Lynx Smart BMS 8.5. Frequently Asked Questions (FAQ) This section answers common questions and concerns to help you better understand and use the parallel BMS feature. If you're troubleshooting a problem, need clarification on features, or are looking for tips to optimise your experience, you'll find some helpful answers here. If your question isn't answered, please refer to the detailed sections of this manual. Q: What happens when I have two banks, the first fully charged and the second empty, and I enable both BMSes simultaneously? A: Both BMSes will start pre-charging. The empty one will complete pre-charging first and then connect.
The second BMS will go into pending mode and wait for the voltage difference to be within limits; in other words, it waits for the first bank to be charged to a similar voltage. Q: What happens when I have one bank fully charged and online and then enable the second bank, which is empty? A: The second bank will go into standby mode and wait for the voltage difference to be within limits, i.e., for the online bank(s) to discharge to a low enough voltage. Q: What happens the other way around, with an empty bank online and a full bank added? A: The full bank will go into pending mode until the voltage limit is within the limit, i.e., until the empty bank is charged. Q:
What happens if there is a communication loss between BMSes? A: It depends on where the connection is interrupted in the chain of BMSes. Let's imagine a system with two battery banks, as shown in the image below: Q: What happens if an error occurs in one of the battery banks? A: See the table above. Q: What happens if a power supply fails in one of the BMSes? A: See the table above. Page 30 Paralleling Lynx BMSes Event Behaviour Cable A is disconnected or broken BMS 1:BMS issues a warning that the CAN connection is lost and continues to operate as a standalone BMS BMS 2: Continues to operate as a standalone BMS while maintaining communication incl. DVCC with the GX device Virtual BMS:
Remains present on the GX device and indicates that only one of the two BMSes is connected BMS 1: Continues to operate in parallel while communication with the GX device is BMS 1 BMS 2 Cable B is disconnected or broken interrupted BMS 2: Continues to operate in parallel while communication with the GX device is interrupted For both BMSes: DVCC is not functioning because neither BMS can communicate with the GX device. Therefore, the charging algorithm defined in the charger(s) is now in effect Virtual BMS: Disappears from the device list Cable A Cable B Error in battery bank 1 or 2 BMSes:
The BMS will turn off the defective battery bank while the other BMSes continue to operate as standalone BMSes DVCC parameters (CCL, CVL and DCL) are based on the battery to BMS that is still active Power supply failure in one BMS BMSes: The defective BMS will turn off while the other BMSes continue to operate as standalone BMSes DVCC parameters (CCL, CVL and DCL) are based on the battery to BMS that is still active