Shelly gen1 EM: return positive power (#7088)

meter/shelly/switch.go

@@ -3,6 +3,7 @@ package shelly
 import (
 	"errors"
 	"fmt"
+	"math"
 	"strings"
 )
 
@@ -56,7 +57,8 @@ func (sh *Switch) CurrentPower() (float64, error) {
 		}
 	}
 
-	return power, nil
+	// Assure positive power response (Gen 1 EM devices can provide negative values)
+	return math.Abs(power), nil
 }
 
 // Enabled implements the api.Charger interface
@@ -141,7 +143,7 @@ func (sh *Switch) TotalEnergy() (float64, error) {
 
 // gen1Energy in kWh
 func gen1Energy(devicetype string, energy float64) float64 {
-	// Gen 1 Shelly EM devices are providing Watt hours, Shelly EM devices are providing Watt minutes
+	// Gen 1 Shelly EM devices are providing Watt hours, Gen 1 Shelly PM devices are providing Watt minutes
 	if !strings.Contains(devicetype, "EM") {
 		energy = energy / 60
 	}

templates/definition/meter/shelly-1pm.yaml

@@ -6,7 +6,7 @@ products:
 group: switchsockets
 params:
   - name: usage
-    choice: ["pv"]
+    choice: ["pv", "charge"]
   - name: host
     default: 192.0.2.2
   - name: user

templates/docs/meter/shelly-1pm_0.yaml

@@ -12,3 +12,12 @@ render:
       user: # Benutzerkonto (bspw. E-Mail Adresse, User Id, etc.) # Optional
       password: # Passwort des Benutzerkontos (bei führenden Nullen bitte in einfache Hochkommata setzen) # Optional
       channel: # Optional
+  - usage: charge
+    default: |
+      type: template
+      template: shelly-1pm
+      usage: charge
+      host: 192.0.2.2 # IP-Adresse oder Hostname
+      user: # Benutzerkonto (bspw. E-Mail Adresse, User Id, etc.) # Optional
+      password: # Passwort des Benutzerkontos (bei führenden Nullen bitte in einfache Hochkommata setzen) # Optional
+      channel: # Optional