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Old 09-25-2008, 04:39 PM   #29
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Run on LP. Gen is only on if we need the A/C than fridge wil switch over by itself.
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Old 09-25-2008, 06:43 PM   #30
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jimandsue60:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Meandering Retiree:
We always run the generator when we travel. It uses less than a gallon an hour and we run the refrigerator on automatic so it runs on electric while we travel. With the generator on we can run the heat pumps or the air conditioners while traveling. </div></BLOCKQUOTE>

Don't you have dash air or dash heat?

Jim </div></BLOCKQUOTE>

Yes, we do. But a dash air conditioner pulls approximately 10% of the horse power of the engine to run. The generator is fewer horsepower and cheaper to run. The heat pumps keep the entire coach cool in that we set the back heat pump to a lower temperature than the front one and have less noise up front. When we first purchased our coach, I read all of the rv forums I could find and most seemed to agree that running the generator for the electrical needs while on the road was cheaper than running the refrigerator on LP and the dash air conditioner. Just a point of view.
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Old 09-26-2008, 04:13 AM   #31
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
Yes, we do. But a dash air conditioner pulls approximately 10% of the horse power of the engine to run. The generator is fewer horsepower and cheaper to run. The heat pumps keep the entire coach cool in that we set the back heat pump to a lower temperature than the front one and have less noise up front. When we first purchased our coach, I read all of the rv forums I could find and most seemed to agree that running the generator for the electrical needs while on the road was cheaper than running the refrigerator on LP and the dash air conditioner. Just a point of view. </div></BLOCKQUOTE>

That is an interesting point of view. I wonder how one would calculate 10% of horse power to fuel used?

Jim

PS: We pull a Mini S also.
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Old 09-26-2008, 08:47 AM   #32
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jimandsue60:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
Yes, we do. But a dash air conditioner pulls approximately 10% of the horse power of the engine to run. The generator is fewer horsepower and cheaper to run. The heat pumps keep the entire coach cool in that we set the back heat pump to a lower temperature than the front one and have less noise up front. When we first purchased our coach, I read all of the rv forums I could find and most seemed to agree that running the generator for the electrical needs while on the road was cheaper than running the refrigerator on LP and the dash air conditioner. Just a point of view. </div></BLOCKQUOTE>

That is an interesting point of view. I wonder how one would calculate 10% of horse power to fuel used?

Jim

PS: We pull a Mini S also. </div></BLOCKQUOTE>

I use the 10% figure because that is what we were told by the dealer on our cab tractors. He said that you could not use a gas engine on a cab tractor because it would pull too much horsepower for the AC. So all of the cab tractors on the farm were diesel. That was 20 ago or better so things may have changed drastically since then. We love to pull the Mini S because of the fun when we arrive.
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Old 09-26-2008, 10:03 AM   #33
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Dash air efficiencies are a bit of a tangent to the original thread, so apologies to the original poster.

An absolute 10% figure is a little difficult to rationalize due to variances in engine sizes and AC system tonnage. A 1.4 Liter engine in a small sedan will have quite a load on it with a typical AC compressor. My 8.9 Liter Cummins ISL probably doesn't even notice the load of the compressor.

We run dash air almost 100% of the time and augment it with basement air usually about noon if we are in 90+ temperatures. Our primary concern is keeping the coach comfortable.
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Old 09-27-2008, 03:15 PM   #34
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Either running off the inverter or completely off. Never on propane. End of statement.

With 400 watts of solar on the roof, we can stop for fuel or shop for a bit and batteries are ok, weather dependent.

If you run with fridge off, you may want to put one or two freezer packs, like Blue Ice, in the freezer the night before. Whe you are ready to travel, move the freezer packs to the fresh food section.
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Old 09-28-2008, 11:26 AM   #35
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Always on propane.

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Old 09-28-2008, 03:38 PM   #36
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This has been very interesting reading. I myself will run on propane when driving. The fridge will auto switch to AC when available. Since April of 2004 the fridge in the motorhome has only been off for short periods of time while refueling. Even when parked at home I have it on and cold. I do have 50 amp service at the house so I do keep it plugged in and charging the batteries as needed. I also keep an automatic style charge on the engine batteries which keeps them topped off. I did find out from a tech at Dometic that keeping the fridge running all the time will keep rust from building up in the firing chamber.
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