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Thanks Tony, if I ever get this figured out and implemented I'll be sure to keep an eye on the stored power and not let it completely deplete LOL! I have a grid-tied solar array that, during a power outage will still provide me (via an integrated 3 prong outlet) 1500 watts at 12 amps; providing the sun is shining. I'm hoping I can utilize this to intermittently recharge the Spark - another endeavor I'm unsure of. My complete lack of understanding in the field of electronics keeps me from moving forward. Can you tell me, is there a method to calculate how large an inverter my Spark 12 volt battery can accommodate without damage? I'd like to be able to at least cycle my refrigerator on and off and the mfg tells me that  1500 watts is adequate for that. By the way, all you folks who are offering your experience and expertise are appreciated.