If you have a refrigeration load of 120AH/day, don’t waist money on increasing battery and charging capacity.
Spend a little cash on better insulation or rebuild your box with more and better insulation. It is not unreasonable to shoot for a refrigeration load under 30AH/day. Just have a look at Wally’s Stella Blue page titled “Marine refrigeration and freezer on 22AH/day”(I recall he has a Frigoboat unit with keel cooler). Technautics claim that their CoolBlue system consumes “24AH/Day for a 7 cubic foot fridge/freezer with R-30” and “operates at ambient temperatures up to 120F without a loss in system efficiency.” Even the Isotherm claims their ASU SP3751 can achieve loads under 20AH/day. Now making ice or cooling down warm beer on a really hot day will likely have higher load demands, but the message is still the same. Insulation is cheaper than batteries and lasts a lot longer too. - Paul E. 1981 C&C 38 Landfall S/V Johanna Rose Fort Walton Beach, FL http://svjohannarose.blogspot.com/ > On Oct 14, 2017, at 2:02 PM, cnc-list-requ...@cnc-list.com wrote: > > Lets consider some hypothetical numbers based on the rep's info. If a 100w > panel were %100 effective and operated for 8 hours, you would get 800w-hrs > of power per day. 800w divided by 12v = 67amp-hrs. 67 divided by 24hrs = > 2.8amps current draw on average. > > That kinda gives you a ball park for what type of loads you'll be facing. > Round up to 5amps/hr if you like for margin. 5 *24=120AHr per day.
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