I don't know what type of setup you have regarding the house and starting battery. Is it a switch, acr, or echo-charge? Depending on the answer, yes a failed start battery could affect the entire system.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mon, Jul 16, 2018, 8:20 AM Danny Haughey via CnC-List < cnc-list@cnc-list.com> wrote: > well, the battery was showing 12.7 by the time I got it back to the boat. > It would not start the engine. I did jump start it and found the > alternator was putting out 14.4 volts. So I ran out and bought an > interstate starting battery. I installed that, started the engine and got > 14.4 volts at the battery terminals with the engine running. Then, I went > sailing! > > Anyway, my question now is, if the starting battery was not taking the > charge, would the alternator just keep trying to charge the starting > battery and never reach a full charge so never send anything to the house? > In essence, the spent battery was the break in the system like a bucket > with a big hole in it? > > On 7/15/2018 8:50 AM, Josh Muckley via CnC-List wrote: > > 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 > > > _______________________________________________ > > 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 > >
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