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Old 09-02-2020, 09:01 PM   #1
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Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 358
THOR #13399
50amp to 30amp

I have 50amp coach if only 30amp is available other than an adapter plug, will I need to do anything different,like manually turn air conditioners off on so both don't try to run or will system see 30amp and take care of itself . 2019 Thor Challenger
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Old 09-02-2020, 09:17 PM   #2
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Brand: Thor Motor Coach
Model: Freedom Elite FE22
State: Oregon
Posts: 15
THOR #19474
If the 30 amp source experiences excess draw it will probably kick off a breaker and go dead (thank goodness).


Your 50 amp unit can handle a 50 amp draw, but doesn't know that the power outlet cannot.


So, turn off whatever would result in an excessive aggregate current draw.
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Old 09-02-2020, 09:51 PM   #3
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Brand: Thor Motor Coach
Model: Aria 3401
State: Arkansas
Posts: 114
THOR #12542
If your coach has a multiplex system like a Firefly, then there is a good chance that it'll manage total power draw by a process called load shedding.

Our Firefly supposedly has it, although I haven't explicitly tested it. It can tell when we're plugged into something other than 50A, and I can then set it for 15A, 20A, or 30A as appropriate.
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Old 09-02-2020, 10:26 PM   #4
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 2,249
THOR #6411
Quote:
Originally Posted by jtyphoid View Post
If your coach has a multiplex system like a Firefly, then there is a good chance that it'll manage total power draw by a process called load shedding.

Our Firefly supposedly has it, although I haven't explicitly tested it. It can tell when we're plugged into something other than 50A, and I can then set it for 15A, 20A, or 30A as appropriate.
Most load shedding systems monitor the coach's inputs to the power center for split phase on the L1 and L2 legs. If there is only phase; then it assumes it is on a 30 amp circuit, but there are manual options for a 15 and 20 amp circuits. It is built into the power center and can be controlled remotely in most systems.
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Old 09-02-2020, 11:26 PM   #5
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Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 358
THOR #13399
Thanks for the quick response we do have fire fly system,I figured it would self manage just nice to verify.
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Old 09-04-2020, 04:40 AM   #6
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Brand: Thor Motor Coach
Model: XG 32 Omni
State: Missouri
Posts: 237
THOR #4243
I tried an experiment with our rig, 50 amp,firefly and 2 a/c units. I was only hooked up to 30 amp and had 1 a/c running and nothing else. Looked at the usage meter and it was good on voltage so I decided to see if it would run both a/c's. turned on the other a/c on the tablet, the system shut off the one that was running and turned on the the other a/c unit. Pretty smart system.
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Old 09-04-2020, 01:28 PM   #7
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Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 358
THOR #13399
Thanks that's what I thought, guess I'll find out in 2 weeks,camping at the finish line at Virginia Motorsports Park dragstrip .
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