Also depends on which battery is supposed to be the first one charged.

On Mon, Jul 16, 2018 at 9:36 AM, Josh Muckley via CnC-List <
cnc-list@cnc-list.com> wrote:

> 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
>>>> _______________________________________________
>>>>
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>>>> _______________________________________________
>>>
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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 
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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 -
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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
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>


-- 
Joel
301 541 8551
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