Let me expound a bit on alternators and engine size. When replaced my dumb alternator with a Balmar set-up (alternator, smart Charger, digital Duo etc ) on my 33 hp diesel Balmar recommended no more than the 80 amp because of the loss of HP which I could ill afford.
If you have HP to spare...go for it. If not reconsider. 1981 40-2 David F. Risch (401) 419-4650 (cell) ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com> on behalf of Josh Muckley via CnC-List <cnc-list@cnc-list.com> Sent: Monday, October 16, 2017 12:47 PM To: cnc-list@cnc-list.com Cc: Josh Muckley Subject: Re: Stus-List New Engine, now what size alternator 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<mailto: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/<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsvjohannarose.blogspot.com%2F&data=02%7C01%7Cdavidrisch75%40msn.com%7C174374313e324a76649608d514b5ae0e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636437692893291062&sdata=3Z6nZDYREvjXOkTwuBgdW3OftsiN%2B4KI22XBkKfEUaQ%3D&reserved=0> On Oct 14, 2017, at 2:02 PM, cnc-list-requ...@cnc-list.com<mailto: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<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.paypal.me%2Fstumurray&data=02%7C01%7Cdavidrisch75%40msn.com%7C174374313e324a76649608d514b5ae0e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636437692893291062&sdata=7kc%2FxlWlAIBdFI5P498w2ktOhdYBxaO1jBXoIheJqII%3D&reserved=0> 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!
