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Hi OldGuy, welcome to the forum. Sounds like you've set up a nice system.
First question that comes to mind: how much of an improvement have you measured?
I assume you are using a 12v charger to top up when you get home. On the return leg, knowing you're close to a charger, and knowing the battery's state of charge, you could use your switch to shut the alternator down completely and arrive home for a fresh recharge. That strategy would net measurable gains (assuming you're not discharging the battery so deeply as to damage it or dramatically shorten its life, negating the financial savings).
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