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 > What size generator to run AC??

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bgum

South Louisiana

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Posted: 06/27/22 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

There you folks go using facts again to support your position.

Huntindog

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Posted: 06/27/22 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

As noted, all of the propane downsides are true.
There is one and only one advantage to propane. No carb to gum up.

Now this is an important advantage to those that do not use their generators much... And that covers a lot of people.
As I have said here before, "Propane is well suited for light users. Gas is s better choice for heavy users.
I was a heavy user for many years. My two EU 2000s never had any carb issues. Boondocking as I do in remote locations, propane was an unworkable fuel for us.
Now with 1860 watts of solar, my usage is less most of the time. But I am keeping the Hondas around for those cold weather winter hunts that require a LOT of generator use.


* This post was last edited 06/27/22 07:57pm by Huntindog *   View edit history


Huntindog
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valhalla360

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Posted: 06/28/22 08:20am Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

Regardless, propane is overall less desirable "alternative" to gasoline when it comes to loss of wattage (the terminology you are looking for is "DE RATED").

Propane contains LESS energy per GALLON than gallon of gasoline.

.............


to build a trailer to haul a 250 gallon propane tank with you you are stuck with retail by the pound pricing.

Propane gens also have additional demand regulator, which can foul up, propane doesn't vaporize fast in cold temps which can cause fuel starvation and can even stop vaporizing in cold temps..

Propane isn't always propane, some areas you may get butane at a higher mix in your propane and butane is less BTUs and burns at a slower rate which affects just how well your engine performs and final wattage output.

Something else to consider, "dual fuel" setups are a "COMPROMISE" and overall most small engines are built and tuned for gasoline, the timing and compression are typically optimized for gasoline and not propane..

It sounds good on paper, but in real world use, a compromise is a compromise..

If you don't mind moving 20 lb to 30 lb cylinders (which weigh 38 lbs and 58 lbs each respectively) all the time while camping then have at it, but myself that sounds like a real hassle..

Some of you guys are really way over dedicated to making camping a lot more about doing chores than relaxing.


If you are trying to operate on a single 2000-2200w generator, the derating is an issue as you are marginal running the air/con at the full gasoline rating. When talking about a 4500w generator or a pair of 2000w generator's ganged together, the derating is irrelevant as it's still more than enough power.

Yes, propane is less energy dense but propane is also cheaper per gallon. Largely it's a wash (or close enough that I don't care):
- 4.6gal propane (#20lb tank) is equivalent to 3.4gal of gasoline in terms of total stored energy. I paid $20 to fill a 20# tank last week. At current prices, that would be $17 in gasoline. I don't run the generator 24/7 for weeks on end, so it's close enough as to not matter.
- If you are comparing to a 250 gal propane tank, you would need 185 gal gasoline tank...neither is a great option when mobile though if you are talking about a seasonal site, lots of propane places will drop a big tank for free if they can bring the truck by and fill it up for you (In fact, we have friends who did just that).

Extreme cold is an issue at peak loads but I don't usually run the air/con in those conditions.

Any place with lots of butane in the mix is not going to have extreme cold. Of course, in N. America, it's largely urban legend with most places having less than 5% even in warm areas.

Yes, propane cylinders weigh a little more but it's lift out of the truck and set next to the generator...done. With the 5 gal jug, I then need to hold it up while pouring, using the asinine eco-spouts that require 6 hands to operate and still drizzle fuel over the top of the generator for 2-3 minutes...so as you say...on paper it sounds good being lighter.

But really the driving issue is reliability. Propane is far less likely to gunk up. Even if after 10yrs, the regulator fails, that's a 5min replacement to swap out with a new one. I fought with the old Yamaha gas generator for a couple years surging. Even had a couple small engine guys try with limited success. $300 for a new carb that will gunk up again or sell it for $300 and get a bigger dual fuel unit for $800.

Yes, there are use cases where gasoline makes sense but for your average RVer who uses it a few days per year, propane is really the way to go.

PS: With dual fuel, I can always revert to gasoline if I do run across a use case where gasoline is preferable.


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Bobbo

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Posted: 06/28/22 08:11pm Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

With the 5 gal jug, I then need to hold it up while pouring, using the asinine eco-spouts that require 6 hands to operate and still drizzle fuel over the top of the generator for 2-3 minutes


[image]


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valhalla360

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Posted: 06/29/22 07:10am Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

valhalla360 wrote:

With the 5 gal jug, I then need to hold it up while pouring, using the asinine eco-spouts that require 6 hands to operate and still drizzle fuel over the top of the generator for 2-3 minutes


[image]


I actually have a syphon hose but regardless, you still have to hold the jug while the fuel is transferring...so it's a bit lighter but you still have to lift it for much longer.

Microlite Mike

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Posted: 06/29/22 05:17pm Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

Additionally, you get nailed on the price of propane in small portable cylinders since in small cylinders they sell it by the pounds.


I haven't purchased Propane in my travels (West of Rockies mostly) where my "portable" tanks were filled by weight. The person filling just connected hose to tank, pumped in propane, then gave me a ticket with meter reading written on it for cashier. Truck Stops, Propane Distributors, Campgrounds, Gas Stations, and even places like Tractor Supply and Convenience Stores, all BY THE GALLON.

In my State any scale used for "Commerce" has to be tested and certified by our State Dept of Agriculture weights and measures division. The meters are easier for them to test, certify, and seal, than a scale which could be "altered" once the inspector's vehicle is out of sight.

I also haven't had to remove my tanks from the tongue of my Trailer for decades. I stop my Trailer where it can be reached by the hose and they're filled in place.

As for my 3500W Inverter Dual Fuel, I run propane when I need the A/C overnight. I get 6-7 hours on a tank of gasoline with A/C running and I can get twice that from a 20# tank of propane (which I carry two of in my truck).

For me it's a matter of not having to interrupt my sleep to tend to the generator's fuel when it's hot and muggy all night.


"Knowledge is realizing that the street is one-way, wisdom is looking both directions anyway."


~ Albert Einstein

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