I am rebuilding the electrical system (and everything else) in our Albin Vega 27'. I would like to use a slightly simplified version (smaller banks, no AC charger) of this diagram ...
... utilizing a 1/2/BOTH/OFF switch, wired as a "use switch", as shown in this drawing from Maine Sail's original post:
Resulting in the following rough draft of what I hope to build:
Based on Maine Sail's comments earlier in this thread, I have added an on/off switch to isolate the house bank, and another to isolate the starter. Just a couple questions:
- The reserve/starting battery is isolated by the 1/2/BOTH/OFF switch whenever it is not in use, so no other on/off switch is needed, correct?
- The batteries can never be combined, given the wiring of the 1/2/BOTH/OFF, so is a starter isolation circuit even necessary?
- One other thing (not engine-switch specific, I apologize): in the original diagram, the negative lead from the MPPT controller runs only to the ACR. Neither device is grounded to the foundation. Can this be correct??
Thank you, thank you, thank you to Maine Sail, and everyone else who has helped to build this amazing thread. I've been following it for the past two years. A wealth of knowledge and information is contained here. I would absolutely have to hire an electrician for this job, if not for you guys.
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