2 15k AC's and amperage question

[Da Bud Man]

Question of the day.

What does it take to run 2 15k AC's with generator power?

Can 2 Honda 2000i's paralleled run 2 15k ac's if everything else is running on propane?

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[imjustdave]

You will need to measure the load on shore power and or look at ac specs sheet to obtain the amperage. I'm willing to bet start up power will be too much especially at the same time. But every device works differently so you really need to see real world loads on your setup. Also generator can vary too and if you want 2 a.c. it's going to be hot outside and that can impact the performance as well. I would rather have a 5k generator at 75% then 2 2k units at max. Don't forget the battery charger is a load that is just there no lp option. With out spec sheets on the a.c. units or real measurements we are really guessing

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[Magnolia Tom]

Doubtful. 2 Honda 2000i's will run one AC, not both. You'd need at least 6000 watts of generator power to run both.

Use this formula:

Amps=watts/volts

4000watts/120 volts is 33 amps

Dual ac system rigs have 50 amp service. So, use the formula

50 amps= watts/120
Watts = 6000

Sorry for the math


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[imjustdave]

https://www.airxcel.com/coleman-mach...rofile/mach-15

Just picked a random unit.... first page say a few different values and if you look at pdf gives you more values. I'm sure all are based off different voltages. Could you run it.. in perfect conditions maybe but doubtful. Real world even less. So I looked up the generator. Looks like it's a 1600 watt rated generator capable of 2000 watts max. No mention of period of 2k power but that is epic max and usually consider spike loads So that pretty much kills your idea sorry. Looks like marketing selling it vs engineering.


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[3'senough]

You might get it going, but one line of 120V only which could lead to a fire hazard due to the wire ratings between the genny/adapter gauge.

Just run one at a time. I kick the breaker off on the one I don't want running so no one puts it on by mistake.

[Mopar_Earl]

5kw rated+ depending how much else you want to run. I have ran both my units with everything else off on a 5.2kw.

Higher you are above sea level will lower the output of the genset. So you will need to figure that in as well.

I now have an onboard Onan 5.5kw rated and it runs both ac units, RV fridge on electric and the converter on high output. Also the TV.

Be careful of rated versus max output. Honda advertises max output and not rated. Max output isn't what you want to rate your genset by!! Max output is for short very bursts, like a motor load start up.


Earl

[bdreinv]

According to AC manufacturer one 15K takes 2900 watts to start! Have attached camper loads from Jayco for 12volt and 120volt for my Eagle camper!

[Mopar_Earl]

Originally Posted by bdreinv

According to AC manufacturer one 15K takes 2900 watts to start! Have attached camper loads from Jayco for 12volt and 120volt for my Eagle camper!

Yes, it's a motor load. But that's only a brief load. That's why gensets have a rated and surge/max output ratings.


Earl

[bdreinv]

Thanks me an electricity have never got along! LOL

[Da Bud Man]

Thanks for the replies. I didn't think it was possible, but figured I would ask.

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[1stnlast59]

I've read one here somewhere about a soft start thing that's wired into the a/c that allows it to be started with minimal amps. The website I looked up about it was saying that u could run a rooftop a/c on a 2000 watt Honda no problem. I'll look and find the link.

[1stnlast59]

https://www.microair.net/products/ea...nt=30176048267

[wags999]

Originally Posted by Magnolia Tom

Doubtful. 2 Honda 2000i's will run one AC, not both. You'd need at least 6000 watts of generator power to run both.

Use this formula:

Amps=watts/volts

4000watts/120 volts is 33 amps

Dual ac system rigs have 50 amp service. So, use the formula

50 amps= watts/120
Watts = 6000

Sorry for the math


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Dual systems have 50 amps at 240 volts or 100 amps at 120 volts...12000 watts available. 2000 watts at 120 is 16.66 amps..doubtful you could run an AC with only 2000 watts of power, let alone typical running watts of 1500 to 1600..

Good Luck....