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Old 07-30-2015, 03:51 PM   #11
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Running a generator takes energy to create the power to run air conditioners. Here is a Wiki comparison showing BTU equivalents to one gallon of gasoline. https://en.wikipedia.org/wiki/Gasoli...lon_equivalent

Gasoline has 114,000 BTU per gallon
LPG has 84,300 BTU per gallon
Diesel has 129,500 BTU per gallon

My conclusion is that it takes significantly more propane by volume to equal the same energy as a gallon of gasoline. Diesel is even better.
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Old 07-30-2015, 06:45 PM   #12
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Propane doesn't have the BTU per gal. of gas or diesel, thus you need MORE of it. I had 1 MH with propane, should read PITA. Drained the propane saddle tanks in 30 hours on a hot weekend. Gas and diesel draw from onboard tanks and last longer!
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Old 07-30-2015, 08:07 PM   #13
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On my new 2016 Forester MBS 2401 R we have the smaller LP tank. I wanted the 15k ac and heat pump unit. For that, the LP generator is required since the diesel cannot power the 15k unit. I've heard that an LP retrofit for a larger propane tank might be an option. Does anyone know if that's true?
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Old 07-30-2015, 08:21 PM   #14
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The new FR Coachmen Prism MBS has a 20 gallon LP tank. That part # may be great place to start as a retro.
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Old 07-30-2015, 09:28 PM   #15
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Quote:
Originally Posted by MOODMAN View Post
On a related note, I have a question about what generator to buy.

My 5er has two air conditioners and plugs into a 50A circuit.

I may buy a generator in the future, but want one with enough capacity to run my onboard systems, especially the AC.

So how many watts is "enough" for my needs? I don't want to buy one that is too large, but also one that is not too small. Too large will use too much fuel, and not enough will just frustrate me.

Advice???
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Originally Posted by Jim Schings View Post
Assuming 2 13K BTU units, 8 KW will make it easy. You could get buy with 6 KW if you are careful. (ie. no microwaves, hair dryers, or coffee makers with A/C running. )
50 amps = 6,000 watts (6kw). Formula is amps * volts = watts.

As Jim said, 8,000 watts (8kw) will make sure you have no issues. Generators have a max output and a continuous output, an 8kw peak with at least 6kw continuous will work for you.
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Old 07-31-2015, 11:50 AM   #16
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The new FR Coachmen Prism MBS has a 20 gallon LP tank. That part # may be great place to start as a retro.
I am sure you know this (I did not clearly understand it until recently realizing my tow vehicle was going to be a propane tanker truck)....but 20 gallons of LP is better than two times what our 2016 FRF MBS will have (9.8 gallons). I am not sure that would have changed our purchase decision....but it would have at least made it on our pro/con decision list.
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Old 07-31-2015, 12:13 PM   #17
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It would have made it on my pro/con list as well. I think its crazy that there is an LP tank which at best can run my AC for 13 hours or so. Thats nothing. It should be able to run for days and days if necessary as have my other Motorhomes. My Monaco had a 5K genset and it could run on gasoline for five days full time in 90 degree daytime heat and 75 at night.
Some reading this may think that I am an AC nut or allergic to heat. Actually I love hot weather and love boondocking without any AC. Its just that a $100K motorhome should have the capability to use the AC for much longer than it does. Very disappointing but never asked the salesman about this. Just assumed it was like the rest of my RVing experience.
My solution is to carry another full LP tank which is heavy and takes valuable space in a 24 foot motorhome, but thats what I will do. I already ordered the attachment that goes from the OEM LP tank fitting to the outboard tank. Some use the Extend a Stay for this.
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Old 07-31-2015, 12:37 PM   #18
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Quote:
Originally Posted by Beach Bums View Post
I am sure you know this (I did not clearly understand it until recently realizing my tow vehicle was going to be a propane tanker truck)....but 20 gallons of LP is better than two times what our 2016 FRF MBS will have (9.8 gallons). I am not sure that would have changed our purchase decision....but it would have at least made it on our pro/con decision list.
It would have made me think more about it, as well.

The Prism does loose towing capacity due to that and other things, though. It is @ 3500 lbs vs. the Solera @ 4200 lbs.
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Old 07-31-2015, 12:48 PM   #19
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I was lucky in that I'd read about the propane generator issue here and my dealer was aware of it as well. Based on that info we ordered our 2400W with the optional QD3200 diesel generator. That is an expensive option to fix the problem though...

If I recall correctly FR is trying to figure out what to remove to make room weight wise for the larger LP tank. The glass door in the shower was one item I think was mentioned as a possible weight reducing move. Even though we have the QD I'd still want the larger LP tank for other uses if it is offered for retrofit.
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Old 08-02-2015, 08:59 PM   #20
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I wanted the 15k btu heat a/c with heat pump option, which I was told the diesel genset would not support. Having installed Sumo Springs, I'm thinking of putting on the larger propane tank, and maybe removing the stabilizers. Maybe.
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