Paul, Thanks for these more accurate "ratings". It definitely helps to give an answer to the question of "what does good look like?" I have never saught out actual ratings for refrigerator loads and I've never gotten a AHr meter installed - besides the plethora of variables which make single point AHr usage almost impossible to determine. It seemed like nobody else had provided a frame of reference besides examples of their own setup and I was kinda trying to describe a worst case numbers scenario to provide an upper boundary to the project. Your numbers bring further clarity by providing a lower boundary.
You and other listers are absolutely correct that adding insulation is the best way to reduce refrigerator AHr load. Thanks, Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mon, Oct 16, 2017, 9:20 AM Dreuge via CnC-List <cnc-list@cnc-list.com> wrote: > > 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. > > _______________________________________________ > > The bills have started coming in for the year 2018 and have gone up > again. October will be our fund raising month. Please consider sending a > small contribution to help keep this list running. Use PayPal to send > contribution -- https://www.paypal.me/stumurray > > All contributions are greatly appreciated! >
_______________________________________________ The bills have started coming in for the year 2018 and have gone up again. October will be our fund raising month. Please consider sending a small contribution to help keep this list running. Use PayPal to send contribution -- https://www.paypal.me/stumurray All contributions are greatly appreciated!
