With the help of Smart Energy Logics, various conditions can be defined for when an additional load is to be activated, for example at a certain surplus level. Different devices are available to physically switch on the appliances. Depending on the specific purpose, the Solar-Log™'s potential-free internal relay, a Smart Plug, the Smart Relay Box or the Smart Relay Station can be used. An appliance can be controlled directly via the internal relay of the Solar-Log™. The Smart Relay Box provides eight additional relays for the data logger to use. The Smart Relay Station can be switched up to three appliances on and off directly; it also records their consumption from these appliances via an internal meter.