4. System Design considerations and examples
4.1. Integration into the Lynx Distributor System
The Lynx Smart BMS integrates seamlessly with the Lynx Distributor system, which is not mandatory for operation, but highly recommended due to its ease of installation.
It is important to note that the battery must always be connected to the left side of the Lynx Smart BMS (in normal position), while all loads and chargers are connected to the right side.
The example below shows the Lynx Smart BMS in a system with two Lynx Distributors. Together they form a continuous busbar with fused battery connections, battery monitor, BMS system, contactor and fused load connections.
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.
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Lynx Smart BMS with two Lynx Distributors
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Example of Lynx module orientation: the batteries connect to the left and all loads and chargers connect on the right side
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Example of Lynx modules mounted upside down: now the batteries connect to the right side, all loads and chargers connect to the left side and the upside down stickers (included) are affixed.
Caution
It is important to note that the battery is always connected to the left side of the Lynx Smart BMS (in normal position), while all loads and chargers go to the right side.
4.2. System sizing
4.2.1. Current rating Lynx Smart BMS
The main safety contactor of the Lynx Smart BMS has a continuous current rating of 500A (1000A for the M10 model) and a peak current rating of 600A (1200A for the M10 model)) for a duration of 5 minutes. Even if the Lynx Smart BMS has an overcurrent protection, make sure that the current rating is not exceeded.
The following happens in the event that the peak current limit or the 5 minute interval has been exceeded:
an overcurrent alarm will be generated
ATC or ATD (depending on current direction) is disabled after a 30s delay
The table below gives an idea of how much power a Lynx Smart BMS is rated for at different voltages. This 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 the DC system will be powered from the batteries.
Voltage vs. Current | 12V | 24V | 48V |
|---|---|---|---|
500A | 6kW | 12kW | 24kW |
1000A | 12kW | 24kW | 48kW |
4.2.2. Fusing
The Lynx Smart BMS is not a system fuse. It only warns when the current is too high. Fusing needs to be done externally, for example by connecting Lynx Distributor modules to the Lynx Smart BMS or by using external fuse holders and fuses.
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.
4.2.3. Cabling
The current rating of the wires or cables used to connect the Lynx Smart BMS 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.