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Old 04-21-2016, 05:59 PM   #15
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Your math is correct.

Yes, you should have a "high output" alternator capable of the extra 25 amps, on top of the load to run your MH.

If your house batteries are low, when you get underway, you may be pushing the limits.
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Old 04-22-2016, 08:11 AM   #16
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Originally Posted by Rorytug View Post
perhaps I'm not understanding the thread. Although the coach model and other specifications are not mentioned, you do mention that the refrigerator runs on propane which would indicate it is and absorption unit. I am unaware of any absorption refrigerator equipped coach where the power outlet to run said refrigerator on AC power is wired to the inverter. At least not from the factory. If you put the refrigerator on auto and disconnect the shore power it will automatically revert to LP regardless of whether or not the inverter is on. I have wished on many occasion that I could run my refrigerator on the inverter to save on the propane but it's not happening. Am I wrong or are there coaches out there with George and refrigerators that are wired to the inverter?
Our Bus has two 110 acv receptacles behind the outside frig access panel. One is wired to house power (shore or genset) the other is powered by the 2000w inverter. Plug frig into which system you choice. Ice maker may be using the inverter outlet as well. If your coach isn't wired like this, not a big deal to run a new outlet off inverter with correct circuit breaker. As for the 110 amp draw, our four door Norcold manual lists two heaters @ 5.8 amp @ 110vac, which will take 50 amps dc to invert. I've been told and agree that absorption frigs work better on gas mod. Lower operating temps in same locations and OAT.
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Old 04-22-2016, 12:28 PM   #17
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My refrigerator does not run on the inverter. However, the ice maker does.
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Old 04-23-2016, 11:36 AM   #18
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That explains it.

Tony, that makes perfect sense! I even checked mine after this thread and it did not run on inverter. I can see why the ice maker would. My power panel shows a 2amp draw on shore power from the fridge. I think that equates to a 220 watt draw on the inverter? I had my ice maker removed because it took up too much space in my 9cuft so if I swap the outlet it is plugged into, it should run on my 1000 inverter when going down the road? Is this one of those "I swear to God, on paper, it was a great idea" moments? what am I missing. Often, the flame on propane blows out in heavy crosswinds or I could use it as a temp backup if the gas side ever experiences a problem. Hate to hijack a thread but interested in the feedback.
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Old 04-23-2016, 01:27 PM   #19
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How often does the flame blow out ? I haven't seen it. Maybe it just re-lights.
What about when the wind blows, while parked ?
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Old 04-24-2016, 12:53 PM   #20
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It has happened two or three times over the years. My fridge vents out the side, maybe that has something to do with it. It doesn't relight and I can't hear the alarm while underway so at next stop, I turn it off, back on and it relights. It never does it parked, only underway in strong cross winds.
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Old 04-24-2016, 01:08 PM   #21
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In our coach the refrigerator and ice maker plugs share the only outlet in the compartment behind the refrigerator. Both on the inverter.

Running the refrigerator on inverter vs propane has nothing to do with saving propane in our case. As you correctly point out that is a small amount. We turn off our propane while traveling more for safety. Although the threat is low having the propane off when moving reduces the chance of a fire on the coach igniting and being fueled by propane being sent through the lines if a fire should start while moving. It therefore increases the time to safely exit the coach if necessary.

Fulltiming in a 2012 Newmar Ventana LE 3634
Propane tanks incorporate a high flow shut off valve. If a line is broken the flow is automatically shut down.
Having the propane on is no more dangerous in an RV than it is for a propane powered vehicle.
The system is designed, installed, tested and certified to be on while moving.
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