Disconnect for 24 hours and then take the voltage again. Josh
On Sun, Jul 15, 2018, 8:47 AM Danny Haughey via CnC-List < cnc-list@cnc-list.com> wrote: > 12.9 reading with charger off. It's a smart charger and will slow and > then stop charge as battery charges. It is sitting with charger attached > just reading voltage > > > > Thanks, > Danny > -------- Original message -------- > From: Josh Muckley via CnC-List <cnc-list@cnc-list.com> > Date: 7/15/18 8:04 AM (GMT-05:00) > To: cnc-list@cnc-list.com > Cc: Josh Muckley <muckl...@gmail.com> > Subject: Re: Stus-List Charging issues > > 12.9v on or off the charger? That's too low if on the charger. Even the > smallest trickle chargers put out ~13.5v > > It is possible to have a one of the six cells go bad, reducing the > battery's appropriate full charge voltage to 10.6 instead of 12.7 the > charger is dumb and keeps trying to put as much as 14.7 into the battery. > This extra voltage overcharges the battery and boils off electrolyte. > Under this condition the battery voltage may never get to 14.7 but it can > easily get to 12.7. It will quickly decay and stabilize near 10.6-ish when > the charger is removed. This may take a few hours to occur. If/When a > load is applied the voltage will drop dramatically and stabilize near > 10.6v. If this is the case then you need a new battery. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > > On Sun, Jul 15, 2018, 7:29 AM Danny Haughey via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Hi Rick, >> Thank you for the insight. The start battery showed just 12.1 when I put >> it on the charger. I just went out and battery now shows full at 12.9 >> volts. >> >> It seems like the charge isn't getting to the batteries. This is one >> system I haven't dug into yet. I guess that's going to change... >> >> I think I need to find a diagram somewhere >> >> >> >> Thanks, >> Danny >> >> -------- Original message -------- >> From: Rick Brass via CnC-List <cnc-list@cnc-list.com> >> Date: 7/14/18 11:09 PM (GMT-05:00) >> To: cnc-list@cnc-list.com >> Cc: Rick Brass <rickbr...@earthlink.net> >> Subject: Re: Stus-List Charging issues >> >> Generally, yes, if you are showing about 14 volts when the engine is >> running, the alternator is probably OK. >> >> >> >> When you say the start battery is not charging, is it safe to assume that >> the start battery will not start the engine? >> >> >> >> Under normal circumstances, and depending on the Amp-Hour capacity of the >> start battery, it will probably never get below 95% to 99% state of charge. >> (Unless, of course, you are using it to also power your house loads.) >> >> >> >> For example, the 36 HP Universal in my 38 draws 175 amps for about 30 >> seconds in starting, or about 1.4 AH. That is about 1.3% discharge on the >> 105AH deep cycle battery I use for starting. (And only for starting except >> in an emergency) >> >> >> >> So the start battery is capable of reaching full charge in just a few >> minutes of engine run time, and the full output from the alternator then >> gets directed to the house bank if that is at a lower state of charge. If >> both are fully charged, the current flow just creates heat. >> >> >> >> Check your start battery with a volt meter and both engine and battery >> switch turned off. If you get 12.6 volts or more, everything is probably OK. >> >> >> >> If the start battery won’t start the motor, you probably need a new >> battery. >> >> >> >> Rick Brass >> >> Washington, NC >> >> >> >> >> >> >> >> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *Danny >> Haughey via CnC-List >> *Sent:* Saturday, July 14, 2018 7:31 PM >> *To:* cnc-list@cnc-list.com >> *Cc:* Danny Haughey <djhaug...@juno.com> >> *Subject:* Stus-List Charging issues >> >> >> >> So my gauge shows 14amps while motoring but after a long motoring trip my >> starting battery and house batteries are not charging. The house batteries >> charge under shore power. >> >> >> >> I'm taking the starting battery home to throw on a charger to see if it >> will take a charge. If oin l I'm seeing the 14 amps can I assume the >> alternator is working? >> >> >> >> >> >> >> >> Thanks, >> >> Danny >> _______________________________________________ >> >> 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 > >
_______________________________________________ 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
