Query about integrating Epever batteries with Victron Energy system for monitoring and efficiency

DIY
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Hello,

I am in the process of setting up a solar energy storage system and would like to gather feedback from other professionals about a configuration I am considering.

The setup:

  • Batteries: Epever 25.6V 150Ah, 3 units (total 51.2V 450Ah).
  • Monitoring System: I plan to use a Victron SmartShunt and a Cerbo GX to monitor the system.
  • Temperature Monitoring: I will also add a Victron SmartShunt Temperature Sensor.
  • Communication: The Epever batteries have Bluetooth communication, but no direct integration with Victron’s system.

Configuration Details:

  1. Cerbo GX Setup: I plan to configure the battery parameters manually on the Cerbo GX, including voltage (51.2V) and capacity (450Ah).
  2. SmartShunt and Temperature Sensor: I will use the Victron SmartShunt to monitor battery usage and energy flow, and the SmartShunt Temperature Sensor to track ambient temperature.
  3. BMS: The batteries have their own BMS (Battery Management System) for internal monitoring, but I intend to use the Victron system primarily for external monitoring.

My concerns:

  • Efficiency and Accuracy: Given that the Epever batteries are monitored by their own BMS (via Bluetooth), how will this affect the accuracy of the data shown by the Victron system (particularly State of Charge - SoC and battery health)?
  • System Integration: Since the Epever BMS and Victron devices don’t communicate directly, I’m wondering if this setup will lead to any efficiency loss or inaccuracies in monitoring, particularly regarding battery balancing, voltage, and temperature.
  • Monitoring Precision: Will the Victron SmartShunt with temperature sensor provide a reliable and precise reading of the battery’s state, or will the absence of full integration with the Epever BMS lead to discrepancies?

I’m interested to hear your thoughts on whether this configuration will provide a reliable, efficient system, and if you have any suggestions for improving the monitoring and performance.

Thank you!

2

Efficiency and accuracy
The SmartShunt SOC will be accurate but you will have to set it up correctly to synchronise to 100% when the batteries are full. It does not display SOH.

System integration
The problem here is that because the batteries do not communicate is if the cells are out of balance the batteries can not communicate the need for a lower charge current. Often the BMS needs to keep turning charging on and off which takes longer to balance. With new batteries you get around this by setting the charge current a little lower until they are balanced.

Precision.
The 2 systems will always be different, bit as long as you get regular charges to full to synchronise the SOC to 100% then you should be OK and have set up the SmartShunt OK. The temperatures of cells inside the battery and the external temperature will always be a few degC different.

1 Like
3

51.2 v with 3 25.6v batteries won’t work.

Either 2 or 4.

4

25.6V 150Ah, 3 units (total 51.2V 450Ah)

Hope there is a typo… correct will be 25.6V, 450Ah