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4
Connecting Cables
4.1
Preparations
•
Do not connect loads between the inverter and the AC switch that directly connects to the
inverter. Otherwise, the switch may trip by mistake.
If an AC switch is used with specifications beyond local standards, regulations, or Huawei's
•
recommendations, the switch may fail to turn off in a timely manner in case of exceptions,
causing serious faults.
Each inverter must be equipped with an AC output switch. Multiple inverters cannot connect to
the same AC output 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.
•
The cable specifications must comply with local standards. Connect cables in accordance with
local installation laws and regulations.
•
Before connecting cables, ensure that the DC switch of the solar inverter and all the switches
connected to it are set to OFF. Otherwise, the high voltage produced by the solar inverter
may cause electric shocks.
No. Cable
1
PE cable
AC output power
2
cable
DC input power
3
cable
(Optional) RS485
4
communications
cable
AC circuit
5
breaker
Type
Single-core outdoor copper-
core cable
Outdoor copper-
core/aluminum-core cable
Common outdoor PV cable in
the industry (recommended
model: PV1-F)
Two-core outdoor shielded
twisted pair
Recommended: three-phase
AC circuit breaker
Specifications
Conductor cross-sectional area ≥ 5.5 mm
•
Conductor cross-sectional area: 25-50
2
mm
outdoor copper-core cable or 35-
2
50 mm
outdoor aluminum-core cable
•
Cable outer diameter: 16–38 mm
•
Conductor cross-sectional area: 3.5–6
2
mm
•
Cable outer diameter: 5.5–9 mm
•
Conductor cross-sectional area: 0.2–1
2
mm
•
Cable outer diameter: 4–11 mm
Rated voltage ≥ 500 V AC
Rated current: 125 A
4
2
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