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Fix Sungrow iHM Counter values #3350

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Merged
benderl merged 2 commits into from
May 7, 2026
Merged

Fix Sungrow iHM Counter values #3350

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3ca5053
Fix power sign and update voltage calculation
seaspotter May 6, 2026
45f0280
explain voltage calculation
benderl May 7, 2026
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10 changes: 7 additions & 3 deletions packages/modules/devices/sungrow/sungrow_ihm/counter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@ def initialize(self) -> None:
def update(self):
unit = self.device_config.configuration.modbus_id
power = self.__tcp_client.read_input_registers(8156, ModbusDataType.INT_32,
wordorder=Endian.Little, unit=unit) * -10
wordorder=Endian.Little, unit=unit) * 10

powers = self.__tcp_client.read_input_registers(8558, [ModbusDataType.UINT_32] * 3,
wordorder=Endian.Little, unit=unit)
Expand All @@ -43,8 +43,12 @@ def update(self):

voltages = self.__tcp_client.read_input_registers(8554, [ModbusDataType.UINT_16] * 3,
wordorder=Endian.Little, unit=unit)

voltages = [value / 10 for value in voltages]
# Die Register liefern nur Spannung Phase zu Phase und nicht Phase zu N, daher durch Wurzel 3.
# Dies setzt voraus, dass die Phasen symmetrisch belastet sind, was in der Praxis nicht
# der Fall sein muss, es ist jedoch eine gute Näherung.
# Bei einer erlaubten Schieflast von 20A (allgemeine Vorgabe in Deutschland) könnte die Spannung
# auf einer Phase um 5 bis zu 20% höher sein als auf den anderen Phasen.
voltages = [value / 10 / (3 ** 0.5) for value in voltages]

self.peak_filter.check_values(power)
imported, exported = self.sim_counter.sim_count(power)
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