Sowillo Solar thermal differential controller intended for solar water heating applications. It controls and monitors the water circulation system based on the difference in temperature between the solar collector and the storage tank or pool. This version of the controller supports direct power from a PV panel (DC Power Shield 7V-50V) or AC power (AC Power Shield 85-265V) and 3.6V Li battery backup (battery not included). Monitoring provided by Sowillo Cloud (subscription).

Specifications: Connectivity (Wired): Modbus, Serial, I2C, SPI; Connectivity (Wireless): WiFi, BLE; Measurement: digital temperature sensors DS18B20 (any amount supported), AC current; Outputs: 12A (motor/valve/lamp output), 16A (heater output), 16x 10A relays (I2C extension board) Inputs: Buttons, Digital 3.3V PCB dimensions 85x75 mm