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What is the modbus address to reset the Max. kVA reading PM850 via. modbus communication.

You may try the register commands as listed below to reset power min/max demand (including peak demand): 
Write a value 9020 to register 8000, this will enter setup, 
Write a value 5213 to register 8000 to reset power min/max demand, 
Write a value 1 to register 8001 to save the change, 
Write a value 9021 to register 8000 to exit the setup mode. 
The peak demand date and time should log next peak demand power available.
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