One more thing. If you put in a intertie with off grid option you're better off than a solo off grid only set up. Here's why:
You run your house on the grid selling back your surplus to the grid. Your batteries stay charged and fresh. When the grid goes down, those batteries save you. You're not charging and depleting them on a daily basis. Batteries are rated for charge cycles. Every time you charge and discharge batteries they lose some of their life so you want to keep your charge cycles to a minimum.
Let the grid keep your batteries charged and sell your extra power back to it.
Rob
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