better

main.go

@@ -138,14 +138,19 @@ func main() {
 	flag.Parse()
 
 	// Is the inverter reachable?
+	var sgc *sungrowConn
 	for _, addr := range strings.Split(*inverterAddrs, ",") {
-		sgc, err := dialSungrow(addr)
+		conn, err := dialSungrow(addr)
 		if err != nil {
-			log.Fatalf("Couldn't dial inverter: %v", err)
+			log.Printf("Couldn't dial inverter: %v", err)
 		}
-		defer sgc.Close()
+		sgc = conn
+		defer conn.Close()
 		break
 	}
+	if sgc == nil {
+		log.Fatal("Couldn't dial any addresses, aborting")
+	}
 
 	// HTTP setup
 	http.Handle("/metrics", promhttp.Handler())