[C320-list] 4D Batteries

[Arthurpiotrowski]

Thanks for your advice 

Sent from Artur’s phone

> On Apr 16, 2024, at 10:05 AM, P.F. Ross via C320-list <c320-list at lists.catalina320.com> wrote:
> 
> Art,
> 
> A potential problem with simply hooking up your charged Group 27 battery to
> a dead 4D, is that that battery pair will soon assume a voltage level
> somewhere between the two, perhaps not leaving you with enough voltage to
> push the current needed for your starter.
> 
> A better setup, albeit one that requires a fair amount of work, is to have
> the reserve Group 27 battery on its own circuit through the battery switch
> with the two 4Ds in parallel as the house battery.  There is much
> documentation on the website as to how other owners have done this.
> 
> I have always found marinehowto.com a very helpful site, so you may want to
> take a look at this article:
> https://marinehowto.com/1-2-both-battery-switch-considerations/
> 
> Frank Ross
> Beta Wave #206
> Naples, FL
> 
>> On Tue, Apr 16, 2024 at 9:30 AM Arthurpiotrowski via C320-list <
>> c320-list at lists.catalina320.com> wrote:
>> 
>> Hello everyone and thank you for your input, great discussion. My question
>> is about a separate battery kept for emergency use. I have one as well,
>> group 27, with jumper cables stored nearby on the boat. I never had to use
>> it, i think I would just connect it to one of my 4D battery in parallel to
>> jump it and be able to crank the engine. Any concerns here?
>> 
>> -Art Piotrowski
>> C320 #330
>> 
>> Sent from Artur’s phone
>> 
>>> On Apr 14, 2024, at 9:57 PM, Troy Dunn via C320-list <
>> c320-list at lists.catalina320.com> wrote:
>>> 
>>> The short answer to your original question is simply no.  It is
>> unrealistic
>>> to expect a single 4D battery to power your energy needs for more than a
>>> day or so at anchor.   A typical 4D is going to give you about 110 Ah of
>>> usable energy at 50% depth of discharge.  The typical fridge is going to
>>> draw about 2.5Amps per hour on average (obviously a lot of factors here).
>>> Add in all your other basic comforts like lights, and radio, etc and you
>>> will be pushing the limits of both 4D batteries and risking a call to
>>> TowBoat US for a jump start.  Our current setup gives us  232 Ah of
>> usable
>>> house bank energy and that is just enough to get us through 2 days at
>>> anchor assuming we were fully charged when we left the marina and a 4-5
>>> hour sail with no alternator use.   (we have a seperate group 27 battery
>> as
>>> a reserve for emergencies only).    Unable to answer your question about
>>> best 4D.   For me the best 4D is not having one on the boat.    But
>> that’s
>>> a debate for a different post.
>>> 
>>> Troy Dunn
>>> Hull #514
>> 
>>