|Boat blog-unrelated shot of one of the two flight-capable Lancaster bombers left on Earth overflying National Yacht Club. It's important to lift one's eyes from the task occasionally.|
A spate of work on the homefront meant that my battery bank was both unhooked to the DC side and off charger. Even with the installation of the galvanic isolator, I do not believe there's a compelling reason to leave the charger on unattended for a week, not when I have suspicions concerning the quality of the shore power setup.pecific gravity of each of the battery cells (18 in all in a six 6 VDC batttery bank). Initial readings were between 1.250 and 1.260, or "not bad", even uncorrected for temperature for my somewhat toasty vessel. The initial voltage was 12.47 VDC, "corner pos to corner neg", (recall that I am treating my house bank as one large 12 VDC battery), which was also indicative of pretty good health. The science of measuring battery state of charge and health (as judged by its ability to reach 100% of its rated capacity) is somewhat daunting and I claim no scientific expertise. I do think I now grasp enough to handle the basics, however.
|Well, best hook this up then.|
I then charged the bank until only a trickle of amps was being provided in the "float stage" from my charger. After an hour's rest (off charger completely), I registered 13.04 VDC. Measurement of each of the individual flooded cells gave SG readings of circa 1.275. All the batteries are therefore deemed fit.
|Behold the Skil 18 x 3 belt sander.I bought it (on sale, of course) to refinish red oak stair treads. Little did I know...|
I was, however, thinking that it had been a hot summer here and that my battery temperature monitor had frequently reported case temperatures of over 31C/88F. That in itself is no biggie, but I wanted to check the electrolyte levels nonetheless. So I thought I'd do a minor cosmetic job first.
|Evidence that sloppy power washing will haunt one's decks.|
|Still needs some finalizing, but better than it was.|
|Also, don't sweat into the batteries. It's an amateur move.|
|Click, and we are done.|