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I'm putting together a 48 volt 200ah LiFepo4 battery for solar back up. Not connecting to the grid at this time. What is a good (fair priced) and appropriate battery controller charger?

I have 15 lifepo4 3.2 200ah cells. I have some experience working with batteries in the military, mostly Nicholl cadmium. I want to build a 48 volt 200ah battery for the solar system back up. I'll need to find a battery box and the correct BMS. Any helpful tips much appreciated.

I want to build a a back up system for power outages but then able to expand it later to be the main source of power. I can build my own panels but need to know what is the best efficient solar cells to buy and where? (monocrystalline N type?) I would like to build 2 to 4 425 watt solar panels...