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 <mailto: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
<mailto:cnc-list@cnc-list.com>>
Date: 7/15/18 8:04 AM (GMT-05:00)
To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
Cc: Josh Muckley <muckl...@gmail.com <mailto: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 <mailto: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
<mailto:cnc-list@cnc-list.com>>
Date: 7/14/18 11:09 PM (GMT-05:00)
To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
Cc: Rick Brass <rickbr...@earthlink.net
<mailto: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
<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 <mailto:cnc-list@cnc-list.com>
*Cc:* Danny Haughey <djhaug...@juno.com
<mailto: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
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Each and every one is greatly appreciated. If you want to support
the list - use PayPal to send contribution --
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_______________________________________________
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
