Measures the relationship between light intensity and solar panel power output. Panel is 80 x 55 mm rated at 6 V 100 mA. An INA219 measures current, voltage, and power output. A TP4056 controls the charge of a 600 mAh cell. Reports every 5 minutes.
In an outhouse we have a wood pellet burner for central heating of the house combined with solar panels and a 500liter accumulation tank. The water heater in the house need to know whether there is warm water in the tank to decide if it will heat th