Good Sam Club Open Roads Forum: Tech Issues: AC Hard start additions
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popeyemth

owensboro ky

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Posted: 08/05/21 08:44am Link  |  Quote  |  Print  |  Notify Moderator

Any new developments (in the last couple years) to the problem of starting/running a Dometic 13500 AC unit with a generator?
Thanks,Mike


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vermilye

Oswego, NY, USA

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Posted: 08/05/21 08:49am Link  |  Quote  |  Print  |  Notify Moderator

I don't believe they are within the last two years, but the Micro Air Easy Start is a great solution.

Micro Air Easy Start


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Sandia Man

Rio Rancho, NM

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Posted: 08/05/21 08:51am Link  |  Quote  |  Print  |  Notify Moderator

I don't know of any new developments if indicating 2K watt gennies, we have never had any issues to speak of since we use a 3K watt genny at a minimum for running our RV AC unit, no problems even at higher elevations.

2oldman

NM

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Posted: 08/05/21 09:21am Link  |  Quote  |  Print  |  Notify Moderator

Get more generator.

ktmrfs

Portland, Oregon

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Posted: 08/05/21 10:34am Link  |  Quote  |  Print  |  Notify Moderator

vermilye wrote:

I don't believe they are within the last two years, but the Micro Air Easy Start is a great solution.

Micro Air Easy Start


yup easy start. The only downside is at high altitude (>3500ft or so) a honda 2000 will run out of umph and shut down. A honda 2200 will run a coleman mach III or dometic at 7,000ft+ based on our experience.


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jjrbus

FT Myers FL

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Posted: 08/05/21 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

Rumor has it that some of the new roof air have a hard start installed at the factory. If they are no one is advertising it!

I got some bad info on the net then experimented a bit. I run an 8000 btu window unit with a Honda 2000, added a hard start an run the Honda in ECO mode!

I would have installed a mini split years ago but do not have room for the inside unit.

2oldman

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Posted: 08/05/21 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

good one

* This post was edited 08/05/21 02:03pm by 2oldman *

3 tons

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Posted: 08/05/21 01:53pm Link  |  Quote  |  Print  |  Notify Moderator

Another well founded internet rumor??

3 tons

ktmrfs

Portland, Oregon

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Posted: 08/05/21 03:47pm Link  |  Quote  |  Print  |  Notify Moderator

jjrbus wrote:

Rumor has it that some of the new roof air have a hard start installed at the factory. If they are no one is advertising it!

I got some bad info on the net then experimented a bit. I run an 8000 btu window unit with a Honda 2000, added a hard start an run the Honda in ECO mode!

I would have installed a mini split years ago but do not have room for the inside unit.


a lot of the "hard starts" installed at the factory are the same as what is in the over the counter AC units, a start cap for the compressor. Coleman and dometic sell OEM units w/o any start cap for the compressor. grunt grunt.

If the AC already has a start cap, a "hard start" cap may help some, but likely not much. Even with a hard start cap installed Locked rotor amps is still in the 50A range, well beyond what most 2000VA or so generators can supply for enough time to get the motor running enough to get the back EMF up to the point that the running amps are in the 15A range.

I graphed the start current with a micro air on My Coleman Mach III. PEAK start current is 20A for < 1 second, well within the capability of most 2000VA generators, even in eco mode. It took 3 or 4 of the "start learning cycles" that are called out to get their. Initially peak starting current was 45A w/o the micro air.

philh

Belleville MI

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Posted: 08/05/21 04:04pm Link  |  Quote  |  Print  |  Notify Moderator

microaire easy start

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