I am curious as to how much propane the generators use per hour and how electricity they generate. Also with a 50 amp service if you have the 3rd A.C. unit what else can you run in the trailer? Seems like you would be at a risk of overload if you were cooking or running a coffee pot. Am I missing something. Never owned anything like this before and I am a little confused
LP generator and 3rd A.C. unit
- Thread starter LarryL
- Start date
danemayer
Well-known member
Hi LarryL,
Since you posted in the Landmark-Prospective Owners sub-forum, let me assume you're looking at a Landmark 365.
The optional Onan 5500 LP generator that you can order from the factory should have two output legs of 3,600 watts @ 120V, or 30 amps each. Fuel consumption varies depending on how much power is being consumed. See the attached table.
If you do have a Landmark 365, it comes with a Power Control System that manages the available power, shedding loads as necessary so that you don't exceed the available power. It automatically senses when running on the generator and adjusts accordingly. Depending on what else is using power, you may be able to run 3 A/C units at the same time when on the generator.
You can read more about this in our owner-written Landmark 365 User Guide.
Since you posted in the Landmark-Prospective Owners sub-forum, let me assume you're looking at a Landmark 365.
The optional Onan 5500 LP generator that you can order from the factory should have two output legs of 3,600 watts @ 120V, or 30 amps each. Fuel consumption varies depending on how much power is being consumed. See the attached table.
If you do have a Landmark 365, it comes with a Power Control System that manages the available power, shedding loads as necessary so that you don't exceed the available power. It automatically senses when running on the generator and adjusts accordingly. Depending on what else is using power, you may be able to run 3 A/C units at the same time when on the generator.
You can read more about this in our owner-written Landmark 365 User Guide.
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Jesstruckn/Jesstalkn
Well-known member
Mine will only run 2 AC's on Gen power 1 on L-1 & 1 on L-2 legs if you try to kick on the 3rd AC it will pop the breaker on the front of the Gen
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danemayer
Well-known member
Interesting Jerrod. The PCS system is supposed to sense the generator, by way of the hours meter, and adjust total available amps. Sounds like yours is not sensing the generator and thinks you still have 12,000 watts available. Or perhaps it's programmed, as in this screen capture, to think the generator provides more than 30 amps on each leg.
Maybe check the panel on yours next time the generator is supplying power.
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Jesstruckn/Jesstalkn
Well-known member
My gen has that one 20amp breaker (not factory installed) 
I think that where my problem is.
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I think that where my problem is. 
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Jesstruckn/Jesstalkn
Well-known member
Ya if I would have known this when we ordered it I would have the 30-30 right now. LOL but that goes for a lot of things I've learned over the last 11 months. :/
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You can swap the 20 amp breaker for a 30 amp. This what Cummins did when I had them install my generator. They make two models one is the 30/20 and one is 30/30. According to Cummins, the ONLY difference is the one breaker. Mine has been in for 6 months and not an issue and I can run all three A/C units off the generator. Hope this helps.
Shawn
Shawn
Jesstruckn/Jesstalkn
Well-known member
Sknoch:
Thanks for that info I'll call Onan and order a 30amp breaker today. I knew I could replace the 20 with a 30 but I didn't know Onan would be OK with that.
If your able to run all 3 AC's with no problems then I guess I'll do the same thing.
Thanks for you post.
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Jesstruckn/Jesstalkn
Well-known member
I did a Google search and found Cummins North West
I ordered the 30amp breaker should have it in a few days Thanks for that info.
Here's the Part number 320-1323. The price on the breaker is $37.96
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I ordered the 30amp breaker should have it in a few days Thanks for that info.
Here's the Part number 320-1323. The price on the breaker is $37.96
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avvidclif
Well-known member
Interesting that the only difference is the breaker, makes you wonder WHY??????
On a side note last weekend we dry camped and ran the generator a total of 27 hours out of 43 hrs camping. Burned 7.7 gal of gas. Some A/C but mostly water heater and coffee pot. A little microwave. Just normal usage. And the breathing stuff at night(required)..
I can live with that.
On a side note last weekend we dry camped and ran the generator a total of 27 hours out of 43 hrs camping. Burned 7.7 gal of gas. Some A/C but mostly water heater and coffee pot. A little microwave. Just normal usage. And the breathing stuff at night(required)..
I can live with that.
Jesstruckn/Jesstalkn
Well-known member
That's a little over a 1/4 gallon an hour not to bad. I've heard our LP gen uses a lot more.
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rxbristol
Well-known member
Your chart is interesting because I have one that states the generator uses .75 gallons of propane under full load.
avvidclif
Well-known member
Kinda hard to tell with LP but start with a full gas tank and fill when done. Look at the hours, makes it easy. I know LP uses more but I don't think it's that much more. LP is better for storage
Jesstruckn/Jesstalkn
Well-known member
Well my new 30amp breaker came today.
Took me about 10 minutes to replace it.
Now I have 2 - 30amp and can run all 3 AC's.
The wires on the back of the 20amp (top) were exactly the same as the ones on the 30amp (bottom) so no worries of overloading the wires.
I even properly labelled it.
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Took me about 10 minutes to replace it.
Now I have 2 - 30amp and can run all 3 AC's.
The wires on the back of the 20amp (top) were exactly the same as the ones on the 30amp (bottom) so no worries of overloading the wires.
I even properly labelled it.
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jdamude
Well-known member
I have a 5500 LP unit that I'm installing in my 4010RD Big Country. The Load wires coming out of the generator are only 12 gage. Why are the wires sized so small for a 50 Amp service? The wiring charts show a 6 gage wire size for 50 Amps.
Thanks
Jeff
danemayer
Well-known member
The 5500 has 2 circuit breakers on the unit. Neither one is 50 amps. At least one should be 30 amps and the other might be 30 amps, or might be 20 amps.
Most wire gauge tables would show 10 gauge wire for a 30 amp circuit, but some of the more complex tables show applications where 12 gauge might be appropriate. I'm not a licensed electrician and don't know the electrical codes, so I can't say whether 12 gauge is appropriate or not.
But unlike your shore power, neither generator wire is carrying 50 amps.
Most wire gauge tables would show 10 gauge wire for a 30 amp circuit, but some of the more complex tables show applications where 12 gauge might be appropriate. I'm not a licensed electrician and don't know the electrical codes, so I can't say whether 12 gauge is appropriate or not.
But unlike your shore power, neither generator wire is carrying 50 amps.
jdamude
Well-known member
Thanks. Seems odd that you feed the transfer switch with the 12 gage and all the rest of the wiring is 6 gage.
danemayer
Well-known member
Well, there's a junction box that the generator ties into. On my factory-installed Onan, the wires between that junction box and the transfer switch are 6 gauge. I don't know what's coming out of the generator as it goes to the junction box.
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