diff --git a/sma/speedwireinverter.cpp b/sma/speedwireinverter.cpp
index 24c90b06..ef3fc805 100644
--- a/sma/speedwireinverter.cpp
+++ b/sma/speedwireinverter.cpp
@@ -739,7 +739,7 @@ void SpeedwireInverter::processAcTotalPowerResponse(const QByteArray &response)
         if (measurementId == 0x263f00 && measurmentNumber == 0x01) {
             quint32 totalAcPower;
             stream >> totalAcPower;
-            m_totalAcPower = readValue(totalAcPower, 1000.0);
+            m_totalAcPower = readValue(totalAcPower);
             qCDebug(dcSma()) << "Inverter: Total AC power" << m_totalAcPower << "W";
             readUntilEndOfMeasurement(stream);
         }
@@ -788,13 +788,13 @@ void SpeedwireInverter::processDcPowerResponse(const QByteArray &response)
         if (measurementId == 0x251e00 && measurmentNumber == 0x01) {
             quint32 powerMpp1;
             stream >> powerMpp1;
-            m_powerDcMpp1 = readValue(powerMpp1, 1000.0);
+            m_powerDcMpp1 = readValue(powerMpp1);
             qCDebug(dcSma()) << "Inverter: DC power MPP1" << m_powerDcMpp1 << "W";
             readUntilEndOfMeasurement(stream);
         } else if (measurementId == 0x251e00 && measurmentNumber == 0x02) {
             quint32 powerMpp2;
             stream >> powerMpp2;
-            m_powerDcMpp2 = readValue(powerMpp2, 1000.0);
+            m_powerDcMpp2 = readValue(powerMpp2);
             qCDebug(dcSma()) << "Inverter: DC power MPP2" << m_powerDcMpp2 << "W";
             readUntilEndOfMeasurement(stream);
         }
diff --git a/sma/speedwireinverter.h b/sma/speedwireinverter.h
index 518baf07..8750202b 100644
--- a/sma/speedwireinverter.h
+++ b/sma/speedwireinverter.h
@@ -184,7 +184,7 @@ private:
     void processInverterStatusResponse(const QByteArray &response);
 
     void readUntilEndOfMeasurement(QDataStream &stream);
-    double readValue(quint32 value, double divisor);
+    double readValue(quint32 value, double divisor = 1.0);
 
     void setReachable(bool reachable);