5. System Design
5.1. Lynx distribution system parts
A Lynx distribution system consists of a single Lynx Shunt VE.Can module.
Then, single, multiple or a combination of Lynx Distributor modules and/or Lynx Power In modules are added.
Together they form a continuous negative and positive busbar with DC connections and, depending on the configuration, integrated fuses, a battery monitor and/or lithium battery management.
5.1.1. Interconnecting Lynx modules
Each Lynx module can connect to other Lynx modules on the left side (M8 hole) and on the right side (M8 bolt).
If the Lynx module is the first in line, the last in line or is used by itself, it is possible to connect batteries, loads or chargers directly to these connections. However, we do not generally recommend this beacuse aditional insulation and fusing is needed.
Lynx connections: The arrows indicate where the other Lynx modules can connect
The example below shows a Lynx system consisting out of a Lynx Power In, Lynx Shunt VE.Can and Lynx Distributor. Together they form a continuous busbar, with un-fused battery connections, battery monitor, main system fuse and fused load connections.
Interconnected Lynx modules: Lynx Power In, Lynx Shunt VE.Can and Lynx Distributor
5.1.2. Orientation of Lynx modules
If the Lynx System contains a Lynx Shunt VE.Can, the batteries always have to be connected to the left side of the Lynx System and the rest of the DC system (loads and chargers) connect to the right side. This, so the battery state of charge can be correctly calculated.
Example of Lynx module orientation: the batteries connect to the left side and all loads and chargers connect on the right side
The Lynx modules can be mounted in any orientation. Should they be mounted upside down, so that the text on the front of the units is upside down as well, use the special stickers are included with each Lynx module, so that the text is orientated the correct way.
Example of Lynx modules mounted upside down: the batteries connect to the right side, all loads and chargers connect to the left side and the upside down stickers are affixed.
5.1.3. System example - Lynx Shunt VE.Can, Lynx Power In, Lynx Distributor and lead acid batteries
This system contains the following components:
Lynx Power In with 4 paralleled 12V lead acid batteries.
Identical cable lengths for each battery.
Lynx Shunt VE.Can with main system fuse and battery monitor.
Lynx Distributor with fused connections for inverter/charger(s), loads and chargers. Note that additional modules can be added if more connections are needed.
CCGX (or other GX device) to read out the battery monitor data.
System with Lynx Shunt VE.Can, lead acid batteries, a Lynx Shunt VE.Can and a Lynx Distributor
5.2. System sizing
5.2.1. Current rating Lynx modules
The Lynx Distributor, Lynx Shunt VE.Can and the Lynx Power In are rated for a nominal current of 1000A, for 12, 24 or 48 System voltages.
To give an idea of how much power the Lynx modules are rated at different voltages, see below table. The power rating will give you an indication how big the connected inverter/charger system can be. Keep in mind that if inverters or inverter/chargers are used, both the AC and DC system will be powered from the batteries. Also be aware that a Lynx Smart BMS or a Lynx Ion (now discontinued) can have a lower current rating.
12V | 24V | 48V | |
---|---|---|---|
1000A | 12kW | 24kW | 48kW |
5.2.2. Fusing
The Lynx VE.Can has a space for a main fuse. This space has been designed to fit a CNN fuse. A 325A/80V fuse is available from Victron Energy (CIP140325000-Fuse CNN 325A/80V for Lynx shunt) or use another CNN fuse by Littlefuse. Although the distance between the fuse mounting bolts is designed for a CNN fuse but it might also be possible to fit other fuse types in this space. The fuse mounting bolts are M8 and their centres are 63mm apart.
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CNN fuse dimensions in inches (mm)
Always use fuses with the correct voltage and current rating. Match the fuse rating to the maximum voltages and currents that potentially can occur in the fused circuit. For more information on fuse ratings and fuse current calculations see the Wiring Unlimited book.
Caution
The total value of the fuses of all circuits should not be more than the current rating of the Lynx module, or the Lynx model with the lowest current rating in case of multiple Lynx modules are used.
5.2.3. Cabling
The current rating of the wires or cables used to connect the Lynx Shunt VE.Can to batteries and/or the DC loads, has to be rated for the maximum currents that can occur in the connected circuits. Use cabling with a sufficient core surface area to match the maximum current rating of the circuit.
For more information on cabling and cable thickness calculations see our book, Wiring Unlimited.