Posted by Peter Kennedy on 2/7/2023 to Batteries (Lithium Ion)
The Lynx Smart BMS is a dedicated Battery Management System for Victron Lithium Smart Batteries. There are multiple BMS's available for Victron Smart Lithium Batteries, and the Lynx Smart is the most feature rich and complete option. Its main features are:
- Built-in 500A contactor used as a fallback safety mechanism and also suitable as a remote controllable main system switch.
- Battery monitor, indicating state of charge percentage and more data.
- Pre-alarm signal: provide a warning before the system shuts down due to -for example- a low cell.
- Bluetooth for use with the VictronConnect App, for setup and monitoring.
- Local and remote monitoring using the Cerbo GX.
- The Lynx Smart BMS is part of the modular Lynx Distribution system.
The instruction manual is the most complete guide to wiring up the Lynx BMS. I made the following video to explain everything in an easy to understand way but if you see any discrepancies the manual takes precedence. Further down you will see a summary of the text from the video along with some additional notes, a copy of the wiring diagram and some additional information.
Here are some notes about the cables discussed in the video:
- Battery Data Cables. You will probably need some extension cables to enable them to reach the BMS. These come in packs of two with lengths of 1, 2, 3 and 5 meters. Here is the 2 meter one: Victron Energy ASS030560200 M8 circular connector Male/Female 3 pole cable 2m (bag of 2)
- VE Can Network. This uses RJ45 cables. The network terminators are included with any device that uses them, your Lynx BMS should have come with a pair, so did your Cerbo GX. If you have lost them we sell them here.
- RJ10 cables come with the Lynx Distributor. If you have multiple Lynx Distributors the can daisy chain them. If you want to space the Lynx Distributors further apart and need longer RJ10 cables you should be able to find some online, we don't have any for sale, sorry.
- The big red battery switch shown in the video is the Blue Sea 6006. The small toggle switch I used in my demo is the Blue Sea 4150
- The fuse block I used in the video is the Blue Sea 5045. I used Blue Sea 5235 ATO/ATC 1 amp fuses. Note that these fuses are not suitable for use in a 48 volt system. In fact I was unable to source any suitable fuses for a 48 volt system. In all the 48 volt systems we have been involved with there was a 12 or 24 volt battery available to power all these small connections. As long as both battery systems share the same negative it is OK to power or control these small items from a different voltage.
- The negative terminal block I used was the Blue Sea 2314 mini busbar.
- The alarm I used was the Blue Sea 1070
- The BatteryProtect was the Victron Energy BPR110022000 Smart BatteryProtect with Bluetooth 12/24V-100A
There is an alternate way to wire the control wire to the Smart BatteryProtect. It doesn't require any power or a fuse block and it is discussed in the instruction manual. I chose to do mine the way I did because there might be multiple things I want to control and my way works for every situation whereas the alternative method only works in certain situations. In any case I am going to need fuses for the Cerbo GX and the alarm so one or two more is not a hardship, the four gang fuse block is the smallest I could find.
Here is a detailed photo of the terminal area:
And finally, here is the wiring diagram I used in the Video, you can right click on the image and open it in a new tab to see a larger version: