SolaX Power X3-ULTRA User manual

www.solaxpower.com
X3-ULTRA
User Manual
15 kW / 19.9 kW / 20 kW / 25 kW / 30 kW
eManual in the QR code or at
http://kb.solaxpower.com/

I
STATEMENT
Copyright
Copyright © SolaX Power Technology (Zhejiang) Co., Ltd. All rights reserved.
No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language or computer language, in any form or by any
means without the prior written permission of SolaX Power Technology (Zhejiang) Co., Ltd.
Trademarks
and other symbol or design (brand name, logo) that distinguishes the products or
services offered by SolaX has been trademark protected. Any unauthorized use of the
above stated trademark may infringe the trademark right.
Notice
Please note that certain products, features, and services mentioned in this document
may not be within the scope of your purchase or usage. Unless otherwise specified in the
contract, the contents, information, and recommendations presented in this document are
provided "as is" by SolaX. We do not provide any warranties, guarantees, or representations,
whether express or implied.
The content of the documents is reviewed and updated as needed. However, occasional
discrepancies may occur. SolaX retains the right to make improvements or changes in the
product(s) and the program(s) described in this manual at any time without prior notice.
The images included in this document are solely for illustrative purposes and may differ
based on the specific product models.
For more detailed information, kindly visit the website of SolaX Power Technology (Zhejiang)
Co., Ltd. at www.solaxpower.com.
SolaX retains all rights for the final explanation.

II
About This Manual
Scope of Validity
This manual is an integral part of X3-ULTRA series inverter. It describes
the installation, electrical connection, commissioning, maintenance and
troubleshooting of the product. Please read it carefully before operating.
This manual is valid for the following inverter models:
• X3-ULT-15K
• X3-ULT-19.9K (Applicable to Italy)
• X3-ULT-20K
• X3-ULT-25K
• X3-ULT-30K
Model Description
X3-ULT-15K
12
Item Meaning Description
1Product
family name
"X3-ULTRA" refers to the energy storage inverter
that supports grid connection of photovoltaic
system.
2 Power "15K" refers to the rated output power of 15 kW.
Target Group
The installation, maintenance and grid-related setting can only be
performed by qualified personnel who:
• Are licensed and/or satisfy state and local jurisdiction regulations.
• Have good knowledge of this manual and other related documents.

III
Conventions
The symbols that may be found in this manual are defined as follows.
Symbol Description
DANGER Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION! Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE! Provides tips for the optimal operation of the
product.
Change History
Version 00 (2023-06-28)
Initial release

IV
Table of Contents
1 Safety ..........................................................................................................1
1.1 General Safety ....................................................................................................................1
1.2 Safety Instructions of PV, Inverter and Grid ...............................................................1
1.2.1 Safety Instructions of PV ....................................................................................2
1.2.2 Safety Instructions of Inverter...........................................................................2
1.2.3 Safety Instructions of Utility Grid.....................................................................3
2 Product Overview ....................................................................................4
2.1 System Description ...........................................................................................................4
2.2 Supported Power Grid .....................................................................................................6
2.3 Appearance .........................................................................................................................7
2.4 Symbols on the Label and Inverter...............................................................................8
2.5 Working Principle...............................................................................................................9
2.5.1 Circuit Diagram.....................................................................................................9
2.5.2 Application Schemes ..........................................................................................10
2.6 Working State......................................................................................................................12
2.7 Working Mode ....................................................................................................................13
2.7.1 Self-use Mode (Priority: Loads > Battery > Grid) .........................................13
2.7.2 Feed-in Priority (Priority: Loads > Grid > Battery) .......................................15
2.7.3 Backup Mode (Priority: Loads > Battery > Grid) ..........................................16
2.7.4 Peak Shaving Mode ............................................................................................18
2.7.5 Schedule Mode.....................................................................................................19
2.7.6 EPS Mode (Priority: Loads > Battery) ..............................................................21
2.7.7 Manual Mode.........................................................................................................22
2.7.8 Export Control Function ....................................................................................22
3 Transportation and Storage ...................................................................24
4 Preparation before Installation..............................................................25
4.1 Selection of Installation Location .................................................................................25
4.1.1 Environment Requirement ................................................................................25
4.1.2 Installation Carrier Requirement......................................................................26
4.1.3 Clearance Requirement .....................................................................................27
4.2 Tools Requirement............................................................................................................28
4.3 Additionally Required Materials .....................................................................................29
5 Unpacking and Inspection .....................................................................30
5.1 Unpacking............................................................................................................................30

V
5.2 Scope of Delivery...............................................................................................................31
6 Mechanical Installation ...........................................................................33
6.1 Dimensions for mounting...............................................................................................34
6.2 Installation procedures.....................................................................................................35
7 Electrical Connection .............................................................................38
7.1 Terminals of Inverter .........................................................................................................38
7.2 PE Connection ...................................................................................................................39
7.3 AC Connection...................................................................................................................42
7.4 PV Connection ...................................................................................................................46
7.5 Battery Power Cable Connection.................................................................................50
7.6 COM 1 Communication Connection ..........................................................................57
7.6.1 Pin Assignment of COM 1 Teriminal ...............................................................57
7.6.2 Parallel Connection.............................................................................................58
7.6.3 BMS Communication Connection .................................................................63
7.6.4 RS485 Communication Connection .............................................................65
7.6.5 DRM Connection (Applicable to AS/NZS 4777) ..........................................66
7.7 COM 2 Communication Connection..........................................................................68
7.7.1 Pin Assignment of COM 2 Teriminal...............................................................68
7.7.2 Meter/CT Connection.........................................................................................69
7.7.3 Ripple Control Communication Connection ..............................................74
7.7.4 DIO Communication Connection ..................................................................75
7.8 Monitoring Connection...................................................................................................77
8 System Commissioning..........................................................................80
8.1 Checking before Power-on ............................................................................................80
8.2 Powering on the System..................................................................................................80
9 Operation on LCD....................................................................................81
9.1 Introduction of Control Panel........................................................................................81
9.2 Introduction of Menu Interface.....................................................................................82
9.3 System ON/OFF..................................................................................................................85
9.4 Mode Select ........................................................................................................................85
9.5 System Status ......................................................................................................................85
9.6 Parallel Status ......................................................................................................................87
9.7 History Data.........................................................................................................................87
9.8 Setting ...................................................................................................................................90
9.8.1 User Setting............................................................................................................90
9.8.2 Advanced Setting .................................................................................................97
9.9 About.....................................................................................................................................112

VI
10 Operation on SolaX Cloud App.............................................................113
10.1 Introduction of SolaX Cloud App..................................................................................113
10.2 Downloading and installing App...................................................................................113
10.2.1 Downloading and installing App......................................................................113
10.3 Operation Guide on SolaXCloud Web ........................................................................114
11 Troubleshooting and Maintenance ......................................................115
11.1 Power off..............................................................................................................................115
11.2 Troubleshooting.................................................................................................................115
11.3 Maintenance........................................................................................................................124
11.3.1 Maintenance routines ........................................................................................124
11.3.2 Replacement of Fans...........................................................................................125
11.3.3 Upgrading Firmware............................................................................................126
12 Decommissioning....................................................................................128
12.1 Disassembling the Inverter ............................................................................................128
12.2 Packing the Inverter ..........................................................................................................130
12.3 Disposing of the Inverter .................................................................................................130
13 Technical Data ..........................................................................................131
14 Appendix ...................................................................................................135
14.1 Generator Application......................................................................................................135
14.2 Adapter Box Application ..................................................................................................140
14.3 EV-Charger Application ...................................................................................................143
14.4 Datahub Application .........................................................................................................146
14.5 Micro-grid Application .....................................................................................................149

1
1 Safety
1.1 General Safety
The series inverter has been meticulously designed and thoroughly tested to comply
with all relevant state and international safety standards. Nevertheless, like all electrical
and electronic equipment, safety precautions must be observed and followed during
the installation of the inverter to minimize the risk of personal injury and ensure a safe
installation.
Please thoroughly read, comprehend, and strictly adhere to the comprehensive instructions
provided in the user manual and any other relevant regulations prior to the installation of
the inverter. The safety instructions in this document serve as supplementary guidelines to
local laws and regulations.
SolaX shall not be liable for any consequences resulting from the violation of the storage,
transportation, installation, and operation regulations outlined in this document. Such
consequences include, but are not limited to:
• Inverter damage caused by force majeure events, such as earthquakes, floods,
thunderstorms, lightning, fire hazards, volcanic eruptions, and similar events.
• Inverter damage due to human causes.
• Usage or operation of the inverter in violation of local policies or regulations.
• Failure to comply with the operation instructions and safety precautions provided
with the product and in this document.
• Improper installation or usage of the inverter in unsuitable environmental or
electrical conditions.
• Unauthorized modifications to the product or software.
• Inverter damage occurring during transportation by the customer.
• Storage conditions that do not meet the requirements specified in this document.
• Installation and commissioning performed by unauthorized personnel who
lack the necessary licenses or do not comply with state and local jurisdiction
regulations.
1.2 Safety Instructions of PV, Inverter and Grid
Save these important safety instructions. Failure to do so may result in damage to the
inverter and injury or even loss of life.

2
Safety
1.2.1 Safety Instructions of PV
DANGER!
Potential risk of lethal electrical shock associated with the photovoltaic (PV) system
• Exposure to sunlight can result in the generation of high DC voltage by PV modules,
which can lead to electric shock causing severe injuries or even death.
• Never touch the positive or negative poles of the PV connecting device, and avoid
touching both poles simultaneously.
• Do not ground the positive or negative poles of the PV modules.
• Only qualified personnel can perform the wiring of the PV modules.
WARNING!
• Overvoltage protection with surge arresters should be provided when the PV power
system is installed. The grid connected inverter is fitted with SPDs on both PV input
side and MAINS side.
• Please consult professionals before installing SPDs.
WARNING!
• Make sure that the input DC voltage does not exceed the maximum DC input voltage
specified for the inverter. Overvoltage can cause irreversible damage to the inverter,
and such damage is not covered by the warranty.
1.2.2 Safety Instructions of Inverter
DANGER!
Potential risk of lethal electrical shock associated with the inverter
• Only operate the inverter if it is in a technically faultless condition. Operating a faulty
inverter may lead to electric shock or fire.
• Do not attempt to open the enclosure without authorization from SolaX.
Unauthorized opening of the enclosure will void the warranty and can result in lethal
danger or serious injury due to electric shock.
• Make sure that the inverter is reliably grounded before any operation to prevent the
risk of electric shock causing lethal danger or serious injury.
• Only qualified personnel can perform the installation, wiring, maintenance of the
inverter by following this document and the related regulations.
DANGER!
• Prior to any wiring connection, establishing an earth connection is essential.

3
Safety
WARNING!
• During operation, avoid touching any parts of the inverter other than the DC switch
and LCD panel.
• Never connect or disconnect the AC and DC connector while the inverter is running.
• Prior to conducting any maintenance, turn off the AC and DC power and disconnect
them from the inverter. Wait for 5 minutes to fully discharge the energy.
WARNING!
Potential danger of scalding due to the hot enclosure of the inverter
• Avoid touching the inverter while it is running, as it becomes hot during operation
and may cause personal injuries.
WARNING!
• When handling the battery, carefully follow all safety instructions provided in
the battery manual. The battery used with the inverter must meet the specified
requirements of the series inverter.
CAUTION!
• Make sure that children are supervised to prevent them from playing with the device.
• Pay attention to the weight of the inverter and handle it properly to avoid personal
injuries.
• Use insulated tools when installing the device, and always wear personal protective
equipment during installation and maintenance.
NOTICE!
• If an external Residual Current Device (RCD) is required by local regulations, verify
the type of RCD required. It is recommended to use a Type-A RCD with a rating of
300 mA unless a lower value is required by the specific local electric codes. When
zrequired by local regulations, the use of an RCD type B is permitted.
• Keep all product labels and the nameplate on the inverter clearly visible and well-
maintained.
1.2.3 Safety Instructions of Utility Grid
NOTICE!
• Only connect the inverter to the grid with the permission of the local utility grid
company.

4
2 Product Overview
2.1 System Description
The X3-ULTRA series is a versatile inverter that includes inversion, solar charging, and
battery charging, etc. It greatly meets the requirements of solar-powered roofs and
supports various intelligent solutions such as load management, wireless metering, dual
battery terminals, microgrids, etc., to achieve efficient and economical energy utilization.
The X3-ULTRA series can be used with different capacities of SolaX battery.
X3-ULTRA series (the device covered in this manual)
The X3-ULTRA series inverter manages battery and system energy.
PV modules
PV panel works in MPPT mode. The maximum number of PV string per MPPT
tracker is two for 15 kW, 19.9 kW and 20 kW inverter and three for 25 kW and 30
kW inverter.
Battery
The series inverter should be coupled a lithium-ion battery. The battery
communicates with the inverter via BMS and must comply with the specifications
of the regulations.
Meter/CT
The meter/CT is used by the inverter for import / export or consumption
readings, and manages the battery charge / discharge accordingly for smart
energy management applications. The X3-ULTRA series inverter supports wireless
meter solution.
Adapter Box (supported)
With SolaX Adapter Box, you can connect the smart grid heat pump to the energy
storage systems, realizing direct control of the heat pump through inverter. Please
refer to "14.2 Adapter Box Application" for specific wiring and setting.
Datahub (supported)
SolaX DataHub 1000 is a professional device that helps monitor and manage
your site with multiple inverters. Its power control functions enable the system
to comply with local grids. Please refer to "14.4 Datahub Application" for specific
wiring and setting.
EV Charger (supported)
X3-ULTRA series inverter can communicate with SolaX EV-Charger to form an
intelligent photovoltaic, storage and EV charging energy system, thus maximizing
the utilization of photovoltaic energy. Please refer to "14.3 EV-Charger
Application" for specific wiring and setting.

5
Product Overview
Generator (supported)
The generator guarantees a reliable supply in industrial plants, backup systems
and off-grid communities. SolaX PV-Genset solution ensures optimum interaction
between the photovoltaics and diesel generator, which saves fuel, lowers
energy costs and ensures a stable and reliable power supply. Please refer to "14.1
Generator Application" for specific wiring and settng.
Grid
400 V / 230 V and 380 V / 220 V grid are supported.
SolaX Cloud
SolaX Cloud is an intelligent, multifunctional monitoring platform that can be
accessed either remotely or through a hard wired connection. With the SolaX
Cloud, the operators and installers can always view key and up to date data.
System Overview
S TAT
PV modules
X3-ULTRA
Battery 1
Critical loads PV inverter
PV modules
Normal loads
SolaX Cloud
Grid
Wireless meter
Generator
CT
Adapter BoxCharger
AC DC Cloud Communication
Dongle
ATS
Receiver for
wireless meter
Battery 2 Datahub
Transmitter for
wireless meter
Control
Figure 2-1 System overview diagram

6
Product Overview
2.2 Supported Power Grid
There are different ways of wiring for different grid systems. TT / TN-S / TN-C-S are shown
as below:
L1
L2
L3
L1 L2 L3 PE
Inverter
N
N
400 V
400 V
230 V
1.L-N: 230 V
L-L: 400 V
2.L-N: 220 V
L-L: 380 V
230 V 230 V 400 V
Figure 2-2 Supported power grid-TT
L1
L2
L3
N
PE
L1 L2 L3 PEN
Inverter
1.L-N: 230 V
L-L: 400 V
2.L-N: 220 V
L-L: 380 V
400 V
400 V
230 V 230 V 230 V 400 V
Figure 2-3 Supported power grid-TN-S
1.L-N: 230 V
L-L: 400 V
2.L-N: 220 V
L-L: 380 V
L1
L2
L3
L1 L2 L3 PE N
N
PE
Inverter
400 V
400 V
230 V 230 V 230 V 400 V
Figure 2-4 Supported power grid-TN-C-S

7
Product Overview
2.3 Appearance
Nameplate
DC switch Electrical
connection area
LCD panel
Figure 2-5 Apprearance
Table 2-1 Description of appearance
Item Description
Nameplate Nameplate clearly identifies the device type, serial number, specific
DC/AC parameters, certification, etc.
LCD panel
Including screen, indicators and keys.
Screen displays the information; indicators indicate the status of
inverter. Keys are used to perform the parameter setting.
DC switch Disconnect the DC circuit when necessary.
Electrical
connection area
Including PV terminals, battery terminals, AC terminals,
communication terminals, etc.

8
Product Overview
2.4 Symbols on the Label and Inverter
Table 2-2 Description of symbols
Symbol Description
CE mark.
The inverter complies with the requirements of the applicable CE
guidelines.
TUV certified.
UKCA mark.
The inverter complies with the requirements of the applicable UKCA
guidelines.
RCM mark.
The inverter complies with the requirements of the applicable RCM
guidelines.
Additional grounding point
Beware of hot surface.
Do not touch a running inverter, as the inverter becomes hot during
operation!
Risk of electric shock.
High voltage exists after the inverter is powered on!
Risk of danger.
Potential hazards exist after the inverter is powered on!
Observe enclosed documentation.
The inverter can not be disposed together with the household waste.
Do not operate this inverter until it is isolated from battery, mains and on-
site PV generation source.
Danger to life due to high voltage.
Residual voltage exists after the inverter is powered off, which needs 5
minutes to fully discharge. Wait 5 min before attempting any service.

9
Product Overview
2.5 Working Principle
2.5.1 Circuit Diagram
The inverter is equipped with multi-channel MPPT for DC input to ensure maximum power
even under different photovoltaic input conditions. The inverter unit converts DC into
AC that meets the requirements of the power grid and feeds it into the power grid. The
lightning arrester at AC / DC side realizes the function of surge protection. The principle
design of inverter is shown in the figure below:
PV EMI
Filter
MPPT 1
MPPT 2
MPPT 3
DC Bus
Inverter
Circuit
DC/AC
INV EMI
Filter
DC SPD
BAT 1
EMI
Filter
BAT 1
Circuit
BAT2
EMI
Filter
BAT 2
Circuit
DC Switch
AC SPD
PV1+
PV1-
PV2+
PV2-
PV3+
PV3-
BAT1+
BAT1-
BAT2+
BAT2-
EPS L1
EPS L2
EPS L3
EPS N
Grid L1
Grid L2
Grid L3
Grid N
Figure 2-6 Circuit Diagram for X3-ULTRA series inverter
NOTICE!
• MPPT 3 is available for 25 kW and 30 kW inverter.

10
Product Overview
2.5.2 Application Schemes
…
N
R
S
T
……
……
RPE
N
S T R
N
STPE
+-
+-
Inverter
Battery 1 Battery 2
Distribution box
N-BAR for
EPS loads
N-BAR for loads
Loads Loads
Breaker
Breaker
E-BAR
RCD
Breaker
CT
Main Breaker
Grid
GridEPSBAT2BAT1PV COM
BMS1 BMS2Meter/
CT
Figure 2-7 Partial home backup for Europe
…
N
R
S
T
…
…
RPE
N
S T R
N
STPE
+-
+-
Inverter
Battery 1 Battery 2
N-BAR
Loads
Breaker
E-BAR
RCD
Breaker
CT
Main Breaker
Grid
Grid
EPS
BAT2
BAT1PV COM
BMS1 BMS2Meter/
CT
Figure 2-8 Whole home backup for Europe

11
Product Overview
…
N
R
S
T
……
……
RPE
N
S T R
N
STPE
+-
+-
Inverter
Battery 1 Battery 2
Distribution box
N-BAR for
EPS loads
N-BAR for loads
Loads Loads
Breaker
Breaker
E-BAR
RCD
Breaker
CT
Main Breaker
Grid
Grid
EPS
BAT2
BAT1PV COM
BMS1 BMS2Meter/
CT
Figure 2-9 Partial home backup for Australia
…
N
R
S
T
…
…
RPE
N
S T R
N
STPE
+-
+-
Inverter
Battery 1 Battery 2
N-BAR
Loads
Breaker
E-BAR
RCD
Breaker
CT
Main Breaker
Grid
Grid
EPS
BAT2
BAT1PV COM
BMS1 BMS2 Meter/
CT
Figure 2-10 Whole home backup for Australia

12
Product Overview
2.6 Working State
The series inverter has Waiting, Checking, Normal, EPS Checking, EPS, Fault, Idle and
Standby state.
Table 2-3 Description of working state
State Description
Waiting The inverter is waiting for the following two conditions to be met
in order to enter the Checking state.
Checking • The inverter is checking for conditions to enter Normal state.
Normal • The inverter is working normally.
EPS Checking • The inverter is checking for conditions to enter EPS state.
EPS • The inverter is working in off-grid state.
Fault • The inverter detects error occured and prompts error code.
Idle • The the battery SOC reaches the minimum SOC and there is no
sufficient PV input voltage, etc.
Unusual Idle • The battery needs to be charged but PV and grid power are not
allowed to charge the battery
Standby
• A standby state when the power of load is extremely low and
there is no sufficient PV input voltage, or a state when the battery
SOC is more 10% and there is no sufficient PV input voltage.
• In this state, it detects PV connection, load power, etc to
determine whether to exit Standby state and enter Normal state.