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I read that the 80 amp charger has the backup built in to the charger. So ether battery should work but the smaller battery just won't last as long. I can't remember how much the 80 amp charger cost but it was around $500It looks like the 80amp charger is an option for the standard range battery. I'm wondering if you'll be able to back-feed your house with that combination or will you need the extended range battery.