Growatt WIT 50-100K-US User manual

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WIT 50-100K-US Storage/Hybrid Inverter
User Manual
Growatt USA, Inc
9227 Reseda Blvd, #435 Northridge, CA 91324, USA
T 866-686-0298
E [e-mail]
W www.growatt-america.com

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Contents
1. Notes on this manual ...................................................................................................................... 4
1.1 Introduction ...........................................................................................................................4
1.2 Target Group .........................................................................................................................4
1.3 Product Range .......................................................................................................................4
2. Safety Precautions .......................................................................................................................... 4
2.1 Safety Instructions ................................................................................................................ 5
2.2 Symbol Conventions .............................................................................................................6
2.3 Label Description ..................................................................................................................7
3. Product Description ........................................................................................................................ 8
3.1 Overview ...............................................................................................................................8
3.2 Basic Data ........................................................................................................................... 11
3.3 Nameplate ........................................................................................................................... 12
3.4 Operating Principle .............................................................................................................13
3.4.1 Operating Principle of WIT 50-100K-A-US ...........................................................13
3.4.2 Operating Principle of WIT 50-100K-H-US ...........................................................13
3.4.3 Operating Principle of WIT 50-100K-AE-US and WIT 50-100K-AU-US ............13
3.4.4 Operating Principle of WIT 50-100K-HE-US and WIT 50-100K-HU-US ............14
3.5 Storing the WIT Inverter .................................................................................................... 14
3.6 Supported Grid Types .........................................................................................................15
3.7 AFCI Function .................................................................................................................... 15
3.7.1 AFIC Function Description ..................................................................................... 15
3.7.2 Clearing the alarm ................................................................................................... 15
3.8 Anti-PID Function .............................................................................................................. 16
4. Inspection upon delivery .............................................................................................................. 17
5. Installation .................................................................................................................................... 19
5.1 Basic Installation Requirements ......................................................................................... 19
5.2 Installation Environment Requirements .............................................................................20
5.3 Moving the WIT Inverter ................................................................................................... 21
5.4 Mounting the WIT Inverter ................................................................................................ 22
5.4.1 Ground-mounted Installation .................................................................................. 22
5.4.2 Wall-mounted Installation ....................................................................................... 23
6. Electrical Connections .......................................................................................................... 25
6.1 Connecting the Ground Cables ...........................................................................................29
6.2 Connection on the AC Side ................................................................................................ 29
6.3 Connection on the PV Side .................................................................................................32
6.4 Connection on the Battery Side ..........................................................................................34
6.4.1 Connecting the Main Power Cable of the Battery .................................................. 34
6.4.2 Connecting the Battery BMS-AC Terminal ............................................................35
6.5 Connecting Communication Cables ...................................................................................36
6.5.1 Battery Communication Connection .......................................................................36
6.5.2 External Communication Connection ..................................................................... 38
6.5.3 Parallel Communication Connection ...................................................................... 39

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6.5.4 Monitoring Device Terminal ................................................................................... 43
6.5.5 DRMS Port .............................................................................................................. 43
6.5.6 Rapid Shutdown Device (RSD) .............................................................................. 44
6.6 Post-installation Checks ............................................................................................. 46
7. Commissioning ............................................................................................................................. 47
7.1 Commissioning the WIT Inverter .......................................................................................47
7.1.1 Set the Communication Address ............................................................................. 47
7.1.2 Set the Time and Date ..............................................................................................47
7.2 Mode of operation .............................................................................................................. 48
7.2.1 Waiting Mode .......................................................................................................... 48
7.2.2 Operating Mode .......................................................................................................48
7.2.3 Fault Mode ...............................................................................................................49
7.2.4 Shutdown Mode .......................................................................................................49
7.3 LED and OLED Display Panel ...........................................................................................50
8. Monitoring ............................................................................................................................ 53
8.1 Remote Monitoring .............................................................................................................53
8.1.1 Remote Monitoring on the APP (ShinePhone) ....................................................... 53
9. System Maintenance .....................................................................................................................68
9.1 Routine Maintenance .......................................................................................................... 68
9.1.1 Clean the Chassis .....................................................................................................68
9.1.2 Fan Maintenance ..................................................................................................... 68
9.2 Troubleshooting ..................................................................................................................70
9.2.1 Warning ....................................................................................................................70
9.2.2 Error ......................................................................................................................... 72
10. Product Specifications ................................................................................................................ 78
Table 10.1 WIT 50/63/75/100K-A-US specification .......................................................78
Table 10.2 WIT 50/63/75/100K-H-US specification .......................................................81
Table 10.3 WIT 50/63/75/100K-AE-US specification .................................................... 84
Table 10.4 WIT 50/63/75/100K-HE-US specification .................................................... 87
Table 10.5 WIT 50/63/75/100K-AU-US specification ....................................................90
Table 10.6 WIT 50/63/75/100K-HU-US specification ....................................................93
11. Decommissioning the WIT Inverter ...........................................................................................96
12. Warranty ..................................................................................................................................... 97
12.1 Conditions .........................................................................................................................97
12.2 Disclaimer .........................................................................................................................97
13. Contact Us ...................................................................................................................................98

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1. Notes on this manual
1.1 Introduction
This manual is intended to introduce the WIT 50-100K Storage/Hybrid Inverters manufactured by
Shenzhen Growatt New Energy Co.,Ltd. (hereinafter referred to as Growatt) in terms of their
installation, operation, commissioning, maintenance and troubleshooting. Please read this manual
carefully before using the product, and keep it in a convenient place for further reference. The
content of this manual is continually reviewed and amended, where necessary. Growatt reserves
the right to make changes to the material at any time and without notice.
Note: “WIT” refers to the product name. “50-100K” refers to the power range. The WIT inverters
include both Storage Inverter models and Hybrid Inverter models.
1.2 Target Group
This document is intended for qualified technicians. Only qualified and well-trained technicians
are allowed to install and operate the WIT inverter. Should any questions arise during installation,
you can visit www.growatt.com to leave a message, or call our 24-hour service hotline at
866-686-0298.
1.3 Product Range
The WIT 50-100K-US (380V/400V) inverters consist of six models, each offering four power
options: 50kW, 63kW, 75kW, and 100kW. In total, there are 24 products available in this series.
This manual is valid for the following models:
Table 1.1 WIT 50-100K-US series modelsProduct model introduction
WIT 50K-A-US
3-Phase Storage Inverter
WIT 50K-H-US
3-Phase Hybrid Inverter
WIT 63K-A-US
WIT 63K-H-US
WIT 75K-A-US
WIT 75K-H-US
WIT 100K-A-US
WIT 100K-H-US
WIT 50K-AE-US
3-Phase Storage Inverter with
EPS function
WIT 50K-HE-US
3-Phase Hybrid Inverter with
EPS function
WIT 63K-AE-US
WIT 63K-HE-US
WIT 75K-AE-US
WIT 75K-HE-US
WIT 100K-AE-US
WIT 100K-HE-US
WIT 50K-AU-US
3-Phase Storage Inverter with
UPS function
WIT 50K-HU-US
3-Phase Hybrid Inverter with
UPS function
WIT 63K-AU-US
WIT 63K-HU-US
WIT 75K-AU-US
WIT 75K-HU-US
WIT 100K-AU-US
WIT 100K-HU-US

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2. Safety Precautions
2.1 Safety Instructions
1) Please read this manual carefully before installation. Damages caused by failure to follow the
instructions in the manual are beyond the warranty scope.
2) Only qualified and trained electrical technicians are allowed to perform operations on the
WIT Inverter.
3) During installation, please do not touch other parts inside the equipment other than the wiring
terminals.
4) Ensure that all electrical connections comply with local electrical standards.
5) Only designated personnel are permitted to perform maintenance on the inverter.
6) Before operating the WIT Inverter in the on-grid mode, ensure that you have obtained any
permission needed from the local grid operator.
Transportation：
●Risk of injury when lifting the WIT Inverter, or injury caused by a falling
inverter as it is heavy. Please transport and lift the inverter carefully.
Installation：
●Please read this manual carefully before installation. Damages caused by
failure to observe instructions specified in this manual are not covered under
any warranty.
●Do not connect any cables before installation.
●Please observe the installation instructions specified in this manual, including
the installation environment and clearance requirements.
●Install the WIT Inverter in a dry and well-ventilated location; otherwise,
performance de-rate may be initiated due to excessive temperature.
●Please read the installation instructions and safety precautions carefully
before installation.
Electrical Connections:
●Before connecting cables, ensure that the DC switches of the WIT Inverter
are OFF, and turn off the switch and breaker on the AC side and the battery
side. Otherwise, high voltages may cause severe injuries.
●It must be operated by qualified and trained electrical technicians.
Technicians should observe instructions in this manual and local regulations.
●High voltages may cause electric shocks and serious injury. Please do not
touch the WIT Inverter in operation.
●Do not install the inverter in potentially explosive and flammable
atmospheres.

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●Each WIT Inverter must be equipped with an AC circuit breaker. Multiple
WIT Inverters cannot connect to the same AC circuit breaker.
●Do not connect the load between the WIT Inverter and the circuit breaker.
●If the cable is thick, do not shake the cable terminals after tightening them.
Otherwise, the loose connection may cause overheating and device damage.
Ensure that the terminals are properly connected before starting the WIT
Inverter.
●Ensure the correct polarity of the terminals before connecting the PV array to
the WIT Inverter.
Maintenance and replacement:
●It must be operated by qualified and trained electrical technicians.
Technicians should observe instructions in this manual and local regulations.
●After turning off the DC switches and the AC breakers, wait for at least five
minutes before performing any operations to avoid risks.
●When the OLED screen indicates “PV Isolation low”, do not touch the
chassis as a ground fault may have been detected.
●Beware of high voltages which may cause electric shocks.
●To ensure good dissipation, clean the fan regularly.
●Do not use the air pump to clean the fan. Otherwise, the fan may be
damaged.
Others：
●Upon receiving the product, check if the contents are intact and complete. If
any damage is found or any component is missing, please contact your
distributor.
●The maximum PV input voltage cannot exceed 1100V. The battery input
voltage cannot exceed 1000V.
●For the WIT Inverter that will not be put into operation in the future, you
should properly dispose of them by yourself.
2.2 Symbol Conventions
Symbol
Description
DANGER indicates a hazard with a high level of risk which, if not avoided,
will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION indicates a hazard with potential risk which, if not avoided, could
result in minor or moderate injury.

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NOTICE indicates that under certain circumstances, improper operations
could result in property damage.
Remind operators to check the instructions before installing or operating the
WIT Inverter.
2.3 Label Description
Symbol
Name
Meaning
High voltage
High voltages exist after the WIT Inverter is powered on.
Only qualified and trained electrical technicians are
allowed to perform operations.
Burn warning
Do not touch a running inverter because it generates high
temperatures on the shell.
Grounding
Indicates the position for connecting the PE cable.
Delay discharge
mark
Residual voltage exists after the WIT Inverter is powered
off. It takes 5 minutes to discharge to the safe voltage.
Refer to the
manual
Remind operators to refer to the manual before installing
and operating the WIT Inverter.
DC
Direct Current.
AC
Alternating Current.

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3. Product Description
The front view and the bottom view of all models are identical.
3.1 Overview
Front view:
Fig 3.1 Front view
Bottom view:
Fig 3.2 Bottom view

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Left view:
Fig 3.3 Left view of WIT 50-100K-A-US and WIT 50-100K-H-US
Fig 3.4 Left view of WIT 50-100K-AE-US, WIT 50-100K-AU-US, WIT 50-100K-HE-US and
WIT 50-100K-HU-US

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Right view:
Fig 3.5 Right view of WIT 50-100K-A-US, WIT 50-100K-AE-US and WIT 50-100K-AU-US
Fig 3.6 Right view of WIT 50-100K-H-US, WIT 50-100K-HE-US, WIT 50-100K-HU-US

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Table 3.1 Component description
No.
Description
No.
Description
A
Display
B
AC junction box
C
Base
D
Power grid connection terminal
E
Load wiring terminal
F
Heat sink
G
Nameplate
H
Fan
I
16-pin terminal (BMS COM)
J
30-pin terminal (COM2)
K
16-pin terminal (COM1)
L
USB interface box
M
DC Switch
N
PV terminal
O
Battery supply terminal (BMS AC)
P
Battery terminal
Q
DRMS port
R
Flexible handle (4 groups)
S
Fixed handle
T
Indicator description label
3.2 Basic Data
Table 3.2 Dimensions and weight
Model
Size（in)
Weight
(lb)
Height
Width
Depth
The WIT
Inverter
without
package
WIT 50/63/75/100K-A-US
53.2
33.5
20.1
265/265/265/265
WIT 50/63/75/100K-H-US
294/294/309/309
WIT 50/63/75/100K-AE-US
287/287/287/287
WIT 50/63/75/100K-HE-US
316/316/331/331
WIT 50/63/75/100K-AU-US
309/309/309/309
WIT 50/63/75/100K-HU-US
338/338/353/353
The WIT
Inverter with
package
WIT 50/63/75/100K-A-US
60.0
38.9
28.9
353/353/353/353
WIT 50/63/75/100K-H-US
382/382/397/397
WIT 50/63/75/100K-AE-US
375/375/375/375
WIT 50/63/75/100K-HE-US
404/404/419/419
WIT 50/63/75/100K-AU-US
397/397/397/397
WIT 50/63/75/100K-HU-US
426/426/441/441

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3.3 Nameplate
Fig 3.7 Nameplate
NOTE: The figure above shows the nameplate of WIT 100K-HU-US as an example.The
nameplate figure is for reference only. The actual nameplate prevails. For the specifications,
please refer to Section 10 Product Specifications.

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3.4 Operating Principle
3.4.1 Operating Principle of WIT 50-100K-A-US
1> Convert DC power into AC power consistent with the voltage and power quality requirements
of the utility grid through an inverter circuit to supply power to the loads and feed power into the
grid;
2> Convert AC power into DC power through a rectifying circuit to charge the battery.
Fig 3.8 WIT 50-100K-A-US Grid-connected conceptual diagram
3.4.2 Operating Principle of WIT 50-100K-H-US
1> The hybrid inverter receives DC inputs form the PV strings which go through the MPPT
routes. The DC power is then converted to AC power through an inverter circuit to power the
loads and feed power into the grid;
2> The PV strings can put out power to charge the battery through the MPPT routes;
3> Convert battery power to AC power supplies for the loads and feeding to the grid;
4> Charge the battery from the grid through a rectifier circuit.
NOTE: WIT 50K-H-US models have 7 MPPT routes. WIT 63K-H models have 8 MPPT routes. WIT 75K-H and
WIT 100K-H models have 10 MPPT routes.
Fig 3.9 WIT 50-100K-H-US Grid-connected conceptual diagram
3.4.3 Operating Principle of WIT 50-100K-AE-US and WIT 50-100K-AU-US
1> Convert battery power to AC power to power the loads and export energy to the grid;

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2> Charge the battery from the grid through a rectifier circuit;
3> Convert the battery power into AC power through the inverter circuit to provide power to
critical loads connected to the LOAD port.
Fig 3.10 WIT 50-100K-AE-US, WIT 50-100K-AU-US Grid-connected conceptual diagram
3.4.4 Operating Principle of WIT 50-100K-HE-US and WIT 50-100K-HU-US
1> The hybrid inverter receives DC inputs from PV strings which go through the MPPT routes.
The DC power is then converted into AC power through the inverter circuit to power the loads and
feed power into the grid;
2> The PV strings can supply power to charge the battery through the MPPT routes;
3> Convert battery power to AC power supplies for the loads and feeding to the grid;
4> Charge the battery from the grid through a rectifier circuit;
5> Convert the DC power from PV strings and the battery power into AC power through the
inverter circuit to power critical loads.
NOTE: WIT 50K-HE/-HU-US models have 7 MPPT routes. WIT 63K-HE/-HU models have 8 MPPT routes.
WIT 75K-HE/-HU-US and WIT 100K-HE/-HU-US models have 10 MPPT routes.
Fig 3.11 WIT 50-100K-HE-US, WIT 50-100K-HU-US Grid-connected conceptual diagram
3.5 Storing the WIT Inverter
1> Put the WIT Inverter in the original package and place it in a dry and well-ventilated place.
2> Keep the storage temperature from –30°C to +70°C and the humidity from 0%–95% RH.
3> A maximum of three WIT Inverters can be stacked. Do not stack the inverters without package.
4> If the WIT Inverter has been long-term stored, inspections and tests should be conducted by
qualified personnel before installation.

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Wrong time and date may occur if the WIT Inverter has been stored for over
one month. Fix the time and date before connecting the inverter to the grid. For
details, see 7.1 Commissioning the WIT Inverter.
3.6 Supported Grid Types
Grid connection modes for WIT 50-100K-US Storage/Hybrid Inverters are shown in Fig 3.12.
Fig 3.12 380V /400V system (Type Y/△)
3.7 AFCI Function
3.7.1 AFIC Function Description
An AFCI, or Arc-Fault Circuit Interrupter, is a solution designed to detect and mitigate the risk of
electrical arcing in a photovoltaic (PV) system, supported by intelligent arc detection algorithm.
Arcing can occur when there is a high voltage breakdown in the electrical insulation or when
conductive materials come into contact with each other. This can pose a fire hazard and damage
the system components. The AFCI continuously monitors the system for potential arc faults and, if
detected, interrupts the circuit to prevent a fire or other damage. AFCIs are required by the
National Electrical Code (NEC) in certain parts of a PV system, such as the DC side of the
inverter, to improve safety and reduce the risk of fires.
NOTE: 1. The AFCI Function of the WIT Inverter is disabled by default. If you want to enable the
AFCI, please contact Growatt support.
2. Do not wire the Maximum Power Point Trackers (MPPTs) on the DC side in parallel as it might
trigger the AFCI mistakenly.
3.7.2 Clearing the alarm
In the event that the WIT Inverter reports “Error 200” and the PV indicator turns red, an arc fault
might have been detected. Please perform the following steps to clear the alarm.
Step 1: Disconnect the WIT inverter from all power sources. Turn off the battery switch and the
AC output circuit breaker, then turn the DC switches to the OFF position. Wait until the error

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message disappears.
Step 2: Troubleshooting. Check if the open-circuit of all PV strings are within the permissible
range.
Step 3: After the fault is rectified, restart the inverter. Turn on the battery switch and the AC
breaker, and turn the DC switch to the ON position. Wait until the system is working properly.
If the WIT Inverter passes the AFCI self-test, it will work in the normal mode and the PV
indicator will be green. If it fails, the inverter will report “Error 425”. In this case, please reboot
the system and perform Step 1 to Step 3. If it failed again, please disconnect all power sources and
contact Growatt support.
3.8 Anti-PID Function
PID refers to the potential induced degradation. It occurs when a large amount of charge
accumulates on the surface of the PV modules, causing the surface passivation to deteriorate. This
leads to a decrease in the fill factor, open-circuit voltage, short-circuit current, and the power
output of the PV modules. The Anti-PID function enables the WIT Inverters to mitigate the PID
effect by rectifying and boosting the AC voltage or battery voltage during nighttime to generate a
DC voltage. The DC voltage is connected to the PV positive terminal and the ground, applying a
positive bias to reverse the PID effect and extend the service life of the PV modules.
NOTE: The Anti-PID function is optional.

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4. Inspection upon delivery
Unpacking and inspection
1> Before unpacking the WIT Inverter, check the shipping box for any externally visible damage.
If any damage is found, contact the shipping company as soon as possible.
2> After unpacking the WIT Inverter, check if the scope of delivery is intact and complete. If any
damage is found or any component is missing, contact your distributor.
Check the following items:
Fig 4.1 Packing list of WIT 50-100K-A-US, WIT 50-100K-AE-US and WIT 50-100K-AU-US
Fig 4.2 Packing list of WIT 50-100K-H-US, WIT 50-100K-HE-US and WIT 50-100K-HU-US
Table 4.1 Packing list
No.
Description
Quantity
A
The WIT Inverter
1
B
PV+ connector, PV - connector
20/20
C
PV+ metal contact, PV- metal contact
20/20
D
Battery + terminal, Battery - terminal
1/1
E
16-pin terminal
2
F
30-pin terminal
1 or 2
G
Antenna
1 or 2
H
RJ45 connector protector
1
I
BMS power supply terminal
1
J
User manual
1
K
Quick installation guide
1
L
Hoist ring
2
M
RSD and accessories
1

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NOTE:
1. For the WIT 50-100K-H-US, WIT 50-100K-HE-US, WIT 50-100K-HU-US inverters, 14 pairs of PV
terminals and 14 pairs o3.2f metal contacts are delivered with the 50kW models; 16 pairs of PV terminals and
16 pairs of metal contacts are delivered with 63kW models; 20 pairs of PV terminals and 20 pairs of metal
contacts are delivered with 75kW and 100kW models.
2. For remote monitoring, if the WiFi&Lan datalogger is selected, one antenna (WiFi) and two RJ45 connectors
are provided; if the WiFi&4G datalogger is selected, two antennas (WiFi and 4G) and one RJ45 connector are
provided.
3. Models with the RSD function are delivered with the "M" component.
4. Sturdy and durable though the packing is, please carry and handle it with caution.

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5.Installation
5.1 Basic Installation Requirements
A. Ensure that the installation surface is solid enough to bear the weight of the WIT Inverter.
(Refer to Table 3.2 for the weight of the WIT Inverter)
B. Ensure that the installation position is suitable for the dimensions of the WIT Inverter.
C. Do not install the WIT Inverter in areas with flammable or thermolabile materials.
D. The WIT Inverter is protected to IP66 and can be installed indoors or outdoors.
E. Do not expose the WIT Inverter to direct sunlight. Otherwise, excessive temperature may
lead to power reduction.
F. Keep the humidity at 0% to 95% RH.
G. Keep the ambient temperature at -30℃ to 60℃.
H. The WIT inverter can only be vertically mounted on a flat ground or a vertical wall. Please
refer to the following figures:
Fig 5.1
I. Reserve enough clearance around the WIT Inverter to ensure sufficient space for heat
dissipation and operation. Ensure that there are no objects within 1 m of the left, right and top
of the WIT Inverter; In ground-mounted installation, keep the back of the chassis at least 0.1
m away from the wall surface to ensure the performance of the WIT Inverter.
Fig 5.2
J. Keep the WIT Inverter away from strong interference sources.
K. Ensure that the WIT Inverter is not accessible to children.

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5.2 Installation Environment Requirements
A. Though the WIT Inverter is protected to IP66, do not expose it to direct sunlight, rain and
snow. Please refer to the figures below:
Fig 5.3
B. It is recommended an awning be installed over the WIT Inverter to extend its service life and
avoid performance de-rate. Ensure that a distance of at least 1 m exists between the frame of
the awning and the top of the WIT Inverter and 1.5 m between the sides of the awning and
the WIT Inverter. Please refer to the figures below.
Fig 5.4
C. Do not place the WIT Inverter in an enclosed and narrow space for operation.
Fig 5.5