ESP8266-01 + BME280 + 5V 60mA Solar Panel + 2x AA NiMH rechargeable batteries https://github.com/preechaim/esp8266-bme280-ts

Currently, this Nodemcu is used to measure the capacity from recycled 18650 notebook batteries. Values maybe empty before new battery start.

Air temperature and humidity, including air pressure and inside air quality sensors running on an ESP32 and a solar powered ESP8266.

Solar powered wifi weather station in Kistarcsa, Hungary

Soil Moisture MeteoFabro 01

Battery Monitor Reading from my BMV 700

Keeping track of my solar charge controller

Beehive scale from minebier.dk

Battery data send by Android Tasker application.

Solar WiFi Repeater

Solar MPPT charger for garden light

Battery powered weather station, charged from solar panels. Sensors include... BMP180 (Pressure), SI7021 (Humidity), DS18B29 (Outside & internal temperature), INA219 (Battery Voltage & Charge Current), Small solar panel (Measure light level). Upda

Solar/Battery power source

House monitoring