That system seems fine too. I have just been happy using the combiner the last few years and have had excellent longevity out of Seahawks SLA batteries with it. I like the idea of both betteries being conditioned on each trip, especially if I won't be out for a while.
If you are disciplined enought to rotate batteries then forego the ACR.
The yandina combiner is a nice alternative,as well, because it comes with all of the leads and is a simpler install. It does not protect against the voltage drop at startup, though, like the blue seas.
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