FoxESS S700-G2 User manual

User Manual
This guide describes how to use the inverter. In order to prevent improper
operation before use, please carefully read this manual.
The user manual version is updated frequently, the latest version can be
downloaded from the official website.
S Series (G2)

Table of Contents
1. Important Notes .................................................................................................................................................... 1
1.1 Scope ............................................................................................................................................................. 1
1.2 Target Group .................................................................................................................................................. 1
1.3 Symbols Used ................................................................................................................................................ 1
1.4 Symbols Explanation ......................................................................................................................................1
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. About Product .......................................................................................................................................................5
3.1 About S Series (G2) Inverter .......................................................................................................................... 5
3.2 Basic Features ............................................................................................................................................... 5
3.3 Terminals Introduction .................................................................................................................................... 6
3.4 Dimensions .....................................................................................................................................................6
4. Technical Data ...................................................................................................................................................... 7
4.1 DC Input ......................................................................................................................................................... 7
4.2 AC Output .......................................................................................................................................................7
4.3 Efficiency, Safety and Protection ....................................................................................................................8
4.4 General Data .................................................................................................................................................. 9
5. Installation .......................................................................................................................................................... 10
5.1 Packing List .................................................................................................................................................. 10
5.2 Preparation ...................................................................................................................................................10
5.3 Installation Space Required ..........................................................................................................................11
5.4 Tools Required ..............................................................................................................................................11
5.5 Installation Steps .......................................................................................................................................... 11
5.6 Wiring Steps ................................................................................................................................................. 12
5.7 Earth Connection ..........................................................................................................................................15
5.8 Communication Device Installation (Optional) ............................................................................................. 15
5.9 Inverter Start-Up ...........................................................................................................................................19
5.10 Inverter Switch Off ......................................................................................................................................20
6. Operation ............................................................................................................................................................20
6.1 Control Panel ................................................................................................................................................20
6.2 Function Tree ............................................................................................................................................... 21
7. Firmware Upgrading ........................................................................................................................................... 22
8. Maintenance ....................................................................................................................................................... 23
8.1 Alarm List ......................................................................................................................................................23
8.2 Troubleshooting ............................................................................................................................................24
8.3 Routine Maintenance ................................................................................................................................... 25
9. Decommissioning ............................................................................................................................................... 26
9.1 Dismantling the Inverter ............................................................................................................................... 26
9.2 Packaging .....................................................................................................................................................26
9.3 Storage and Transportation ..........................................................................................................................26

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1. Important Notes
1.1 Scope
This manual describes the assembly, installation, commissioning, maintenance and troubleshooting
of the following model(s) of Fox ESS products:
S Series (G2):
S700-G2 S1000-G2 S1500-G2 S2000-G2
S2500-G2 S3000-G2 S3300-G2
1.2 Target Group
This manual is for qualified personnel only. The tasks described in this manual will need to be
performed by professional, suitably qualified technicians 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.
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.
This mark indicates compound UK product safety certification requirements.
Beware of hot surface. The inverter can become hot during operation. Avoid contact
during operation.

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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 or the DC lid.
Read the manual.
Product should not be disposed as household waste.
PE conductor terminal.
2. Safety
2.1 Appropriate Usage
S Series (G2) inverter is designed and tested in accordance with international safety requirements.
However, certain safety precautions must be taken 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 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.

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- 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
PV System Residual Current Factors
- In every PV installation, several elements contribute to the current leakage to protective earth (PE).
these elements can be divided into two main types.
- Capacitive discharge current - Discharge current is generated mainly by the parasitic capacitance of
the PV modules to PE. The module type, the environmental conditions (rain, humidity) and even the
distance of the modules from the roof can effect the discharge current. Other factors that may
contribute to the parasitic capacitance are the inverter’s internal capacitance to PE and external
protection elements such as lighting protection.
- During operation, the DC bus is connected to the alternating current grid via the inverter. Thus, a
portion of the alternating voltage amplitude arrives at the DC bus. The fluctuating voltage constantly
changes the charge state of the parasitic PV capacitor (i.e capacitance to PE). This is associated
with a displacement current, which is proportional to the capacitance and the applied voltage
amplitude.
- Residual current - if there is a fault, such as defective insulation, where an energized cable comes
into contact with a grounded person, an additional current flows, known as a residual current.
Residual Current Device (RCD)
- All Fox ESS inverters incorporate a certified internal RCD (Residual Current Device) to protect
against possible electrocution in case of a malfunction of the PV array, cables or inverter (DC). The
RCD in the Fox ESS inverter can detect leakage on the DC side. There are 2 trip thresholds for the
RCD as required by the DIN VDE 0126-1-1 standard. A low threshold is used to protect against
rapid changes in leakage typical of direct contact by people. A higher threshold is used for slowly
rising leakage currents, to limit the current in grounding conductors for the safety. The default value
for higher speed personal protection is 30mA, and 300mA per unit for lower speed fire safety.
Installation and Selection of an External RCD device
- An external RCD is required in some countries. The installer must check which type of RCD is
required by the specific local electric codes. Installation of an RCD must always be conducted in
accordance with local codes and standards. Fox ESS recommends the use of a type-A RCD.
Unless a lower value is required by the specific local electric codes, Fox ESS suggests an RCD
value between 100mA and 300mA.
- In installations where the local electric code requires an RCD with a lower leakage setting, the
discharge current might result in nuisance tripping of the external RCD. The following steps are
recommended to avoid nuisance tripping of the external RCD:
1. Selecting the appropriate RCD is important for correct operation of the installation. An RCD with a
rating of 30mA may actually trip at a leakage as 15mA (according to IEC 61008). High quality RCDs will

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typically trip at a value closer to their rating.
2. Configure the trip current of the inverter’ internal RCD to a lower value than the trip current of the
external RCD. The internal RCD will trip if the current is higher than the allowed current, but because the
internal inverter RCD automatically resets when the residual currents are low it saves the manual reset.
2.3 Surge Protection Devices (SPDs) for PV Installation
WARNING!
Over-voltage protection with surge arresters should be provided when the PV power system is
installed. The grid connected inverter is not fitted with SPDs in both PV input side and mains side.
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.
Installation of SPDs to protect the inverter against mechanical damage and excessive stress include
a surge arrester in case of a building with external lightning protection system (LPS) when
separation distance is kept. To protect the DC system, surge suppression device (SPD type2) should
be fitted at the inverter end of the DC cabling and at the array located between the inverter and the
PV generator, 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.
To protect the AC system, surge suppression devices (SPD type2) should be fitted at the main
incoming point of AC supply (at the consumer’s cutout), located between the inverter and the
meter/distribution system; SPD (test impulse D1) for signal line according to EN 61632-1. All DC
cables should be installed to provide as short a run as possible, and positive and negative cables of
the string or main DC supply should be bundled together.
Avoiding the creation of loops in the system. This requirement for short runs and bundling includes
any associated earth bundling conductors. Spark gap devices are not suitable to be used in DC
circuits once conducting; they won’t stop conducting until the voltage across their terminals is
typically below 30 volts.

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3. About Product
3.1 About S Series (G2) Inverter
S Series (G2) inverters cover 0.7kW systems up to 3.3kW and are integrated with 1 MPP tracker
with high efficiency and reliability.
3.2 Basic Features
-Advanced DSP control technology.
-Utilizes the latest high-efficiency power component.
-Optimal MPPT technology.
-Wide MPPT input range.
-Advanced anti-islanding solutions.
-IP65 protection level.
-Max. Efficiency up to 97.4%. EU efficiency up to 96.8%.
-Safety & Reliability: Transformerless design with software and hardware protection.
-Export limitation (CT/Meter/ESTOP).
-Power factor regulation. Friendly HMI.
-LED status indications.
-LCD display technical data, human-machine interaction through touch key.
-PC remote control.

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3.3 Terminals Introduction
Item
Description
A
DC Switch (Optional)
B
PV
C
COM
D
Waterproof Lock Valve
E
WiFi/GPRS/4G/USB
F
Ground Screw
G
AC Connector
Note: Only authorized personnel are permitted to set the connection.
3.4 Dimensions
For S Series (G2):

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4. Technical Data
4.1 DC Input
Model
S700-G2
S1000-G2
S1500-G2
S2000-G2
S2500-G2
S3000-G2
S3300-G2
Max.
recommended DC
power [W]
1050
1500
2250
3000
3750
4500
4950
Max. DC voltage
[V]
500
500
500
500
500
500
500
Nominal DC
operating
voltage[V]
360
360
360
360
360
360
360
MPPT voltage
range [V]
50-480
50-480
50-480
50-480
50-480
50-480
50-480
MPPT voltage
range @ full load
[V]
80-450
110-450
160-450
210-450
240-450
280-450
300-450
Max. input current
[A]
14
Max. short circuit
current [A]
18
Start output
voltage [V]
60
No. of MPP
trackers
1
Strings per MPP
tracker
1
DC switch
Optional
Max. Inverter
backfeed current
to the array
0
4.2 AC Output
Model
S700-G2
S1000-G2
S1500-G2
S2000-G2
S2500-G2
S3000-G2
S3300-G2
Rated output
power [W]
700
1000
1500
2000
2500
3000
3300
Max. apparent AC
power [VA]
800
1100
1650
2200
2750
3300
3300
Rated grid voltage
and range [V]
220/230/240

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4.3 Efficiency, Safety and Protection
Rated AC
frequency and
range [Hz]
50/60
AC nominal
current [A]
3.0
4.3
6.5
8.7
10.9
13.0
14.3
Max. output fault
current [A]
31.6
Maximum output
over current
protection [A]
3.5
4.8
7.2
9.6
12.0
14.3
14.3
THD
<3%
Displacement
power factor
1 (Adjustable from 0.8 leading to 0.8 lagging)
Feed in phase
Single-phase
Over voltage
category
PV: OVC II Mains: OVC III
Model
S700-G2
S1000-G2
S1500-G2
S2000-G2
S2500-G2
S3000-G2
S3300-G2
Max. MPPT efficiency
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
99.00%
Euro efficiency
96.50%
96.50%
96.50%
96.80%
96.80%
96.80%
96.80%
Max. efficiency
97.20%
97.20%
97.30%
97.40%
97.40%
97.40%
97.40%
Safety & 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
III (AC) , II (PV)
Surge Protection
DC/AC : Type II (Optional)
Temperature
Protection
YES
AFCI Protection
Optional
Integrated DC
SwitchIntegrated DC
Switch
Optional

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4.4 General Data
Model
S700-G2
S1000-G2
S1500-G2
S2000-G2
S2500-G2
S3000-G2
S3300-G2
Dimensions (W*H*D)
[mm]
290*220*116mm
Weight
5.4kg
Cooling Method
Natural Convection
Topology
Non-isolated
Noise Emission
(typical)
<30 dB
Max. Operating
Altitude
3000 m (>2000m Derating)
Operating
Temperature Range
-25°C ~ 60°C
Humidity
0 ~ 100% ( No Condensation )
Protection Degree
IP65
Internal Consumption
at Night
＜1W
Monitoring Module:
WIFI / GPRS
Optional
Communication
RS485, Meter, CT, ISO alarm
Display
LCD, Touch Key, App, Website

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5. Installation
5.1 Packing List
Please un-pack the box, check and make sure you received all items as listed below before installation
(excluding optional items):
5.2 Preparation
- Please refer to the Technical Data to make sure the environmental conditions fit the inverter’s
requirements (degree of protection, temperature, humidity, altitude, etc.)
- Please avoid direct sunlight, rain exposure and snow build-up during installation and operation.
- To avoid overheating, always make sure the air flow around the inverter is not blocked.
- Do not install in places where gas or flammable substances may be present.
- Avoid electromagnetic interference that can compromise the correct operation of electronic
equipment.
- The slope of the wall should be within ±5°.
F G H I J
K L M N O
A B C D E
Object
Quantity
Description
Object
Quantity
Description
A
1
Inverter
I
1
Set screw
B
1
Bracket
J
1
Communication connection
C
2
DC connector (F/M)
K
1
Quick installation guide
D
1
AC connector
L
1
WiFi/LAN/GPRS (Optional)
E
3
Expansion tube
M
1
Unlock tool
F
3
Expansion screw
N
1
CT (Optional)
G
2
DC pin contact
(1*positive, 1*negative)
O
1
Meter (Optional)
H
1
Earth terminal

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5.3 Installation Space Required
5.4 Tools Required
- Manual wrench;
- Electric drill (drill bit set 8mm);
- Crimping pliers;
- Stripping pliers;
- Screwdriver.
5.5 Installation Steps
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 3 holes from bracket.
• Drill holes with electric drill, make sure the holes are at least 50mm deep, and then tighten the
expansion tubes.
Position
Min Size
Left
300mm(11.8in)
Right
300mm(11.8in)
Top
300mm(11.8in)
Bottom
300mm(11.8in)
Front
300mm(11.8in)

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• Insert the expansion tubes into the holes and tighten them. Install the bracket with the expansion
screws.
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 fixed with the 2 grooves from bracket properly.
5.6 Wiring Steps
Step 1: PV String Connection
S Series (G2) inverters can be connected with 1-string of PV modules. Please select suitable PV
modules with high reliability and quality. Open circuit voltage of module array connected should be less
than 500V, 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.
• 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
S Series (G2) inverters are designed for single-phase grid. Voltage range is 220/230/240V;
frequency is 50/60Hz. Other technical requests should comply with the requirement of the local
public grid.
Model
S700-G2
S1000-G2
S1500-G2
S2000-G2
S2500-G2
S3000-G2
S3300-G2
Cable
2.5mm²
2.5 mm²
2.5mm²
4mm²
4mm²
4mm²
4mm²
Micro-Breaker
16A
16A
16A
25A
25A
25A
25A
Note: A micro-breaker for max output overcurrent protection device shall be installed between inverter
and grid, and the current of the protection device is referred to the table above, any load SHOULD NOT

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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.
- Hold middle part of the female insert, rotate the back shell to loosen it and detach it from
female inset.
- Remove the cable nut (with rubber insert) from the back shell.
• Slide the cable nut and then the back shell onto the cable.
• Push the threaded sleeve into the socket, tighten up the cap on the terminal.
L: Brown/Red Wire
N: Blue/Black Wire
PE: Yellow & Green Wire
Note: Please refer to local cable type and color for actual
installation.

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• Push the threaded sleeve to connection terminal until both are locked tightly on the inverter.
• Remove the AC connector, press the bayonet out of the slot with a small screwdriver or the unlock
tool and pull it out, or unscrew the threaded sleeve, then pull it out.
5.7 Earth Connection
Screw the ground screw with screwdriver as shown below:
5.8 Communication Device Installation (Optional)
This S Series (G2) 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/LAN/GPRS (optional)
The inverter has an interface for WiFi/LAN/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/LAN/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/LAN/GPRS device into “WiFi/LAN/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

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refer to the WiFi product manual for more details).
4. Set-up the site account on the Fox ESS monitoring platform (please refer to the monitoring user
manual for more details).
• CT (optional)
This inverter has an integrated export management function. To enable this function, a power meter or
CT must be installed. The CT should be clamped on the main live line of the grid side. The arrow on the
CT should be pointing towards the grid. The white cable connects to CT+, and the black cable connects
to CT-.
Export limitation setting:
Short press the touch key to switch display or make the number+1. Long press the touch key to confirm
your setting.
Note!
For a precise reading and control of power, a meter can be used instead of a CT. If the
CT is fitted in the wrong orientation, anti-backflow function will fail.
• RS485/Meter
- RS485
RS485 is a standard communication interface which can transmit the real time data from inverter
to PC or other monitoring devices.

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- Meter (optional)
The inverter has integrated export limitation functionality. To use this function, a power meter or a
CT must be installed. For Meter installation, please install it on the grid side.
Export limitation setting:
Short press the touch key to switch display or make the Value+1. Long press the touch key to confirm
your setting.
Manufacturer of electricity meters: EASTRON
Manufacturer of electricity meters: CHINT