2 group 27 batts. Maintained. switch 1,2,both. Charles 20 amp dual bank.
The 5 year old (June 2011, bought when obtained the boat) Costco is toast. Won't stay above 12.1 v for more than 15 minutes. Although I keep sailing with it and it starts the motor easily after a 3 hour sail with instruments, VHF, AP, etc running. But it's on its way out.
The Deka, 7 years old (April 2009, already on the boat), still holds its volts.
The odd thing is that I heard that Deka made Costco batteries.
I figure about 160 sailing cycles, 80 each. Plus huge amounts of running them dockside while on the charger. But don't really know how much the Deka was used, as it was already on the boat when I got it.
Not a scientific test, but my real world results.
The 5 year old (June 2011, bought when obtained the boat) Costco is toast. Won't stay above 12.1 v for more than 15 minutes. Although I keep sailing with it and it starts the motor easily after a 3 hour sail with instruments, VHF, AP, etc running. But it's on its way out.
The Deka, 7 years old (April 2009, already on the boat), still holds its volts.
The odd thing is that I heard that Deka made Costco batteries.
I figure about 160 sailing cycles, 80 each. Plus huge amounts of running them dockside while on the charger. But don't really know how much the Deka was used, as it was already on the boat when I got it.
Not a scientific test, but my real world results.
