SolaX Power X3-ULTRA User manual

Version 3.0
eManual in the QR
code or at http://
kb.solaxpower.com/
X3-ULTRA
User Manual
15 kW / 19.9 kW / 20 kW / 25 kW / 30 kW
www.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-15KP
• X3-ULT-19.9K (Applicable to Italy)
• X3-ULT-20K
• X3-ULT-20KP
• 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 Appearance .........................................................................................................................4
2.3 Supported Power Grid .....................................................................................................5
2.4 Symbols on the Label and Inverter...............................................................................6
2.5 Working Principle...............................................................................................................7
2.5.1 Circuit Diagram.....................................................................................................7
2.5.2 Application Schemes ..........................................................................................8
2.6 Working State ......................................................................................................................10
2.7 Working Mode ....................................................................................................................11
2.7.1 Self-use Mode (Priority: Loads > Battery > Grid) .........................................11
2.7.2 Feed-in Priority (Priority: Loads > Grid > Battery) .......................................13
2.7.3 Backup Mode (Priority: Loads > Battery > Grid) ..........................................14
2.7.4 Peak Shaving Mode ............................................................................................16
2.7.5 TOU Mode..............................................................................................................17
2.7.6 EPS Mode (Priority: Loads > Battery) ..............................................................18
2.7.7 Manual Mode.........................................................................................................19
2.7.8 Export Control Function ....................................................................................19
3 System Overview......................................................................................21
4 Transportation and Storage ...................................................................23
5 Preparation before Installation..............................................................24
5.1 Selection of Installation Location .................................................................................24
5.1.1 Environment Requirement ................................................................................24
5.1.2 Installation Carrier Requirement......................................................................25
5.1.3 Clearance Requirement .....................................................................................26
5.2 Tools Requirement............................................................................................................27
5.3 Additionally Required Materials .....................................................................................28

V
6 Unpacking and Inspection .....................................................................29
6.1 Unpacking............................................................................................................................29
6.2 Scope of Delivery...............................................................................................................30
7 Mechanical Installation ...........................................................................32
7.1 Dimensions for mounting...............................................................................................33
7.2 Installation procedures.....................................................................................................34
8 Electrical Connection .............................................................................37
8.1 Terminals of Inverter .........................................................................................................37
8.2 PE Connection ...................................................................................................................38
8.3 AC Connection...................................................................................................................41
8.4 PV Connection ...................................................................................................................45
8.5 Battery Power Cable Connection.................................................................................49
8.6 COM 1 Communication Connection ..........................................................................56
8.6.1 Pin Assignment of COM 1 Terminal ................................................................56
8.6.2 Parallel Communication Connection ............................................................57
8.6.3 BMS Communication Connection .................................................................60
8.6.4 RS485 Communication Connection .............................................................62
8.6.5 DRM Connection (Applicable to AS/NZS 4777) ..........................................63
8.7 COM 2 Communication Connection..........................................................................65
8.7.1 Pin Assignment of COM 2 Terminal................................................................65
8.7.2 Meter/CT Connection.........................................................................................66
8.7.3 Ripple Control Communication Connection ..............................................71
8.7.4 DIO Communication Connection..................................................................72
8.8 Monitoring Connection...................................................................................................74
9 System Commissioning..........................................................................77
9.1 Checking before Power-on ............................................................................................77
9.2 Powering on the System..................................................................................................77
9.3 Operation of lockable DC Switch .................................................................................78
10 Operation on LCD....................................................................................80
10.1 Introduction of Control Panel........................................................................................80
10.2 Introduction of Menu Interface.....................................................................................81
10.3 System ON/OFF..................................................................................................................84
10.4 Mode Select ........................................................................................................................84
10.5 System Status ......................................................................................................................84
10.6 History Data.........................................................................................................................86
10.7 Setting ...................................................................................................................................88
10.7.1 User Setting............................................................................................................88

VI
10.7.2 Advanced Setting .................................................................................................96
10.8 About.....................................................................................................................................110
11 Operation on SolaX Cloud App.............................................................112
11.1 Introduction of SolaX Cloud App..................................................................................112
11.2 Downloading and installing App...................................................................................112
11.2.1 Downloading and installing App......................................................................112
11.3 Operation Guide on SolaXCloud Web ........................................................................113
12 Troubleshooting and Maintenance ......................................................114
12.1 Power off..............................................................................................................................114
12.2 Troubleshooting.................................................................................................................114
12.3 Maintenance........................................................................................................................123
12.3.1 Maintenance routines ........................................................................................123
12.3.2 Replacement of Fans...........................................................................................124
12.3.3 Upgrading Firmware............................................................................................125
13 Decommissioning....................................................................................127
13.1 Disassembling the Inverter ............................................................................................127
13.2 Packing the Inverter ..........................................................................................................130
13.3 Disposing of the Inverter .................................................................................................130
14 Technical Data ..........................................................................................131
15 Appendix ...................................................................................................135
15.1 Generator Application......................................................................................................135
15.2 Adapter Box Application ..................................................................................................140
15.3 EV-Charger Application ...................................................................................................143
15.4 Datahub Application .........................................................................................................146
15.5 Micro-grid Application .....................................................................................................149
15.6 Parallel Application............................................................................................................155

1
1 Safety
1.1 General Safety
The series inverter has been meticulously designed and thoroughly tested to comply
with the 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 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
required 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 the energy storage inverter that supports grid connection of
photovoltaic system. 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.
2.2 Appearance
Nameplate
DC switch Electrical
connection area
LCD panel
Figure 2-1 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.

5
Product Overview
2.3 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 400 V
1.L-N: 230 V; L-L: 400 V 2.L-N: 220 V; L-L: 380 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 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 400 V
PEN
Figure 2-4 Supported power grid-TN-C-S

6
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.
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.

7
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
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 2-5 Circuit Diagram for X3-ULTRA series inverter
NOTICE!
• MPPT 3 is available for X3-ULT-15KP, 20KP, 25K and 30K inverter.

8
Product Overview
2.5.2 Application Schemes
…
…
L1
N
L3
L2
PE
L1
N
L3
L2
PE
CT
RCD
RCD
Inverter
Battery 1
Battery 2 Distribution box
N-BAR for loads
Loads
Breaker
Breaker
E-BAR
Main Breaker
Grid
Grid
EPS
Breaker
Figure 2-6 Whole home backup for most countries
……
…
L1
N
L3
L2
PE
L1
N
L3
L2
PE
CT
RCD
RCD RCD
Inverter
Battery 1
Battery 2
Loads
Breaker
E-BAR
Breaker Main Breaker
Grid
Grid
EPS
Breaker
Loads
N-BAR for EPS loads N-BAR for loads
Distribution box
Breaker
Figure 2-7 Partial home backup for most countries

9
Product Overview
…
Inverter
Battery 1
Battery 2 Distribution box
N-BAR for loads
Loads
Breaker
E-BAR
Breaker Main Breaker
Grid
Grid
EPS
L1
N
L3
L2
PE
L1
N
L3
L2
PE
CT
RCD
RCD
Breaker
Figure 2-8 Whole home backup for Australia
…
Inverter
Battery 1
Battery 2
Breaker
E-BAR
Breaker Main Breaker
Grid
Grid
EPS
L1
N
L3
L2
PE
L1
N
L3
L2
PE
CT
RCD
RCD RCD
Loads Loads
Distribution box
N-BAR for loadsN-BAR for EPS loads
Breaker
Breaker
Figure 2-9 Partial home backup for Australia

10
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：
• The adequate photovoltaic input voltage.
• The AC side voltage and frequency meet the grid requirements
specified by the grid regulations.
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 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.
NOTICE!
• When the inverter is in an Idle state, you can reset the work mode, the Min SOC and
the charging periods through the inverter LCD or the SolaX APP to charge the battery
to the Min SOC in the charging periods and then awaken the inverter. Please make
sure that the actual battery SOC - the modified Min SOC ≥ 2% under a specific work
mode, so that other modifications are effective. When the current system time is
within the new charing periods you reset, the battery begins charing.

11
Product Overview
2.7 Working Mode
Six working modes are available for you to choose in on-grid status, i.e Self use, Feed-
in priority, Backup, Peak shaving, TOU and Manual. You can choose the working modes
according to your lifestyle and environment.
When the power supply from the electric power company is stopped due to a power
outage, it automatically switches to EPS mode and connects to the distribution board for a
specific load, thereby providing power to important electrical appliances.
For how to set the working mode, please refer to the section "10.7.1 User Setting".
2.7.1 Self-use Mode (Priority: Loads > Battery > Grid)
The self-use mode is suitable for areas with low feed-in subsidies and high electricity
prices. The power of PV will supply the loads first, and the surplus power will charge the
battery, then the remaining power will feed into the grid.
Chag rin g Stan db y
Disc harging
Pu rchase electricity Sell electricity
Self use
Self-use Mode
(Assum in g p ea k po w er f rom 7 : 00 to 23: 00)
Id ea : Ta k e less electricity from th e g rid
Allowed d isch a rg ing p erio dForced ch a rg in g time
7:0 0
PV an d b attery po w er th e lo a d
Charge th e b attery
PV p owers th e lo ad
Load p ower cu rv e
18 :00 23: 00
Oth erOth er
Power
Time Line
Chag rin g Stan db y Discha rg in g Oth er
Self use
Purc hase
ele c tric ity
Battery
status
Battery
SO C
Pu rchase
status
Time
settin g
Th e g rid su pp lies p o wer to th e
load an d ch a rg es th e b a tter y .
PV an d b attery
pow er load
Su rp lu s w ill b e
so ld to the utility
PV input power
Figure 2-10 Self-use mode
NOTICE!
• Set the export control according to the safety code.
Table 2-5 Description of self-use mode
Time period Inverter working status
Forced charging
period
• Charge the battery firstly untill the battery SOC reaches the
specified Charge battery to value. You can configure the
inverter to either draw power from the grid or not.

12
Product Overview
Allowed discharging
period
PV is sufficient
(PV →load →battery →grid)
• The power generated from PV prioritizes supplying the load.
Any excess power is then directed towards charging the
battery, and if there is still surplus electricity, it can be sold to
the grid. In the event that the local utility restricts the sale of
electricity to the grid, the Export Control can be set to limit the
output to the grid. For specific settings, please refer to "Setting
Export Control".
PV is insufficient
(PV+battery →load)
• The battery discharges power to the load, and once its capacity
reaches Min SOC, it automatically ceases discharging.
Note:
Charge battery to: The battery SOC charged from grid. 30% by default, the settable range
is 10%~100%.
Min SOC: Minimum SOC of the battery under grid connection. 10% by default, the settable
range is 10%~100%.
Charge & Discharge Period
You can set two configurable working periods: forced charging period and allowed
discharging period. The interval not in the charging & discharging period belongs to other
time periods.
• Forced charging period (Default period: 00:00~00:00, closed by default)
In the forced charging period, the inverter will charge the battery first untill the battery SOC
reaches the specified Charge battery to value set in each working mode. You have the
option to configure the inverter to either draw power from the grid or not.
• Allowed discharging period (Default period: 00:00~23:59)
In the allowed discharging period, the inverter will allow the battery to discharge and
charge power in accordance with the working mode and load conditions.
• Period not set as forced charging or allowed dicharging period
In this period, the inverter will allow the battery to charge but can not discharge power.
NOTICE!
• The charging and discharging period is only applicable for self-use mode, feed-in
priority and backup mode. The priority of forced charging period is higher than all
working modes.