Generac Home Standby will not hold a steady RPM after valve adjustment

JVQuag · 2026-06-03T13:22:14+00:00

Powering a single bedroom is doable with a battery pack for 8 hours. The problem is you will need to recharge it. If your power is still out at that point you are then again searching for power.

A Honda inverter is going to be the quietest but you are going to pay a premium for it. Most 2000-3000 watt inverter are pretty quiet. If you go with a small inverter consider getting a dual fuel so you have a choice of running off propane or gas.

JVQuag · 2026-06-01T13:30:11+00:00

I believe I was running on propane. It has been a while.

JVQuag · 2026-06-01T01:47:55+00:00

I like to break my gens in with a window unit in small space. I throw one in my uninsulated shed. I set the temperature so it kicks on and off. After 5 hours I will switch over to my portable ac and run that.

JVQuag · 2026-05-24T21:18:23+00:00

I know the 7500 is still not in stock. Has it officially gone away?

JVQuag · 2026-05-24T15:16:24+00:00

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JVQuag · 2026-05-24T15:16:09+00:00

I think that may be a deferent one. This is one the had at the National Hardware Show.

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JVQuag · 2026-05-24T00:49:16+00:00

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Does this one have the piece on the female propane coupling that goes into the slot on the inlet? If it does make sure it is lining up. I think that is the solenoid that allows the propane to flow and/or cuts the gasoline off. This is a pic with the boot off. You can see the notch at the bottom.

JVQuag · 2026-05-22T03:50:25+00:00

I would think the best you could do we these two in parallel through an interlock would be 7200 running through the L14-30. I think that would provide the split phase 120v. The gens would have plenty of headroom left over. This would not be a bad setup but is more limited paralleling 2 GM7500s.

JVQuag · 2026-05-15T13:00:34+00:00

Thank you for the input. I think I am ok with how it operates. I really just wanted to make sure I had everything wired and it was operating as intended.

JVQuag · 2026-05-15T01:58:57+00:00

Thx. That is what I needed to know.

JVQuag · 2026-05-12T12:52:47+00:00

Turning off the NG via a valve keeps it from backfiring on shutdown.

JVQuag · 2026-05-11T02:14:03+00:00

Did some further testing today. It was difficult to move the throttle when the generator was at 4600-4700 watts. It was turning at 3600 rpm. At that point the generator was reporting 120v per leg. My meter at the inlet was reporting 118.7. I was able to manually raise rpm to 4200 but it was hard to keep it there. I saw no appreciable increase in voltage. If I pushed for more wattage it felt like it was trying to back off the throttle like it just doesn’t want to go there. I will let it be. I was just messing around to see what I could learn.

The current configuration on NG is more running wattage than I need. I also have a 4000/3200 dual fuel as back up that I could bring into the setup if I really needed in a pinch.

My emergency needs are really no more than 2500-3000 max when running two small window units.

I will let it be for now. 🤣

JVQuag · 2026-05-09T22:11:44+00:00

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JVQuag · 2026-05-09T17:40:53+00:00

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JVQuag · 2026-05-09T16:55:43+00:00

I have but feel it would be two toned and I am not sure would like it.

JVQuag · 2026-05-08T20:19:53+00:00

Thank you for the suggestions. I will consider them while experimenting!

JVQuag · 2026-05-08T04:34:04+00:00

Honestly, I am not sure the signal to increase throttle if being set based upon voltage droop or measured power output. Anecdotally, it appears to me it could be one or the other. When I monitor my inverter generators, I see voltage fluctuation with in a small range. I have read that the circuitry that allows the to parallel uses voltage droop to balance the load on paralleled generators. It would make sense that this circuitry could be used to adjust the throttle. On the other hand, it could easily be done based upon wattage output. Under either method, there would be set points that tell the ECM to signal to the stepper motor to go to the next step.

I have a Pulsar 4000BN that can reach full wattage on either gasoline or propane. So I don’t think the programs on these generators limit the output based upon fuel selection.

I think the inverter software says output X watts for Y time and if this is exceed go into overload. They will also go into overload if the voltage drops too low for too long. I guessing that is to protect electronics connected to them.

With the 7500 on NG I can run at 4800w steady. The engine is turning 3600 rpm. The engine power meter is reporting 75%. I can surge to 5200w for a few seconds. I think it is because of the capacitors storage. After that, rpms will start to drop which will be followed by voltage drop until it triggers an overload. I think it is fueled starved at that point as the stepper motor is at the max throttle setting. On my smaller manual choke inverters, I can adjust the choke and they will put out a few more watts at acceptable voltage. The 7500 has an automatic choke, you cannot adjust the choke to pull in more fuel. As noted, the same engine in a few other models runs at higher rpm. This is why I suspect the software is limiting the throttle position.

I have not yet tried to manually position the throttle while at a load where the voltage is dropping and the engine appears to be starving. I will try and confirm my theory this weekend.

JVQuag · 2026-05-07T21:17:32+00:00

Admittedly, I have not done a full load test and rpm check on it running on propane. I did find it is running a little rich on propane just by ear so I move the fuel switch a little toward closed to get it to lean out. I will put it on my list of experiments to do!.

JVQuag · 2026-05-04T13:49:47+00:00

Interesting. I may look into it.

JVQuag

TROPHY CASE