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My charging session shows a negative value — how is that possible?

In rare occasions a transaction has a negative value. This is often due to wrong communication from the charging station. This article is for installers. If you are a user please contact your installer. Negative transactions are not reimbursed.

Check the logs of the transactions

When diagnosing negative transactions, the sequence of status notification log entries is important. Determine what logs the charging station is sending to the Maxem Energy Cloud. 
The key is to observe the order of StartTransaction and StopTransaction logs. Open these transaction logs around the timestamp of when the error occurred. After that contact the manufacturer of the charging station and discuss your findings.
 

Steps to determine the cause:

  1. Go to the logs of the charging station.
  2. Filter the status notifications and also select the StartTransaction and StopTransaction notifications. 



3. Look around the time when the issue occurred. 

4. Check the order of the Start Transaction and Stop Transactions.

5. Each StartTransaction and StopTransaction should be in a pair with the same TransactionID to create a full transaction. 

 

 


 

6. Open the StopTransaction of the faulted transactions. Check the meter values: Check the ‘value’ of the “Transaction.Begin and Transaction.End”. The value of “Transaction.End” should always be higher than the value of Transaction.Begin.

 

 


Example image of correct values with the "Transaction.Begin" value being lower than the "Transaction.End"

 

7. If the Start Transaction and Stop Transaction values are not reversed check the Status notifications in between the Start Transaction and Stop Transaction and check for errors.

8. Contact the manufacturer of the charging station and discuss the found information.