DYNESS T7 Tower Parallel Scheme

Important information:

1. Only qualified professional electricians can carry out the parallel connection of the Tower series and all other related work.
2. This solution is a brief description of Tower parallel connection, and cannot replace the original user manual.
3. The total voltage difference between clusters should be less than 10V; the SOC of each cluster should be 100%, and the time interval between new clusters and existing clusters should be less than 6 months.
4. Up to 5 Towers are allowed to be connected in parallel.

Parallel scheme introduction
In order to meet the market demand, Dyness has developed the parallel machine function of the Tower series. This parallel solution is applicable to all Tower models.

Main equipment requirements

Parallel connection
The overall configuration diagram of the Tower parallel system is as follows:

The wiring diagram between the Tower and the combiner box is as follows:

Connection diagram between Tower and Combiner Box

Power line connection of the battery terminal of the combiner box

1. Crimp one end of the BDU standard 6mm2 power harness to the Phoenix waterproof connector terminal, and connect it to the socket of the BDU-1.5G:
2. Strip the other end of the 6mm2 power cable as shown in the figure below:
3. Crimp the stripped 6mm2 wire harness to the tube terminal:
4. Connect the 6mm2 power harness with crimped tubular terminals to the B+ and B- ports of the combiner box according to the following steps: Repeat the above operation for the negative cable
5. The schematic diagram of the connection of the power line at the battery end of the combiner box is shown below:

Connecting the communication cable at the battery end of the combiner box

Use standard communication network cables to connect the 4 clusters of Tower BDU-1.5G to the 1#, 2#, 3#, 4#, 5# interfaces of the combiner box respectively. Be careful not to connect to other ports.

Connect the AC power cord or 24V power supply to the combiner box

1. Connect the AC power cord to the combiner box
2. Connect the 24V power supply to the combiner box

Only one of the AC power supply and 24V power supply can be used, and the simultaneous use of both is prohibited.

Connection between combiner box and inverter

1. The communication cable is connected to the communication terminal of the inverter through the “Inverter CAN/RS485” interface of the combiner box. The communication method depends on the inverter side (CAN or 485).Connected, can be used directly.
   
2. The style of the output power harness of the combiner box should be determined by the battery port of the inverter .Cables with an area of ≤ 6mm2 can be crimped onto the terminal block; For cables larger than 6mm2, without considering waterproofing, the waterproof plug of the gland can be removed, and the power line can be connected to the copper busbar through a crimped OT terminal.

Appendix

1. When Towers are connected in parallel, it is necessary to turn the DIP in the newly added Tower BDU to the OFF state, see the table below for details:
2. Set DIP switches (BDU-1.5G) for 3, 4, or 5 towers. The last cluster needs to set DIP switches to 120 (set 60 to OFF and 120 to ON), while the middle clusters do not need to be set (turn them all off). For detailed information, please refer to the table below:

Parallel System Start-up and Shutdown Sequence

Start-up Sequence：
After the above power wiring harness and communication wiring harness are connected and inspected, push the left air switch of all cluster BDUs to the ON position, and push the DC Breaker in the combiner box from OFF to the ON position; First turn the knob switch of cluster 1 BDU to the ON position, and press and hold the WAKE button for 8~9s to let go; then perform the same operation on the BDUs of cluster 2, cluster 3, cluster 4 and cluster 5. After all cluster BDUs are powered on, the combiner box After 10 seconds, all cluster BDUs will close the relays and output voltage externally.

Shutdown Sequence：
First disconnect the AC power of the combiner box, and after about 7-8s, the BDU cuts off the output voltage; then turn the BDU knob switches of cluster 1, cluster 2, cluster 3, cluster 4 and cluster 5 to the OFF position.
If the battery is not used for a long time, you need to turn the switch on the left side of the BDU to the OFF position.

Inverter Compatibility List
See Dyness Compatibility List. Please contact Dyness for details if required.

Attention

1. The protection level of DCB-TW is IP65.
2. Towers connected in parallel must have the same model and capacity.
3. The time interval between the newly added modules of Tower expansion and the existing modules cannot exceed 6 months. During capacity expansion, ensure that the SOC of each module is 100%.

Dyness Digital Energy Technology Co., LTD.
www.dyness-tech.com
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Frequently Asked Questions

• FAQ 1: Can I use both AC power supply and 24V power supply simultaneously?
  No, only one of the AC power supply or 24V power supply can be used at a time. Simultaneous use of both is prohibited.

Documents / Resources

DYNESS T7 Tower Parallel Scheme [pdf] User Guide T7, T10, T14, T17, T21, T7 Tower Parallel Scheme, T7, Tower Parallel Scheme, Parallel Scheme, Scheme

References

• User Manual