[C36IA] Deck Light
Gene Foraker
gforaker at gmail.com
Tue Jun 23 18:04:00 EDT 2009
You and Bob are probably right, but I think the "expert" I recall was
referring to the most typical situation of a battery being too low to
start the engine. It might even turn it over, but not fast enough to
start. In that very typical situation with a "low" but not "dead"
battery it would be best to leave it attached. I don't recall where
that came from, but will try to look around and find it.
Gene
Bill Micka wrote:
> You would not get any amps from the dead battery until the voltage of the two are equal. As long as the dead battery has a lower voltage, current from the good battery will flow into it, not out. The reason the dead battery does not suck all the good battery amps is usually the dead battery has a very high internal resistance so current does not flow to it as much as it will to the starter. If you leave the two connected for a while with no charger attached, the good battery will drain also.
>
> Bill
> #1693
>
> -----Original Message-----
>
>> From: Bob McCullough <Rmccullough3 at verizon.net>
>> Sent: Jun 23, 2009 4:12 PM
>> To: gforaker at gmail.com, Catalina 36 Association Mailing List <c36list at c36ia.com>
>> Subject: Re: [C36IA] Deck Light
>>
>> Gene:
>>
>> Amps are fine, but if you don't have the voltage it ain't gonna turn the
>> engine over.
>>
>> Bob
>>
>> ----- Original Message -----
>> From: "Gene Foraker" <gforaker at gmail.com>
>> To: <jacksonfa at earthlink.net>; "Catalina 36 Association Mailing List"
>> <c36list at c36ia.com>
>> Sent: Tuesday, June 23, 2009 2:18 PM
>> Subject: Re: [C36IA] Deck Light
>>
>>
>>
>>> I really haven't studied the theory, Fred. You may be right and
>>> fortunately, I haven't had to jump start my boat other than a test. I
>>> don't even take the jump starter along unless planning on anchoring out
>>> for several days.
>>>
>>> I believe that the experts have said that thinking about voltage
>>> differences when starting an engine is "over thinking" it. Amps
>>> available is the important factor and even a "low" battery has some amps
>>> available to kick into the job and will contribute. I can't recall
>>> where I read it though. It might have been Nigel Calder or "12 volt
>>> Bible".
>>>
>>> Gene
>>>
>>> Fred Jackson wrote:
>>>
>>>> Gene,
>>>> When you've only got one good battery left, your jumper, and you're a
>>>> long
>>>> ways from home, don't risk failure. Isolate the jumping battery!
>>>> Fred J.
>>>> Amante #2209
>>>>
>>>>
>>>>
>>>>
>>>>> [Original Message]
>>>>> From: Gene Foraker <gforaker at gmail.com>
>>>>> To: Catalina 36 Association Mailing List <c36list at c36ia.com>
>>>>> Date: 6/23/2009 9:22:10 AM
>>>>> Subject: Re: [C36IA] Deck Light
>>>>>
>>>>> I read a technical article once that unless there is a dead short in the
>>>>> one battery, you should connect the jumping battery to the low
>>>>> battery. Even a very low battery supposedly provides amps to the
>>>>> circuit. In every time I have jumped boat or car this seems to be the
>>>>> case. At least connecting to the low battery terminals doesn't seem to
>>>>> hurt. Any amps that go from the jumping battery to the low battery
>>>>> will then go to the starter when you turn the key.
>>>>>
>>>>> I think it was Jerry and I who had a "discussion" a few years ago about
>>>>> the adequacy of the cheaper jump start battery to start our diesel
>>>>> motors. I tested it by disconnecting the #2 battery bank positive
>>>>> cable from the battery and connecting the jump start battery directly to
>>>>> the positive cable and the negative terminal. No help at all from the
>>>>> disconnected boat battery. The battery easily warmed the glow plugs
>>>>> and started the cold engine. I immediately turned the battery selector
>>>>> switch to the still connected battery #1 before disconnecting the jump
>>>>> starter. You could easily isolate the boat from the dead battery this
>>>>> way.
>>>>>
>>>>> Although my jump starter proved it could start the boat, there does seem
>>>>> to be a lot of variation in these products, perhaps even batch to
>>>>> batch. I suggest you test it at your boat before fully trusting it to
>>>>> be powerful enough.
>>>>>
>>>>> Gene
>>>>>
>>>>> John Van Vessem wrote:
>>>>>
>>>>>
>>>>>> Fred,
>>>>>>
>>>>>> I too use my batteries rather than try to save them. I am interested
>>>>>> in carrying a jump start battery, can you tell me where you connect
>>>>>> them for a jump start. I would think that if your 4Ds are down to
>>>>>> where they will not turn over the engine, connecting the jump start
>>>>>> battery to them would draw the jump battery down to the level of the
>>>>>> 4Ds.
>>>>>>
>>>>>> Also is your jump battery a gel, AGM or something else.
>>>>>>
>>>>>> John Van Vessem
>>>>>> Sojourn #2295
>>>>>> Vallejo Yacht Club
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------
>>>>>> *From:* Fred Jackson <jacksonfa at earthlink.net>
>>>>>> *To:* Catalina 36 Association Mailing List <c36list at c36ia.com>
>>>>>> *Sent:* Monday, June 22, 2009 11:32:47 AM
>>>>>> *Subject:* Re: [C36IA] Deck Light
>>>>>>
>>>>>> John,
>>>>>> You're correct. I replace my 4Ds after five seasons, whether they
>>>>>>
>>>>>>
>>>> appear
>>>>
>>>>
>>>>>> to need it or not. I think it's alot simpler to just replace them
>>>>>> frequently than it is to mess with starting batteries, solar chargers,
>>>>>> wind
>>>>>> chargers, etc.
>>>>>> I did, however, upgrade to a 70 amp alternator and an better regulator.
>>>>>> Also, I carry a portable jump starting battery for extra confidence.
>>>>>> Over a season, I would estimate that I drop voltage in one battery or
>>>>>>
>>>>>>
>>>> the
>>>>
>>>>
>>>>>> other below 12V perhaps once, maybe twice.
>>>>>> Fred J.
>>>>>> Amante #2209
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> [Original Message]
>>>>>>> From: <grifftoe at frontier.net <mailto:grifftoe at frontier.net>>
>>>>>>> To: Catalina 36 Association Mailing List <c36list at c36ia.com
>>>>>>>
>>>>>>>
>>>>>> <mailto:c36list at c36ia.com>>
>>>>>>
>>>>>>
>>>>>>> Date: 6/22/2009 11:52:10 AM
>>>>>>> Subject: Re: [C36IA] Deck Light
>>>>>>>
>>>>>>> Hola, Fred, you're a lucky guy, a diesel that starts on a flat
>>>>>>> battery, and batteries that can take the hammering you give 'em. A
>>>>>>> typical battery is over 50% discharged when it reads 12 volts, 11.5
>>>>>>> volts is a deep discharge. A wet cell battery will only take a
>>>>>>>
>>>>>>>
>>>> limited
>>>>
>>>>
>>>>>>> number of deep discharge cycles, fewer cycles the deeper the
>>>>>>> discharge: a battery discharged to 50% each time may last only 300
>>>>>>> cycles whereas a battery discharged only 15% on each cycle may last
>>>>>>> for 1,000 cycles.
>>>>>>> So, your 4D set is probably on its last legs. Prolong battery life by
>>>>>>> keeping them charged up to 13+ volts.
>>>>>>> Fred, we aren't using more electricity than you, we use less of our
>>>>>>> batteries' capacity though, and we attend to their state of charge.
>>>>>>> --
>>>>>>> John Griffiths
>>>>>>> SV Pegasus C36 #1353
>>>>>>> lying San Carlos, Sonora
>>>>>>> tel (Mexico) 622-112-2619
>>>>>>> http://www.frontier.net/~grifftoe
>>>>>>> -
>>>>>>> Fred Jackson wrote:
>>>>>>>
>>>>>>>
>>>>>>>> I don't understand all this concern about power consumption. We've
>>>>>>>> never had a battery go below 11.5 V, which is still plenty enough
>>>>>>>>
>>>>>>>>
>>>> to
>>>>
>>>>
>>>>>>>> start the diesel. We seldom get one to go below 12V. What do you
>>>>>>>> guys do that we don't do that draws so much? I don't have LED
>>>>>>>> lights, a Honda generator, a wind generator, solar panels or any of
>>>>>>>> that stuff. And my regular wet cell 4D 12V batteries have been
>>>>>>>> through 4 seasons.
>>>>>>>> Fred J.
>>>>>>>> Amante #2209
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>> http://www.c36ia.com/cgi-bin/mailman/listinfo/c36list
>>>>>>>
>>>>>>>
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