Srne HESP Series User manual

Solar hybrid inverter V1.1
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Solar Hybrid Inverter
User Manual
Product models:
HESP4840S100-H ｜ HESP4846S100-H ｜HESP4850S100-H
HESP4855S100-H ｜ HESP4860S100-H

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Important safety instructions
Please keep this manual for future use.
This manual contains all safety, installation and operating instructions for the HESP series solar hybrid
inverter.
Please read all instructions and precautions in the manual carefully before installation and use.
Non-safety voltage exists inside the solar hybrid inverter. To avoid personal injury, users shall not
disassemble the solar hybrid inverter themselves. Contact our professional maintenance personnel
if there is a need for repair.
Do not place the solar hybrid inverter within the reach of children.
Do not install the solar hybrid inverter in harsh environments such as moist, oily, flammable or
explosive, or heavily dusty areas.
The mains input and AC output are high voltage, so please do not touch the wiring terminals.
The housing of the solar hybrid inverter is hot when it is working. Do not touch it.
Do not open the terminal protective cover when the solar hybrid inverter is working.
It is recommended to attach proper fuse or circuit breaker to the outside of the solar hybrid inverter.
Always disconnect the fuse or circuit breaker near the terminals of PV array, mains and battery
before installing and adjusting the wiring of the solar hybrid inverter.
After installation, check that all wire connections are tight to avoid heat accumulation due to poor
connection, which is dangerous.
The solar hybrid inverter is off-grid. It is necessary to confirm that it is the only input device for load,
and it is forbidden to use it in parallel with other input AC power to avoid damage.

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CONTENTS
1. GENERAL INFORMATION...................................................................................................................................................................................... 4
1.1 PRODUCT OVERVIEW AND FEATURES.................................................................................................................................................................4
1.2 BASIC SYSTEM INTRODUCTION ............................................................................................................................................................................5
1.3 APPEARANCE .......................................................................................................................................................................................................6
1.4 DIMENSION DRAWING......................................................................................................................................................................................... 7
2. INSTALLATION INSTRUCTIONS............................................................................................................................................................................. 8
2.1 INSTALLATION PRECAUTIONS .............................................................................................................................................................................. 8
2.2 WIRING SPECIFICATIONS AND CIRCUIT BREAKER SELECTION ............................................................................................................................9
2.3 INSTALLATION AND WIRING ...............................................................................................................................................................................11
2.4 PARALLEL MACHINE WIRE CONNECTION ......................................................................................................................................................... 17
2.4.1 Introduction.........................................................................................................................................................................................17
2.4.2 Precautions for connecting the parallel connecting lines .......................................................................................................17
2.4.3 Schematic diagram of parallel connection in single phase ................................................................................................... 19
2.4.4 Schematic diagram of parallel connection in three phase .....................................................................................................22
3. OPERATING MODES ...............................................................................................................................................................................................27
3.1 CHARGING MODE ..............................................................................................................................................................................................27
3.2 OUTPUT MODE .................................................................................................................................................................................................. 28
4. LCD SCREEN OPERATING INSTRUCTIONS ..................................................................................................................................................... 29
4.1 OPERATION AND DISPLAY PANEL .................................................................................................................................................................... 29
4.2 OPERATION BUTTONS INTRODUCTION ............................................................................................................................................................. 29
4.3 INDICATORS INTRODUCTION ............................................................................................................................................................................. 29
4.4 LCD SCREEN INTRODUCTION .......................................................................................................................................................................... 30
4.5 SETUP PARAMETERS DESCRIPTION ..................................................................................................................................................................33
4.6 BATTERY TYPE PARAMETERS ...........................................................................................................................................................................43
5. OTHER FUNCTIONS ................................................................................................................................................................................................45
5.1 DRY CONTACT ................................................................................................................................................................................................... 45
5.2 RS485 COMMUNICATION PORT ....................................................................................................................................................................... 45
5.3 USB COMMUNICATION PORT ............................................................................................................................................................................45
5.4 CAN COMMUNICATION FUNCTION .................................................................................................................................................................... 45
5.5 PARALLEL COMMUNICATION FUNCTION (PARALLEL).......................................................................................................................................46
6. PROTECTION ............................................................................................................................................................................................................ 46
6.1 PROTECTIONS PROVIDED .................................................................................................................................................................................. 46
6.2 FAULT CODE ......................................................................................................................................................................................................48
6.3 HANDLING MEASURES FOR PART OF FAULTS ................................................................................................................................................. 52
7.TROUBLESHOOTING............................................................................................................................................................................................... 54
8. TECHNICAL PARAMETERS ...................................................................................................................................................................................55

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1. General information
1.1 Product overview and features
HESP series is a new solar hybrid inverter, which integrates solar energy storage & mains charging
energy storage and AC sine wave output. Thanks to DSP control and advanced control algorithm, it has
high response speed, high reliability and high industrial standard. Four charging modes are optional, i.e.
Only Solar, Mains Priority, Solar Priority and Mains & Solar hybrid charging; and two output modes are
available, i.e. Inverter and Mains, to meet different application requirements.
The solar charging module applies the latest optimized MPPT technology to quickly track the maximum
power point of the PV array in any environment and obtain the maximum energy of the solar panel in
real time.
Through a state of the art control algorithm, the AC-DC charging module realizes fully digital voltage
and current double closed loop control, with high control precision in a small volume. Wide AC voltage
input range and complete input/output protections are designed for stable and reliable battery charging
and protection.
Based on full-digital intelligent design, the DC-AC inverter module employs advanced SPWM
technology and outputs pure sine wave to convert DC into AC. It is ideal for AC loads such as
household appliances, power tools, industrial equipment, and electronic audio and video equipment.
The product comes with a segment LCD design which allows real-time display of the operating data
and status of the system. Comprehensive electronic protections keep the entire system safer and more
stable.
Features:
1. With time-slot charging and discharging function, it can cut in and out of mains charging at
different times, and switch between battery discharging and mains bypass power supply
mode at different times.
2. Anti-backflow grid connection function (hybrid photovoltaic mains supply).
3. With insulation resistance and leakage current detection.
4. Supports battery-free operation.
5. Dual activation with lithium battery, triggered by either mains or photovoltaic power supply.
6. Power saving mode available to reduce no-load loss.
7. Available in 4 charging modes: Only Solar, Mains Priority, Solar Priority and Mains & Solar
hybrid charging.
8. Two output modes: mains bypass and inverter output, with uninterrupted power supply
function.
9. 360 ° all-around protection with a number of protection functions.
10. Supports lead-acid and lithium battery access.
11. ON/OFF switch controls inverter AC output.
12. Grid-connected PV mode can be set.
13. Fully digital voltage and current double closed loop control with advanced SPWM technology
for pure sine wave output.
14. Advanced MPPT technology with an efficiency of 99.9%.
15. Designed with a LCD screen and 3 LED indicators for dynamic display of system data and
operating status.
16. Intelligent variable speed fan efficiently dissipate heat and extend system life.
17. Complete protections, including short circuit protection, over voltage and under voltage
protection, overload protection, reverse protection, etc.

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1.2 Basic system introduction
The figure below shows the system application scenario of this product. A complete system consists of
the following parts:
1. PV module: Convert light energy into DC power, and charge the battery through the solar hybrid
inverter, or directly invert into AC power to drive the load.
2. Mains or generator: Connected at the AC input, to power the load while charging the battery. If
the mains or generator is not connected, the system can also operate normally, and the load is
powered by the battery and PV module.
3. Battery: Provided to ensure normal power supply to the system loads when solar energy is
insufficient and the Mains is not connected.
4. Household load: Allow connection of various household and office loads, including refrigerators,
lamps, TVs, fans and air conditioners.
5. Solar hybrid inverter: The energy conversion unit of the whole system.
Specific system wiring method depends on the actual application scenario.
PV array
Home Appliances
External Battery packs
Utility
Generator
or

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1.3 Appearance
①
Indicator light
⑨
AC input
②
LCD screen
⑩
RS485-2 Communication Port
③
Touch button
⑪
USB communication port
④
PV terminal
⑫
RS485-1 Communication Port
(WIFI / GPRS)
⑤
Battery terminal
⑬
Dry-contact port
⑥
Parallel communication A port
⑭
Overload protector
⑦
Parallel communication B port
⑮
CAN communication port
⑧
AC output

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1.4 Dimension drawing

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2. Installation instructions
2.1 Installation precautions
Please read this manual carefully prior to installation to familiarize yourself with the installation
steps.
Be very careful when installing the battery. Wear safety goggles when installing a lead-acid
liquid battery. Once coming into contact with the battery acid, rinse with clean water timely.
Do not place metal objects near the battery to prevent short-circuit of the battery.
Acid gas may be generated when the battery is charged. So, please ensure good ventilation.
When installing the cabinet, be sure to leave enough space around the solar hybrid inverter
for heat dissipation. Do not install the solar hybrid inverter and lead-acid battery in the same
cabinet to avoid corrosion by acid gas generated during battery operation.
Only the battery that meets the requirements of the solar hybrid inverter can be charged.
Poorly connected connections and corroded wires may cause great heat which will melt the
wire insulation, burn the surrounding materials, and even cause fires. So, make sure the
connectors have been tightened, and the wires are secured with ties to avoid looseness of
connections caused by shaking of wires during mobile application.
The system connection wires are selected according to a current density of not more than 5
A/mm2.
Even after the power is turned off, there is still high voltage inside the unit. Do not open or
touch the internal components, and avoid related operations until the capacitor completely
discharges.
Do not install the solar hybrid inverter in harsh environments such as moist, oily, flammable
or explosive, or heavily dusty areas.
Polarity at the battery input end of this product shall not be reversed, otherwise it may
damage the device or cause unpredictable danger.
The mains input and AC output are high voltage, so please do not touch the wiring terminals.
When the fan is working, do not touch it to prevent injury.
Load equipment input power needs to confirm that this solar hybrid inverter is the only input
device, and it is forbidden to use in parallel with other input AC power to avoid damage.

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2.2 Wiring specifications and circuit breaker selection
Wiring and installation must comply with national and local electrical codes.
Recommended PV array wiring specifications and circuit breaker selection: Since the output current of
the PV array is affected by the type, connection method and illumination angle of the PV module, the
minimum wire diameter of the PV array is calculated according to its short-circuit current; refer to the
short-circuit current value in the PV module specification (the short-circuit current is constant when the
PV modules are connected in series; the short-circuit current is the sum of the short-circuit currents of
all PV modules connected in parallel); the short-circuit current of the PV array shall not exceed the
maximum input current.
Refer to the table below for PV input wire diameter and switch:
Models
Recommended PV
wiring diameter
Maximum PV
input current
Recommended circuit
breaker type
HESP4840S100-H
6mm2/10AWG
16A / 16A
2P—25A
HESP4846S100-H
6mm2/10AWG
16A / 16A
2P—25A
HESP4850S100-H
6mm2/10AWG
16A / 16A
2P—25A
HESP4855S100-H
6mm2/10AWG
16A / 16A
2P—25A
HESP4860S100-H
6mm2/10AWG
16A / 16A
2P—25A
Note: The voltage in series shall not exceed the maximum PV input open circuit voltage.
Refer to the table below for recommended AC input wire diameter and switch:
Models
Recommended AC
input wiring diameter
Maximum bypass
input current
Recommended circuit
breaker type
HESP4840S100-H
10mm2/7AWG
40A
2P—40A
HESP4846S100-H
10mm2/7AWG
40A
2P—40A
HESP4850S100-H
10mm2/7AWG
40A
2P—40A
HESP4855S100-H
10mm2/7AWG
40A
2P—40A
HESP4860S100-H
10mm2/7AWG
40A
2P—40A
Note: There is already an appropriate circuit breaker at the Mains input wiring terminal, so it is not
necessary to add one more.

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Recommended battery input wire diameter and switch selection
Models
Recommended
battery wiring
diameter
Rated battery
discharge
current
Maximum
charge
current
Recommended
circuit breaker type
HESP4840S100-H
30mm2/2AWG
100A
100A
2P—160A
HESP4846S100-H
30mm2/2AWG
118A
100A
2P—160A
HESP4850S100-H
30mm2/2AWG
125A
100A
2P—200A
HESP4855S100-H
30mm2/2AWG
130A
100A
2P—200A
HESP4860S100-H
30mm2/2AWG
135A
100A
2P—200A
Recommended AC output wiring specifications and circuit breaker selection
Models
Recommended
AC output
wiring diameter
Rated inverter
AC output
current
Maximum
bypass output
current
Recommended
circuit breaker type
HESP4840S100-H
10mm2/7AWG
17.4A
40A
2P—40A
HESP4846S100-H
10mm2/7AWG
20A
40A
2P—40A
HESP4850S100-H
10mm2/7AWG
24A
40A
2P—40A
HESP4855S100-H
10mm2/7AWG
24A
40A
2P—40A
HESP4860S100-H
10mm2/7AWG
26A
40A
2P—40A
Note: The wiring diameter is for reference only. If the distance between the PV array and the solar
hybrid inverter or the distance between the solar hybrid inverter and the battery is relatively long, using
a thicker wire can reduce the voltage drop to improve system performance.
Note: The above are only recommended wiring diameter and circuit breaker. Please select the
appropriate wiring diameter and circuit breaker according to actual situations.

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2.3 Installation and wiring
Installation steps:
Step 1: Determine the installation position and the space for heat dissipation. Determine the installation
position of the solar hybrid inverter, such as wall surface; when installing the solar hybrid inverter,
ensure that there is enough air flowing through the heat sink, and space of at least 200mm to the left
and right air outlets and 500mm to the above and below air outlets of the inverter shall be left to ensure
natural convection heat dissipation. Refer to the installation diagram of the whole machine as above.
Warning: Danger of explosion! Never install the solar hybrid inverter and lead-acid battery in the
same confined space! Also do not install in a confined place where battery gas may collect.

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Step 2: Open 4 holes in the wall according to the following dimensions, and knock in expansion screws,
as shown in the following figure:
Step 3: Hang up the machine and tighten the screws.

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Step 4: Remove the terminal cover
Step5: Connect the Wire. ( Note: The wire shall penetrate into the corresponding joint before crimping
the terminal )

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Connection method of AC I/O:
1Prior to AC I/O wiring, disconnect the external circuit breaker and confirm whether the cable used
is thick enough. Please refer to Chapter "2.2 Wiring Specification and Circuit Breaker Selection";
2According to the cable sequence and terminal position shown in the following figure, connect the
AC input line properly, please connect the grounding wire first, then connect the live wire and the
neutral wire;
L: Live Wire N: Neutral Wire : Ground Wire
3Connect the AC output line properly according to the cable sequence and terminal position
shown in the above figure. Please connect the ground wire first, then the live wire and the neutral
wire.
Wiring Method of PV Input:
1Prior to wiring, disconnect the external circuit breaker and confirm whether the cable used is
thick enough. Please refer to Chapter "2.2 Wiring Specification and Circuit Breaker Selection";
2According to the cable sequence and terminal position shown in the following figure, connect the
PV input line properly.
BAT Wiring Method:
1Prior to wiring, disconnect the external circuit breaker and confirm whether the cable used is
thick enough. Please refer to Chapter "2.2 Wiring Specification and Circuit Breaker Selection".
BAT wire shall be connected with the machine through O-terminal. It is recommended to use O-
terminal with inner diameter of 7mm. The O-terminal must firmly compress BAT wire to prevent
excessive heating caused by excessive contact impedance;
2According to the cable sequence and terminal position shown in the following figure, connect the
BAT wire properly.

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Ground Wire of the Entire Machine:
As shown in the following figure, it is located on the bottom of the chassis and shall be be connected
by O-terminal. It is recommended to use O-terminal with inner diameter of 6mm.
Note: As far as possible, the ground cable should be much thicker as possible (the sectional area of
wire should not be less than 4mm2) and the grounding point should be kept close to the inverter as
possible. The ground wire shall be shorter as possible.
Warning:
1Mains input, AC output and PV array will generate high voltage. So, before wiring, be sure to
opening the circuit breaker or fuse;
2Pay attention to safety in the process of wiring. Do not close the circuit breaker or fuse and
ensure the "+" and "-" pole leads of each component be connected properly in the process of

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wiring; the circuit breaker must be installed at the battery end. Please refer to Chapter 2.2
“Wiring Specification and Circuit Breaker Selection” for their selection. Before wiring, please be
sure to disconnect the circuit breaker to prevent strong electric spark in the process of wiring
and avoid short-circuiting the battery in the process of wiring. If the inverter is applied in area
with frequent lightning, it is recommended to install an external surge protection device at PV
input.
Step 6: Check whether wires are connected properly and firmly, especially check whether the
positive and negative of the battery input are reversely connected, whether the positive and negative of
PV input are reversely connected and whether the AC input is improperly connected to the AC output.
Step 7: Tighten the waterproof joint cover and close the machine cover back.
Step 8: Start the inverter. First close the circuit breaker at the battery end, then press the circular
ON/OFF switch on the right of the machine.
The flashing of "AC/INV" indicator lamp indicates that the inverter works normally. Close the circuit
breaker of PV array and mains power again. Finally, open the AC load one by one after the AC output is
normal so as to avoid protection action caused by major instantaneous impact caused by opening the
load at the same time and ensure that the inverter work normally in the preset mode.
Note: If power is supplied to different AC loads, it is recommended to turn on the load with high
impulse current first, and then turn on the load with small impulse current till the load can work stably.
Note: If the inverter is not working properly or the LCD or indicator light displays abnormally, please
refer to Chapter 6 for troubleshooting.

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2.4 Parallel machine wire connection
2.4.1 Introduction
1. Up to six units connected in parallel.
2. When using the parallel operation function, the following connecting lines (package
accessories) shall be firmly and reliably connected:
Parallel communication line*1:
2.4.2 Precautions for connecting the parallel connecting lines
Warning:
1. PV connection:
When connected in parallel, the PV arrays of each machine must be independent and the PV
arrays of PV1 and PV2 of each machine must also be independent.
2. Battery wiring:
Parallel connection in single or three-phase: ensure that all solar hybrid inverters are
connected to the same battery, with BAT + connected to BAT + , BAT - connected to BAT -,
and that the connection is correct with the same wiring length and line diameter before
power on, so as to avoid the abnormal operation of parallel system output caused by wrong
connection.
3. AC OUT wiring:
Parallel connection in single phase: ensure L-to-L, N-to-N and PE-to-PE connection for all
solar hybrid inverters, and that the connection is correct with the same wiring length and line
diameter before power on, so as to avoid the abnormal operation of parallel system output
caused by wrong connection. For specific wiring, please refer to 2.4.3 Wiring Diagram.
Parallel connection in three-phase: ensure N-to-N and PE-to-PE connection for all solar
hybrid inverters. The L lines of all inverters connected to the same phase need to be
connected together. But L lines of different phases cannot be joined together. Other

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connection precautions are the same as parallel connection in single phase. For specific
wiring, please refer to 2.4.4 Wiring Diagram.
4. AC IN wiring:
Parallel connection in single phase: ensure L-to-L, N-to-N and PE-to-PE connection for all
solar hybrid inverters, and that the connection is correct with the same wiring length and line
diameter before power on, so as to avoid the abnormal operation of parallel system output
caused by wrong connection. Meanwhile, it is not allowed to have multiple different AC
source inputs to avoid damage to the external equipment of the inverter. The consistency and
uniqueness of AC source input shall be ensured. For specific wiring, please refer to 2.4.3
Wiring Diagram.
Parallel connection in three-phase: ensure N-to-N and PE-to-PE connection for all solar
hybrid inverters. The L lines of all inverters connected to the same phase need to be
connected together. But L lines of different phases cannot be joined together. Other
connection precautions are the same as parallel connection in single phase. For specific
wiring, please refer to 2.4.4 Wiring Diagram.
5. Wiring of parallel communication line:
Our parallel communication cable is a shielded 8Pin network connection cable, which can be
used for single-phase or three-phase parallel connection. Each machine must be connected
with one out and one in. This means that the machine "Parallel_A" is connected to the
machine to be parallelized "Parallel_B", and that the machine "Parallel_A" is not allowed to
connect to the "Parallel_B". "Parallel_B" or "Parallel_A" is connected to the machine to be
parallelized "Parallel_A". At the same time, the parallel communication cable of each machine
should be fastened with 8Pin network connection cable to avoid disconnection or poor
contact of the parallel communication cable, which may cause abnormal operation or
damage to the system output.
6. Before and after connecting the system, please check the following system wiring diagrams
in detail to ensure that all wiring is correct and reliable before powering on.
7. After the system is wired, powered on and in normal operation, if a new inverter needs to be
connected, make sure to disconnect the battery input, PV input, AC input and AC output, and
that all solar hybrid inverters are powered off before reconnecting into the system.

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2.4.3 Schematic diagram of parallel connection in single phase
1. The parallel communication line and current sharing detection line of the solar hybrid inverter
need to be locked with screws after connecting. The schematic diagram is as follows:
2. In case of parallel operation with multiple inverters, the schematic diagram of parallel
connection is as follows:
a）Two solar hybrid inverters of the system connected in parallel:

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b）Three solar hybrid inverters of the system connected in parallel:
c）Four solar hybrid inverters of the system connected in parallel: