Propane refrigeration?

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GYXU > Boats > Propane refrigeration? 4 May 2005 06:24:36

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Propane refrigeration?
Evan Gatehouse 3 May 2005 10:14:25
	I am considering a propane refrigerator on my 40' catamaran. These propane fridges don't work well with monohulls unless gimballed but cats do quite well with them. Gemini cats use them as standard equipment (and they seem to require little maintenance). My priorities are lightest weight and reliability. I kept hearing "we've had a propane fridge for 10+ years with no problems" on the Gemini owners list. If I went this route, it would be installed on the bridgedeck cabin, venting into the cockpit and installed in a gas tight box, separate from the rest of the boat. I thought I would just take a stab at rough costs and weight of two options. The results surprised me: PROPANE Weights: (lb) 1 extra 20 lb tank (aluminum) 13 full of propane 20 Norcold 5 ft^3 fridge 99 extra insulation 10 hose, fittings 4 Total weight 146 lbs Costs: 20 lb tank 125 Norcold fridge 1000 extra insulation 50 hose/fittings 50 Total $1405 (I would already have regulator, alarm, solenoid because I will have a propane stove) ELECTRIC FRIDGE Weights: (lb) Home made box 50 lb Ice box conversion kit 20 lb extra solar panels 2x75 watt 35 lb extra battery capacity ~120 lb (say 2x60 lb golf cart batteries) Total weight 225 lbs Costs: Home made box 100 Ice box conversion kit 850 (through careful shopping) solar panels 650 extra battery 120 Total costs: $1720 I started this exercise convinced that a propane fridge would be too heavy but now I'm leaning the other way! The only variable I have left out of the cost side of things is the cost of propane. But say the 20# tank lasts 1 month; that's $150-200/year in extra propane. Probably the increased reliability and lack of maintenance vs. an electric fridge would offset this to some degree. Now all I have to do is put some heating coils in the back of the fridge to heat hot water and I'm set. No need for a propane on demand hot water heater because the fridge is doing the work for you. (o.k. I'm kidding about this) Somebody tell me where I'm missing something on the cost/weight comparison please! Evan Gatehouse
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Old Nick 4 May 2005 04:47:08 [ permanent link ]
	On Mon, 02 May 2005 23:14:25 -0700, Evan Gatehouse <ceilydhNO_SPAM@3web.NOSPAM.net> wrote: No expert info here, although I have lived in vans that used gas fridges and they work fine. They would not get the rocking that sea would cause, but get a fair battering from road travel. You need to look at the cost of fuel, or an extra bit on the wind turbine/solar panel to generate electricity to run an electric fridge as well. I don't know if you're looking at a eutectic style, but even they draw pretty fair current to work well. rant on........... Mind you, that may be hard to find out. Don't ya love the following specs and the terms? Current in amp-hours and energy in amps. (astrerisks are mine) http://old.cruisingworld.com/joecold/coltest5.htm "12-VOLT COOLING SYSTEM: Time to cool refrigerator from 65В°: 38 min. Current used: 25.5 amp-hrs. Time to cool freezer from 65В°: 1:34 min. Current used: 52.5 amp-hrs. Refrigerator perfomance: Time to freeze refrigerator plate: 30 min. Current used to freeze refr. plate: 16.9 amp-hrs. Daily (24-hr.) current required: 12.2 amp-hrs. Freezer performance: Time to freeze freezer plate: 35 min. Current used to freeze freezer plate: 19.3 amp-hrs. Daily (24-hr.) current required: 44.9 amp-hrs." and then the real killer..... "DAILY ENERGY REQ: 57.1 amps." If they mean the daily energy required is 57 amp-hours, that's quite a drain on a battery. You need about 2 amps 24 hours per day to keep up. And then there is this, just in case you need to know how well solar works http://www.quirks.com.au/autofrdg.htm "*SOLAR-PORT Large: 2 x 50 watt solar modules in suitcase configuration. Output from these modules would be approximately 5.8 amps per hour of peak sunlight (for a location such as Sydney, the average daily output during summer months would be ~35 amps per day to a 12 Volt storage battery). " rrgghhrrgh! rant over I am considering a propane refrigerator on my 40' catamaran. > These propane fridges don't work well with monohulls >unless gimballed but cats do quite well with them. Gemini >cats use them as standard equipment (and they seem to >require little maintenance). My priorities are lightest >weight and reliability. I kept hearing "we've had a propane >fridge for 10+ years with no problems" on the Gemini owners >list.
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GYXU > Boats > Propane refrigeration? 4 May 2005 06:24:36

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Propane refrigeration?

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