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Old 06-11-2016, 01:34 PM   #1
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Shore power power not providing power to air conditioner

Shows 50 amp until you turn on one air conditioner, then starts jumping. Generator work a evrything just fine.
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Old 06-11-2016, 02:09 PM   #2
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You should start at the source. Check the voltage at the power post. Has this been working fine previously on this power source?
Do you have a power protection device like a surge guard or progressive unit? If not, I would not use that power source until you confirm it is producing correct power levels, grounds and neutral wired correctly.
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Old 06-11-2016, 02:21 PM   #3
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Originally Posted by jjhenley View Post
Shows 50 amp until you turn on one air conditioner, then starts jumping. Generator work a evrything just fine.

It really sounds like an open or floating neutral. Very dangerous to equipment. It would unplug until it's checked.
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Old 06-20-2016, 06:57 PM   #4
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It really sounds like an open or floating neutral. Very dangerous to equipment. It would unplug until it's checked.
Do you think it could be the inverter going out. Seems this is the initial thought of the service mgr. when I told him the circumstances, he has not seen it yet since it is visiting the mechanic at the moment.
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Old 06-20-2016, 07:26 PM   #5
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Do you think it could be the inverter going out. Seems this is the initial thought of the service mgr. when I told him the circumstances, he has not seen it yet since it is visiting the mechanic at the moment.

The A/C isn't powered through the inverter. Also all works fine on generator power. I think it's an issue with shore power. Where are you seeing voltage jumping around? If it really is fluctuating and not just a monitor problem, it's dangerous to equipment. A Progressive type EMS can tell you for sure.
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Old 06-20-2016, 08:53 PM   #6
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Loose connections/wiring? Start at the circuit breakers.
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Old 06-21-2016, 09:08 AM   #7
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Loose connections/wiring? Start at the circuit breakers.
Agree, unplug the shore power, do not run the generator, and check all terminals on the incoming power line. From the transfer switch on. Also inspect the plug on your cord for burnt prongs.
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