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Old 02-01-2017, 09:44 PM   #1
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Hard start capacitor

Could someone explain the addition of a hard start capacitor to a Dometic 13,500 A/C? Is it an add on, or a replacement for a current one? Can anyone point me to installation instructions? To an amazon link to purchase one? I'm not sure I even need one but thought it might help when much unit sometimes fails to start.
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Old 02-01-2017, 09:47 PM   #2
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Old 02-01-2017, 10:12 PM   #3
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https://id144248.webhosting.optonlin...&products_id=4

Much better than a simple start capacitor
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Old 02-01-2017, 10:40 PM   #4
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http://s3.supplyhouse.com/product_fi...t-Overview.pdf

These start capacitors work by providing the increased voltage stabilization during the initial seconds of the compressor and fan motor start up (Locked Rotor Amperage draw). This momentary high current demand can drop the voltage causing the motors to stall tripping breakers, thermal fuses, and damaging windings.

Paralleling another much larger capacitor in the circuit can ease the initial load allowing generators and weak campground circuits to keep up with the startup demands. They are additive to the capacitor that is already there.

Find the Running Amperage rating of your unit (in the bottom photo it will be the 11.9 amps of the compressor plus the 3.4 amps of the fan motor) and convert to watts by multiplying by 115 volts; then use this calculator to determine the horsepower of your air conditioner.

Watts to horsepower (hp) conversion calculator

(In this case 2.4 HP)

Then buy the correct sized capacitor for your unit (In this case the SPP6E would work just fine).
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Old 02-01-2017, 10:56 PM   #5
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To help with my generator I also added a delay relay to start the compressor first and then the fan motor 2 seconds later.

The relay goes between the thermostat and the compressor control board on the fan speed wire.

Since the control voltage on our thermostats is low (12 - 24 volts), leave the jumper intact.
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Old 02-01-2017, 11:23 PM   #6
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Quote:
Originally Posted by Ale_Brewer View Post
https://id144248.webhosting.optonlin...&products_id=4

Much better than a simple start capacitor
x2
While significantly more expensive than a start capacitor, this is the option I will probably go with. Impressive is the number of people who say they can run their AC with one 2k generator after installing one of these.
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Old 02-02-2017, 07:34 AM   #7
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Here, thanks for the detailed explanation. I will study your info closely.
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Old 02-02-2017, 10:43 AM   #8
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I emailed with them. Extensive testing with 2k generators. I think I'm going to get one.
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Old 02-10-2017, 01:39 PM   #9
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The Suppco6(Suppco rep does not suggest "E") that Herk referred to is $10-$12. It can be an addition or piggybacked to what you already have. I think I would try that before spending $318. on the other linked soft start unit.
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Old 02-10-2017, 01:54 PM   #10
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If you are still interested in a hard start capacitor here is a video that should help.
Also a link to one to buy on Amazon.

Supco SPP6 on Amazon

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Old 02-10-2017, 02:44 PM   #11
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I posted pics of my hard start cap install on 13.5 unithere... it is an add-on

http://www.forestriverforums.com/for...nit-94386.html

they are cheap to order through Amazon and may just work for you if you have about 15 minutes to do the install.

Does not hurt anything if it does not work before going to another level.
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Old 02-10-2017, 03:06 PM   #12
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This 13,500 only draws 3 amps on start up....Stock.....And, it's 88 out.
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Old 02-10-2017, 03:06 PM   #13
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Quote:
Originally Posted by bob213 View Post
The Suppco6(Suppco rep does not suggest "E") that Herk referred to is $10-$12. It can be an addition or piggybacked to what you already have. I think I would try that before spending $318. on the other linked soft start unit.
Go to the link in post #3, then click on the "Visit this products website" link. Then if you watch the Easy-Start "RV A/C Installation" video on their website, they measured the stock set-up's starting current (about 41.1 amps). Then they hooked up one of these hard start capacitors and measured the starting current. The starting current actually INCREASED (42.1 amps) over the stock set up (41.1 amps). Then they removed the hard start capacitor and installed the Easy-Start and the final starting current (after the 5 "learning starts") dropped 60% (17.3 amps) from the stock setup (41.1 amps). It also allows the blower to start first, then the compressor.
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Old 02-10-2017, 03:49 PM   #14
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Rockfordroo..
That definitely makes the $318 model a worthy consideration.
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Old 02-10-2017, 05:06 PM   #15
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This 13,500 only draws 3 amps on start up....Stock.....And, it's 88 out.
Say what?
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Old 02-10-2017, 05:07 PM   #16
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Didn't studded....Lol....Hold on, I'll take a couple pics..
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Old 02-10-2017, 05:13 PM   #17
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Hav'n camera problems...Reading amp draw off Progressive Surge protector
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Old 02-10-2017, 05:18 PM   #18
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Just tell ya...8 amps before, 11 amps now
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Old 02-10-2017, 05:20 PM   #19
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I'll keep trying with camera...
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Old 02-10-2017, 05:29 PM   #20
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OK. Something goofy going on....Can't run micro wave and A/C....Be look'n further
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