Fridge space in Trillium 1300 - Fiberglass RV


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Old 03-31-2015, 09:21 PM   #1
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Fridge space in Trillium 1300

So we finished up our solar install on our Trillium (link 1975 Trillium 1300 solar project ) and learned that our Dometic RM24 doesn't work off 12v that we can see so far. Worst case scenario, we need a new fridge. The Engel SB70 at 20"x23"x21" (LWH) and the SB47 16.5"x20"x21" are appealing, but I'm not sure if the space is there for the larger SB70. Original Dometic dimensions are 19 7/8"x19 3/8"x22 3/8. Anyone know how much extra space is in the fridge cavity? Also, anyone know why the Dometic would run off 110 but not 12v? We checked connections and fuses. Everything looks good.
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Old 04-01-2015, 10:35 AM   #2
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Check the 12 volt heating element. Have you tried running on propane? The 12 volt power requirements of this type of fridge (adsorption cycle) will quickly drain even the largest deep cycle battery unless your solar panel is able to charge the battery faster than your fridge ( and other 12 volt uses) drain it.
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Old 04-01-2015, 11:07 AM   #3
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A propane fridge uses way too much power when operating on 12 VDC. I don't think most solar installations could keep up. You are way better off using a 12 VDC compressor type fridge.

While there is additional room in the kitchen for a larger width, and height, there is no more depth.
The dimensions I have for an RM24 are: 22-3/8" x 19-3/8", 19-7/8" (h x w x d)
I would have thought that a 1975 Trillium 1300 would have had an RM211: 22-11/16" x 19-5/8" x 17-5/8"
These dimensions come from this chart:
http://www.thetford.com/Portals/0/PD...er_rev4-13.pdf
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Old 04-01-2015, 11:41 AM   #4
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You have enough solar to run a small compressor fridge. They typically run 3 amps with a 50% duty cycle compared to 7-10 amps at 100% duty cycle of an absorption fridge. That said, if your current fridge runs on 110 volts then the cooling system is operational. It would be worth your while to try the propane operation. My propane fridge will run for over a month on a single 20lb. tank. A service manual may be in the forum document center but if not try Dometic. You may need to clean the burner. Raz
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Old 04-01-2015, 11:59 AM   #5
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We tried to run it off propane last summer and that doesn't appear to be working either. The idea was to run the fridge off the batteries while we're camping so a compressor fridge would definitely be better as mentioned above. Also, the controller can be programmed to shut down during off hours so there's always that option to save some battery life. We have some decisions to make!


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Old 04-01-2015, 04:38 PM   #6
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Before I gave up, I'd clean the burner. If you don't feel comfortable doing it yourself, a qualified tech can do it in an hour. A compressor fridge will cost $500-$700 or more if you can find one that fits. I seem to recall some folks buying one at Costco?? I'm sure someone will jump in. Good luck, Raz
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Old 04-07-2015, 08:54 PM   #7
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Well, after the troubleshooting on the RM24, we've decided to go with a new compressor fridge. A previous owner did some modifying and getting the current fridge back to 12v would cost money. It also needs a new seal. Cheaper than a new fridge but in the long run, a new fridge that draws less power is the way to go for us. We're going to remove the fridge after this weekend to get exact measurements of available space then order the new one. Sounds like Engel or Nova Kool for around $650-700 is the way to go. Any feedback on one brand over the other?


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