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ive done quite a bit og work with electrical systems in cars being the owner of a car audio shop and in my experience you dont really want the voltage dropping too far below 11.5v, this is where you will reduce the life of most lead acid batteries if you stay under it, if you have deep cycle batteries you can probably go down to 11 or 10.8v before you risk shutting down computers and stuff but this is probably pushing it, if i put a switch on my alt i would never let it go below 11v
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