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Old 02-05-2023, 08:26 AM   #1
T53
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Shore power issue

Unit has a victron multipluss inverter/charger. Problem is that the AC shore power 50amp breaker will occasionally trip. Trips usually when no power is being drawn except a 1500watt plug in heater that has been running constantly. Inverter is set to allow 50amps in and in “on” mode. Has on ,off, inverter, or charge mode. Any thoughts other than bad breaker that causes trip when not much draw ?
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Old 02-05-2023, 08:33 AM   #2
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Howdy neighbor.

Is the 50 amp shore power outlet a GFI outlet by any chance? If so GFI shore power outlets and many RV's don't mix well.
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Old 02-05-2023, 08:42 AM   #3
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Why yes it is. ��
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Old 02-05-2023, 08:47 AM   #4
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Currently living in rv while house is being built. Subpanel is 100 amp and not at park or campground. I could change out since rv has gfci correct ?
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Old 02-05-2023, 08:52 AM   #5
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Quote:
Originally Posted by T53 View Post
Unit has a victron multipluss inverter/charger. Problem is that the AC shore power 50amp breaker will occasionally trip. Trips usually when no power is being drawn except a 1500watt plug in heater that has been running constantly. Inverter is set to allow 50amps in and in “on” mode. Has on ,off, inverter, or charge mode. Any thoughts other than bad breaker that causes trip when not much draw ?
Assuming the 50 amp shore power breaker is the one you plug your RV shore power cord into, then a 1500 amp heater will not trip it.

Defective 50 amp breaker
Drawing too much power
It is unlikely a 50 amp 240 volt breaker also has a GFCI

There are other possible high current devices that may be drawing power in the RV.
Electric Water Heater
Heat pumps
Heat strips in A/C
Block heater
Electric furnace
Microwave
Electric coffee pot
Some combination of these on one side of the 240 volt split phase could cause the main breaker to trip intermittently.

Other failures:
Short circuits in cords or plugs
Short circuits in RV wiring
Short circuits in transfer switch
Short circuits in main circuit breaker box
Worn or burned insulation on wires is often the cause
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Old 02-05-2023, 09:09 AM   #6
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Main breaker has test button and pigtail. Confident it is a gfci. With that said, it trips fairly randomly. Last night at 2am tripped with only frig n wall heater going.
Going to swap out with non gfci breaker and see.
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Old 02-05-2023, 09:16 AM   #7
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This is the breaker
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Old 02-05-2023, 09:19 AM   #8
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Currently living in rv while house is being built. Subpanel is 100 amp and not at park or campground. I could change out since rv has gfci correct ?
Can you? Yes, it's physically possible. The current Code requires GFCI protection.

There is no inherent reason that RVs should not play well with GFCIs - mostly the problems occur when there are multiple, current-leaking devices, or defective wiring installation in the RV. IOW, the device is doing what it supposed to do - disconnect when a potentially unsafe condition is detected.

Any advice given to remove the GFCI is up to the owner to accept or reject, but I personally err on the side of safety.
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Old 02-05-2023, 09:48 AM   #9
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Ok so im not an electrical expert but shouldnt the pigtail from gfci breaker go to white, common bus bar ? See pic
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Old 02-05-2023, 09:49 AM   #10
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Pic
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Old 02-05-2023, 09:59 AM   #11
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Sorry. Think I answered my own question. This is a main panel which has both common n ground connected. Sorry
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Old 02-05-2023, 10:03 AM   #12
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Sorry. Think I answered my own question. This is a main panel which has both common n ground connected. Sorry
Yep. If this is the first point of disconnect after the meter, the ground and neutral are bonded. If this were a sub-panel, it would be a violation.
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Old 02-05-2023, 10:13 AM   #13
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Can you? Yes, it's physically possible. The current Code requires GFCI protection.

There is no inherent reason that RVs should not play well with GFCIs - mostly the problems occur when there are multiple, current-leaking devices, or defective wiring installation in the RV. IOW, the device is doing what it supposed to do - disconnect when a potentially unsafe condition is detected.

Any advice given to remove the GFCI is up to the owner to accept or reject, but I personally err on the side of safety.
Current code where? Please stop with this. The nec is not adopted everywhere.
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Old 02-05-2023, 10:33 AM   #14
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I suggest you check the inverter. The AC in and AC out wires. Start by running that heater and see if any of the wires are warmer than they should be. Those connections need to be totally solid any loose connections cause resistance. Don't ask me how I know this. Also in my rig the inverter is "in line" and essentially has to be running when on shore power, but it notices and goes into bypass mode. The other quirk is they wired one whole inverter AC out to just the microwave. So that leaves the other AC out for outlets. 1500 watt space heaters could absolutely cause this behavior particularly if that circuit is being shared like for example with another power suck like a coffee pot. Those heaters are notorious for power draw. On a side note I am rewiring the microwave outlet so I can use it when the microwave is not in use which is like 99.9% of the time.
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