... with 53 systems 2, Various protections for solar system, 3, solar controller with Touch screen operation ModelPSC-500Power supply AC230V ±10 ... 6 sensors2 piece Pt1000 sensor(≤500°C) for collector (silicon cable≤280°C), Sensor for collector4 pieces NTC10K, B3950 sensor (≤ ... 135°C) for tank, (PVC cable ≤105°C),Sensor for tankOutputs5 relays, for circulation pumps or ...