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Old 09-22-2013, 06:11 PM   #1
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Has anyone successfully extended runtime for LP genny?

Has anyone ever successfully extended the run-time of a liquid draw LP generator? I have a Onan 6500 LP (Liquid draw) on my 98 Discovery DP. It has about a 26 gal (usable) LP tank that gives me around hours of use.

I'm looking to extend that by another 12-24 hours. I'd like to hear from folks that have either changed their tank, added a second tank or have some other ingenious solution.
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Old 09-22-2013, 06:15 PM   #2
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Has anyone ever successfully extended the run-time of a liquid draw LP generator? I have a Onan 6500 LP (Liquid draw) on my 98 Discovery DP. It has about a 26 gal (usable) LP tank that gives me around _______ hours of use.

I'm looking to extend that by another 12-24 hours. I'd like to hear from folks that have either changed their tank, added a second tank or have some other ingenious solution.

You forgot to fill in the blank
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Old 09-22-2013, 06:22 PM   #3
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We did with an "Extend A Stay kit. Took a 10 gal tank with us, had it filled twice and used most of the onboard 40 (32 usable) gallon tank. Used all this in 5 days. The gen also overheated and quit twice.
Will never have a propane gen in an RV again!
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Old 09-22-2013, 09:46 PM   #4
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LP Gen Set

You can tie BOTH LP tanks together with a hose. My Propane dealer fixed mine and it works great..

Good Luck, Chuck
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Old 09-23-2013, 07:57 AM   #5
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You can tie BOTH LP tanks together with a hose. My Propane dealer fixed mine and it works great..

Good Luck, Chuck
Can you give me their contact info? I'd like to find out exactly how this was done. Also, please confirm that your gen set is LIQUID withdrawal. Thanks.
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Old 09-23-2013, 07:58 AM   #6
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You forgot to fill in the blank
Ha! Sorry about that. I get about 36 hours.
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Old 09-23-2013, 09:25 AM   #7
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Here's an automatic liquid propane change over valve. Not the only one available either: Amazon.com - Liquid Propane Change Over Valve
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Old 09-23-2013, 01:32 PM   #8
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Your 40 gal tank should have 32 gal usable.
My 6.5W has averaged about .75 gal per hour.
So the tank should last for 40-42 hours of running.

The Discovery Owners web site has in the Hints & Tips how to tie the 2 tanks together. It does cost to join.

But it won't help the generator LP supply any. :(
The main advantage of connecting the two LP tanks is that your COACH has access to the 24 gal coach LP tank and the 40 gal generator LP tank (both are water capacities).

Note that this will not extend the available LP for your generator, mainly because the generator uses liquid LP and the coach uses vapor, and it is a very slow process for the propane to transfer to the generator LP tank. However, this modification is very beneficial as you can use your 40 gal generator LP tank to provide LP to your coach appliances.
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Old 09-23-2013, 02:43 PM   #9
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Ha! Sorry about that. I get about 36 hours.
To get about 18 more run hours you would need to add approx, 13 more useable gals. of storage......that would be a 16 gal. w.c. tank. ONe relatively easy way to get more liquid withdrawal storage is to use forklift tanks. Two 8 gal (w.c.) cylinders would give you enough. You can get the band clamps to mount the cylinders......probably need to be mounted horizontally. You can simply tie all the tanks together using hose rated for propane liquid. The hose is the same hose used for propane powered vehicles and forklifts. Finding the space may be a challenge.
Hope all this helps you
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Old 09-24-2013, 09:39 PM   #10
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Gen Set

John, We have the same coaches..same Gen. sets..A while back I posted a couple of pictures of the hook-up.Send me an e-mail and I'll try to find the pic.

Chuck
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