2. System Design considerations and examples
2.1. Integration into the Lynx Distributor System
The Lynx Smart BMS NG 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 NG (in normal position), while all loads and chargers are connected to the right side.
The example below shows the Lynx Smart BMS NG 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. If they are mounted upside down, the text on the front of the units will be upside down as well. To ensure that the text is orientated correctly, use the special stickers included with each Lynx module.
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Lynx Smart BMS NG 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 NG (in normal position), while all loads and chargers go to the right side.
2.2. System sizing
2.2.1. Current rating Lynx Smart BMS NG
The main safety contactor of the Lynx Smart BMS NG has a continuous current rating of 500A or 1000A, depending on the model, and a peak current rating of 600A or 1200A for a duration of 5 minutes. Even if the Lynx Smart BMS NG has an overcurrent protection, ensure the current rating is not exceeded.
The following happens if 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 shows how much power a Lynx Smart BMS NG is rated for at different voltages. This will indicate how big the connected inverter/charger system can be. Remember that if inverters or inverter/chargers are used, the AC and DC systems will be powered by the batteries.
Voltage vs. Current | 12V | 24V | 48V |
|---|---|---|---|
500A | 6kW | 12kW | 24kW |
1000A | 12kW | 24kW | 48kW |
2.2.2. Fusing
The Lynx Smart BMS NG 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 NG 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 can potentially 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 if multiple Lynx modules are used.
2.2.3. Cabling
The current rating of the wires or cables used to connect the Lynx Smart BMS NG 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.