Electrical Connection
PWS2-30K-EX electrical wiring should strictly following the following requirements. Please read the following carefully.
DANGER
Before electrical connection, please ensure that all switches of energy storage system are in “OFF” . Otherwise, the high voltage of the inverter might cause an electric shock risk.
WARNING
Incorrect wiring operation might cause operator casualties or permanent equipment damage.
Only qualified professional can conduct wiring work.
Before electrical connection, remember that the inverter has 2 supplies. Electrical operator should wear protective devices such as helmet, insulated shoes and protective gloves.
CAUTION
The cable colors mentioned in all electrical connection diagrams in this chapter are for reference only. Cable selection should comply with local cable standard.
Introduction to port of PCS
| No. | Description |
|---|---|
| 1 | DC + to connect battery’s positive pole. It is recommended to use M8*12 screws |
| 2 | DC - to connect battery’s negative pole. It is recommended to use M8*12 screws |
| 3 | DC protection shell fixing point |
| 4 | RS-485, R-in+, R-in-, R-out+, R-out- |
| 5 | Ethernet port |
| 6 | AC protection shell fixing point |
| 7 | AC terminal block, M6 crimp terminal are recommended |
| 8 | Ground protection block, M4 crimping terminals are recommended |
Preparation tools: Torque wrench Screwdriver Wire stripper Terminal crimping machine Multimeter Hot air blower Heat Shrink Tubing
system grounding
Connect the inverter to the grounding bar through the protective grounding wire to protect grounding protection. Specifications of cable and terminal: Grounding wire: the recommended cross sectional area=6mm2 (10AWG) outdoor copper core cable Ring terminal: M4
CAUTION
Good grounding can resist the surge voltage surge and improve EMI performance. Before connection of AC, DC and communication cables, the grounding wire should be connected first.
It is recommended that the inverter should be grounded locally. For multiple PWS2-30M-EX parallel connection system, the grounding points of all inverters should be connected with each other so as to ensure equal potential connection of grounding wires.
Step 1: Use a wire stripper to strip the insulating layer of the grounding wire in a proper length;
Step 2: Penetrate the wire core whose insulating layer is stripped into the conductor crimping area of ring terminal. Press the ring terminal with a hydraulic clamp.
Step 3: Cover the terminal on the grounding bolt and screw up the nut.
DC wiring
Specifications of cable and terminal:
Grounding wire: the recommended cross-sectional area=25mm2 (3AWG) outdoor copper core cable
Ring terminal: M8
Step 1: Use a multi-meter to measure the voltage of battery and ensure that the voltage is within input voltage range of energy storage inverter.
Step 2: Turn off the DC breaker. Wiring operation can be conducted after using a multi-meter to measure and confirm that there is no voltage between positive and negative poles of DC input.
Step 3: Use a wire stripper to strip the DC cable in a proper length, cover a cord end terminal and use wire crimpers to compress it. Recommended DC cable 25mm2 (AWG 3) with copper cord.
Step 4: Connect the positive cable of the battery pack to the “DC+” of the DC terminal block so that the angle between the cable and the terminal block is 90 degrees.
Step 5: Connect the negative cable of the battery pack to the “DC-” of the DC terminal block so that the angle between the cable and the terminal block is 90 degrees.
Step 6: Confirm wiring firmness and lock of DC cable.
Remark: The angle of 90 degrees between the cable and the terminal is for convenient installation of the DC side protective case.
DANGER
Turn off AC and DC distribution switches and ensure that there is no dangerous voltage in the system during wiring.
WARNING
The positive and negative poles of batteries cannot be connected inversely. Before wiring, a multi-meter needs to be used for measurement.
CAUTION
Only qualified professional can conduct wiring work.
AC wiring
Step 1: Use a phase-sequence meter for measurement, and ensure that the phase consequence of wires should be correct.
Step 2: Turn off the AC breaker connected to energy storage inverter.
Step 3: Use a multi-meter to measure and confirm that the cables connected to the terminals are electrically neutral.
Step 4: Use a wire stripper to strip the AC cable in a proper length, cover a cord end terminal and use wire crimpers to compress it. Recommended AC cable 16mm2 (AWG 5) with copper cord.
Step 5: Connect AC cable to “L1”, “L2”, “L3” and “N” of AC wire terminal block;
Step 6: Confirm wiring firmness and lock the waterproof tube of AC cable.
WARNING
Ensure that there is no dangerous voltage at connection points during wiring.
WARNING
Only qualified professional can conduct wiring work.