diff --git a/meter/sma.go b/meter/sma.go
index 2ea449436..7055c28cb 100644
--- a/meter/sma.go
+++ b/meter/sma.go
@@ -24,13 +24,14 @@ func init() {
 	registry.Add("sma", NewSMAFromConfig)
 }
 
-//go:generate go tool decorate -f decorateSMA -b *SMA -r api.Meter -t "api.Battery,Soc,func() (float64, error)" -t "api.BatteryCapacity,Capacity,func() float64"
-
 // NewSMAFromConfig creates an SMA meter from generic config
 func NewSMAFromConfig(other map[string]any) (api.Meter, error) {
 	cc := struct {
 		batteryCapacity          `mapstructure:",squash"`
+		batteryPowerLimits       `mapstructure:",squash"`
+		batterySocLimits         `mapstructure:",squash"`
 		URI, Password, Interface string
+		Usage                    string
 		Serial                   uint32
 		Scale                    float64 // power only
 	}{
@@ -42,11 +43,24 @@ func NewSMAFromConfig(other map[string]any) (api.Meter, error) {
 		return nil, err
 	}
 
-	return NewSMA(cc.URI, cc.Password, cc.Interface, cc.Serial, cc.Scale, cc.batteryCapacity.Decorator())
+	sm, err := NewSMA(cc.URI, cc.Password, cc.Interface, cc.Serial, cc.Scale)
+	if err != nil {
+		return nil, err
+	}
+
+	if cc.Usage == "battery" {
+		return decorateMeterBattery(
+			sm, sm.TotalEnergy,
+			sm.soc, cc.batteryCapacity.Decorator(),
+			cc.batterySocLimits.Decorator(), cc.batteryPowerLimits.Decorator(), nil,
+		), nil
+	}
+
+	return sm, nil
 }
 
 // NewSMA creates an SMA meter
-func NewSMA(uri, password, iface string, serial uint32, scale float64, capacity func() float64) (api.Meter, error) {
+func NewSMA(uri, password, iface string, serial uint32, scale float64) (*SMA, error) {
 	sm := &SMA{
 		uri:   uri,
 		scale: scale,
@@ -82,20 +96,7 @@ func NewSMA(uri, password, iface string, serial uint32, scale float64, capacity
 	// start update loop manually to get values as fast as possible
 	go sm.device.Run()
 
-	// decorate api.Battery in case of inverter
-	var soc func() (float64, error)
-	if !sm.device.IsEnergyMeter() {
-		vals, err := sm.device.Values()
-		if err != nil {
-			return nil, err
-		}
-
-		if _, ok := vals[sunny.BatteryCharge]; ok {
-			soc = sm.soc
-		}
-	}
-
-	return decorateSMA(sm, soc, capacity), nil
+	return sm, nil
 }
 
 // CurrentPower implements the api.Meter interface
@@ -170,7 +171,14 @@ func (sm *SMA) Powers() (float64, float64, float64, error) {
 // soc implements the api.Battery interface
 func (sm *SMA) soc() (float64, error) {
 	values, err := sm.device.Values()
-	return sma.AsFloat(values[sunny.BatteryCharge]), err
+	if err != nil {
+		return 0, err
+	}
+	soc, ok := values[sunny.BatteryCharge]
+	if !ok {
+		return 0, api.ErrNotAvailable
+	}
+	return sma.AsFloat(soc), nil
 }
 
 var _ api.Diagnosis = (*SMA)(nil)
diff --git a/meter/sma_decorators.go b/meter/sma_decorators.go
deleted file mode 100644
index 2c8d0d155..000000000
--- a/meter/sma_decorators.go
+++ /dev/null
@@ -1,58 +0,0 @@
-package meter
-
-// Code generated by github.com/evcc-io/evcc/cmd/tools/decorate.go. DO NOT EDIT.
-
-import (
-	"github.com/evcc-io/evcc/api"
-)
-
-func decorateSMA(base *SMA, battery func() (float64, error), batteryCapacity func() float64) api.Meter {
-	switch {
-	case battery == nil:
-		return base
-
-	case battery != nil && batteryCapacity == nil:
-		return &struct {
-			*SMA
-			api.Battery
-		}{
-			SMA: base,
-			Battery: &decorateSMABatteryImpl{
-				battery: battery,
-			},
-		}
-
-	case battery != nil && batteryCapacity != nil:
-		return &struct {
-			*SMA
-			api.Battery
-			api.BatteryCapacity
-		}{
-			SMA: base,
-			Battery: &decorateSMABatteryImpl{
-				battery: battery,
-			},
-			BatteryCapacity: &decorateSMABatteryCapacityImpl{
-				batteryCapacity: batteryCapacity,
-			},
-		}
-	}
-
-	return nil
-}
-
-type decorateSMABatteryImpl struct {
-	battery func() (float64, error)
-}
-
-func (impl *decorateSMABatteryImpl) Soc() (float64, error) {
-	return impl.battery()
-}
-
-type decorateSMABatteryCapacityImpl struct {
-	batteryCapacity func() float64
-}
-
-func (impl *decorateSMABatteryCapacityImpl) Capacity() float64 {
-	return impl.batteryCapacity()
-}
diff --git a/meter/usage_battery.go b/meter/usage_battery.go
index 199319711..9cf56337b 100644
--- a/meter/usage_battery.go
+++ b/meter/usage_battery.go
@@ -39,6 +39,8 @@ type batterySocLimits struct {
 	MinSoc, MaxSoc float64
 }
 
+// var _ api.BatterySocLimiter = (*batterySocLimits)(nil)
+
 // Decorator returns an api.BatterySocLimiter decorator
 func (m *batterySocLimits) Decorator() func() (float64, float64) {
 	if m.MinSoc == 0 && m.MaxSoc == 0 {
diff --git a/templates/definition/charger/ochsner-bwwp.yaml b/templates/definition/charger/ochsner-bwwp.yaml
index bcf084eb1..c85c2b011 100644
--- a/templates/definition/charger/ochsner-bwwp.yaml
+++ b/templates/definition/charger/ochsner-bwwp.yaml
@@ -27,7 +27,7 @@ render: |
       id: {{ .id }}
       register:
         address: 2201 # SUR Überschussleistung Auflösung 1 W
-        type: writeholding
+        type: writesingle
         decode: int16
   power:
     source: modbus
diff --git a/templates/definition/meter/sma-inverter-speedwire.yaml b/templates/definition/meter/sma-inverter-speedwire.yaml
index 79ebe9829..4c142b16a 100644
--- a/templates/definition/meter/sma-inverter-speedwire.yaml
+++ b/templates/definition/meter/sma-inverter-speedwire.yaml
@@ -19,6 +19,7 @@ params:
   - preset: battery-params
 render: |
   type: sma
+  usage: {{ .usage }}
   uri: {{ .host }} # IP address or hostname
   password: {{ .password }} # optional
   {{- if eq .usage "battery" }}