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Old 10-07-2013, 06:28 PM   #15
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Thanks all, I was not running ac as it requires the generator or shore power. I have forgotten and left the inverter on and it does pull down the batteries once the engine is turned off. As for running the fridge on gas I could do it but seems like the inverter would be a better avenue.
Based on you having an absorption fridge that runs on propane, I do not understand why you would not run on propane when no shore power is connected, or when your genny is not on.
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Old 10-07-2013, 06:50 PM   #16
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To run a RV air conditioner, you need about 12 -16 amps of power at 120 v. In 12 v, this is equal to about 120 - 160 amps. That is more than most RV alternators can put out at full capacity. You would need almost 3000 watts of inverter to supply that much 120 v power, not including start up amperage that could be as much as 700 - 1000 watts more.
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Old 10-07-2013, 06:57 PM   #17
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I run inverter on for the crockpot and the fridge on propane. The fridge is set on auto and runs on propane when not on shore power even if the inverter is on. I figure the designers of the fridge and the motorhome know best. Works for us.
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Old 10-07-2013, 07:16 PM   #18
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We always use the inverter to power the fridge when driving. Just be careful and don't leave the RV on inverter power when parked for several hours! Don't ask me how I know that!
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Old 10-07-2013, 08:34 PM   #19
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I thought about getting an inverter for ac power while on the road, but my diesel 7kw gen uses a gal. very 120-150 miles running the ACs too.(according to the owners manual)
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Old 10-07-2013, 09:48 PM   #20
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To run a RV air conditioner, you need about 12 -16 amps of power at 120 v. In 12 v, this is equal to about 120 - 160 amps. That is more than most RV alternators can put out at full capacity. You would need almost 3000 watts of inverter to supply that much 120 v power, not including start up amperage that could be as much as 700 - 1000 watts more.
The new Newmar King Aire runs the middle AC off the inverter while traveling. There is an enormous amount of batteries and a large inverter. I don't know how economic it is compared to running the genny though.
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Old 10-08-2013, 08:46 AM   #21
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Here are several discussions on having propane on while driving:
Is it Safe to Travel with My RV Refrigerator on Propane?
The RV Doctor: Propane On While Driving an RV - Oh Boy!
Traveling with Propane RV Fire Safety RV Travel
There are of course lots of posts in various forums on the topic too.
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Old 10-08-2013, 09:43 AM   #22
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I was wondering about using the alternator/inverter to run refrigerator and minor AC items while driving vs. running the generator. I have an LP generator and it seems like a waste of lp to run the generator if the ac is not required. Any negatives, the batteries probably not getting a full charge?

Thanks
We have been full-timing for 7 1/2 years, and the inverter has never been shut off in all that time (except for about 30 minutes to replace the house batteries). We used to leave it just so our satellite DVR would not reset and loose its memory and channel guide when we unplugged from shore power.

Two years ago, we installed a residential refrigerator, which also runs off the inverter while we're on the road with no problem. Some people have even installed a line from their inverter to run their RV refer on AC while on the road to save propane. That works, too - providing your inverter is big enough. An RV refer will draw more current on AC than a residential refer.
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