The use of solar power generating system established, now is much used especially on off grid system. There is the usual monitoring by the system to do for 24 hours nonstop. By using ESP8266 NodeMCU as the main component for wireless box volt meters and the expected to measure voltage output of solar panels and can send data to the user through the application of blynk. Overall the methodology used in the study were directly involved in the procurement to the solar system on Muhammadiyah Boarding School (MBS). The result is a wireless box volt meters capable of measuring output and distribute data to be displayed on blynk users.