Lynx Smart BMS NG Manual

This paragraph explains how to attach several Lynx modules to each other and how to mount the Lynx assembly into its final location. These are the points to take into consideration when interconnecting and mounting Lynx modules:

If Lynx modules are going to be connected to the right and if the Lynx module is fitted with a plastic barrier on the right side, remove the black plastic barrier. If the Lynx module is located as the most right module, leave the black plastic barrier in place. If Lynx modules are going to be connected to the left, remove the red and black rubber sleeves. If the Lynx module is located as the most left module, leave the red and black rubber sleeves in place. Remember that for a Lynx Smart BMS NG, the left side is the battery side, and the right side is the DC system side. Connect all Lynx modules to each other using the M10 holes and bolts on the left and right. Ensure that the modules slot into the rubber joiner recesses correctly. Place the washer, spring washer and nut on the bolts in the correct order and tighten the bolts using a torque of: Mount the Lynx assembly in its final location using the 5mm mounting holes.

For all DC connections, the following applies:

All cables and wires connected directly to the Lynx Smart BMS NG must be fitted with M10 cable lugs. When attaching the cable to the bolt, pay attention to the correct placement and order of the cable lug, washer, spring washer, and nut on each bolt. Tighten the nuts using a torque of 33 Nm.

These instructions only apply if the system contains Lynx Distributor(s).

Each Lynx module has two RJ10 connectors, one on the left and one on the right. See the drawing below.

Locations of the RJ10 connectors and RJ10 cable recesses on the Lynx Distributor, Lynx Smart BMS NG and the Lynx Shunt VE.Can

To connect the RJ10 cables between the Lynx Smart BMS NG and Lynx Distributor, do the following:

Connection example Lynx Smart BMS NG system - RJ10 cables indicated in yellow

Connect the BMS cables from the lithium battery to the BMS connectors on the Lynx Smart BMS NG.

Location of the BMS cable connectors

If multiple batteries (up to 50 batteries can be connected to the BMS) are used, first interconnect the battery BMS cables and then connect the BMS cable from the first and last battery to the BMS connectors on the Lynx Smart BMS NG.

If the BMS cables are too short, use BMS extension cables.

Lynx Smart BMS NG battery BMS cable connection examples

The multi-connector is the green connector on the bottom of the Lynx Smart BMS NG. The connector of the Lynx Smart BMS NG has 13 pins, numbered from left to right, starting with pin 1 and ending with pin 13. Pin 12 and 13 are reserved for future functionality. Do not connect anything to them.

See the Appendix for a table with pin-out and description.Multiconnector pin-out and overview

The multi-connector can be pulled out of the Lynx Smart BMS NG, allowing for easy wiring.

The Remote on/off (pin 10 and 11) of the terminal are interconnected with a wire loop by default. If the Remote on/off connection is used with a simple on/off switch, remove the loop and wire as desired.

Multi-connector location

The ATC (allow-to-charge) and ATD (allow-to-discharge) are potential-free dry contacts of the multi-connector that can control chargers and loads in the system, provided they have a remote on/off connector and are wired appropriately. They can be used in several ways.

A common example is by providing +12V wired from AUX + (equal to system voltage) to pin 3 and pin 5. An active high signal is then delivered to the connected remote H ports of the chargers and loads via pin 4 respectively pin 6. In case of a low cell voltage, ATD opens the contact between pin 5 and pin 6. The load is then switched off and further discharge is prevented. If the temperature is too low to charge, the ATC contact between pin 3 and pin 4 opens and switches off the chargers.

Instead of using system voltage on AUX +, system negative can be used on AUX - to generate an active L signal. The functionality is the same as described above, except that the low signal ensures that the loads and chargers are switched off. This active L signal can then be connected to the remote L terminals of a charger or load. In contrast to the H signal, system negative is also present if the contactor opens and the Lynx Smart BMS NG goes into OFF mode.

Another option is to use the ATC and ATD contacts as remote switches, for example, to control a Smart BatteryProtect to turn off loads in the event of low cell voltage or a charger in the event of low temperature.

See the wiring examples below:

Instead of the pre-installed wire loop between pin 10 and pin 11, a simple on/off switch can be wired to remotely turn the Lynx Smart BMS NG on and off. Alternatively, terminal H (pin 10) can be switched high (typically battery positive), or terminal L (pin 11) can be switched low (typically battery negative) to remotely control the Lynx Smart BMS NG.

The required and maximum voltage levels for remote switching via the H or L pin are listed in the following table:

See the below example for the correct wiring:

Simple remote on/off switch wired between pin 10 and pin 11, or battery positive (or negative) and pin 10 (or pin 11). Pin 12 and 13 are not shown.

The programmable relay is an SPDT relay (Single Pole, Double Throw) with 3 contacts:

Common (COM) Normally Open (NO) Normally Closed (NC) The relay makes contact between COM and NC when the relay is not active, while COM and NO make contact when the relay is activated.

Depending on the Relay mode setting (Alarm relay or Alternator ATC) in the VictronConnect app, an audible (buzzer or external speaker) or visible device (LED signal) or the signal line (usually the ignition wire) for the ATC signal of an external alternator regulator can be connected.

Connect the VE.Can port of the Lynx Smart BMS to the VE.Can port of the GX device using an RJ45 cable.

Multiple VE.Can devices can be daisy chained, but ensure the first and the last VE.Can device both have a VE.Can RJ45 terminator installed.

Power the GX device from the AUX + and AUX – terminals of the Lynx Smart BMS NG.

Location of the VE.Can connectors on the Lynx Smart BMS NG

Wiring example Lynx Smart BMS NG and a Cerbo GX with GX Touch

The heart of this system is a Lynx Smart BMS NG with two Lynx distributors and a Cerbo GX with a GX Touch panel. These devices continuously monitor the batteries, fuses, connected loads, chargers, and inverter/charger(s).

A typical system can contain the following components:

System with Lithium NG batteries, Lynx Smart BMS NG and two Lynx Distributors

The same as before, but this time with a single Lynx Distributor on the load side of the Lynx Smart BMS NG and the Lithium NG battery connected directly to the input of the BMS. This is useful if only a single Lithium NG battery or a single series string of Lithium NG batteries is used. Otherwise the same components are used.

System with a Lynx Smart BMS NG and a single Lynx Distributor

For a very slim-line system, the Lynx Smart BMS NG can be used alone. This is useful if the system contains a single lithium battery or a single series string of lithium batteries together with a simple DC system.

Please also note that no GX device is used. It is not absolutely necessary for the operation of the Lynx Smart BMS NG. However, without a GX device it is impossible to control compatible inverter/chargers and MPPTs via DVCC.

System with a Lynx Smart BMS NG, without other Lynx modules and GX device.