Join Date: Feb 2011
Location: San Francisco Bay area
Thanked 70 Times in 70 Posts
Rep Power: 6
Re: Battery water level
I think what is happening is that the two banks are charged together at the same rate. Therefore, the bank that was not discharged, by being used, will get warmer and use electrolyte at a higher rate - this is inevitable.
I have a simple two bank system with 1/2/both/off switch. I always alternate which bank is used for a daysail, according to the date. Even days - bank 2, odd days bank 1. This is partly to even out the use and the electrolyte consumption.
It's hard to come up with too much of a suggestion because you haven't explained your charging arrangement, which is obviously somewhat fundamental to understanding the problem.
Bristol 31.1, San Francisco Bay