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Old 07-22-2016, 09:14 PM   #1
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Hard Start Capacitors for AC

I just brought a Supco SPP6 to hopefully make starting my 15K BTU Air Conditioner with my 2 Yamaha EF2000iS running in parallel. When travelling, we spend nights in wallymart parking lots and it is nice to have the AC going when it is hot outside.
Trailer is a 2016 28BHBE

Question is, Will this help a lot or just a little? Also, will it also keep from drawing as much current when hooked up to the Electrical Pedestal at campgrounds?

What are your experiences with these hard start capacitors? Are they worth having?

Thank you
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Old 07-22-2016, 09:22 PM   #2
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The hard start capacitor is simply to aid the AC on startup. It won't reduce the running the current. The AC will start quicker. High start current draw will be of shorter duration. It wil help out especially if the campground voltage is low.
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Old 07-23-2016, 07:15 AM   #3
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I'm a HVAC tech, so I deal with these all the time. I usually use these if you have a compressor doesn't start running on initial startup (the compressor just buzzes and pulls locked rotor amps). If there is any saving it the hard start capacitor increases the compressors torque 500%. If the compressor starts running your ok, if not its done. They also help if the compressor short cycles which means the AC unit reaches setpoint and turns off then starts up again before the refrigerant pressures equalize.

If the head pressure is still high after reaching setpoint the compressor can have trouble starting against the high head pressure and pull locked rotor. The hard start capacitors increased torque helps get it running again.

For a normally running compressor I can see it working well on shore power starting a little quicker, but I don't think a generator can respond quickly enough if there is an issue with the compressor.

Hope that helps. Let me know if you have any other questions.
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Old 07-23-2016, 07:54 AM   #4
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Has anyone added a capacitor to a residential fridge in their RV? I have on in my houseboat [RV on water] and it pulls a brief light dimming amp load when the compressor cycles on. I have been told that the draw from the 110 fridge compressor is significant but like an AC unit its amp draw is fairly low once it running.
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Old 07-23-2016, 08:43 AM   #5
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Quote:
Originally Posted by RAurand View Post
I just brought a Supco SPP6 to hopefully make starting my 15K BTU Air Conditioner with my 2 Yamaha EF2000iS running in parallel. When travelling, we spend nights in wallymart parking lots and it is nice to have the AC going when it is hot outside.
Trailer is a 2016 28BHBE

Question is, Will this help a lot or just a little? Also, will it also keep from drawing as much current when hooked up to the Electrical Pedestal at campgrounds?

What are your experiences with these hard start capacitors? Are they worth having?

Thank you
I'm surprised you need a hard start cap with those generators. Seems to me they should be able to handle the start load as is. My Honda 3000 starts and runs my 15K just fine with no modifications and you have 33% more generator capacity.
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Old 07-23-2016, 08:59 AM   #6
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Originally Posted by Hohenwald48 View Post
I'm surprised you need a hard start cap with those generators. Seems to me they should be able to handle the start load as is. My Honda 3000 starts and runs my 15K just fine with no modifications and you have 33% more generator capacity.
Agree, I have no problems running my 1500 AC on my 2014 whitehawk with my 2000's running in parallel.

My question about the fridge on my houseboat relates to running a small portable AC AND my 10cf residential fridge with just one H 2000. The single 2000 will easily run the small AC but the genny will not handle the AC and the start up load when the fridge cycles on.
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Old 07-23-2016, 09:03 AM   #7
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I think it's a good idea to have a hard start capacitor on the AC, regardless of the output of the generator. We mostly camp where we have hookups, so this isn't really a consideration for us. However, I've found that in borderline voltage situations, the AC seems to start much better with a hard start capacitor installed.
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Old 07-23-2016, 09:18 AM   #8
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I have the two Yamaha EF2000iS as stated by the OP and they run my 15K BTU AC just fine in the normal run mode. However I overnighted in a Walmart once and the generators in the "eco mode" was not able to start up the AC. I had to run them in the normal full load mode.

I was thinking about installing a hard start capacitor to see if this would allow the Yamaha EF2000iS (parallel) in the "eco mode" to allow the AC to run.
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Old 07-23-2016, 10:13 AM   #9
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I am surprised that most modern day RV AC's don't come with hard start capacitors from the factory since using a generator occasionally is fairly common in the RV world.
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Old 07-23-2016, 12:16 PM   #10
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Quote:
Originally Posted by Sunflake View Post
I'm a HVAC tech, so I deal with these all the time. I usually use these if you have a compressor doesn't start running on initial startup (the compressor just buzzes and pulls locked rotor amps). If there is any saving it the hard start capacitor increases the compressors torque 500%. If the compressor starts running your ok, if not its done. They also help if the compressor short cycles which means the AC unit reaches setpoint and turns off then starts up again before the refrigerant pressures equalize.

If the head pressure is still high after reaching setpoint the compressor can have trouble starting against the high head pressure and pull locked rotor. The hard start capacitors increased torque helps get it running again.

For a normally running compressor I can see it working well on shore power starting a little quicker, but I don't think a generator can respond quickly enough if there is an issue with the compressor.

Hope that helps. Let me know if you have any other questions.
It's a new trailer and I do not have any issues, I just want to make the AC starting up easier on the generator.
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