With 3400W PV power and 3000W Whisper 175 wind generator. This controller connects directly to the line inverter and the upgraded wind generator controller. plug and play It will add 2 more kW of PV, so ordered one more for this array. I don't need absorption, so absorption and float are the same. It's confusing, but done in 3 hours. During installation, it showed no output power, but a good wind and a sunny day accelerate the inverter to more than 3KW, and the MPPT is a constant output of 3300W in cool weather. The fan turns on for about 1 minute every 4 minutes it is off. Works perfectly.