Onan 5500 Marquis lp

[carl.swoyer]

Well!!!
Pulled into O'leno State Park in Florida, 95° and 30 amp service. I decided to fire the Onan to run both 15 k AC units. While sitting outside enjoying the camping environment that dreaded Onan shut down occurred.
Code 33 and 13 service & under voltage . Great ! But at least I was able to get an appointment with Tampa Cummins Onan.
Anyone ever get a code 13/33


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[WillyBill]

Code 13 is "Undervoltage" - controller is unable to maintain rated voltage. (turn off something electrical)

Code 33 is not a listed code in the troubleshooting list that I have.

WB

 

[carl.swoyer]

Willybill
that's what I was reading.
I'm hoping for an easy fix,like the voltage regulator?
I have had this genset for 11 years bought it new. Have always been able to run both AC units and other things. We shall see what happened this Thursday morning.

Code 13 is "Undervoltage" - controller is unable to maintain rated voltage. (turn off something electrical)

Code 33 is not a listed code in the troubleshooting list that I have.

WB

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[WillyBill]

Hey Carl, Just curious...
Did you happen to notice if it was holding the rpm steady before it shut down? If not, the problem could be entirely mechanical in nature, not a control circuit. Such as fuel supply or solenoid, or fuel filter, or air filter. As mechanically minded as you are I know this is a long shot but you know the troubleshooting rule...keep it simple stupid. I have to use that reminder personally every time I jump to conclusions, LOL.

WB

 

[Lou_and_Bette]

Hey Carl, Just curious...
Did you happen to notice if it was holding the rpm steady before it shut down? If not, the problem could be entirely mechanical in nature, not a control circuit. Such as fuel supply or solenoid, or fuel filter, or air filter. As mechanically minded as you are I know this is a long shot but you know the troubleshooting rule...keep it simple stupid. I have to use that reminder personally every time I jump to conclusions, LOL.

WB

The only way I get any exercise. Oh, that and pushing my Luck.

 

[dave10a]

Generally speaking generators have a lousy power factor rating. Which means they can not handle inductive loads like an air conditioner as well as power from a pedestal which has power factor near 1. Some generators with the same power rating are better than other with power factor. With your propane powered generator you can expect that it will not perform well with two A/C's while running other electrical appliances as well. I would run only one A/C if it were me to assure reliable power from the generator.

 

[porthole]

Well!!!
Pulled into O'leno State Park in Florida, 95° and 30 amp service. I decided to fire the Onan to run both 15 k AC units. While sitting outside enjoying the camping environment that dreaded Onan shut down occurred.
Code 33 and 13 service & under voltage . Great ! But at least I was able to get an appointment with Tampa Cummins Onan.
Anyone ever get a code 13/33

You most likely are overworking your generator.

Onan's own specs rate the genset as capable of running two 13K AC units, not 15K.

Add the loss of rated power using propane, loss of rated power for temperature and you are lucky if you can run two 13K AC's.

Each side is only 23 amps, at sea level at 70 degrees.
Don't forget your converter, what was that drawing? Mine would pull 8-12 amps at times after a long tow.

 

[dave10a]

You most likely are overworking your generator.

Onan's own specs rate the genset as capable of running two 13K AC units, not 15K.

Add the loss of rated power using propane, loss of rated power for temperature and you are lucky if you can run two 13K AC's.

Each side is only 23 amps, at sea level at 70 degrees.
Don't forget your converter, what was that drawing? Mine would pull 8-12 amps at times after a long tow.

View attachment 58944

Does that take into account a battery charger, refrigerator, water heater and other electrical appliances running at the same time? I doubt that it could handle two 13,500 btu A/c's while running other normally running appliances. The battery charger alone draws considerable power if the batteries are low or weak. Advertisements are not to be taken as real life activity. To really know what a generator can do takes some real life calculations. The one thing generators manufacturers leave out of their spec's is power factor which is as important as max and running power. For example compare Onan, Yamaha, Honda and Champion power factors and you will see a clear difference. Unfortunately, I am not aware that either of them publish that specification. However, you can get a sense by comparing Horse Power and displacement of the engine. But you still will not get to the apparent power that is available from the power grid at the campground. The bottom line is: don't over expect from a generator. They are good for what they are design for-- emergency power.

 

[carl.swoyer]

Well!!!
Pulled into O'leno State Park in Florida, 95° and 30 amp service. I decided to fire the Onan to run both 15 k AC units. While sitting outside enjoying the camping environment that dreaded Onan shut down occurred.
Code 33 and 13 service & under voltage . Great ! But at least I was able to get an appointment with Tampa Cummins Onan.
Anyone ever get a code 13/33


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Update !
While reading everyone's responses I realized that my Frig was on auto so it toggled to AC. I normally would have it on propane. But there's more, my Magnum Inverter ms2812 was set to a 90% charge rate and also set to 50 amp shore power so it went into a bulk charge. I'm possibly getting forgetful. But thanks for all your help. I'm going to have to tie a string to something.

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[Alan_B]

Update !
While reading everyone's responses I realized that my Frig was on auto so it toggled to AC. I normally would have it on propane. But there's more, my Magnum Inverter ms2812 was set to a 90% charge rate and also set to 50 amp shore power so it went into a bulk charge...

Did that fix the issue?

 

[carl.swoyer]

Yes it did

Did that fix the issue?

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