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Old 10-01-2012, 11:08 AM   #29
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The following link has info on the Frio Insulin Wallet and related products. Several testimonials appear to indicate that this works well for backpackers and campers:

FRIO Diabetic Insulin Cooling Cases Buy From Our Authorized US Distributor

Note: I have no affiliation with Frio or Cooler Concept. I found this site in an Internet search for ways to store insulin while traveling. There may be other products that use evaporative cooling to maintain proper storage temperatures for insulin that work better and/or are cheaper.
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Old 07-07-2014, 10:19 PM   #30
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So as I am reading through these comments, I assume that the refer will not work on electricity while traveling and if I want to keep my stuff cold, I need to use propane mode?
Than you in advance.

Ron
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Old 07-29-2014, 10:04 PM   #31
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Running fridge from inverter via solar

I'm chiming in with my recent experience.

I have a 2013 25FB Flying Cloud. The fridge is a Dometic RM3762. The 120 volt heating element in the fridge is listed as being a 325-watt version.

I just upgraded my trailer with 435 watts of solar panels on the roof, an inverter, and a pair of group 27 batteries, for a total of 200 amp-hours of battery capacity.

When I turn on the inverter and the fridge turns on its electric heater, the inverter draws 31 amps (That's 372 watts at 12 volts). The solar panels put out about 25-26 watts at mid day under a clear sky, in northern areas such as Washington state. So the solar can't run the fridge by itself. But when I start my car, the car provides enough power that it makes up the difference. I have even seen the system put a couple of amps of charge into the trailer batteries when the fridge is on, the sun is out, and the car is running.

When traveling, I find that I can run with the fridge on and end the day with my batteries fully charged, as long as the day ends around 4:00 or so (and the sun is out). When I extend the traveling day to 5:00 or 6:00, I find the batteries are down maybe 10 or 20 amp-hours by the end.

I don't think this would work very well in the winter.

I believe the fridge cycles on and off, which gives a chance for the batteries to recover some charge, but I don't know what the duty cycle is.

I think it is safe enough to run the fridge on propane when traveling, but I do think running on electric is viable under good conditions, IF you have a big enough solar system.
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Old 07-29-2014, 11:32 PM   #32
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Quote:
Originally Posted by SSquared View Post
I'm chiming in with my recent experience.

I have a 2013 25FB Flying Cloud. The fridge is a Dometic RM3762. The 120 volt heating element in the fridge is listed as being a 325-watt version.

I just upgraded my trailer with 435 watts of solar panels on the roof, an inverter, and a pair of group 27 batteries, for a total of 200 amp-hours of battery capacity.

When I turn on the inverter and the fridge turns on its electric heater, the inverter draws 31 amps (That's 372 watts at 12 volts). The solar panels put out about 25-26 watts at mid day under a clear sky, in northern areas such as Washington state. So the solar can't run the fridge by itself. But when I start my car, the car provides enough power that it makes up the difference. I have even seen the system put a couple of amps of charge into the trailer batteries when the fridge is on, the sun is out, and the car is running.

When traveling, I find that I can run with the fridge on and end the day with my batteries fully charged, as long as the day ends around 4:00 or so (and the sun is out). When I extend the traveling day to 5:00 or 6:00, I find the batteries are down maybe 10 or 20 amp-hours by the end.

I don't think this would work very well in the winter.

I believe the fridge cycles on and off, which gives a chance for the batteries to recover some charge, but I don't know what the duty cycle is.

I think it is safe enough to run the fridge on propane when traveling, but I do think running on electric is viable under good conditions, IF you have a big enough solar system.
I think it may work fine in winter. Your solar may not be contributing much, but remember that it is winter and your fridge won't need to run much to stay cold.

Dan
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Old 07-30-2014, 01:37 AM   #33
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Good point, Dan.
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Old 07-30-2014, 11:16 PM   #34
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Hi Ssquared, I didn't think of solar panels. Great idea. Do they conform to the top okay? How did you attach them? Thank you, doug.
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Old 07-30-2014, 11:38 PM   #35
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Fwiw,,,, I have a 10cuft residential fridge, my tow vehicle easily runs the fridge and fully charges my batteries simultaneously.

Maybe solar might keep up with a residential style fridge.
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Old 07-31-2014, 06:03 AM   #36
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I have always had propane flame out/relight problems at hwy speeds in crosswinds. The flame goes out and the auto relight tries about 5 times and then reads error message. The freezer must be packed with ice to insure max. temps. towing with propane in play. I read that propane is approx. 30% less efficient than 110v AC, so it seems the only way to tow would be with an AC inverter connected to the refrigerator. Is this not the easiest way to improve cooling in high temps. during summer months? Why aren't we all doing this?
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Old 07-31-2014, 09:30 AM   #37
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Why aren't we all doing this?
For the reasons that were listed in the thread already - it requires fairly substantial battery capacity and solar (or a better charging system from the vehicle) to recharge them while on the road.

Setting aside the residential fridge idea (because we occasionally boondock), the 31 amps quoted means your battery/batteries won't last long.
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Old 08-09-2014, 07:19 PM   #38
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Old 08-09-2014, 07:37 PM   #39
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My Solar panels

Quote:
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Hi Ssquared, I didn't think of solar panels. Great idea. Do they conform to the top okay? How did you attach them? Thank you, doug.
Hi Doug,

Sorry, I only just now saw your question.

My solar panels are the AM Solar 100 and 135 watt models. They are rigid panels. They are mounted on stand-up mounts at each corner, giving an inch or two of space between the roof and the frame of the panel. They are attached with special 3M "Very High Bond" tape, plus Sikaflex sealant.

I did not personally install them; Lewster & his son did.

You can get flexible panels that you glue flat to the roof. That's not what I have. I think my panels are mounted low enough that they don't provide too much more wind drag, and don't look too bad. There are three on the front and one at the back. The wires run down the back of the fridge.
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Old 01-24-2015, 06:28 PM   #40
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Follow up after fall travel

Here is a belated update.

We made our last trip of 2014 during the last week of September, in Colorado. We still did OK terms of the battery state of charge at the end of a travel day when running the fridge from the inverter, though I think it worked better in the summer.

The days had highs near 80, usually with sun in the morning, clouds and some rain in the afternoon. It was warm enough that the fridge needed to run regularly, though obviously less than in summer heat (I don't have a way to track the fridge on/off times). The lower sun angle reduced the power we got when we did have sun--the highest output we saw on this trip was 21 amps.

So on one travel day, we were at -14 amp hours when we stopped at 6PM. On another day, we were at -21 when stopping at 4PM.
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