diff --git a/charger/delta.go b/charger/delta.go
index 987184a252..4b921fe93e 100644
--- a/charger/delta.go
+++ b/charger/delta.go
@@ -23,6 +23,7 @@ type Delta struct {
 	curr    float64
 	base    uint16
 	enabled bool
+	isBasic bool
 }
 
 const (
@@ -101,6 +102,11 @@ func NewDelta(uri, device, comset string, baudrate int, proto modbus.Protocol, s
 
 	wb.base = connector * 1000
 
+	// check for basic or smart register set
+	if _, err := wb.conn.ReadInputRegisters(wb.base+deltaRegEvseChargerState, 1); err != nil {
+		wb.isBasic = true
+	}
+
 	b, err := wb.conn.ReadHoldingRegisters(deltaRegCommunicationTimeoutEnabled, 1)
 	if err != nil {
 		return nil, fmt.Errorf("failsafe timeout enabled: %w", err)
@@ -153,7 +159,12 @@ func (wb *Delta) Status() (api.ChargeStatus, error) {
 	switch s := encoding.Uint16(b); s {
 	case 0, 1, 2:
 		return api.StatusA, nil
-	case 3, 5, 6, 7, 9:
+	case 3:
+		if wb.isBasic {
+			return api.StatusA, nil
+		}
+		return api.StatusB, nil
+	case 5, 6, 7, 9:
 		return api.StatusB, nil
 	case 4:
 		return api.StatusC, nil
@@ -162,6 +173,27 @@ func (wb *Delta) Status() (api.ChargeStatus, error) {
 	}
 }
 
+var _ api.StatusReasoner = (*Delta)(nil)
+
+// statusReason implements the api.StatusReasoner interface
+func (wb *Delta) StatusReason() (api.Reason, error) {
+	if !wb.isBasic {
+		b, err := wb.conn.ReadInputRegisters(wb.base+deltaRegEvseState, 1)
+		if err != nil {
+			return api.ReasonUnknown, err
+		}
+
+		switch s := encoding.Uint16(b); s {
+		case 3:
+			return api.ReasonWaitingForAuthorization, nil
+		case 5:
+			return api.ReasonDisconnectRequired, nil
+		}
+	}
+
+	return api.ReasonUnknown, nil
+}
+
 // Enabled implements the api.Charger interface
 func (wb *Delta) Enabled() (bool, error) {
 	b, err := wb.conn.ReadHoldingRegisters(wb.base+deltaRegEvseChargingPowerLimit, 2)