It all comes together.

Last month the propane fridge we spent way too much on, 7 years ago, gave out.

The month before that I installed a tracking/data system on the new solar array.

We made lemonade. Typically, our draw down on the batteries goes down to 90% SOC (State of Charge) We know this because of the tracking system, even in our lowest solar irradiation month of December. 85% SOC is considered to be in the ultimate range of draw down for a given system, as concerns battery life expectancy. We shopped carefully for a new electric fridge, and settled on one that has a yearly KW usage expectancy of 471 KWH per year. That means basically 1.3 KW per day. That seemed acceptable. As it plays out, the electric refrigerator/freezer takes our worst drawdown to 88% SOC. That's GREAT! It will also save us about $500 per year in propane not used, so the payback on the purchase of the new fridge is about a year and a half.

I know it's geeky and lots of numbers, but I'm happy figuring this crap out. It's ...... fulfilling and satisfying to be able to do this stuff myself.