FoxESS T Series User manual

Table of Contents
1. Notes on this Manual.................................................................................................................... 1
1.1 Scope of Validity.................................................................................................................. 1
1.2 Target Group ....................................................................................................................... 1
1.3 Symbols Used...................................................................................................................... 1
1.4 Symbols Explanation........................................................................................................... 2
2. Safety ............................................................................................................................................ 2
2.1 Appropriate Usage .............................................................................................................. 2
2.2 PE Connection and Leakage Current................................................................................... 3
2.3 Surge protection devices (SPDs) for PV installation............................................................ 4
3. Introduction .................................................................................................................................. 5
3.1 Basic features...................................................................................................................... 5
3.2 Dimensions.......................................................................................................................... 5
3.3 Terminals of inverter........................................................................................................... 6
4. Technical Data............................................................................................................................... 7
4.1 AC output/input....................................................................Error! Bookmark not defined.
4.2 Efficiency, Safety and Protection......................................................................................... 8
4.3 General Data ....................................................................................................................... 9
5. Installation .................................................................................................................................... 9
5.1 Check for Physical Damage ................................................................................................. 9
5.2 Packing List.......................................................................................................................... 9
5.3 Mounting...........................................................................................................................10
6. Electrical Connection .................................................................................................................. 13
6.1 Wiring Steps......................................................................................................................13
6.2 Earth Connection .............................................................................................................. 16
6.3 Communication Device Installation (Optional).................................................................17
6.4 Inverter Start-Up ............................................................................................................... 19
6.5 Inverter Switch Off ............................................................................................................20
7. Operation....................................................................................................................................21
7.1Control Panel...................................................................................................................... 21
7.2 Function Tree .................................................................................................................... 22
8. Firmware Upgrading ...................................................................................................................22
9. Maintenance...............................................................................................................................24
9.1 Alarm List ..........................................................................................................................24
9.2 Troubleshooting................................................................................................................26
9.3 Routine maintenance........................................................................................................ 26
10. Decommissioning...................................................................................................................... 27
10.1 Dismantling the Inverter .................................................................................................27
10.2 Packaging ........................................................................................................................ 27
10.3 Storage and Transportation ............................................................................................ 27

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1. Notes on this Manual
1.1 Scope of Validity
This manual describes the assembly, installation, commissioning, maintenance and
troubleshooting of the following model(s) of FoxESS products:
T3, T4, T5, T6, T8, T10, T12, T15, T17, T20, T25
Note：Store this manual where it will be accessible at all times.
1.2 Target Group
This manual is for qualified electricians. The tasks described in this manual can be performed by
qualified individuals only.
1.3 Symbols Used
The following types of safety instructions and general information appear in this document as
described below:
Danger!
“Danger” indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
Warning!
“Warning” indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
Caution!
“Caution” indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
Note!
“Note” provides important tips and guidance.

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1.4 Symbols Explanation
This section explains the symbols shown on the inverter and on the type label：
Symbols
Explanation
Symbol Explanation CE mark. The inverter complies with the requirements of the
applicable CE guidelines.
Beware of hot surface. The inverter can become hot during operation. Avoid
contact during operation.
Danger of high voltages.
Danger to life due to high voltages in the inverter!
Danger.
Risk of electric shock!
Danger to life due to high voltage.
There is residual voltage in the inverter which needs 5 min to discharge.
Wait 5 min before you open the upper lid.
Read the manual
Product should not be disposed as household waste
2. Safety
2.1 Appropriate Usage
The T Series inverter is designed and tested in accordance with international safety requirements. However,
certain safety precautions must be taken into account when installing and operating this inverter. The installer
must read and follow all instructions, cautions and warnings in this installation manual.
▪All operations including transport, installation, start-up and maintenance, must be carried out by
qualified, trained personnel.
▪The electrical installation & maintenance of the inverter shall be conducted by a licensed electrician and

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shall comply with local wiring rules and regulations.
▪Before installation, check the unit to ensure it is free of any transport or handling damage, which could
affect insulation integrity or safety clearances. Choose the installation location carefully and adhere to
specified cooling requirements. Unauthorized removal of necessary protections, improper use, incorrect
installation and operation may lead to serious safety and shock hazards or equipment damage.
▪Before connecting the inverter to the power distribution grid, contact the local power distribution grid
company to get appropriate approvals. This connection must be made only by qualified technical
personnel.
▪Do not install the equipment in adverse environmental conditions such as in close proximity to
flammable or explosive substances; in a corrosive environment; where there is exposure to extreme high
or low temperatures; or where humidity is high.
▪Do not use the equipment when the safety devices do not work or are disabled.
▪Use personal protective equipment, including gloves and eye protection during the installation.
▪Inform the manufacturer about non-standard installation conditions.
▪Do not use the equipment if any operating anomalies are found. Avoid temporary repairs.
▪All repairs should be carried out using only approved spare parts, which must be installed in accordance
with their intended use and by a licensed contractor or authorized Fox-ESS service representative.
▪Liabilities arising from commercial components are delegated to their respective manufacturers.
▪Any time the inverter has been disconnected from the public network, please be extremely cautious as
some components can retain charge sufficient to create a shock hazard. Prior to touching any part of the
inverter please ensure surfaces and equipment are under touch safe temperatures and voltage
potentials before proceeding.
2.2 PE Connection and Leakage Current
-The end-use application shall monitor the protective conductor by residual current operated protective
device (RCD) with rated fault current Ifn≤280mA which will automatically disconnect from the grid in case
of a fault.
-DC differential currents are created (caused by insulation resistance and through capacities of the PV
generator). In order to prevent unwanted triggering during operation, the rated residual current of the
RCD has to be min 240mA. The device is intended to connect to a PV generator with a capacitance limit
of approx. 7500nf.
WARNING!
High leakage current! Earth connection essential before connecting supply.
-Incorrect grounding can cause physical injury, death or equipment malfunction and increase
electromagnetic interference.

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-Make sure that grounding conductor is adequately sized as required by safety regulations.
-Do not connect the ground terminals of the unit in series in case of a multiple installation. This product
can cause current with a DC component, where a residual current operated protective device (RCD) or
monitoring device (RCM) is used for protection in case of direct or indirect contact, only an RCD or RCM
of type B is allowed on the supply side of this product.
For UK
-The installation that connects the equipment to the supply terminals shall comply with the requirements
of BS 7671.
-Electrical installation of PV system shall comply with requirements of BS 7671 and IEC 60634-7-712.
-No protection settings can be altered.
-User shall ensure that the equipment is so installed, designed and operated to maintain at all times
compliance with requirements of ESQCR22(1)(a).
For AU
Electrical installation and maintenance shall be conducted by licensed electrician and shall comply with
Australia National Wiring Rules.
2.3 Surge protection devices (SPDs) for PV installation
Lightning will cause damage either from a direct strike or from surges due to a nearby strike.
Induced surges are the most likely cause of lightning damage in majority or installations, especially in rural
areas where electricity is usually provided by long overhead lines. Surges may impact on both the PV array
conduction and the AC cables leading to the building. Specialists in lightning protection should be consulted
during the end use application. Using appropriate external lightning protection, the effect of a direct lightning
strike into a building can be mitigated in a controlled way, and the lightning current can be discharged into the
ground.
Thanks to the integrated SPD on DC and AC side, it is not necessary to install external lightning protection
system on both sides. The inside integrated SPD device is SPD type 2 protection, if the voltage protection level
(VP) of the surge arresters is greater than 1100V, an additional SPD type 3 is required for surge protection for
electrical devices.

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3. Introduction
3.1 Basic features
This three-phase high performance inverter covers 3kW to 25kW. The inverter is integrated with 2
MPP trackers with high efficiency and reliability.
System advantage:
➢Advanced DSP control technology.
➢Utilizes the latest high-efficiency power components.
➢Optimal MPPT technology:
➢Two independent MPP trackers.
➢Wide MPPT input range.
➢Advanced anti-islanding solutions.
➢IP65 protection level.
➢Max. Efficiency up to 98.6%. EU efficiency up to 97.8%. THD<3%.
➢Safety & Reliability: transformerless design with software and hardware protection.
➢Export limitation (Meter/DRM0/ESTOP).
➢Power factor regulation. Friendly HMI.
➢LED status indications.
➢LCD display technical data, human-machine interaction through touch key.
➢Remote monitoring via PC or APP.
➢Upgrade through USB interface.
3.2 Dimensions

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3.3 Terminals of inverter
Item
Description
A
DC Switch (Optional)
B
PV+
C
PV-
D
WiFi / GPRS
E
USB
F
COM
G
Waterproof Lock Valve
H
AC Connector
I
Grounding Screw
Note: Only authorized personnel are permitted to set the connection.

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4. Technical Data
4.1 PV input/AC output
T-series Specifications
Model
T3
T4
T5
T6
T8
T10
T12
T15
T17
T20
T25
3000
4000
5000
6000
8000
10000
12000
15000
17000
20000
25000
INPUT
PV
Max.DC Input power
4500W
6000W
7500W
9000W
12000W
15000W
18000W
22500W
25500W
30000W
37500W
Max.DC voltage
1100V
1100V
1100V
1100V
1100V
1100V
1100V
1100V
1100V
1100V
1100V
Nominal DC operating
voltage
600V
600V
600V
600V
600V
600V
600V
600V
600V
600V
600V
Max. input current( input
A/input B)
12.5A /
12.5A
12.5A /
12.5A
12.5A /
12.5A
12.5A /
12.5A
12.5A /
12.5A
12.5A /
12.5A
12.5A /
12.5A
25A /
12.5A
25A / 25A
25A / 25A
25A / 25A
Max. short circuit current
(input A/input B)
16.25A /
16.25A
16.25A /
16.25A
16.25A /
16.25A
16.25A /
16.25A
16.25A /
16.25A
16.25A /
16.25A
16.25A /
16.25A
32.5A /
16.25A
32.5A /
32.5A
32.5A /
32.5A
32.5A /
32.5A
MPPT voltage range
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
160-850
Vdc
MPPT voltage range (full
load)
210-850
Vdc
210-850
Vdc
210-850
Vdc
250-850
Vdc
330-850
Vdc
410-850
Vdc
490-850
Vdc
410-850
Vdc
350-850
Vdc
410-850
Vdc
510-850
Vdc
Start-up voltage
180V
180V
180V
180V
180V
180V
180V
180V
180V
180V
180V
No. of MPP trackers
2
2
2
2
2
2
2
2
2
2
2
Strings per MPP tracker
1+1
1+1
1+1
1+1
1+1
1+1
1+1
2+1
2+2
2+2
2+2
Max.Inverter backfeed
current to the array (mA)
0
OUTPUT
AC
Nominal AC power
3000W
4000W
5000W
6000W
8000W
10000W
12000W
15000W
17000W
20000W
25000W
Max. apparent AC power
3300VA
4400VA
5500VA
6600VA
8800VA
11000VA
13200VA
16500VA
18700VA
22000VA
27500VA
Rated grid voltage (AC
voltage range)
3/N/PE, 400V
Rated Grid Frequency
50/60Hz , ±5Hz
Nominal AC current
4.3A
5.8 A
7.2 A
8.7 A
11.6 A
14.5 A
17.4 A
21.7 A
24.6 A
29.0 A
36.2 A
Max. AC current
4.8A
6.4 A
8.0 A
9.6 A
12.8 A
15.9 A
19.1 A
23.9 A
27.1 A
31.9 A
39.9 A
Inrush current
10.1A
13.5 A
16.9 A
20.3 A
27.1 A
33.8 A
40.6 A
50.7 A
57.5 A
67.6 A
84.5 A

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Displacement power
factor
1 (Adjustable from 0.8 leading to 0.8 lagging)
Total harmonic
distortion(THDi, @rated
output)
<3%
4.2 Efficiency, Safety and Protection
T-series Specifications
Model
T3
T4
T5
T6
T8
T10
T12
T15
T17
T20
T25
EFFICIENCY
Max. MPPT efficiency
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
Euro-efficiency
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
97.80%
Max. efficiency (@rated
voltage)
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
98.60%
PROTECTION
DC reverse-polarity
protection:
YES
Anti-Islanding protection
YES
Insulation monitoring:
YES
Residual current
monitoring:
YES
AC Short circuit
protection:
YES
AC Output over current
protection:
YES
AC Output over voltage
protection:
YES
Surge protection:
YES
Temperature protection:
YES
Integrated DC switch:
Optional
STANDARD
Safety
IEC62109-1/2
EMC
IEC 61000-6-1 / IEC 61000-6-2 / IEC 61000-6-3 / IEC61000-4-2/3/4/5/6/8
Cetification
AS4777.2-2015 / VDE-AR-N 4105 /VDE0126-1-1 / G98 / G99 / EN50549-1 / CEI 0-21
IEC62116 / IEC61727 / IEC61683

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4.3 General Data
T-series Specifications
Model
T3
T4
T5
T6
T8
T10
T12
T15
T17
T20
T25
GENERAL DATA
Dimensions (WxHxD)
427*522.5*204mm
NET Weight
29kg
Cooling concept
Convection
Forced convection
Ingress Protection
(according to IEC60529)
IP65
Topology
Transformerless
Over Voltage Category
III(AC side), II(PV side)
Noise emission (typical)
<30dB
<55dB
<75dB
Max. Operating Altitude
4000m(>3000m derating)
Operating temperature
range
-20…... +60°C (derating at +45°C)
Storage temperature range
-40…... +70°C
Humidity
0-100% (no condensation)
Self-consumption (night)
＜3W
Pollution Degree
Ⅱ
Monitoring Module
(optional)
RS485, WIFI (optional)/ GPRS (optional)
Communication
Meter, DRM, USB update, E-stop
Display
LCD screen, touch key, App,Web site
5. Installation
5.1 Check for Physical Damage
Make sure the inverter has not been damaged during transportation. If there is any visible damage,
such as cracks, please contact your dealer immediately.
5.2 Packing List
Open the package and take out the product, please check the accessories first. The packing list is
as shown as below.

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Object
Quantity
Description
Object
Quantity
Description
A
1
Inverter
H
1
Earth terminal
B
1
Bracket
I
1
Communication connector
C
2/3/4
DC connector (F/M)
J
1
Product manual
D
1
AC connector
K
1
Quick installation guide
E
5
Expansion tube
L
1
WiFi/GPRS (Optional)
F
5
Expansion screw
G
2/3/4
DC pin contact
(1*positive, 1*negative)
5.3 Mounting
➢Installation Precaution
Make sure the installation location complies with the following conditions:
•Not in direct sunlight.
•Not in areas where highly flammable materials are stored.
•Not in potentially explosive areas.

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•Not in a direct flow of cool air.
•Not near a television antenna or antenna cable.
•Not higher than altitude of 4000m above sea level.
•Not in environment of precipitation or humidity (> 95%).
•Is well ventilated.
•The ambient temperature is in the range of -20°C to +60°C.
•The slope of the wall should be within ±5°.
•The wall where the inverter is mounted should comply with the following conditions:
1. Is solid brick/concrete or a mounting surface of equivalent strength or;
2. The Inverter must be supported or strengthened if the wall's strength isn't adequate (such
as a stud wall or where the wall is covered by thick layer of decoration)
•Avoid direct sunlight, rain exposure or accumulations of snow during installation and operation.
➢Space Requirement
➢Mounting Steps
Tools required for installation.
▪Manual wrench;
▪Electric drill (drill bit set 8mm);
▪Crimping pliers;
Position
Min Size
Left
30cm
Right
30cm
Top
30cm
Bottom
30cm
Front
30cm

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▪Stripping pliers;
▪Screwdriver.
Step 1: Fix the bracket on the wall
Choose the place you want to install the inverter. Place the bracket on the wall and mark the
position of the 5 holes from bracket.
Drill holes with electric drill, make sure the holes are at least 50mm deep, and then tighten the
expansion tubes.
Insert the expansion tubes into the holes and tighten them. Install the bracket with the expansion
screws.

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Step 2: Match the inverter with wall bracket
Hang the inverter over the bracket, slightly lower the inverter, and make sure the 2 mounting bars
on the back are properly fixed with the 2 bracket grooves.
6. Electrical Connection
6.1 Wiring Steps
Step 1: PV String Connection
T series inverters can be connected with 2 strings of PV modules. Please select suitable PV modules with high
reliability and quality. Open circuit voltage of the module array connected should be less than 1100V, and operating
voltage should be within the MPPT voltage range.
Note!
Please choose a suitable external DC switch if the inverter does not have a built-in
DC switch.
Warning!
PV module voltage is very high and within a dangerous voltage range, please comply
with the electric safety rules when connecting.
Warning!
Please do not make PV positive or negative to ground！
Note!
PV modules – please ensure they are the same type, have the same output and
specifications, are aligned identically, and are tilted to the same angle. In order to save
cable and reduce DC loss, we recommend installing the inverter as near to the PV
modules as possible

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Step 2: DC Wiring
➢Turn off the DC switch.
➢Choose 12 AWG wire to connect the PV module.
➢Trim 6mm of insulation from the wire end.
➢Separate the DC connector as below.
Plug Pin contact Cable nut
➢Insert striped cable into pin contact and ensure all conductor strands are captured in the pin contact.
➢Crimp pin contact by using a crimping plier. Put the pin contact with striped cable into the corresponding
crimping pliers and crimp the contact.
➢Insert pin contact through the cable nut to assemble into back of the male or female plug. When you feel or
hear a “click” the pin contact assembly is seated correctly.
➢Unlock the DC connector
- Use the specified wrench tool.
- When separating the DC+ connector, push the tool down from the top.
- When separating the DC - connector, push the tool down from the bottom.
- Separate the connectors by hand.
➢Grid Connection
T series inverters are designed for three-phase grid. Voltage range is 220/230/240V; frequency is

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50/60Hz. Other technical requests should comply with the requirement of the local public grid.
Note: A micro-breaker should be installed between inverter and grid; any load SHOULD NOT be connected with the
inverter directly.
Step 3: AC Wiring
➢ Check the grid voltage and compare with the permitted voltage range (refer to technical data).
➢ Disconnect the circuit-breaker from all the phases and secure against re-connection.
➢ Trim the wires :
- Trim all the wires to 52.5mm and the PE wire to 55mm.
- Use the crimping pliers to trim 12mm of insulation from all wire ends as below.
➢Separate the AC plug into three parts as below.
➢Insert the sleeve assembly into the cable.
Model
T3
T4
T5
T6
T8
T10
T12
T15
T17
T20
T25
Cable
2.5~6mm²
4~6mm²
6~10mm²
10mm²
Micro-Breaker
16A
25A
40A
50A
60A

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➢Install the copper wire into the plug terminal and lock the screw.
➢Lock the lock nut and the sleeve (3~5NM), lock the sleeve and the plug (1.5~1.7NM).
➢Insert the plug assembly into the socket (inverter end) and lock each other by the coupling
twist.
6.2 Earth Connection
Screw the ground screw with screwdriver as shown below:

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6.3 Communication Device Installation (Optional)
The T Series inverter is available with multiple communication options such as WiFi, GPRS, RS485, and Meter with
an external device.
Operating information like output voltage, current, frequency, fault information, etc. can be monitored locally or
remotely via these interfaces.
➢WiFi/GPRS (Optional)
The inverter has an interface for WiFi/GPRS devices that allow this device to collect information from inverter;
including inverter working status, performance etc., and update that information to monitoring platform (the
WiFi/GPRS device is available to purchase from your local supplier).
Connection steps:
1. For GPRS device: Please insert the SIM Card (please refer to the GPRS product manual for more details).
2. Plug the WiFi/GPRS device into “WiFi/GPRS” port at the bottom of the inverter.
3. For WiFi device: Connect the WiFi with the local router and complete the WiFi configuration (please refer to
the WiFi product manual for more details).
4. Set-up the site account on the FoxESS monitoring platform (please refer to the monitoring user manual for
more details).
➢RS485/Meter