diff --git a/charger/wattpilot.go b/charger/wattpilot.go
index 717ad7c9b..a276a1e8f 100644
--- a/charger/wattpilot.go
+++ b/charger/wattpilot.go
@@ -132,3 +132,14 @@ var _ api.Identifier = (*Wattpilot)(nil)
 func (c *Wattpilot) Identify() (string, error) {
 	return c.api.GetRFID()
 }
+
+var _ api.PhaseSwitcher = (*Wattpilot)(nil)
+
+// Phases1p3p implements the api.PhaseSwitcher interface
+func (c *Wattpilot) Phases1p3p(phases int) error {
+	if phases == 3 {
+		phases = 2
+	}
+
+	return c.api.SetProperty("psm", phases)
+}