Energy Products, Projects and Devices Design SL4-6KRG Inverter PV Grid Connected Inverter by Slenergy Technology (A.H.) Co.,Ltd. SL4-6KRG is a PV grid-connected inverter with the design concept of easy installation and operation. With an integrated design, it uses arc corners and a white-gray glossy surface to show a minimalist style. The integrated structure has excellent IP66 waterproof properties. Users can install it indoors or outdoors in three easy steps. The product has a concise LED display that shows real-time battery power. It also has a relevant APP to provide various data, making it more convenient for users.