With the help of energy meters, the Solar-Log™ can record and visualize the production from a combined heat and power generator (CHP). Only two power meters need to be connected to the Solar-Log™. One of the meters records the current power output and the other one the consumption. When there is a high heat demand, the consumption of power produced by combined heat and power generators (CHP) is optimized and the operating times are shortened in combination with intelligent electrical appliances such as the EGO Smart Heater. This allows unprofitable grid feed-in to be avoided and the Solar-Log™ can be used a central monitoring and control element.