Overview of my battery backup power system. Tracer 4210RN charge controller 40A MPPT. Canadian Solar CS6P-225P 225 watt single solar polycrystalline panel. Commercial NiCad battery bank - 3 rows of 200Ah 12volts. Charge controller has a lighting output. This output is cut off if battery drops voltage drops too low. Has two timers on this output for night lighting applications, etc.