Une ZHERO User manual

UNE ZHERO
MANUAL
Ver. 0.1
UNE SRL - VIA MODENA 48/E –42015 CORREGGIO (RE) - ITALY - VAT No. 02513460358 -
T.+39 0522 693566 - F. [phone] - [e-mail] –https://www.unesrl.com

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Summary
1. INFORMATION ABOUT THIS DOCUMENT................................................................................................................4
1.1. Scope ...............................................................................................................................................................4
1.2. Warranty and supply conditions........................................................................................................................5
1.3. Symbols used ...................................................................................................................................................6
1.4. Symbols affixed to the frame of UNE ZHERO ...................................................................................................7
1.5. Glossary and definitions ...................................................................................................................................8
1.6. Recipient qualifications ..................................................................................................................................11
2. CONDITIONS OF USE .............................................................................................................................................13
2.1. Limitations on use ..........................................................................................................................................13
3. UNE ZHERO CHARACTERISTICS ...........................................................................................................................15
3.1. Overview.........................................................................................................................................................15
3.2. Wiring Diagram ...............................................................................................................................................19
3.3. Technical data ................................................................................................................................................19
3.4. UNE ZHERO nameplate...................................................................................................................................19
4. SAFETY WARNINGS...............................................................................................................................................20
4.1. General information........................................................................................................................................20
4.2. Personal protection ........................................................................................................................................23
4.3. System............................................................................................................................................................24
4.4. Residual risks .................................................................................................................................................26
4.5. Hazard reporting.............................................................................................................................................26
5. INSTALLATION ......................................................................................................................................................27
5.1. Lifting and transport .......................................................................................................................................27
5.2. Tools required for installation.........................................................................................................................29
5.3. Environmental and general installation conditions .........................................................................................30
5.4. UNE ZHERO Positioning .................................................................................................................................31
5.5. Unpacking.......................................................................................................................................................32
5.6. Preliminary operations before proceeding to electrical connection................................................................33
5.7. General connection diagram of the machine ..................................................................................................38
5.8. Internal overview and overview of the ZHERO panel.......................................................................................42
5.9. Connection description...................................................................................................................................44
5.9.1. UNE ZHERO connection to the photovoltaic generator............................................................................44
5.9.2. Installing or changing the batteries .........................................................................................................47
5.9.3. UNE ZHERO - AC Connection to the Distributor grid/Genset –“Backup” .................................................50
5.9.4. Connecting the production meter ............................................................................................................54
5.9.5. Meters connection...................................................................................................................................56

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5.9.6. Internet connection .................................................................................................................................70
6. STARTING THE MACHINE .....................................................................................................................................72
6.1. Turning the system on ....................................................................................................................................72
6.2. Checking the correct operation of the system ................................................................................................74
6.2.1. ZHERO Installer Tool ...............................................................................................................................75
7. SYSTEM OPERATION.............................................................................................................................................76
7.1. Recommendations for optimal Monofase use................................................................................................76
7.2. Monitoring ......................................................................................................................................................78
7.2.1. Webserver ...............................................................................................................................................78
7.2.2. Webapp ...................................................................................................................................................87
7.3. UNE ZHERO functions ....................................................................................................................................98
7.3.1. “Monofase” function................................................................................................................................98
7.3.2. "Cyclic load" function...............................................................................................................................98
7.3.3. "Charge hysteresis" function....................................................................................................................98
7.3.4. Photovoltaic energy management...........................................................................................................99
7.3.5. Blackout ..................................................................................................................................................99
7.3.6. Power ramp .............................................................................................................................................99
7.3.7. Warmup, battery charging and discharging ...........................................................................................100
7.3.8. System in stand-by ................................................................................................................................100
7.3.9. Off-Grid operation..................................................................................................................................101
7.3.10. Retrofit –Ibrido operation..................................................................................................................101
7.4. Security checks ............................................................................................................................................102
7.4.1. Insulation test........................................................................................................................................102
7.4.2. Differential circuit breaker of the machine.............................................................................................103
8. WHAT TO DO IN THE EVENT OF A FAILURE OR ERROR.......................................................................................104
8.1. Indication of anomaly ...................................................................................................................................104
8.2. Most common anomalies.............................................................................................................................106
8.2.1. Low insulation resistance......................................................................................................................106
8.2.2. String error ............................................................................................................................................107
8.2.3. Battery error...........................................................................................................................................107
8.2.4. Controller error ......................................................................................................................................108
8.2.5. Inverter error..........................................................................................................................................108
8.2.6. Ethernet communication error...............................................................................................................109
8.2.7. System bypass ......................................................................................................................................111
8.2.8. Breakdown of differential magnetothermic on board-machine .............................................................111
8.2.9. Failure to connect to the distributor / generator network ......................................................................112
9. TECHNICAL SUPPORT.........................................................................................................................................113

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10. MAINTENANCE AND UPDATE..........................................................................................................................114
10.1. Batteries maintenance ..............................................................................................................................115
10.2. Controller maintenance.............................................................................................................................117
10.3. Inverter maintenance ................................................................................................................................118
10.4. System update ..........................................................................................................................................119
11. DISPOSAL ........................................................................................................................................................121
12. ANNEXES .........................................................................................................................................................122
System alarm and error table ..................................................................................................................................123
MANUALS ATTACHED TO UNE ZHERO ......................................................................................................................128

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1. INFORMATION ABOUT THIS DOCUMENT
Installer
Maintenance
technician
User
This manual contains important safety instructions that must be followed when using UNE ZHERO.
The original language of this document is Italian; in case of inconsistencies or doubts, please request the original
document from UNE srl.
These instructions for use are intended for all UNE ZHERO installers, maintenance technicians and users, with the
purpose of providing guidance for the correct use of the system in order to render it as efficient as possible.
These instructions are an integral part of UNE ZHERO; the product cannot be supplied without this document since
it must be available at all times to those who use the equipment.
Please keep in mind that UNE ZHERO can be used only by those who have read and understood this manual in its
entirety; if in doubt, please contact your supplier for clarification.
UNE srl shall not be liable for any damage to persons and/or property as a result of operations conducted on the
system in a manner other than that indicated in this manual.
For information on how to install UNE ZHERO, please refer to the instructions supplied with the equipment.
1.1. Scope
Installer
Maintenance
technician
User
These instructions for the installation, maintenance and use of UNE ZHERO apply to all firmware versions.
You can find the firmware version of your device in your dedicated section on www.portal.zherosystem.com
or in the info section of the webapp installed on your smartphone/tablet.
This product can be used only within its intended scope, i.e. only in residential, commercial and light industrial
applications, in 230V (single-phase) 50 Hz TT and TN-S (electricity distribution networks).
For further information and questions, please contact UNE srl via the channels shown in the contact section.

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1.2. Warranty and supply conditions
Installer
Maintenance
technician
User
The warranty conditions can be found in a dedicated document supplied with the equipment; in particular, the
warranty conditions are valid only if:
•The installer and the maintenance technician respect the instructions in this manual;
•NO unauthorised operations or operations that are inconsistent with this document are performed on UNE
ZHERO;
•Any “open casing” operations to be performed on UNE ZHERO are conducted only by authorised staff;
•NO changes are made to UNE ZHERO.
UNE srl shall NOT be held liable for any defect or malfunction resulting from improper use of the equipment;
from transport damage or damage due to environmental conditions; from lack of or inadequate maintenance;
from tampering or poor repair work; from installation or maintenance performed by unauthorised persons.
Also, UNE srl disclaims all liability for damage in the event of failure to comply with the Monofase for proper
installation in force in the country where the machine is installed.

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1.3. Symbols used
Installer
Maintenance
technician
User
This symbol indicates a danger.
Failure to comply with the information marked with this symbol may result in a fatal
danger and cause damage to the device.
This symbol indicates caution.
Failure to comply with the information marked with this symbol may hinder the correct
execution of the work phases and prevent the optimal operation of the device.
This symbol indicates careful reading.
The recommendations marked with this symbol may facilitate the use of UNE ZHERO
and improve its performance, depending on its place of installation.
This symbol indicates an example.
Here you will find other examples of concrete circumstances.
This symbol marks a chapter intended to be read by the installers of UNE ZHERO.
This symbol marks a chapter intended to be read by the maintenance technicians of
UNE ZHERO.
This symbol marks a chapter intended to be read by the end user of UNE ZHERO.

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1.4. Symbols affixed to the frame of UNE ZHERO
Installer
Maintenance
technician
User
This symbol indicates an obligation to read the manual carefully before installing
or starting using UNE ZHERO.
This symbol warns the operator about the presence of electrical hazards inside the
system.
This symbol prohibits the use of water to extinguish fires.
This symbol represents the operating range of the system; for UNE ZHERO it
extends from -10 to + 40 °C.
This symbol indicates a danger of electric shock; before carrying out any other
operation, turn off the device and wait for the indicated time before proceeding.
This symbol indicates the degree of electrical protection of UNE ZHERO.
This symbol warns the operator about the presence of hazards associated with
hot surfaces inside the system.
This symbol indicates that the operator must consult the manual supplied with the
device.
The device contains a toroidal transformer.

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1.5. Glossary and definitions
Installer
Maintenance
technician
User
The terms used throughout this document are common; please refer to the definitions below:
Glossary
ELECTRICAL DEVICE
An object that absorbs electricity as part of its normal operation.
BMS
Battery Management System.
DIRECT CURRENT
Type of current produced by the photovoltaic modules, used to power the batteries.
ALTERNATING CURRENT
Type of output current produced by the inverter, which can be used in Monofase power
grids.
DEALER
Your UNE ZHERO supplier.
FIRMWARE
The firmware is a program, a sequence of instructions, built directly into an electronic
component, in the broadest sense of the term (integrated circuits, electronic boards,
peripheral devices). Its purpose is to start the component and enable it to interact with
other hardware components by implementing communication protocols or
programming interfaces.
INSTALLER
The person who, after appropriate training, has the skills and the ability to work on UNE
ZHERO.
INVERTER
An inverter is an electronic equipment that converts direct current into alternating
current.
RADIATION
In thermodynamics and electromagnetism, radiation means the transfer of energy
between two bodies by means of electromagnetic waves; e.g. the sunlight that arrives
at the surface of the photovoltaic modules.
LED
In electronics,a light-emitting diode (LED) is an optoelectronic device that uses the
optical properties of some semiconductor materials to generate light.
IΔn
Leakage current used by the residual current device
PHOTOVOLTAIC
GENERATOR
An assembly of suitably connected photovoltaic modules that provides energy to your
system.
LOCAL GRID OPERATOR
The local grid operator is the legal entity that manages the electricity distribution
network at the place of reference.
OFF-GRID SYSTEM
(STAND-ALONE)
System completely independent of the national power grid, not in parallel with the power
grid of the local distributor.
GRID-CONNECTED
SYSTEM
Traditional photovoltaic system, in parallel with the power grid of the local distributor.
ROUTINE
MAINTENANCE
System inspection intended to check its condition and restore its original operating
conditions and performance. Routine maintenance is conducted at specific intervals.
EXTRAORDINARY
MAINTENANCE
Work intended to restore the condition of the system following a malfunction or
performance degradation.
PHOTOVOLTAIC MODULE
A photovoltaic module is an optoelectronic device consisting of photovoltaic cells, able
to convert the sunlight to which it is exposed into electricity by means of the photovoltaic
effect; photovoltaic modules are usually used as current generators in photovoltaic
systems.

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MPPT
MAXIMUM POWER POINT TRACKER is an algorithm that optimises the energy input
from the modules by attempting to adapt the generator to the load by varying the
voltage/current ratio in such a way that the operating point corresponds to the maximum
power point.
PARALLEL WITH THE
POWER GRID
Condition under which a system can supply the produced energy to the grid of the local
grid operator.
AVAILABLE POWER
The amount of power that the system can deliver at the same time.
SPD
Surge protection device.
STANDBY
The standby mode is that condition under which electric/electronic devices do not
operate but are ready to switch from the temporary deactivated state to the operating
state.
USER
Subject who benefits from the services offered by UNE ZHERO.
BACKUP
Function that allows in case of a blackout by the distributor network to keep one or more
lines in your home powered.
WORKING MODE
UNE ZHERO working mode; depending on its programming, it can be Off-Grid, On-Grid
with backup.
PROTECTION INTERFACE
System for disconnecting the photovoltaic system in the event of network anomalies
(SPI or NS protection).
RETROFIT
Installation of a storage system, in the electrical system, capable of charging its
batteries from a pre-existing external photovoltaic generator.
EXCHANGE COUNTER
Bidirectional energy meter, installed by the electricity service provider, capable of
measuring the energy withdrawn and sold on the network.
PRODUCTION COUNTER
Bidirectional energy meter, installed by the electricity service provider, capable of
measuring the energy produced by the photovoltaic plant.
EXCHANGE METER
Bidirectional energy meter, provided by UNE, capable of measuring the energy
withdrawn and sold on the network.
PRODUCTION METER
Bidirectional energy meter, provided by UNE, capable of measuring the energy produced
by the photovoltaic plant.

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Definitions
EXPANSION
A system is considered expanded when at least one circuit is added
INSTALLATION
Installation means the construction of a system from scratch or the complete
reconstruction of an existing system.
TRANSFORMATION
An electrical system is considered transformed if subjected to significant changes,
such as an increase in power.
ROUTINE MAINTENANCE
Routine maintenance encompasses all maintenance operations intended to prevent
excessive wear and tear and address accidental events that can be solved by
performing operations that do not involve changing the structure of the system, in
accordance with the technical Monofase in force, the user manual and the
maintenance manual provided by the manufacturer.
EXTRAORDINARY
MAINTENANCE
Extraordinary maintenance encompasses all maintenance operations that do not fall
within installation, transformation, expansion or routine maintenance, such as
replacing a part with another one with different characteristics.
SOLID —MUNICIPAL
WASTE
This category includes all the waste resulting from human activities such as paper,
rags, plastic, cans, bottles, etc.
SPECIAL WASTE
This category includes all the waste resulting from the processing industry, from
craftwork or agricultural activities that, due to its quantity and quality cannot be
assimilated to municipal waste.
HARMFUL TOXIC WASTE
This category includes all toxic or harmful wastes, which are contaminated.
DISPOSAL
Discarding a product at the end of its life.

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1.6. Recipient qualifications
Installer
Installation, commissioning, and maintenance shall be carried out only by qualified staff.
Qualified staff means staff considered fit to work on live electrical systems, in accordance with the Monofase
in force in the country where the device is installed, (e.g. PEI (authorised person) in the European Community)
and that has received an UNE ZHERO authorised installer certificate form UNE srl.
To receive the authorisation from UNE srl, the staff must attend a special theoretical and practical training
course that ends with an exam intended to demonstrate their skills and knowledge with regard to the structure
of the unit.
Prior to the commissioning of UNE ZHERO, the installer shall provide the user with all the information necessary
for its proper use, including:
•Instructions about the hazards associated with the use of electrical devices;
•Instructions on how to use an Off-Grid system;
•Instructions on the safe use of batteries;
•Instructions on how to turn off and disconnect the system safely in the event of a failure;
•Instructions on how to put the Off-Grid system in safe mode to prevent its reconnection;
•Instructions on how to perform the maintenance and cleaning operations under his/her responsibility;
•The requirement to know and observe the instructions for use and all the safety warnings.
Maintenance
technician
Maintenance shall be conducted by qualified staff only.
Qualified staff means staff considered fit to work on live electrical systems, in accordance with the Standards
in force in the country where the device is installed, (e.g. PEI (authorised person) in the European Community)
and that has received an UNE ZHERO authorised installer certificate form UNE srl.
To receive the authorisation from UNE srl, the staff must attend a special theoretical and practical training
course that ends with an exam intended to demonstrate their skills and knowledge with regard to the structure
of the unit.
Maintenance technicians are required to carry out the intended maintenance operations with due care, in
compliance with the state-of-the-art Standards.
Access to UNE ZHERO is prohibited to persons with mitral valves or pacemakers and
to all those under the influence of alcohol or drugs.
The persons working on UNE ZHERO must wear the personal protective equipment
required by the laws in force in the country where the device is installed.

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User
Prior to the commissioning of UNE ZHERO, the users shall receive from the installer appropriate notions such
as:
•Instructions about the hazards associated with the use of electrical devices;
•Instructions on how to use an Off-Grid system;
•Instructions on the safe use of batteries;
•Instructions on how to turn off and disconnect the system safely in the event of a failure;
•Instructions on how to put the Off-Grid system in safe mode to prevent its reconnection;
•Instructions on how to perform the maintenance and cleaning operations under his/her responsibility;
•The requirement to know and observe the instructions for use and all the safety warnings;
Access to UNE ZHERO is prohibited to persons with mitral valves or pacemakers and
to all those under the influence of alcohol or drugs.
The persons working on UNE ZHERO must wear the personal protective equipment
required by the laws in force in the country where the device is installed.
The customer must always verify that the installer is authorised by UNE srl; only
staff whose training is verified can be considered expert and reliable for the
installation and maintenance UNE ZHERO, aware and mature for the tasks
described and able to correctly interpret the instructions in this manual.
The customer is responsible for checking the mental and physical condition of those
who have access to UNE ZHERO.
The use of the equipment in a manner other than that intended is forbidden.

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2. CONDITIONS OF USE
Installer
Maintenance
technician
User
2.1. Limitations on use
Installer
Maintenance
technician
User
UNE ZHERO is a complete electricity production-storage-smart management system that can be used in
different configurations, depending on the needs of the user; the configurations available are described in
section 3.1. The goal is to enable the customer to achieve energy independence by producing energy from
renewable resources, storing it and managing it in an intelligent manner, in such a way as to allow a conscious
and efficient use thereof. UNE ZHERO is intended for use in residential, commercial and industrial environments,
in 230V (single phase) –50 Hz TT and TN-S. UNE ZHERO is designed to collect the direct current produced by
a suitably sized photovoltaic system, store it and convert it, when needed, into alternating current, which can be
used by the appliance.
Any other use is considered improper or dangerous.
Moreover:
•UNE ZHERO cannot be used with photovoltaic modules that require grounding one of the poles.
•External batteries not authorised by UNE srl cannot be connected to the system.
•UNE ZHERO can be used only if all the technical specifications reported in the technical data sheet are met.
•UNE ZHERO can be used only indoors, in environments suitable for IP20 equipment; do not install the device
in inadequate environments or subjected to adverse weather conditions.
•Do not install the device in environments that present risks of explosion or fire.
•Do not install the device in places with special flammability conditions.
•Do not store materials near UNE ZHERO, especially if flammable and/or explosive.
•Do not connect devices outside the indicated limitations on use.
•Do not use the equipment if any of its safety devices is missing, not working or disabled.
•Do not use the protectors built into UNE ZHERO as primary protection of the user system.
The use of the equipment in a manner other than that intended is forbidden.
When using the system in parallel with the local distributor's power grid, please
observe the technical and bureaucratic procedures requested by the regulations in
force in the country where the device is installed.

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•Do not use UNE ZHERO without making the necessary ground connections.
•Changing the operating parameters of UNE ZHERO is forbidden; every change must be agreed upon with
the local distributor, in compliance with the laws, especially in the case of On-Grid systems.
•Do not use corrosive cleaning products or that generate electrostatic charges.
•Do not use the equipment without reading and fully understanding the manuals.
•Do not obstruct the ventilation system.
•Do not use UNE ZHERO as a UPS since it is not certified for such use.
•Do not use UNE ZHERO to power life-support medical devices.
•The system is PDII certified (indoor, conditioned), this means that the installation environment must be dry
and condensate-free.
Please contact your supplier for more information.

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3. UNE ZHERO CHARACTERISTICS
Installer
Maintenance
technician
User
3.1. Overview
Installer
Maintenance
technician
User
UNE ZHERO is a complete system designed to enable the customer to achieve energy independence by
producing energy from renewable resources, storing it and managing it in an intelligent manner, in such a way
as to allow a conscious and efficient use thereof.
Once correctly sized according to your needs and installed, UNE ZHERO will provide the necessary energy to
the electrical appliances.
UNE ZHERO can work in different modes depending on the requirements of the customer and of the place of
installation; some of the working modes are not available in some countries.

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UNE ZHERO Monofase
-Internal controller MPPT;
-External grid inverter not supported;
-UNE Internal inverter;
-Exchange meter;
-No production meter;
-Backup line;
-External line without backup;
-Grid connection.
UNE ZHERO Off-Grid
-Internal controller MPPT;
-External grid inverter not supported;
-UNE internal inverter;
-No exchange meter;
-No production meter;
-Backup line;
-No External line without backup;
-Gen-set connection.
UNE ZHERO Retrofit
-No internal controller MPPT;
-External grid inverter supported;
-Une internal inverter;
-Exchange meter;
-Production meter;
-Backup line;
-External line without backup;
-Grid connection.
UNE ZHERO Ibrido
-Internal controller MPPT;
-External grid inverter supported;
-UNE internal inverter;
-Exchange meter;
-Production meter;
-Backup line;
-External line without backup;
-Grid connection.

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On-Grid with backup function:
The system operates in parallel with the existing public grid to which the user is connected; the user will,
therefore, become a prosumer.
If UNE ZHERO Monofase or Ibrido
Since the device operates in parallel with the grid, the power available to the user will be given by the
sum between the energy provided by UNE ZHERO (that varies depending on the availability of the
photovoltaic module and of the battery and can reach a maximum of 6 kW) and the power provided by
the distributor.
If UNE ZHERO Retrofit
The system works by inserting in parallel an existing public network and an external photovoltaic
system, to which the user.
Being certified in "0 injection", the power of the plant should not be added to that of the existing
photovoltaic system.
A wise use of the system, combined with the correct sizing of the generator, may limit the use of power from
the grid to a minimum, further reducing the operating costs.
In the event of a distributor black-out, the system switches automatically and dynamically to BACKUP mode to
keep the appliances powered until the batteries run out or the power supply from the local distributor is restored.
In the latter case, the system will resume normal On-Grid operation.
UNE ZHERO comes with a transfer-to-grid feature that can be enabled in accordance with the local regulations
in force in each country; this function allows transferring the excess energy produced by the photovoltaic
system to the grid.
ATTENTION: before installing UNE ZHERO Hybrid or Retrofit system, make sure that
its functioning is complant with the country and place of installation; UNE assumes
no responsibility for the place and method of connection.
If the system uses a protection interface, it may cause brief disruptions caused by it
on the “backup”line.
Carefully read section 7.1 and observe the recommendations therein to optimise the
use of the system.
In the backup working mode, the use of particularly high energy-consuming
appliances may cause the system to malfunction or increase its operating costs.
Contact your supplier to check the suitability of use of particular appliances.

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Off-Grid:
UNE ZHERO operates independently of any external power grid; it creates its own grid, and all the appliances
will be fed exclusively from it.
Since there is no other power grid working in parallel with UNE ZHERO, the only power available to the user is
that provided by UNE ZHERO (the amount of power available varies depending on the availability of the
photovoltaic module and of the battery and can reach a maximum of 6 kW).
If the system consumes all the energy made available, an emergency source (if connected) or a public grid (if
connected, it must be allowed by local regulations) is automatically activated.
The benefits of using UNE ZHERO are:
•Complete energy management system;
•Increased self-consumption for higher energy independence;
•Less affected by energy price variations;
•Smart operating logic;
•Ideal for buildings designed to have electricity as the only source of energy (heat pump heating, induction
hobs, etc);
•Extremely low environmental impact.

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3.2. Wiring Diagram
Installer
Maintenance
technician
User
The wiring diagram and the corresponding connection terminal block are described in cap. 5.7
3.3. Technical data
Installer
Maintenance
technician
User
The technical data of UNE ZHERO can be found in the technical datasheet.
3.4. UNE ZHERO nameplate
Installer
Maintenance
technician
User
Figure 1 - UNE ZHERO nameplate