Join Date: Aug 2006
Location: Arlington, VA
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Re: Lifeline Batteries
Again, you persist in trying to perpetuate a myth and flatly erroneous advice.
I read your original. It was WRONG. I read your reply. It was again...WRONG.
And, I wasn't even into the Mt. Gay yet :-)
Let me put it as clearly as I can:
1. Yes, all batteries in a given bank, like the house bank, should be of the same size and type; and
2. The start battery can be of any size, but should be of a compatible type. It's amp hour capacity has NOTHING to do with the size of the batteries in the house bank.
You have a house bank of 1,000AH capacity. You have a single start battery of 100AH capacity. No problem. At all. You use a voltage follower device or an ACR to maintain the start battery.
This is how hundreds, no thousands, of boats are set up.