REFU 801 Series User manual

Version 1 (No. 982075) 801 Series (1T) October 2019
Operating Instructions
REFUone 1.6K-1T ... 3.3K-1T

REFUone 1.6K-1T … 3.3K-1T
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Notice
This manual contains important sa ety instructions that must be ollowed during installation
and maintenance o the equipment.
Save these instructions!
This manual must be considered as an integral part o the equipment, and must be available
at all times to everyone who interacts with the equipment. The manual must always
accompany the equipment, even when it is trans erred to another user or ield.
Copyright eclaration
The copyright o this manual belongs to REFU Elektronik GmbH. Any corporation or individual
should not plagiarize, partially copy or ully copy it (including so tware, etc.), and no
reproduction or distribution o it in any orm or by any means. All rights reserved.
REFU reserves the right o inal interpretation. This manual is subject to change according to
user’s or customer’s eedback. Please check our website at http://www.re u.com or latest
version.
REFU Elektronik GmbH
Marktstraße 185
D-72793 P ullingen
Tel.: [phone]
Fax: [phone]
Mail: in o@re u.com

REFUone 1.6K-1T … 3.3K-1T
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Preface
Outline
Please read the product manual care ully be ore installation, operation or maintenance. This
manual contains important sa ety instructions and installation instructions that must be
ollowed during installation and maintenance o the equipment.
Scope
This product manual describes the installation, electrical connections, commissioning,
maintenance and troubleshooting o REFUone 1.6K-1T … 3.3K-1T inverters.
Keep this manual where it will be accessible at all times.
Target Group
This manual is intended or quali ied electrical technical personnel who are responsible or
inverter installation and commissioning in the PV power system and the PV plant operator.
Symbols Used
This manual provides sa ety operation in ormation and uses the symbol in order to ensure
personal and property security and use the inverter e iciently when operating the inverter.
You must understand these emphasized in ormation to avoid the personal injury and property
loss. Please read the ollowing symbols used in this manual care ully.
anger indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
ANGER
Warning indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
WARNING
Caution indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
CAUTION
Attention indicated potential risks which, if not avoided, may lead to equipment fault
or property damage.
ATTENTION
Note provides tips that are valuable for the optimal operation of the product.
Note

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Table of Contents
1 Basic safety information ................................................................................... 5
1.1 Sa ety instructions ............................................................................................................................ 5
1.2 Symbols and signs ............................................................................................................................ 8
2 Product characteristics ...................................................................................... 9
2.1 Product dimensions ......................................................................................................................... 9
2.2 Function description ...................................................................................................................... 12
2.3 E iciency curve .............................................................................................................................. 13
3 Installation ..................................................................................................... 14
3.1 Installation Process ........................................................................................................................ 14
3.2 Checking Be ore Installation .......................................................................................................... 14
3.3 Tools ............................................................................................................................................... 16
3.4 Determining the Installation Position ............................................................................................ 17
3.5 Moving the REFUone inverter ........................................................................................................ 19
3.6 Installing REFUone inverter ............................................................................................................ 20
4 Electrical Connections ..................................................................................... 21
4.1 Electrical connection ...................................................................................................................... 22
4.2 Connecting PGND Cables ............................................................................................................... 22
4.3 Connecting DC Input Power Cables ............................................................................................... 23
4.4 Connecting AC Output Power Cables............................................................................................. 25
4.5 Connecting RS485, CT, DRMs Cables ............................................................................................. 28
4.6 WiFi/GPRS module installation proced ure ............................................................................ 32
4.7 WiFi Communication ...................................................................................................................... 32
4.8 Monitoring Portal REFUlog ............................................................................................................ 34
4.9 RS485 Communication ................................................................................................................... 35
5 Commissioning of inverter .............................................................................. 36
5.1 Sa ety inspection be ore commissioning ....................................................................................... 36
5.2 Start Inverter .................................................................................................................................. 36
6 Operation interface ........................................................................................ 37
6.1 Operation and Display Panel.......................................................................................................... 37
6.2 Standard Inter ace.......................................................................................................................... 38
6.3 Main Inter ace ................................................................................................................................ 39
6.4 Update So tware ............................................................................................................................ 47
7 Trouble shooting and maintenance ................................................................. 48
7.1 Trouble shooting ............................................................................................................................. 48
7.2 Maintenance .................................................................................................................................. 53
8 Technica l data ................................................................................................. 54
8.1 DC Data ........................................................................................................................................... 54
8.2 AC Data ........................................................................................................................................... 54
8.3 E iciency, Protection and Communication ................................................................................... 55
8.4 General Data .................................................................................................................................. 55
9 Quality Assurance ........................................................................................... 56
10 Technical Support ........................................................................................... 57

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1 Basic safety information
If you have any question or problem when you read the following information,
please contact REFU Elektronik GmbH.
Note
Outlines of this chapter
Safety instruction
It mainly introduce the sa ety instruction when install and operate the equipment.
Symbols and signs
It mainly introduce the sa ety symbols on the inverter.
1.1 Safety instructions
•Read and understand the instructions o this manual, and be amiliar with relevant
sa ety symbols in this chapter, then start to install and troubleshoot the equipment.
•According to the national and state requirements, be ore connecting to the electrical
grid, you must get permission rom the local electrical grid operator, and the operation
can only be per ormed by quali ied electrical engineer.
•Please contact the nearest authorized service center i any maintenance or repair is
needed. Contact your distributor or the in ormation o the nearest authorized service
center. Do NOT repair it by yoursel , it may cause injury or property damage.
•Be ore installing and maintaining the equipment, you should turn the DC switch OFF to
cut o the high voltage DC o the PV array. You can also turn the switch in the PV
combiner box OFF to cut o the high voltage DC. Otherwise, serious injury may be
caused.
1.1.1 Qualified persons
The customer must make sure the operator has the necessary skill and training to do his/her
job. Sta in charge o using and maintaining the equipment must be skilled, aware and mature
or the described tasks and must have the reliability to correctly interpret what is described in
the manual. For sa ety reason only a quali ied electrician, who has received training and / or
has demonstrated skills and knowledge in construction and in operation o this unit, can install
this inverter. REFU Elektronik GmbH does not take any responsibility or the property
destruction and personal injury because o any incorrect use.
1.1.2 Installation requirements
Please install inverter according to the ollowing section. Fix the inverter on an appropriate
objects with enough load bearing capacity (such as walls, PV racks etc.), and ensure that
inverter is vertical placed. Choose a place suitable or installing electrical devices. Assure there
is enough ire exit space, convenient or maintenance. Maintain proper ventilation to ensure
enough air cycle to cool the inverter.

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1.1.3 Transport requirements
I you ind packing problems that may cause the damage o the inverter, or ind any visible
damage, please immediately notice the responsible transportation company. You can ask solar
equipment installation contractor or REFU Elektronik GmbH or help i necessary. Transport o
the equipment, especially by road, must be carried out by suitable ways and means or
protecting the components (in particular, the electronic components) rom violent shocks,
humidity, vibration, etc.
1.1.4 Electric connection
Please comply with all the current electrical regulations about accident prevention in dealing
with the solar inverter.
Before the electrical connection, make sure to use opaque material to
cover the PV modules or to disconnect PV array C switch. Exposure to
the sun, PV array will produce a dangerous voltage!
ANGER
All installation accomplished only by professional electrical engineer!
•must be trained;
• Completely read the manual operation and understand relevant
matters.
WARNING
Get permission from the local electrical grid operator, complete all
electrical connections by professional electrical engineer, then connect
inverter to electrical grid.
ATTENTION
It is forbidden to remove the tamper evident label, or open the inverter.
Otherwise REFU will not provide warranty or maintenance!
Note

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1.1.5 Operation
Touching the electrical grid or the terminal of the equipment may lead to
electrocution or fire!
•on’t touch the terminal or conductor connected to the electrical grid.
•Pay attention to any instructions or safety documents related to grid
connection.
ANGER
Some internal components will be very hot when inverter is working.
Please wear protective gloves!
ATTENTION
1.1.6 Maintenance and repair
•Before any repair work, turn OFF the AC circuit breaker between the
inverter and electrical grid first, then turn OFF the C switch.
•After turning OFF the AC circuit breaker and C switch, wait for 5
minutes at least before carrying out any maintenance or repair work.
ANGER
•Inverter should work again after removing any faults. If you need any
repair work, please contact with the local authorized service center;
•Can’t open the internal components of inverter without authorized.
REFU Elektronik GmbH does not take any responsibility for the losses
from that.
ATTENTION
1.1.7 EMC / noise level of inverter
Electromagnetic compatibility (EMC) re ers to that one electrical equipment unctions in a
given electromagnetic environment without any trouble or error, and impose no unacceptable
e ect upon the environment. There ore, EMC represents the quality characters o an electrical
equipment.
•The inherent noise-immune character: immunity to internal electrical noise.
•External noise immunity: immunity to electromagnetic noise o external system
•Noise emission level: in luence o electromagnetic emission upon environment.
Electromagnetic radiation from inverter may be harmful to health!
Please do not continue to stay around the inverter in less than 20 cm when
inverter is working.
ANGER

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1.2 Symbols and signs
1.2.1 Safety symbols
Caution of burn injuries due to hot enclosure!
•You can only touch the screen and pressing key of the inverter while it’s
working.
CAUTION
PV array should be grounded in accordance to the requirements of the local
electrical grid operator!
We suggest that all PV module frames and inverter are reliably grounded to
protect the PV system and personnel security.
ATTENTION
Ensure input C voltage < Max. C voltage .Over voltage may cause
permanent damage to inverter or other losses, which will not be included in
warranty!
WARNING
1.2.2 Signs on the inverter
There are some symbols, which are related to security on the inverter. Please read and
understand the content o the symbols, and then start the installation.
There is a residual voltage in the inverter! Before opening the
equipment, operator should wait for five minutes to ensure the
capacitor is discharged completely.
Caution, risk of electric shock.
Caution, hot surface.
Comply with the (CE) certification.
Grounding point.
Please read this manual before install REFUone inverters.
IP65 This indicates the degree of protection of the equipment according to
IEC standard EN 60529 June 1997.
Positive pole and negative pole of the input voltage ( C).

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2 Product characteristics
Outlines of this chapter
Product dimensions
It introduces the ield o use, and the overall dimensions o the REFUone inverters.
Function description
It introduces how REFUone inverters work and the unctionality o the device.
Efficiency curves
It introduces the e iciency curves o in the inverter.
2.1 Product dimensions
2.1.1 Field of use
REFUone inverters are single MPPT grid-tied PV inverters which converts the DC power
generated by PV arrays into sine wave single-phase AC power and eeds it to the public
electrical grid, AC circuit breaker (re er to Section 4.4) and DC switch used as disconnect
device, and the disconnect device shall be easily accessible.
PV Grid-tied System
REFUone inverters can only be used with photovoltaic modules that do not require one o the
poles to be grounded. The operating current during normal operation must not exceed the
limits speci ied in the technical speci ications. Only the photovoltaic modules can be connected
to the input o the inverter (do not connect batteries or other sources o power supply).
•The choice o optional parts o inverter should be made by a quali ied technician who
knows the installation conditions clearly.
•Overall dimensions REFUone 1.6K-1T (L×W×H): 303 × 261 × 118 mm.
•Overall dimensions REFUone 3.3K-1T (L×W×H): 321 × 261 × 132 mm.

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Front view and left view dimensions of REFUone 1.6K-1T
Front view and left view dimensions of REFUone 3.3K-1T
RUN
FAULT
261 mm
303 mm
118 mm
RUN
FAULT
261 mm
321 mm
131 mm

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Back view and Bracket dimensions REFUone 1.6K-1T…3.3K-1T
2.1.2 Labels on the equipment
The labels must NOT be hidden
with objects and extraneous
parts (rags, boxes, equipment,
etc.); they must be cleaned
regularly and kept visible at all
times.
235.0 mm
78.1 mm
160.0 mm
6 mm
21.4 mm
10 mm
80.0 mm
Inversor Solar
Grid-Tied
Modelo: REFUone 3.3K-1T
fabricados na República Popular da China
REFU Elektronik GmbH, Marktstrasse 185
72793 Pfullingen, Alemanha www.refu.com
Tipo: 801P003.100

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2.2 Function description
DC power generated by PV array is iltered through Input Board be ore entering into Power
Board. Input Board also o er unctions such as insulation impedance detection and input DC
voltage / current detection. DC power is converted to AC power by Power Board. AC power is
iltered through Output Board then AC power is ed into the grid. Output Board also o er
unctions such as grid voltage / output current detection, GFCI and output isolation relay.
Control Board provides the auxiliary power, controls the operation state o inverter and shows
the operation status by Display Board. Display Board displays ault code when inverter is in
abnormal operation conditions. At the same time, Control Board can trigger the relay so as to
protect the internal components.
Function module
Energy management unit
This control can be used to switch the inverter on/o through an external (remote) control.
Feeding reactive power into the grid
The inverter is able to produce reactive power and can there ore eed it into the grid through
the setting o the phase shi t actor. Feed-in management can be controlled directly by the
grid company through a dedicated RS485 serial inter ace.
Limiting the active power fed into the grid
The inverter, i enabled can limit the amount o active power ed into the grid by the inverter
to the desired value (Expressed as a percentage).
Self power reduction when grid is over frequency
When the grid requency is higher than the limited value, inverter will reduce output power
which is necessary or the grid stability.
ata transmission
The inverter or a group o inverters may be monitored remotely through an advanced
communication system based on RS-485 serial inter ace, or remotely via the WiFi.
Software update
USB adaptor is used or updating the irmware.

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Electrical block diagram
Electrical block diagram
2.3 Efficiency curve
Efficiency Curve REFUone 3.3K-1T
1
AC grid relais
AC EMC filter
AC Output
DC EMC filter
DC/DC Booster
L1
PE
Master DSP Slave DSP
N
1A -
1A +
DC Swit h
DC/AC Inverter
DC Input
MPPT
WiFi RS485
In/Out
Remote
Control
USB GPRS/Ethernet
(opt.)

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Moving the
Inverter
3 Installation
Outlines of this chapter
This topic describes how to install the REFUone inverters.
Installation notes
•o NOT install the REFUone inverter on flammable material.
•o NOT install the REFUone inverter in an area used to store flammable or
explosive materials.
ANGER
•The enclosure and heat sink are very hot while the inverter is working,
therefore do NOT install the REFUone inverter in places where you might touch
them inadvertently.
CAUTION
•Consider the weight of the inverter when transporting and moving.
•Choose an appropriate mounting position and surface.
•Assign at least two persons to install the inverter.
ATTENTION
3.1 Installation Process
Installation flowchart
3.2 Checking Before Installation
3.2.1 Checking Outer Packing Materials
Packing materials and components may be damaged during transportation. There ore, check
the outer packing materials be ore installing the inverter. Check the outer packing materials
or damage, such as holes and cracks. I any damage is ound, do not unpack the REFUone
inverter and contact the dealer as soon as possible. You are advised to remove the packing
materials within 24 hours be ore installing the REFUone inverter.
3.2.2 Checking eliverables
A ter unpacking the inverter, check whether deliverables are intact and complete. I any
damage is ound or any component is missing, contact the dealer.
End Install the
Inver
ter
Install the rear panel
Check before
installation
Prepare installation
tools
etermine the
installation position

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Table 1 shows the components and mechanical parts that should be delivered
No. Pictures escription Quantity
1 REFUone inverter 1 pcs
2 Rear panel 1 pcs
3 PV+ input terminal 1 pcs
4 PV-input terminal 1 pcs
5
Metal terminals secured to PV+ input power
cables
1 pcs
6 Metal terminals secured to PV- input power
cables
1 pcs
7 M5 Hexagon screws 2 pcs
8 Expansion bolts 3 pcs
9 Self-tapping screw 5 pcs
10 Manual
(English and Portuguese)
1 pcs
11 AC output terminal 1 pcs
12 485 terminal (2pin) 1 pcs

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3.3 Tools
Prepare tools required or installation and electrical connections.
Table 2 shows the tools required for installation and electrical connections.
No. Tool Model Function
1 Hammer drill
Recommend drill dia.
6mm
Used to drill holes on the wall
2 Screwdriver wiring
3 Removal tool Remove PV terminal
4 Wire stripper Strip wire
5 4mm Allen Wrench Turn the screw to connect rear panel
with inverter
6 Crimping tools Used to crimp power cables
7 Multi-meter Used to check grounding
8 Marker Used to mark signs
9 Measuring tape Used to measure distances
10 Level Used to ensure that the rear panel is
properly installed
11 ES gloves Operators wear
0-180º

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12 Safety goggles Operators wear
13 Anti-dust respirator Operators wear
3.4 etermining the Installation Position
Determine an appropriate position or installing the REFUone inverter. Comply with the
ollowing requirements when determining the installation position:
Installation Requirements

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clearance for single REFUone inverter
Installation of multiple REFUone inverters
100 cm
20 cm
10 cm
30
cm

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3.5 Moving the REFUone inverter
This topic describes how to move the REFUone horizontally to the installation position
Step 1: Open the packaging, insert hands into the slots on both sides o the inverter and hold
the handles, as shown in Figure 11 and Figure 12.
Moving the REFUone inverter (1)
Moving the REFUone inverter (2)
Step 2: Li t the REFUone rom the packing case and move it to the installation position.
To prevent device damage and personal injury, keep balance when moving the
inverter because the inverter is heavy.
o not put the inverter with its wiring terminals contacting the floor because
the power ports and signal ports are not designed to support the weight of the
inverter. Place the inverter horizontally.
When placing the inverter on the floor, put foam or paper under the inverter to
protect its shell
ATTENTION

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3.6 Installing REFUone inverter
Step 1: Determine the positions or drilling holes, ensure the hole positions are level, then
mark the hole positions using a marker pen, use the hammer drill to drill holes on the wall.
Keep the hammer drill perpendicular to the wall, do not shake when drilling, so as not to
damage the wall. I the error o the hole positions is too big, you need to reposition.
Step 2: Insert the expansion bolt vertically into the hole, pay attention to the insertion depth
o the expanding bolt (should be deep enough).
Step 3: Align the rear panel with hole positions, ix the rear panel on the wall by tightening the
expansion bolt with the nuts.
Wall mounting 3K-2T, 5K-2T
Step 1 Step 2 Step 3
Step 4: Hook the inverter to the rear panel. Use a M5 screw to secure the inverter to the rear
panel to ensure sa ety.
Step 5: You can secure the inverter to the rear panel and protect it rom stealing by installing
an anti-the t lock (this action is optional).
Securing the REFUone inverter
Step 4 Step 5