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Old 07-25-2018, 02:39 PM   #1
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Running both of my A/C units shut down my generator

I got my Bounder back from the shop today. The roof is now recoated (looks great) and two new Coleman A/C units. I previously had two 13500 BTU units, but they told me putting a 15000 BTU unit on the front would keep the main area of the coach cooler here in Tucson and in the California desert where I am taking it.

But now if I try to run both units, after about 5 minutes the Onan 5500 Marquis generator dies. I can run either A/C unit with no problem and the generator does fine. I realize that when Iím shore power, Iíll only be able to run one at a time anyway since Iím limited to 30A service.

Maybe the generator doesnít like the heat right now. Is 111į outside as I type this. Any ideas or just live with it? Thanks, Tom
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Old 07-25-2018, 02:53 PM   #2
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Has the generator been run regularly and when is the last time the fuel pump was changed?
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Old 07-25-2018, 02:59 PM   #3
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Has the generator been run regularly and when is the last time the fuel pump was changed?
I just tuned up the generator and replaced the fuel pump at the same time. New spark plugs, new oil and oil filter, and new air filter. Did a Seafoam treatment to clear out the carbon and old varnish. Ran it continually for two days to test it out. Itís currently in the front driveway running with the 15000 BTU front AC on high.
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Old 07-25-2018, 03:11 PM   #4
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If you were overloading the generator, a breaker should trip out.

It could be starving for gas, and at high output, may be draining the float bowl. When it dies, hit the primer on the generator panel and listen for the fuel pump to run fast for a bit. That would mean its filling the empty carb.

It may also need a cleaning of the cylinders, to keep it running cooler.
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Old 07-25-2018, 03:29 PM   #5
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If you were overloading the generator, a breaker should trip out.

It could be starving for gas, and at high output, may be draining the float bowl. When it dies, hit the primer on the generator panel and listen for the fuel pump to run fast for a bit. That would mean its filling the empty carb.

It may also need a cleaning of the cylinders, to keep it running cooler.
Is there an adjustment for the float?
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Old 07-25-2018, 03:44 PM   #6
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You could leaving the fans running on both AC units. That way whenever a compressor starts up, it is starting only the compressor, not the fan at the same time.

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Old 07-25-2018, 03:44 PM   #7
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Is there an adjustment for the float?
No, if the bowl is draining under load, it has a supply issue. Fuel pump, fuel filter, fuel line.

The carb bowl is like a toilet tank. When the gas goes down, the float goes down, opening a valve to let in more gas. The gas needs to be under pressure to flow in.
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Old 07-25-2018, 04:03 PM   #8
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Quote:
Originally Posted by tada View Post
I got my Bounder back from the shop today. The roof is now recoated (looks great) and two new Coleman A/C units. I previously had two 13500 BTU units, but they told me putting a 15000 BTU unit on the front would keep the main area of the coach cooler here in Tucson and in the California desert where I am taking it.



But now if I try to run both units, after about 5 minutes the Onan 5500 Marquis generator dies. I can run either A/C unit with no problem and the generator does fine. I realize that when Iím shore power, Iíll only be able to run one at a time anyway since Iím limited to 30A service.



Maybe the generator doesnít like the heat right now. Is 111į outside as I type this. Any ideas or just live with it? Thanks, Tom


At 111, you'll need an extra 7-8 amps to run the compressors...around 19-20 amps for the 15 and 17-18 amps for the 13.5. That could be in the 4500 watt neighborhood, neglecting any starting surges. If the converter is charging or the water heater is heating you could easily bog down a 5500 watt gen (especially if itís a bit weak already).
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Old 07-25-2018, 04:09 PM   #9
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No, if the bowl is draining under load, it has a supply issue. Fuel pump, fuel filter, fuel line.

The carb bowl is like a toilet tank. When the gas goes down, the float goes down, opening a valve to let in more gas. The gas needs to be under pressure to flow in.
Thatís going to be tricky to fix. Itís got a new fuel pump, fuel, filter, and fuel line.
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Old 07-25-2018, 04:14 PM   #10
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At 111, you'll need an extra 7-8 amps to run the compressors...around 19-20 amps for the 15 and 17-18 amps for the 13.5. That could be in the 4500 watt neighborhood, neglecting any starting surges. If the converter is charging or the water heater is heating you could easily bog down a 5500 watt gen (especially if it’s a bit weak already).
I think the heat is a contributing factor here. The gennie is 18 years old with about 1300 hours on it. Even tuned well, it’s probably maxing out its current capabilities in this weather. I’ll try to fire both AC units up later tonight when it cools down a bit. Like into the 90s
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Old 07-25-2018, 04:14 PM   #11
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You getting a code when it shuts down? At that temp, are you sure its just not overheated the genny and shutting down because of that?
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Old 07-25-2018, 04:23 PM   #12
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You getting a code when it shuts down? At that temp, are you sure its just not overheated the genny and shutting down because of that?
This generator doesnít seem to display codes. The start switch doesnít have an indicator that blinks. Just a rubber cover. As I posted above. Itís running right now in this heat, powering the 15k BTU AC.
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Old 07-25-2018, 04:45 PM   #13
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This generator doesnít seem to display codes. The start switch doesnít have an indicator that blinks. Just a rubber cover. As I posted above. Itís running right now in this heat, powering the 15k BTU AC.
Try shutting down the AC which is running now and turn the other AC on to see what happens.
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Old 07-25-2018, 04:56 PM   #14
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Quote:
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I think the heat is a contributing factor here. The gennie is 18 years old with about 1300 hours on it. Even tuned well, itís probably maxing out its current capabilities in this weather. Iíll try to fire both AC units up later tonight when it cools down a bit. Like into the 90s


The AC compressors are rated at 95 degrees: as you go up in temp you go up in current. By 115 itís 4 amps per compressor . Itís a lot and something g Iím struggling with designing a system to keep me cool in West Texas on 30 amps.

I bet at 95 you fire up both just fine.

If it does, I wonder if the starting surge is getting you or the running amps? If itís the starting sure a couple of $300 easy starts from micro air could be your ticket...
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