On Grid or Grid tied solar inverter converter solar DC power to AC power and feed the AC power to Grid, but the power will be used by loads at first, only feed surplus power to Grid; On Grid or Grid tied solar inverter must need workable Grid to run; CoHeart On-Grid inverters or Grid tie inverters have 6-year own patented topologies and structure for cooling! Online upgrading is available with WiFi module! IP65 Outdoor weather proof! Zero-export is available on request to avoid feeding surplus power to Grid than used by local loads!