Parallel redundant lithium battery systems with the Lynx Smart BMS

The new ability to have parallel Lynx Lithium battery systems was introduced in July 2024 with the release of Venus OS v3.40.  This feature adds redundancy, increases maximum installable capacity, and allows higher charge and discharge currents.  It applies to all systems using the Lynx BMS, including the original versions and the NG (New Generation) versions.

The feature allows redundancy for mission critical installations by permitting one part of the battery system to continue even if another part has shut down.  The system will remain online for as long as possible while preserving safety and battery life.  The Cerbo GX or other GX device keeps tabs on all the systems, showing the individual banks as well as the system as a whole.  This feature requires Lynx Smart BMS firmware version v1.11 in combination with Venus OS v3.40.

This feature has just been announced and detailed instructions had not yet been provided, but at PKYS we went ahead and tried this anyway and here is what we saw.

   

 

 

Each Cerbo shows its own BMS as well as the other one.  We just linked the two as part of the VE Can connection so the network goes from BMS Station 4 to Cerbo Station 4 to Cerbo Station 2 to BMS Station 2 with an end terminator at each end of the network.  The two systems are completely separate and the only link between the two at the moment is the VE Can connection.  Currently we dont even have a ground connection between the two system.  I guess I need to fix that before I go any further so that we dont blow up the VE Can connection.

Since we tried it the detailed instructions have been included in the Lynx BMS NG manual   Below is a sample wiring diagram of a parallel system.  the instruction manual goes into all the details.