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.
Uses D1 Mini with configuration stored in RTC memory. Data updates every 10 minutes here and on https://aprs.fi/W4KRL-15. The device is housed in an AcuRite Instrument Shield. Near-term (12-hour) forecast uses the Zambretti algorithm.
Simple weather station by using Ti HDC1080 temperature & RH sensor and ESP8266 module configured in deep sleep mode. The whole unit is powered by 1000mAH lipo battery and a small solor panel (below 1W).