Connection On The Ac Side - Growatt WIT 50K-A User Manual

6.2 Connection on the AC Side

Ÿ Before connecting cables, ensure that the DC switches on the WIT
Inverter are OFF. Turn off the switches and breakers on the AC side and
the battery side. Otherwise, the high voltages of the WIT Inverter may
result in electric shocks.
Only qualified and trained electrical technicians are allowed to
Ÿ
perform operations. Technicians must observe instructions in this
manual and local regulations.
DANGER
Ÿ High voltages may cause electric shocks and serious injury. Please do
not touch the inverter in operation.
Ÿ Do not place inflammable and explosive materials around the WIT
Inverter.
Ÿ Each WIT Inverter must be equipped with an AC circuit breaker.
Multiple WIT Inverters cannot connect to the same AC circuit breaker
(not applicable to off-grid mode).
Please do not connect loads between the WIT Inverter and the circuit
Ÿ
breaker.
If the cable is thick, do not shake the cable terminals after tightening
Ÿ
them. Otherwise, the loose connection may cause overheating that
WARNING
will damage the device. Ensure that the terminals are properly
connected before powering on the WIT Inverter.
Ÿ After connecting the cables, apply the fireproof mud evenly on the
waterproof silica gel pad inside the AC junction box to prevent water
from entering into the box.
Preparation:
1> Ensure the grid voltage and the grid frequency are within the acceptable range;
2> Disconnect the DC switches and the breakers on the AC side and the battery side.
The circuit breaker on the AC side:
A circuit breaker needs to be installed on the AC side, ensuring a safe disconnection
between the WIT Inverter and the upstream input when an exception occurs.
1. Recommended circuit breaker specifications for WIT 50-100K-A and WIT 50-100K-H
models.
Rated voltage of the circuit
Device type
WIT 50K-A/-H
WIT 63K-A/-H
WIT 75K-A/-H
WIT 100K-A/-H
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Rated current of the circuit
breaker breaker
400V 150A
400V 150A
400V 200A
400V 200A
2. Recommended circuit breaker specifications for WIT 50-100K-AE, WIT 50-100K-AU,
WIT 50-100K-HE and WIT 50-100K-HU models.
Rated voltage of
Device type
the circuit breaker
WIT 50K-AE/-AU/-HE/
400V
-HU
WIT 63K-AE/-AU/-HE/
400V
-HU
WIT 75K-AE/-AU/-HE/
400V
-HU
WIT 100K-AE/-AU/
400V
-HE/-HU
Recommended power cable specifications:
1. Recommended AC power cable specifications for WIT 50-100K-A and WIT 50-100K-H
models.
Device type
WIT 50K-A/-H
WIT 63K-A/-H
WIT 75K-A/-H
WIT 100K-A/-H
2. Recommended AC power cable specifications for WIT 50-100K-AE, WIT 50-100K-AU,
WIT 50-100K-HE and WIT 50-100K-HU models.
Recommended cable
Device type specification on the grid
WIT 50K-AE/-AU/-HE/-HU
WIT 63K-AE/-AU/-HE/-HU
WIT 75K-AE/-AU/-HE/-HU
WIT 100K-AE/-AU/-HE/-HU
NOTE: The wires should be tinned and are not frayed or cracked.
AC side connection steps:
1. Open the cover of the AC junction box. The position of the cover is shown in Fig 6.2;
2. Connect a ground cable to the copper grounding bar in the AC junction box. Fig 6.2
shows the position of the grounding bar inside the AC junction box;
3. Connect the main power cables according to the label. Fig 6.2 shows the position of the
label and the AC terminals.
Rated current of Rated current of
the circuit breaker the circuit breaker
on the grid side on the load side
300A 150A
300A 150A
400A 250A
400A 250A
Recommended cable specification
2
35mm
35mm 2
2
70mm
70mm 2
Recommended cable
specification on the load
side side
95mm 2 35mm 2
2 2
95mm 35mm
150mm 2 70mm 2
2 2
150mm 70mm
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