Originally Posted by MarkJ
I can't see how double the number of 6 volt batteries is a useful thing on a boat. All the extra connections in a race
to see who can corrode fastest.
If your boat is 12v why have 6 v and then make it 12v? Just plum crazy, Aunt Alfafa.
Then the inverter
: 6v to 12 v to 110 or 220v. Like hows that a good idea?
Because 6V batteries are a better deep cycle design lending to longer life and more cycles. They also usually cost a lot less..
For example Trojan rates their 6V T105's at double the cycles as their 12V marine
should not happen on any battery. If it is happening you are simply not taking care of them regularly and not using a good terminal grease.
Also in most installations when compared Ah to Ah, and foot print to foot print, a series / parallel bank will very often have less connections than a parallel wired 12V bank..
Take a 450Ah bank of 6V GC2 batteries there are only 10 connections.
Like this 450Ah bank of 6V GC2's:
To get to 450Ah in 12V group 31's this would require at least four 12V batteries and would result in at least 14 connections.
Like this 400Ah AGM
To get to 450Ah in 12V group 24's would require at least six batteries and result in 22 connections..
Here is a 6V series bank of 390Ah and just 4 connections...
And here is 210 Ah's of 12V batteries with 6 connections. That 390Ah 4 connection bank takes up the same foot print as this 210Ah bank only it is taller..
Course this is how many 12V banks look before I get to working on them...
And this is one reason the battery connections don't worry me..