REFU REFUsol 100K User manual

Document No./Issue | 982059/02
Issue Date | 2020-11
Operating manual
Solar Inverter
REFUsol 100K
Product | REFUsol 100K
Languages | English
EnglishDeutsch

2
Copyright
© REFU Elektronik GmbH
The reproduction, distribution and utilization of this
document as well as the communication of its contents
to others without express authorization is prohibited.
Offenders will be held liable for the payment of dama-
ges. All rights reserved in the event of the grant of a
patent, utility model or design.
Liability
The data specified is only used to describe the product
and should not be interpreted as warranted characte-
ristics in the legal sense. The right to change the con-
tent of this documentation and the availability of the
products are reserved.
Publisher
REFU Elektronik GmbH
Marktstraße 185
72793 Pfullingen, GERMANY
✆ [phone]
✆ [phone] (Service)
℻ [phone]
✉
[email protected]
✉ [email protected]
 www.refu.com

3REFUsol 100K
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EnglishDeutsch
Contents
1 About this Manual...................................... 5
1.1 Scope of this Manual .........................................5
1.2 Target Group of this Manual .............................5
1.3 Presentation of Information..............................5
1.3.1 Symbols ..................................................................... 6
1.3.2 Warnings in this Manual............................................ 6
2 Safety and Responsibility........................... 7
2.1 Safety Guidelines...............................................7
2.2 Rules for Safe Installation and Operation.........7
2.3 Symbols and Warnings on the Product.............8
2.4 Designated Use..................................................9
2.5 Requirements for Electricians..........................9
2.6 General Safety Instructions...............................9
2.7 Five Safety Rules When Working on
Electrical Systems...........................................10
3 Technical Description .............................. 10
3.1 ConnectionBox Central/Decentral..................10
3.2 Components of the Decentral ConnectionBox11
3.3 Components of the Central ConnectionBox ...11
3.4 Device Size and Distances...............................12
3.5 Mounting Location .......................................... 13
3.6 Dimensions ..................................................... 14
3.7 Functionality of the Inverter........................... 14
3.8 Requirements for the Infrastructure ............. 15
4 Installation ............................................... 16
4.1 General Warnings........................................... 16
4.2 Auxiliary Means and Tools.............................. 17
4.3 Unpacking the ConnectionBox ....................... 17
4.4 Mounting the ConnectionBox ......................... 18
4.4.1 Mounting the ConnectionBox Vertically.................. 18
4.4.2 Mounting the ConnectionBox Horizontally ............. 19
4.4.3 Mounting the ConnectionBox on a Pole.................. 19
4.5 Wiring DC and AC Cables
(Central ConnectionBox) ................................ 19
4.6 Wiring AC Cables (Decentral ConnectionBox) 20
4.7 Wiring DC Cables (Decentral ConnectionBox)22
4.8 Checking String Fuses ................................... 24
4.9 Installing the Surge Protection Devices
SPD (optional) ................................................. 25
4.10 Communication Connections ......................... 25

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4.11 Connect RS485/LAN........................................26
4.12 RJ45 Connector Cabling..................................27
4.13 Setting up the Communication........................28
4.13.1 RS485 Network........................................................ 28
4.13.2 Ethernet Network.................................................... 28
4.13.3 Ethernet Direct Connection..................................... 29
4.14 Connect Remote Off Signal (DRM 0) ...............29
4.15 Testing Electrical Safety .................................30
4.16 Unpacking the PowerUnit ...............................30
4.17 Hooking in the PowerUnit ...............................31
4.18 Connecting AC, DC and PEN ...........................32
4.19 Closing and Fixing the PowerUnit...................33
5 Commissioning ........................................ 33
5.1 Before Startup.................................................33
5.2 Startup.............................................................33
5.3 Configuring Inverters with the
Mobile App REFUset........................................35
5.4 Configuring Inverters with the
PC Software REFUset......................................36
6 REFUlog – Monitoring portal................... 37
7 Technical Data ......................................... 38
7.1 PowerUnit........................................................38
7.2 ConnectionBox Variants ................................. 43
8 Single Line Diagrams............................... 44
9 Maintenance............................................. 46
9.1 General Warnings........................................... 46
9.2 Replacement................................................... 47
9.2.1 Replacing the PowerUnit Fan.................................. 47
9.2.2 Replacing the Central ConnectionBox Fan............. 47
9.2.3 Checking or Replacing the PV Fuses ...................... 48
9.2.4 Replacing the DC Cable Bushing
(decentral ConnectionBox)...................................... 49
9.2.5 Replacing the Sealing Gasket of the
ConnectionBox......................................................... 49
9.3 Periodicity of Maintenance ............................. 49
10 Disposal....................................................50
11 Troubleshooting....................................... 51
11.1 Error List......................................................... 51

About this Manual 5
Scope of this Manual
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EnglishDeutsch
1 About this Manual
1.1 Scope of this Manual
This manual applies to the following products:
∘REFUsol 100K Solar Inverter
∘REFUsol Decentral ConnectionBox
∘REFUsol Central ConnectionBox
Fig. 1: Power rating depending on AC voltage
1.2 Target Group of this Manual
This manual is intended for installers, operators,
service technicians and plant operators.
This manual contains basic information, to assem-
ble the product safely and properly, to transport, to put
into operation and to operate.
▷Read this manual completely and in particular the
chapter "Safety and Responsibility", before you
work with the product.
1.3 Presentation of Information
To enable you to handle your product safely and
quickly with these instructions, uniform warnings,
symbols, designations and abbreviations are used.

About this Manual6
Presentation of Information
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1.3.1 Symbols
The following symbols indicate instructions which
are intended to make the instructions easier to under-
stand.
1.3.2 Warnings in this Manual
Warnings in this manual indicate an action where
there is a risk of personal injury or property damage.
Always observe the measures described to avert the
danger.
The warnings in this manual are presented in a box
that contains the following information:
Tab. 1: Symbols/signs
Symbol Meaning
Useful information on the optimal and most eco-
nomical use of the product.
✅Prerequisite for an action that must be com-
pleted/executed beforehand.
▷Single action step that is to be executed.
▸Sub-step of an action step that is to be executed.
⟇Alternative action that can also be executed. Par-
tially conditioned by other prerequisites.
1.
2.
3.
Numbered action instruction that is to be exe-
cuted in the order listed.
➪Result of the action instruction.
... > ... Menu sequence in a software that is to be clicked
one after the other.
SIGNAL WORD/WARNING CATEGORY
Type and source of danger
Consequences of ignoring the warnings.
▸Measures required to avoid the danger.

Safety and Responsibility 7
Safety Guidelines
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EnglishDeutsch
2 Safety and Responsibility
The product has been manufactured in accordance
with the generally accepted state of the art. Neverthe-
less, there is a risk of personal injury and property
damage if you do not observe this chapter and the
warnings in this manual.
▷Read this manual thoroughly and completely before
using the product.
2.1 Safety Guidelines
Installation, commissioning, and operation of the
product must be carried out by (electrically) qualified
personnel.
▷Read all technical information and safety instruc-
tions before installing and using the product.
2.2 Rules for Safe Installation and Operation
∘Do not attempt to install or operate the product
without proper training.
∘Ground the product properly.
DANGER
Leads directly to death or serious personal injury if ig-
nored.
▸Follow the warnings to avoid death or serious injury!
WARNING
May result in death or serious personal injury if ignored.
▸Follow the warnings to avoid serious injuries!
CAUTION
May cause minor personal injury if ignored.
▸Follow the warnings to avoid injury!
NOTICE
Can lead to property damage if ignored.
▸Follow the warnings to avoid damage or destruction of
the product!

Safety and Responsibility8
Symbols and Warnings on the Product
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∘Ground the metal supporting frame of the PV mod-
ules using potential equalization.
∘Only use class A PV modules according to
IEC 61730.
∘Connect all cables properly.
∘Before switching on, check the AC and DC voltages
and polarity. Observe the information on the data
sheet or type plate.
∘Take appropriate precautions to protect against
electrostatic discharge (ESD).
∘Always be careful around this equipment.
∘Never remove the PowerUnit (inverter) cover.
∘To ensure safe operation, carry out all work profes-
sionally, including transport, storage, assembly, in-
stallation and operation.
2.3 Symbols and Warnings on the Product
Fig. 2: Symbols on the product
1General warning
2Warning of electrical voltage
3Warning of hot surface
4Follow the instructions before
use
5Ground before use
6Warning of electrical voltage on
AC and DC side. All strings on
the DC side are live
7Unlock before main-
tenance or repair
8Discharge time of 2
minutes
9Warning of a de-
vice's susceptibility
to electrostatic dis-
charge
3
Discharge
time
2 min.
1 2 3
9876
4 5

Safety and Responsibility 9
Designated Use
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2.4 Designated Use
The REFUsol 100K, is a solar inverter, which trans-
forms the direct current generated by the PV generator
(photovoltaic modules) into alternating current and can
feed it into mains supply.
The REFUsol 100K complies with protection class
IP65 (ConnectionBox: IP54) and can be used indoors
and outdoors.
The REFUsol 100K is only intended for use with the
corresponding central or decentral ConnectionBox.
2.5 Requirements for Electricians
The activities described in this manual require basic
knowledge of the electrical system, the associated
technical terms and the relevant technical rules. To
ensure safe use, these activities may therefore only be
carried out by an appropriate specialist or a trained
person under the supervision of a specialist.
A skilled person is a person who, on the basis of his
professional training, his knowledge and experience as
well as his knowledge of the relevant regulations, can
assess the work assigned to him, recognize possible
dangers and take suitable safety measures.
2.6 General Safety Instructions
▷Observe the valid regulations for accident preven-
tion and environmental protection.
▷Observe the safety regulations and regulations of
the country in which the product is used.
▷Only use products in technically perfect condition.
▷Observe all notes on the product.
▷Persons installing, operating or maintaining prod-
ucts must not be under the influence of drugs or
medication.
▷Use only accessories and spare parts approved by
REFU Elektronik GmbH in order to exclude a per-
sonal hazard due to unsuitable spare parts.
▷Observe the technical data and ambient conditions
specified in the manual.
▷Do not put the product into operation until it has
been determined that it complies with country-spe-
cific rules, regulations, safety regulations/certifi-
cates and application regulations.

Technical Description10
Five Safety Rules When Working on Electrical Systems
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2.7 Five Safety Rules When Working on Elec-
trical Systems
Disconnect electrical systems (lock and tag)
according to the five safety rules:
▷Unlock and disconnect completely.
▷Secure against re-connection.
▷Check that there is no voltage (DC and AC).
▷Carry out earthing and short-circuiting.
▷Provide protection against adjacent live parts.
3 Technical Description
3.1 ConnectionBox Central/Decentral
Fig. 3: Available variants: central and decentral
DecentralCentral

Technical Description 11
Components of the Decentral ConnectionBox
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EnglishDeutsch
3.2 Components of the Decentral Connection-
Box
Fig. 4: Components of the decentral ConnectionBox
3.3 Components of the Central ConnectionBox
Fig. 5: Components of the central ConnectionBox
DC fuses
DC switch
AC cables
clamp
AC switch
AC/DC SPD
DC cables clamp
Recess to
attach the
hydraulic rod
Device
holder
Fans
AC cable
grommet
DC cable bushing
Communica-
tion cable
gland
AC cables
clamp
DC cables
clamp
Recess to
attach the
hydraulic rod
Device
holder
Fan
AC switch
DC switch
AC cable
gland
DC SPD
Communica-
tion cable
gland
DC cable
glands

Technical Description12
Device Size and Distances
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3.4 Device Size and Distances
Fig. 6: Installation site: distances/free space
Fig. 7: Installation site: distances/free space
400 mm
(16 in)
200 mm
(8 in)
400 mm
(16 in)
200 mm
(8 in)
400 mm
(16 in)
200 mm
(8 in)
400 mm
(16 in)
200 mm
(8 in)

Technical Description 13
Mounting Location
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EnglishDeutsch
The inverter can be installed vertical or horizontal.
For horizontal outdoor installation, mount the inverter
at an angle of 10° (or greater).
Fig. 8: Vertical and horizontal installation (decentral)
Fig. 9: Vertical and horizontal installation (central)
3.5 Mounting Location
Fig. 10: Installation recommendation for protection against
direct sunlight and rain
170 mm
(7 in)
400 mm
(16 in)
min. 10°
300 mm
(12 in)
300 mm
115 mm (5 in)
(12 in)
400 mm
(16 in)
min. 10°

Technical Description14
Dimensions
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3.6 Dimensions
Fig. 11: Dimensions inverter with decentral ConnectionBox
Fig. 12: Dimensions inverter with central ConnectionBox
3.7 Functionality of the Inverter
The REFUsol 100K converts the DC voltage generated
by the photovoltaic modules into AC voltage and feeds
it into the low or medium voltage grid.
321 mm
163 mm
593 mm
484 mm
407 mm
116
1007 mm
965 mm 904 mm
116
407 mm
673 mm
760 mm
321 mm
163 mm
484 mm
407 mm
116
692 mm 650 mm 593 mm
116
407 mm
673 mm
760 mm

Technical Description 15
Requirements for the Infrastructure
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Fig. 13: Grid-connected PV system with photovoltaic inverter
3.8 Requirements for the Infrastructure
The following points are to be considered when
planning the infrastructure:
∘The REFUsol 100K can feed into the low-voltage grid
and the medium-voltage grid.
∘The power supply line must be equipped with an ap-
propriate AC disconnecting device.
∘The REFUsol 100K is not equipped with internal po-
tential isolation.
∘If connected with the medium-voltage-grid, it must
be operated with electrically isolating transfor-
mers.
∘The transfomer must be selected according to the
specific site of use and the relevant regulations
must be taken into account: Hazardous substances
1Photovoltaik (PV) modules
2Solar string combiner box
3Photovoltaic inverter
4AC protection (fuse switch disconnector or circuit breaker)
5Grid protection
6Isolation transformer is required for medium-voltage grid
7Low or medium-voltage AC grid
Additional required
equipment
at low voltage
network
at medium vol-
tage network
DC load break switch integrated1) integrated1)
AC load break switch necessary necessary
Central grid protecti-
on device with section
switch
(VDE-AR-N 4105,
VDE-AR-N 4110)
necessary necessary
LV-/MV-Transformer not necessary necessary
1) Local regulation might require an additional DC switch at a external DC
combiner box.

Installation16
General Warnings
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ordinance, ordinance on installations for handling
substances hazardous to water, chemicals prohibi-
tion ordinance, technical instructions for noise pro-
tection, and regional building regulations.
4 Installation
4.1 General Warnings
Specification of medium voltage transformer
Mains transformer according to EN 50588-1
Switching group Dyn5 or Dyn11
DANGER
High voltage
Danger to life due to electric shock.
The product operates at high voltages:
▸All work on the product must be carried out
by electrically qualified persons only.
▸If the inverter is tilted forward on rainy or
snowy days or the connection box is opened,
take suitable protective measures to prevent
water from entering the connection box. If it
is not possible to take protective measures,
do not tilt the inverter forward or open the
connection box.

Installation 17
Auxiliary Means and Tools
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EnglishDeutsch
4.2 Auxiliary Means and Tools
∘Wrench 13 mm
∘Wrench 16 mm
∘Wrench 18 mm
∘Slotted screwdriver 10 mm
∘Lockout-tagout kit
∘Voltage tester
∘Spirit level
4.3 Unpacking the ConnectionBox
▷Open the packaging and remove the ConnectionBox
with the help of two people.
DANGER
High voltage
Danger to life due to high voltages that can
cause lethal electric shocks are present in the
live components of the inverter.
▸Always disconnect the inverter from voltage
sources before performing any work on it.
▸Observe a waiting time of 2 minutes.
DANGER
High voltage
Danger to life due live parts can remain ener-
gized after isolation.
▸Disconnect electrical systems according to
the 5 safety rules (see chapter 2.7).
CAUTION
Hot surfaces
Risk of burns due to hot surfaces.
The product can get hot during operation.
▸Avoid contact during operation.
▸Allow the product to cool down sufficiently
before carrying out any work.

Installation18
Mounting the ConnectionBox
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4.4 Mounting the ConnectionBox
There are three possibilities for mounting the Con-
nectionBox. Pole mounting with two suitable pole
clamps, wall mounting, or horizontal mounting with an
angle of 10° (or greater).
The fixing material is not included in the scope of deliv-
ery.
4.4.1 Mounting the ConnectionBox Vertically
✅Requirements according to IEC 60364-7-712 for
special systems or locations for photovoltaic power
supply systems were considered in the planning.
1. Mark the drill holes according to the following dra-
wing.
Fig. 14: Mounting dimensions
2. Drill the holes and insert anchors.
3. Screw screws with a minimum diameter of 8 mm
into the upper plugs at a distance of 8 mm from the
mounting surface.
4. Hook the ConnectionBox into the two upper screws
and press it against the wall.
5. Screw the lower screws into the dowels.
6. Tighten all screws.
Central ConnectionBox
Decentral ConnectionBox
407 mm
(16 in)
407 mm
(16 in)
4x M10
4x M10
965 mm
(38 in)
650 mm
(25.6 in)

Installation 19
Wiring DC and AC Cables (Central ConnectionBox)
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EnglishDeutsch
4.4.2 Mounting the ConnectionBox Horizontally
✅Requirements according to IEC 60364-7-712 for
special systems or locations for photovoltaic power
supply systems were considered in the planning.
1. Mount the mounting rails as shown in Figure 14.
Ensure that the ConnectionBox has an angle of at
least 10°.
a) Maintain a distance of at least 300 mm from the
floor in the connection area (see Figure 8/9).
b)To obtain a 10° angle, the distance from the top of
the ConnectionBox to the floor is 415 mm for the
central ConnectionBox and 470 mm for the
decentral ConnectionBox.
2. Insert screws with a minimum diameter of 8 mm
into the mounting rails.
3. Lift the ConnectionBox with two people and hook it
into the two upper screws.
4. Screw on the two upper screws with counter nuts by
hand.
5. Lift the ConnectionBox with two persons at the bot-
tom and hook it into the two lower screws.
6. Screw on the lower screws with counter nuts by
hand.
7. Tighten all screws.
4.4.3 Mounting the ConnectionBox on a Pole
✅Requirements according to IEC 60364-7-712 for
special systems or locations for photovoltaic power
supply systems were considered in the planning.
✅Two mounting bridges, round steel clamps or
mounting rails each permissible for the weight are
provided for the mast mounting.
▷Fixing takes place according to the procedure
described in the previous chapters.
4.5 Wiring DC and AC Cables (Central Connec-
tionBox)
Tab. 2: Stud connection
Type DC Terminal AC Terminal
2 x cable lugs DIN 46234 10 … 185 mm² 6 … 120 mm²
2 x cable lugs DIN 46235 25 … 185 mm² 16 … 120 mm²
Cable lug to DIN 46234 10 … 240 mm² 6 … 150 mm²

Installation20
Wiring AC Cables (Decentral ConnectionBox)
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1. Prepare the cables, grounding cables and insert it
through the cable glands.
2. Connect the PE conductor.
3. Connect the three AC conductors.
4. If an N conductor is present, isolate the N conductor
and place it securely in the ConnectionBox pro-
tected against contact.
5. Tighten the union nut of the cable gland to ensure
tightness and strain relief.
6. Connect the potential equalization conductor with
ring cable lug to the PE threaded bolt (M8).
Fig. 15: Potential equalization (Central ConnectionBox)
7. Insert the DC cables through the cable glands and
connect them to the terminals.
8. Tighten the union nut of the cable gland to ensure
tightness and strain relief.
4.6 Wiring AC Cables (Decentral Connection-
Box)
Fig. 16: AC connection area: Cable grommet
Cable lug to DIN 46235 25 … 240 mm² 16 … 150 mm²
Stud size for spade connection M12 M10
Tightening torque 14 … 31 Nm 10 … 20 Nm
Stud size for potential
equalization M8
Minimum cross section for the
potential equalization 6 mm²
Tab. 2: Stud connection
DC+ DC- L1 L2 L3