REFUlog is a free mobile portal developed by REFU Elektronik GmbH for monitoring solar power output. This Android-based app provides users with real-time information on the power output, generated income, and energy of their solar systems. The app is designed to be user-friendly, with an intuitive interface that allows users to easily navigate through the various features.

The app is a great tool for monitoring the performance of your solar system. It provides detailed information on the power output of your system, allowing you to track and analyze its performance over time. The app also provides information on the amount of energy generated by your system, as well as the income generated by selling excess energy back to the grid.

Overall, REFUlog is a great app for anyone looking to monitor the performance of their solar system. It is easy to use, provides detailed information, and is completely free. If you are looking for a reliable and user-friendly way to monitor your solar system, then REFUlog is definitely worth checking out.