diff --git a/plugin/getter.go b/plugin/getter.go
index b693608f3..f9bb73f14 100644
--- a/plugin/getter.go
+++ b/plugin/getter.go
@@ -1,8 +1,6 @@
 package plugin
 
 import (
-	"strconv"
-
 	"github.com/spf13/cast"
 )
 
@@ -30,7 +28,7 @@ func (p *getter) FloatGetter() (func() (float64, error), error) {
 			return 0, err
 		}
 
-		f, err := strconv.ParseFloat(s, 64)
+		f, err := parseFloat(s)
 		if err != nil {
 			return 0, err
 		}
diff --git a/plugin/helper.go b/plugin/helper.go
index 7f7520258..b1048d980 100644
--- a/plugin/helper.go
+++ b/plugin/helper.go
@@ -3,6 +3,8 @@ package plugin
 import (
 	"context"
 	"fmt"
+	"math"
+	"strconv"
 
 	"github.com/evcc-io/evcc/api"
 	"github.com/evcc-io/evcc/util"
@@ -42,3 +44,12 @@ func contextLogger(ctx context.Context, log *util.Logger) *util.Logger {
 
 	return log
 }
+
+// parseFloat rejects NaN and Inf values
+func parseFloat(payload string) (float64, error) {
+	f, err := strconv.ParseFloat(payload, 64)
+	if err == nil && (math.IsNaN(f) || math.IsInf(f, 0)) {
+		return 0, fmt.Errorf("invalid float value: %s", payload)
+	}
+	return f, err
+}