Solar hot water panels. Controlled with ESP8266 Wemos D1 mini. Pump turns on to pump water when it's hotter outside.

Data from a solar Wifi station in Burela, Spain

A solar battery charger to charge lithium ion (li-ion) 18650, 9V, and coin batteries and Ni-MH AA and AAA batteries.

4 x 65W solar panels in series, Arduino as a sensor board and data upload handled by a ESP8266.

ESP-32/BME280 combo, solar power with LiPo battery. Location: Immelstetten, Bavaria, Germany.

Solar

Monitored Solar Voltage, Current, Temperature and Humidity

Monitor and control the homes electrical consumption, heating system and solar.

meteostation with battery and solar cell

ESP12-E in a solar-powered case, reading temperature, pressure, humidity and current/voltage of Lipo cell. Positioned in direct sun until 17.00. Inner temperature of enclosure might be a problem for the Lipo.

Casanayan Local Weather Sensors. Barometric pressure and temperature

Data from Victron BMV

Solar powered camera and doorbell at Lumley Park middle gate

Wetterdaten aus dem Brühl Solar Powered ESP8266 with BMP180

Replaced with 20c after 801 lost in flood