The IoTMeter application offers complete setup and user interface for IoTMeter, Smartmodule, and PV-router devices. The IoTMeter device is used to measure basic electrical quantities (voltage, power, current, etc.). Additionally, IoTMeter allows control of the EVSE (Electric Vehicle Supply Equipment) charging current, which is influenced either by the current household consumption or by the production of a photovoltaic power plant. The PV-router is a smart Wi-Fi control system with a wattmeter for optimizing the utilization of overflows from a photovoltaic power plant into heating appliances and hot water storage such as boilers, storage tanks, pools, etc. It enables direct wireless communication with PV inverters, heat pumps, or operates as a standalone function.