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Old 09-17-2014, 04:19 AM   #1
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Shoreline Tripping A/C Circuit Breakers

Whenever I connect our rig to the shoreline to run the A/C it trips the A/C circuit breakers. (Works fine while on generator power)

Amperage is around 20-22 while on shoreline and 15-17 on generator power.

Called Airstream and Dometic.

Still couldn't figure out what's wrong.
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Old 09-17-2014, 05:46 AM   #2
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Are you plugging into a 30 amp service?
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Old 09-17-2014, 05:48 AM   #3
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Since I seem to be an expert at stating the obvious, please allow me to state the obvious…

The problem may be at the shore power pedestal rather than in the Airstream. Check that connections are tight, dry, and of the correct polarity.
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Old 09-17-2014, 06:35 AM   #4
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Quote:
Originally Posted by S3d View Post
Whenever I connect our rig to the shoreline to run the A/C it trips the A/C circuit breakers. (Works fine while on generator power)

Amperage is around 20-22 while on shoreline and 15-17 on generator power.

Called Airstream and Dometic.

Still couldn't figure out what's wrong.
You've stated the problem in your post. "Amperage is around 20-22 while on shoreline". The breaker on the A/C is 20 amps, and it is doing just what it was designed to do. You most likely have low voltage which causes the current demand to go up.

A lot of people don't understand these appliances don't run on voltage, and the don't run on amps, they run on watts. Watts are determined by multiplying the volts by the amps, so if the volts go down below rated 120, the amps must go up to supply the appliance the needed watts to run.
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Old 09-17-2014, 06:51 AM   #5
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You've stated the problem in your post. "Amperage is around 20-22 while on shoreline". The breaker on the A/C is 20 amps, and it is doing just what it was designed to do. You most likely have low voltage which causes the current demand to go up.

A lot of people don't understand these appliances don't run on voltage, and the don't run on amps, they run on watts. Watts are determined by multiplying the volts by the amps, so if the volts go down below rated 120, the amps must go up to supply the appliance the needed watts to run.
Voltage coming in is 118-120. According to Airstream, anything above 110 should be fine.

Shoreline is wired for 30 amps
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Old 09-17-2014, 07:05 AM   #6
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S3d, I see your listing shows Kuwait. Is that where its plugged in? Has it worked before at that electrical outlet? Also affecting electrical appliances is the cycles per second of the AC current. Do you know if you are receiving 60 cycle/second? Some European countries use 50 cycles and that also has an effect on devices, especially motors, that are built to operate on 60 cycles.

I'd also make sure the electrical connections in the outlet box are tight. Make sure the power to the outlet is turned off before checking it.

Also circuit breakers are known to go bad. Does the breaker that is tripping get very warm? That would indicate an overload causing it to trip.
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Old 09-17-2014, 07:12 AM   #7
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How long does the a/c run before it throws the breaker?

From your description so far I say you have a problem between your home circuit breaker box and your rv circuit breaker box.

If it will run long enough you will need to look for what is getting hot. Losing that much electricity, SOMETHING IS getting hot.

Are you running off an extension cord? Is it properly sized?
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Old 09-17-2014, 09:07 AM   #8
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S3d, I see your listing shows Kuwait. Is that where its plugged in? Has it worked before at that electrical outlet? Also affecting electrical appliances is the cycles per second of the AC current. Do you know if you are receiving 60 cycle/second? Some European countries use 50 cycles and that also has an effect on devices, especially motors, that are built to operate on 60 cycles.

I'd also make sure the electrical connections in the outlet box are tight. Make sure the power to the outlet is turned off before checking it.

Also circuit breakers are known to go bad. Does the breaker that is tripping get very warm? That would indicate an overload causing it to trip.
No idea if it is 60 or 50.

I bought a 5000W 240/120 converter and had an electrician wire the converter to our main circuit board with a 30 amp switch.
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Old 09-17-2014, 09:11 AM   #9
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How long does the a/c run before it throws the breaker?

From your description so far I say you have a problem between your home circuit breaker box and your rv circuit breaker box.

If it will run long enough you will need to look for what is getting hot. Losing that much electricity, SOMETHING IS getting hot.

Are you running off an extension cord? Is it properly sized?
30 to 45 mins. Sometimes 15!

No extension cord. A 30 amp plug straight to our main switch board.

The A/C's circuit breakers tend to get pretty warm during those few mins. Also, fan speed is noticeably slower than when on generator power.
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Old 09-17-2014, 09:14 AM   #10
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Check the voltage in your trailer while the A/C is on, my guess is that it is going to be way low.

Something is restricting power. Again, check for hot components, maybe the transfer switch?
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Old 09-17-2014, 09:18 AM   #11
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First thing I would try is plugging it in somewhere else.
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Old 09-17-2014, 09:21 AM   #12
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Good call Ron. That will be a huge tell.
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Old 09-17-2014, 09:39 AM   #13
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I have a post under electrical(no AC power). After 3 trips, we might have found it. "pinched/shorted DC power wire at load center. The RED wire had burnt through the insulation and was shorted at the wire clamp as it enters a junction box. Also had a weak gfi as it tripped when some load applied. This did NOT happen all the time. It took much multimeter time to find it.
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Old 09-17-2014, 10:08 AM   #14
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No idea if it is 60 or 50.

I bought a 5000W 240/120 converter and had an electrician wire the converter to our main circuit board with a 30 amp switch.

If you are not in USA/Canada you could be on 50 Hz power and that would explain difference in current draw between shore power and your generator.


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