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Old 09-01-2018, 12:14 PM   #1
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Predator 3500 at Altitude?

I read through this whole thread. I live at 6200í and camp anywhere from say 4500-10,000í always boondocking. We do a fair amount of high desert boondocking as well. I donít have a generator, but keep going back and fourth between the predator 3500 and the champion 3400 or 3500. I send champion an email and they came back saying at my altitude I would require two 3500s to run my AC because you lose 3.5% per 1000í. Below is the quote from Champions email:
ďNo amount of altitude jetting, etc. will restore this lost power which occurs at 3.5% for every 1,000 ft in elevation you travel. In Cortez, CO you are at about 6,200ft. This is a loss of 21.7%.Ē
Iíve been all over websites and most people say a 3500 will run the AC, but no one mentions altitude.
I would like to run the AC and microwave, but not necessarily at the same time and some of the other nice features of the trailer. I have an 2018 Rpod with a 13,500 BTU AC.
Any experience running the predator and or the champion 3400 at altitude for the AC?
Thanks in advance
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Old 09-01-2018, 12:29 PM   #2
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Any experience running the predator and or the champion 3400 at altitude for the AC?
Thanks in advance
In May I spent a lot of time between 6,000 and 9,000 feet, running my 3500 W Champion "Inverter". Ran fine and started my 13,500 watt AC. Due to the altitude I used the LPG side of my Dual Fuel generator as it automatically adjusts fuel mixture for altitude. Fumbling with jet changing is not required which is great if your trip takes you "Up and Down".

No, no more power, just a cleaner and smoother running engine. Altitude causes gasoline engines to run rich and produce more CO which is why I went with the Dual Fuel model. Propane further reduces the power output but considering that I can start and run my 13,500 btu AC on a 15 amp circuit and off the end of a 50' extension cord, the generator had just enough "oomph" to get it done.

The loss of power is noticeable if batteries are down and under heavy charge. A/C still works fine but if you want to use the microwave then the converter will most likely need to be switched off while doing so.

If you go higher, say above 10,000 feet, The 3500 watt unit will probably run the AC but ONLY the AC.

On a final note, re-jetting won't make the Engine put out more power, it will just let the engine run more efficiently and not load down as if you still had the choke on. Your campground will also have less Carbon Monoxide floating around when properly jetted for the altitude.
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Old 09-01-2018, 12:34 PM   #3
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I have used the Predator 3500 at 10,000 feet and it has no problem running my 15k AC.
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Old 09-01-2018, 08:15 PM   #4
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Old 09-01-2018, 09:08 PM   #5
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I've been eyeballing that predator 3500 lately, and the sale price makes it very tempting!
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Old 09-01-2018, 09:42 PM   #6
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Looks like a couple of companies make dual and tri-fuel carbs for them too..

No reviews from anyone I've seen though.. I wonder how well they work.
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Old 09-01-2018, 10:52 PM   #7
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Thanks for the replies. TM thanks for your insite on running propane at higher attitude. Almost sounds like fuel injection. I know at 10,000’ you very rarely would need AC. Spent a few days around Silverton, CO.at the end of July and camped at 10,500’. Days were low to mid 70s and the nights were a nice cool 36į when I got up at 6:30.
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Old 09-01-2018, 10:57 PM   #8
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Looks like a couple of companies make dual and tri-fuel carbs for them too..

No reviews from anyone I've seen though.. I wonder how well they work.
Would be interesting to see from feedback on this.
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Old 09-03-2018, 07:01 AM   #9
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My brother has the champion 3500. Two weeks ago we did a 5 day trip on our property here in New Mexico, it's at 9,000ft. It ran my a/c fine no issues what so ever didn't even notice if the machine bogged down when the a/c kicked on. All of my camping is boondocking and that is the only time I've turned on our a/c they supposedly check for our annual inspection though. Not sure if it's a 13,500 or a 15,000 but my wife enjoyed it so much she took a 2 hour nap. We didn't try out the microwave.
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Old 09-03-2018, 09:53 AM   #10
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My brother has the champion 3500. Two weeks ago we did a 5 day trip on our property here in New Mexico, it's at 9,000ft. It ran my a/c fine no issues what so ever didn't even notice if the machine bogged down when the a/c kicked on. All of my camping is boondocking and that is the only time I've turned on our a/c they supposedly check for our annual inspection though. Not sure if it's a 13,500 or a 15,000 but my wife enjoyed it so much she took a 2 hour nap. We didn't try out the microwave.
Thatís good to know. Do you if itís the duel fuel Champion? And all our camping is boondocking as well.
Thanks for the reply!
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