Mike, Though not an answer to your question. The Blue Water Sailing review on the Coolmatic cooler says that it cycled only 12 to 15 minutes per hours when operating in the sun. That means it only need 45W/4. Just over 11W because the insulation is so good. Note that Coolmatic also have a thermo blanket option. The key is good insulation, in addition to very good/efficient compressor technology.
- Vince http://gipsyflies.home.comcast.net 1989 Vanagon GL Camper 1993 Mazda Miata (for sale) 1996 Land Rover Discovery 2005 Mini Cooper S
-----Original Message----- From: Rocket J Squirrel [mailto:j.michael.elliott@adelphia.net] Sent: Monday, September 06, 2004 3:04 PM To: Vince S Cc: vanagon@GERRY.VANAGON.COM Subject: Re: 12v Aftermarket Coolers ? Any Good?
Vince S wrote: >Sorry I meant Danfoss from Denmark. Coolmatic is one cooler with these >compressor. There may be other cooler with other compressors that may >be cheaper. > >http://www.waeco.com/pages/products/mk/cmkbov_truck_d.htm > > > Hmmm . . . I'm wanting to learn how to translate deep cycle battery ampere-hour ratings into real world performance, and these reefers seem like a good exercise. Assume we are using a fully-charged deep-cycle battery, like an Optima, rated at 52Ah (C/2) / 65Ah (C/20) to run the reefer. Also assume its a hot day, 32C. Finally, assume that there is some nicely chilled lager in the reefer that we would hate to see get warm. Here are the data for two of the Danfoss reefers: Danfoss CDF-35 "incredibly inexpensive" 31 liter model. It is rated at 45 watts, and has an average running time: of 30% at 32C ambient temperature. Its rated power consumption is defined as power input x average running time. For this model, then, we are talking 30% of 45W, or 13.5W ~ 1Ah. Danfoss CF-25 (not-so-incredibly-inexpensive) -- their smallest model. 25 liters, average power consumption: 35 watts, average running time: 19% at 32C ambient temperature. This translates to 6.7W, ~560mA. For these two models, then, how long before the compressor stops chugging? -- Mike "Rocket J Squirrel" Elliott 71 VW Type 2 / 84 Westy: A poor but proud race. KG6RCR |
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