Battery voltage measurement mismatch

The inverter flags this when the battery voltage it measures itself differs too much from the voltage reported by the battery management system (BMS). On SMA SB3600SE-10 and SB5000SE-10 inverters it appears as event 9306, a failed plausibility check. First, measure the battery voltage directly with a meter and compare it with the value shown through communication. If the two values differ by more than 1.5%, the inverter's voltage measurement is faulty and the inverter should be replaced. If they differ by less than 1.5%, the battery is the likely cause and should be replaced. Before contacting SMA Service, note the inverter type and serial number, the event number, the battery pack serial number, how long the error has lasted, whether it is sporadic or continuous, and any other error messages. For battery error messages in general, check that the message is plausible before you replace the battery.

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• sentence 3: support check: partial - Passage says to measure battery voltage and compare with the displayed communicated value, but does not say 'directly with a meter'; this is a minor detail. -->