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First off, if you start deep cycling your starting battery it will die fairly quick. They simply aren't made to do that. Second, if you recharge from the alternator its just as bad doing it now vs later (unless later is always during braking, aka regenerative braking). Also, the radio and fan don't use any power if they aren't on (ok, the radio uses a tiny amount, not worth removing anything). You definitely need to keep the cabin fan for defogging the windows and heat. I dunno, I think your way is way more complex and more inconvenient than just disabling the alternator, getting a deep cycle battery, and charging from an outlet. I've been running for over a year with my alternator disable and it works great.
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