Re: What's the Difference?
I think the monitor (Magnum ME-BMK Battery Monitor Kit ... I think this is it) would be worth it. I see SMB charges $318. The unit on-line (if it's the same one) is about $150, but installation could be tricky and, to me, would be worth the extra $150 or so that SMB wants ... I would love to have one, but would need someone to install it.
One questions would be how it works if you have 2 house batteries?