[QUOTE=GMatthesen;21180]Anyone an electrical engineer or savy person to answer a question. If I put two 6 volt 215 Ah batteries in series, I get 12 volts. What is the Ah rating, still 215 or totaled to 430?
Winter projects, nothing like them...
Thanks
Gary[/QUOTE]
Don't need to be an electrical engineer for this one:
If you put them in series, you end up with 12V and 215AH (that's the same set-up we have). If you put them in parallel, you'd have 6V and 430 AH....

So then you put in 4 X 6 volts in series parallel and you get 12V and 430 amps. That's a pretty standard 6 volt set up and is a good setup for battery longevity and cost.

Check this post from Tom Grover:

[URL]http://www.c36ia.com/forums/showpost.php?p=16240&postcount=4[/URL]

He has 6 X 6 volt, two of them under the chart table. Might be helpful. There's quite a few threads on this topic on the forum, might be worth having a look at a few of them.

Gary,
4 6V batteries will fit under the aft seat of the starboard table. Your 1987 is the same as mine. Where the board (removable sits on a lip) you will have to notch out that lip just the width of the battery to get the last one in. Another benefit is the batteries will balance the boat out. They wheigh approximate 64# each and I had a slight list to port which they helped remove. Somewhere in the archives of this section I believe I shared a picture of the notch with the batteries in place. Because this is where the original 2 batteries were I lost no storage space. The 430 amps is a lot to keep the house going. I set my link monitor to 215 amps so the gauge works its way from the top to the halfway mark. Only in the fall after the boat is on the hard have I experienced the orange warning light.

Gary,

Are you running a refrigerator with this set up? I have 4 x 6V, but the previous owner put 2 batteries in the seat forward of the card table and ran very large gauge cables from one seat to the other to affect the parallel wiring. I don't care for this set up because of distance, but it seems to work so far. Very tough to get the batteries in and out of that area as well as keeping them level. I will look for your picture to see how you got 4 batteries in the aft seat.

Thanks,
Jeff

Gary,
Here is the picture!
Yes I run the refrigeration with this setup. I am working on ways to reduce that draw, but to date it is still a project. Normal procedure during a day I like to run a minimum of one hour to keep the charge up. On an extended trip though I very seldom ever draw off more than 50-60 amps.

Jeff Berman has a Mark II and has placed (6) 6V batteries for his house bank just forward of the galley sink. Don't know if this works on a Mark I.

Golf Cart 6V Battery Wiring [url]http://c34.org/bbs/index.php/topic,7162.0.html[/url]

Just forward of the galley sink on my MK I is the fuel tank…

Jeff