David, I don’t know much about the LinkPro, so I can’t say how it shows you data (but I bet Street-Smarts Fred Street can.)
On my Link 2000, it shows me time left at the current draw. For example, if I put on my cabin LEDs, it shows 250 hours. When I put on my running lights, I’ll see 230 hours and so on. I would imagine running my fridge would really take that down. As a personal general rule, I never want my batteries to drop below 50%. I do not have to know the the draw of specific items. The key is in installation (placement of the shunt.) All the best, Edd Edd M. Schillay Starship Enterprise C&C 37+ | Sail No: NCC-1701-B City Island, NY Starship Enterprise's Captain's Log <http://enterpriseb.blogspot.com/> > On Feb 12, 2018, at 4:24 PM, David Knecht via CnC-List > <cnc-list@cnc-list.com> wrote: > > Hi Edd- I have considered one of those devices, but it seems you have to > still have to know the rate of draw of the refridgerator,fans,lights and what > is the acceptable lowest voltage/charge of the house battery. I guess that > device will tell you the rate of draw in amps. If I know those parameters, > it seems to me it should be just as good to look at the voltage in the > evening and know that you do or do not need to charge the battery before > going to bed or turn off the fridge. So I guess the question is: > 1. What is the lowest voltage you can safely let your house battery get to? > 2. How would you measure the overnight draw on the battery if power is left > on to fans +fridge + lights to prevent going lower than that battery voltage > given that the fridge draw is not continuous. > Dave > >> On Feb 12, 2018, at 3:23 PM, Edd Schillay via CnC-List >> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: >> >> David, >> >> While there are calculations you can use, rate of battery discharge is also >> affected by battery age and temperature. >> >> And, since I’m really, really good at spending other people’s money, I’d >> suggest installing a Battery Monitoring System: >> https://www.defender.com/product3.jsp?path=-1%7C328%7C2289954%7C2289950&id=1130644 >> >> <https://www.defender.com/product3.jsp?path=-1|328|2289954|2289950&id=1130644> >> >> >> I have a similar system on the Enterprise — A Heart Interface Link 2000. See >> https://www.ebay.com/itm/Xantrex-Heart-Interface-Link-2000-Complete/132499499047?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20160908110712%26meid%3Dfe0fb3de9f6c425585c79ccae997251d%26pid%3D100677%26rk%3D1%26rkt%3D4%26sd%3D302615330618%26itm%3D132499499047&_trksid=p2385738.c100677.m4598 >> >> <https://www.ebay.com/itm/Xantrex-Heart-Interface-Link-2000-Complete/132499499047?_trkparms=aid=222007&algo=SIM.MBE&ao=1&asc=20160908110712&meid=fe0fb3de9f6c425585c79ccae997251d&pid=100677&rk=1&rkt=4&sd=302615330618&itm=132499499047&_trksid=p2385738.c100677.m4598> >> Properly installed and programed, you can see how much time you have left >> on your house bank with the draw you are using at any given time. >> >> All the best, >> >> Edd >> >> >> Edd M. Schillay >> Starship Enterprise >> C&C 37+ | Sail No: NCC-1701-B >> City Island, NY >> Starship Enterprise's Captain's Log <http://enterpriseb.blogspot.com/> >> >> >> >>> >>> On Mon, Feb 12, 2018 at 3:01 PM, David Knecht via CnC-List >>> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: >>> This discussion raises an issue I have struggled with as I have started >>> cruising more: deciding how much battery power I have. I have 2 AGM >>> batteries, one house, one starting and a panel voltmeter for monitoring. >>> My batteries are now separated so I no longer have to worry about being >>> able to start the engine if I run the house too low. The fridge is the only >>> major power draw, so I usually am just conservative, running it only >>> periodically to make sure I don’t overdraw the battery. So what is the >>> most efficient way to figure out how much I can safely run the fridge? If >>> I just watch the voltage, how do I decide if I can leave the fridge on >>> overnight? Dave >>> >>> Aries >>> 1990 C&C 34+ >>> New London, CT >>> >>> <pastedGraphic.tiff> >>> >>>> On Feb 12, 2018, at 2:33 PM, Josh Muckley via CnC-List >>>> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: >>>> >>>> Much of your problem is a matter of battery capacity as much as a matter >>>> of charging capacity. I have ~450 Ah of capacity on one bank, a 90 Amp >>>> alternator that never reaches full load, and 200 watts of solar. Even >>>> without the solar I was able to comfortably keep the the fridge running >>>> and the lights on when cruising for ~2 weeks. The half hour to hour of >>>> engine operation to anchor or moore in the evening and the same in the >>>> morning was always enough to keep the batteries charged. >>>> >>>> Keep in mind that the battery capacity should be at least 4x of the charge >>>> capacity for flooded lead acid and at least 2x for AGM. So a 400 Ah or >>>> 200 Ah respectively for a 100 amp alternator. >>>> >>>> Josh Muckley >>>> S/V Sea Hawk >>>> 1989 C&C 37+ >>>> Solomons, MD >>>> >>>> >>>> >>>> On Mon, Feb 12, 2018, 12:55 PM Damian Greene via CnC-List >>>> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: >>>> A question for your collective wisdom: >>>> >>>> I am scoping out upgrading my stock 55A alternator to a 100A Balmar, and >>>> related upgrades to the controls. I had a very productive discussion with >>>> Rod Collins at Compass Marine (mainesail), and we worked out the details. >>>> Unfortunately he's booked out through the spring, so this job will wait >>>> until next winter. >>>> >>>> So thinking then about keeping the batteries charged, and the fridge >>>> running on our long summer cruise - where we may go for weeks without >>>> access to shore power, I got wondering about using a portable generator to >>>> charge the batteries - as an alternative to many hours of running the >>>> diesel. There are a couple of Hondas that might do the trick 2000 Watt, >>>> weighing 47#, 1000 Watt weighing 29#. >>>> >>>> Have any of you tried this? What could (would) go wrong if I plugged this >>>> generator into my inverter, to charge the batteries? >>>> >>>> Regards, >>>> >>>> Damian >>>> >>>> 1986 Sabre 38 Freefall >>>> Previously 1984 C&C 34 Ghost >>>> Bass Harbor, Maine >>>> _______________________________________________ >>>> >>>> Thanks everyone for supporting this list with your contributions. Each >>>> and every one is greatly appreciated. If you want to support the list - >>>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>>> <https://www.paypal.me/stumurray> >>>> >>>> _______________________________________________ >>>> >>>> Thanks everyone for supporting this list with your contributions. Each >>>> and every one is greatly appreciated. If you want to support the list - >>>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>>> <https://www.paypal.me/stumurray> >>>> >>> >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each and >>> every one is greatly appreciated. If you want to support the list - use >>> PayPal to send contribution -- https://www.paypal.me/stumurray >>> <https://www.paypal.me/stumurray> >>> >>> >>> >>> >>> >>> -- >>> Joel >>> 301 541 8551 >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each and >>> every one is greatly appreciated. If you want to support the list - use >>> PayPal to send contribution -- https://www.paypal.me/stumurray >>> <https://www.paypal.me/stumurray> >>> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each and >> every one is greatly appreciated. If you want to support the list - use >> PayPal to send contribution -- https://www.paypal.me/stumurray >> <https://www.paypal.me/stumurray> > Aries > 1990 C&C 34+ > New London, CT > > <pastedGraphic.tiff> > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
