diff --git a/charger/etrel.go b/charger/etrel.go
index 5ce5b59628..3af59a14bd 100644
--- a/charger/etrel.go
+++ b/charger/etrel.go
@@ -25,6 +25,7 @@ import (
 	"github.com/evcc-io/evcc/api"
 	"github.com/evcc-io/evcc/util"
 	"github.com/evcc-io/evcc/util/modbus"
+	"github.com/evcc-io/evcc/util/sponsor"
 	"github.com/volkszaehler/mbmd/encoding"
 )
 
@@ -83,9 +84,9 @@ func NewEtrel(uri string, id uint8) (*Etrel, error) {
 		return nil, err
 	}
 
-	// if !sponsor.IsAuthorized() {
-	// 	return nil, api.ErrSponsorRequired
-	// }
+	if !sponsor.IsAuthorized() {
+		return nil, api.ErrSponsorRequired
+	}
 
 	log := util.NewLogger("etrel")
 	conn.Logger(log.TRACE)
diff --git a/templates/definition/charger/etrel.yaml b/templates/definition/charger/etrel.yaml
new file mode 100644
index 0000000000..6efaa3851d
--- /dev/null
+++ b/templates/definition/charger/etrel.yaml
@@ -0,0 +1,22 @@
+template: etrel
+products:
+  - brand: Etrel
+    description:
+      generic: INCH
+  - brand: Sonnen
+    description:
+      generic: sonnenCharger
+capabilities: ["mA"]
+requirements:
+  evcc: ["sponsorship"]
+  description:
+    de: Die Wallbox muss sich im "Power" Modus befinden.
+    en: The charger must be switched to "Power" charging mode.
+params:
+  - name: host
+    required: true
+  - name: port
+    default: 502
+render: |
+  type: etrel
+  uri: {{ .host }}:{{ .port }}
diff --git a/templates/docs/charger/etrel_0.yaml b/templates/docs/charger/etrel_0.yaml
new file mode 100644
index 0000000000..b4b21502ab
--- /dev/null
+++ b/templates/docs/charger/etrel_0.yaml
@@ -0,0 +1,13 @@
+product:
+  brand: Etrel
+  description: INCH
+capabilities: ["mA"]
+requirements: ["sponsorship"]
+description: |
+  Die Wallbox muss sich im "Power" Modus befinden.
+render:
+  - default: |
+      type: template
+      template: etrel
+      host: 192.0.2.2 # IP-Adresse oder Hostname
+      port: 502 # Port # Optional
diff --git a/templates/docs/charger/etrel_1.yaml b/templates/docs/charger/etrel_1.yaml
new file mode 100644
index 0000000000..f259fb9e78
--- /dev/null
+++ b/templates/docs/charger/etrel_1.yaml
@@ -0,0 +1,13 @@
+product:
+  brand: Sonnen
+  description: sonnenCharger
+capabilities: ["mA"]
+requirements: ["sponsorship"]
+description: |
+  Die Wallbox muss sich im "Power" Modus befinden.
+render:
+  - default: |
+      type: template
+      template: etrel
+      host: 192.0.2.2 # IP-Adresse oder Hostname
+      port: 502 # Port # Optional
diff --git a/templates/evcc.io/brands.json b/templates/evcc.io/brands.json
index 659003ac4e..61315365b9 100644
--- a/templates/evcc.io/brands.json
+++ b/templates/evcc.io/brands.json
@@ -12,6 +12,7 @@
   "Easee",
   "Ebee",
   "Ensto",
+  "Etrel",
   "Garo",
   "go-eCharger",
   "HardyBarth",
@@ -30,6 +31,7 @@
   "Pracht",
   "SENEC",
   "SMA",
+  "Sonnen",
   "Stark in Strom",
   "TechniSat",
   "TinkerForge",