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 Catalina/Capri 25/250 Sailor's Forums
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 Advice? Adding 2nd battery and charger		  New Topic  Topic Locked
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windsong
Captain

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USA
318 Posts
Initially Posted - 10/06/2009 :  06:02:46  Show Profile
I'd love to hear anyone's advice before I begin this project. I'm adding a second battery, isolator switch and Xantrex 10TB charger to Windsong. I plan to move the existing battery forward to the starboard locker and put the new battery in the port locker, getting some weight out of the stern. I'd LOVE a schematic, if anyone has one. I haven't decided where to mount the shore power input. Overall, anything to watch out for? Thanks in advance.

Michael Hetzer
"Windsong"
2009 Catalina 250 WK HN984
Myrtle Beach, SC
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 10/06/2009 :  16:51:22  Show Profile
I have both of my batteries in the aft area. Here is how I mounted the electronics (the little round device is a digital 12V meter):



Here is the 120V outlet:



Here is the shore power connection round object forward of the outboard):



I connected the two batteries together so no isolator switch. I'm not convinced a simple 12V system on our boats needs the batteries to be isolated.
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 10/07/2009 :  23:56:07  Show Profile
I agree with Nautiduck, two batteries in one larger bank is fine for a C25. No isolation is needed. Just think of it as a much larger (double) size than one battery. If you have a manual pull on your outboard, you don't need to separate your two batteries, make it into one big bank.
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OLarryR
Master Marine Consultant

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USA
3467 Posts
Response Posted - 10/08/2009 :  03:25:03  Show Profile  Visit OLarryR's Homepage
My batteries are hooked in parallel with no isolator either. I have a 20 watt solar panel that keeps them charged and a digital controller for the panel to monitor the volts/amps, prevent overcharging and drain back thru the panel. I keep my battery switch on 1&2 all the time. I just make sure I turn off all switches on my 2 switch panels (original and the new one I installed).
Edited by - OLarryR on 10/08/2009 03:26:04
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 10/08/2009 :  09:14:49  Show Profile  Visit delliottg's Homepage
We've got two batteries that I just installed about two weeks ago. I mounted them on top of the original battery box using some aluminum "L" brackets an WM battery hold downs. You can read about it [url="http://www.catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=20505&SearchTerms=SL,has,two,new,batteries"]here[/url]. The narrative's a bit spotty, but photos might help, very similar to Randy's install. I was pretty frustrated when I wrote it, so not my best work. There are better pictures towards the bottom.

I chose not to use a switch & simply hooked them up in parallel. We've got an 18 watt solar panel attached to a Sunsei controller that keeps them topped off. It turns out that I may not have had to replace my old battery. I discovered that I was only getting about 5 volts at the other side of my solar controller, but the solar panel was putting out about 18 volts. A couple of minutes with a corrosion buster pen and I was getting 13-14 volts at the regulator, which may have been my problem the whole time. Oh well, at least now I've got two brand new batteries that I know their entire history, where before I knew next to nothing about the original battery.

I know this wasn't exactly the information you were looking for, but maybe it was helpful.
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Turk
Admiral

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USA
736 Posts
Response Posted - 10/12/2009 :  05:01:30  Show Profile  Visit Turk's Homepage
I added 2 batteries to the bow for the extra weight up front.

Here is the link
http://www.elmhurstprop.com/webbat/Photos.html
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.