Preparing Cables

A

PV string

• PV strings consist of PV modules in series.
• A solar inverter supports 20 PV string inputs.

Prepared by the customer

B

SmartLogger

The solar inverter communicates with the management system through the SmartLogger.

Purchased from Huawei

C

Power Meter

Implements power control at the grid-tied point in low voltage scenarios using a power meter.

Prepared by the customer

D

Support tracking system

Adjusts the angle of the supports.

Prepared by the customer

E

Fuse/Circuit breaker

The tracking system should be equipped with an overcurrent protection device or component. The power cable between the device or component and the wiring terminal should be no longer than 2.5 m.

Therefore, a fuse or a circuit breaker is recommended.

• Installed between the solar inverter and tracking control box
• Fuse specifications: rated voltage ≥ 500 V; rated current: 16 A; protection: gG
• Circuit breaker specifications: rated voltage ≥ 500 V; rated current: 16 A; tripping: C

Prepared by the customer

F

AC switch

To ensure that the inverter can be safely disconnected from the power grid when an exception occurs, connect an AC switch to the AC side of the inverter. Select an appropriate AC switch in accordance with local industry standards and regulations. Huawei recommends the following switch specifications:

• Installed in the AC combiner box
• Recommended: a three-phase AC circuit breaker with a rated voltage greater than or equal to 500 V AC and a rated current of 250 A

Prepared by the customer

G

SDongle

The solar inverter communicates with the management system through the SDongle.

Purchased from Huawei

1

DC input power cable

PV cable that meets the 1100 V standard

4–6 mm²

5.5–9 mm

Prepared by the customer

2

RS485 communications cable

Outdoor shielded twisted pair that meets the local standard

0.25–1 mm²

• One or two communications cables: 4–11 mm
• Three communications cables: 4–8 mm

Prepared by the customer

3

Protective earthing (PE) cable^[1]

Single-core outdoor copper cable and M10 OT/DT terminals

S_p ≥ S/2

N/A

Prepared by the customer

4

Tracking system power cable

Three-core outdoor copper cable with dual-layer protection

10 mm²

15–18 mm

Prepared by the customer

5

AC output power cable (multi-core)

• If you connect a PE cable to the ground point on the enclosure, you are advised to use a three-core (L1, L2, and L3) outdoor cable and M12 OT/DT terminals (L1, L2, and L3).
• If you connect a PE cable to the ground point in the maintenance compartment, you are advised to use a four-core (L1, L2, L3, and PE) outdoor cable, M12 OT/DT terminals (L1, L2, and L3), and M10 OT/DT terminals (PE). You do not need to prepare a PE cable.

• Copper cable:
  • S: 70–240 mm²
  • S_p ≥ S/2
• Aluminum alloy cable or copper-clad aluminum cable:
  • S: 95–240 mm²
  • S_p ≥ S/2

24–66 mm

Prepared by the customer

AC output power cable (single-core)^[2]

You are advised to use a single-core outdoor cable and M12 OT/DT terminals.

• Copper cable:
  • S: 70–240 mm²
• Aluminum alloy cable or copper-clad aluminum cable:
  • S: 95–240 mm²

14–32 mm

Prepared by the customer

Note [1]: The value of S_p is valid only if the conductors of the PE cable and AC power cable use the same material. If the materials are different, ensure that the conductor of the PE cable with a proper cross-sectional area produces a conductance equivalent to that of the cable specified in the table. The specifications of the PE cable are subject to this table or calculated according to IEC 60364-5-54.

Note [2]: For some models, the outer diameter of a single-core cable ranges from 14 mm to 36 mm based on the label in the maintenance compartment.

1

DC input power cable

PV cable that meets the 1100 V standard

4–6 mm²

5.5–9 mm

Prepared by the customer

2

RS485 communications cable

Outdoor shielded twisted pair that meets the local standard

0.25–1 mm²

• One or two communications cables: 4–11 mm
• Three communications cables: 4–8 mm

Prepared by the customer

3

PE cable^[1]

Single-core outdoor copper cable and M10 OT/DT terminals

S_p ≥ S/2

N/A

Prepared by the customer

4

Tracking system power cable

Three-core outdoor copper cable with dual-layer protection

10 mm²

15–18 mm

Prepared by the customer

5

AC output power cable (multi-core)

• If you connect a PE cable to the ground point on the enclosure and the neutral wire is not used, you are advised to use a three-core (L1, L2, and L3) outdoor cable and M12 OT/DT terminals (L1, L2, and L3).
• If you connect a PE cable to the ground point in the maintenance compartment and the neutral wire is not used, you are advised to use a four-core (L1, L2, L3, and PE) outdoor cable, M12 OT/DT terminals (L1, L2, and L3), and M10 OT/DT terminals (PE).
• If you connect a PE cable to the ground point on the enclosure and the neutral wire is used, you are advised to use a four-core (L1, L2, L3, and N) outdoor cable and M12 OT/DT terminals (L1, L2, L3, and N).
• If you connect a PE cable to the ground point in the maintenance compartment and the neutral wire is used, you are advised to use a five-core (L1, L2, L3, N, and PE) outdoor cable, M12 OT/DT terminals (L1, L2, L3, and N), and M10 OT/DT terminals (PE).

• Copper cable:
  • S: 70–240 mm²
  • S_p ≥ S/2
• Aluminum alloy cable or copper-clad aluminum cable:
  • S: 95–240 mm²
  • S_p ≥ S/2

24–66 mm

Prepared by the customer

AC output power cable (single-core)

You are advised to use a single-core outdoor cable and M12 OT/DT terminals.

• Copper cable:
  • S: 70–240 mm²
• Aluminum alloy cable or copper-clad aluminum cable:
  • S: 95–240 mm²

14–32 mm

Prepared by the customer

Note [1]: The value of S_p is valid only if the conductors of the PE cable and AC power cable use the same material. If the materials are different, ensure that the conductor of the PE cable with a proper cross-sectional area produces a conductance equivalent to that of the cable specified in the table. The specifications of the PE cable are subject to this table or calculated according to IEC 60364-5-54.