostly ( amps wrt to thrust, etc) so not same as RV battery charging. Some interesting stuff though.
Not buying it. How about an empirical test?

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