ZUCCHETTI 50000TL User Manual
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ZUCCHETTI 50000TL User Manual

Grid-connected inverter
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Grid-connected inverter
50K – 70K TL
User Manual
V1.1 (07-06-2019)
Zucchetti Centro Sistemi S.p.A. - Green Innovation Division
Via Lungarno, 248 - 52028 Terranuova Bracciolini - Arezzo, Italy
tel. +39 055 91971 - fax. +39 055 9197515
innovation@zcscompany.com - zcs@pec.it – www.zcsazzurro.com
Reg. Pile IT12110P00002965 - Capitale Sociale € 100.000,00 I.V.
Reg. Impr. AR n.03225010481 - REA AR - 94189
Azienda Certificata ISO 9001 - Certificato n. 9151 - CNS0 - IT-17778

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  • Page 1 50K – 70K TL User Manual V1.1 (07-06-2019) Zucchetti Centro Sistemi S.p.A. - Green Innovation Division Via Lungarno, 248 - 52028 Terranuova Bracciolini - Arezzo, Italy tel. +39 055 91971 - fax. +39 055 9197515 innovation@zcscompany.com - zcs@pec.it – www.zcsazzurro.com Reg.

  • Page 2: Table Of Contents

    Table of Contents 1. Preliminary safety instructions………………………………………...…….…………………………………………………………….6 1.1. Safety instructions…..………………………………………………………..…………………………………………..………………..6 1.2. Symbols and icons……………………………………………………………….…………………………………………………………9 2. Product features……………….……………………………………………………….………….……………………………………………10 2.1. Product overview……….…………………………………………………...…………………………………….……………………..10 2.2. Description of functions……………………………………………………………………………………….……………………..15 2.3. Module protection………………………………………………………………..………………………………………………………18 2.4. Efficiency and derating curves.…………………………………………………………………………….……………………….18 3. Installation..………………………………………………………………………………………………………………………………………20 3.1. Installation procedure…………………………………………………………………...…………………….………………………21 3.2. Checks before installation…………………………………………………………………………………………………………….21 3.3.
  • Page 3 7. Troubleshooting and maintenance………………………………………………………………………………………..…………..66 7.1. Troubleshooting…………………………………………………………………………………….…………………………………….66 7.2. Maintenance..…………………………………………………………………………………………...………………………………….74 8. Uninstalling…………………………………………………………………………………….……………...………………………………….75 8.1. Steps for uninstalling the inverter…………………………………………………………………………………………………75 8.2. Packaging…………………………………………………………………………………………………………………………………….75 8.3. Storage…..………………………………………………………………………………………………………………….………………...75 8.4. Disposal…….………………………………………………………………………..…………………………………….…………………75 9. Technical specifications.……………………………..………………………………………………………………………..……………..76 10. Warranty……………..………………………………………………………………………………………………………………..……………78 3 / 80 Manual of 07/06/2019 Rev. 1.1“User Manual for 50K-70K TL” Identificazione: MD-AL-GI-00 Rev.
  • Page 4 Copyright statement The copyright of this manual belongs to Zucchetti Centro Sistemi S.p.A. No part of this manual may be copied (including the software), reproduced or distributed in any form or by any means without the permission of Zucchetti Centro Sistemi S.p.A.
  • Page 5  Scope This manual describes the assembly, installation, electrical connections, commissioning, maintenance and troubleshooting of the following inverters: 50000TL / 60000TL / 70000TL Keep this manual so that it is accessible at all times.  Recipients...

  • Page 6: Preliminary Safety Instructions

    For safety reasons, this inverter can only be installed by a qualified electrician with the necessary training and/or skills and knowledge. Zucchetti Centro Sistemi S.p.A. declines all responsibility for damage to property or personal injury caused by incorrect use of the device.
  • Page 7 If necessary, request assistance from an installer of photovoltaic systems or from Zucchetti Centro Sistemi SpA. Transport of the equipment, especially by road, must be carried out with vehicles suitable to protect the components (in particular, electronic parts) against violent knocks, humidity, vibrations, etc.
  • Page 8 For any repairs, contact your local authorised service centre;  Do not disassemble the internal components of the inverter without permission. This will void the warranty. Zucchetti Centro Sistemi S.p.A. shall not be responsible for any damage or loss caused by these actions.

  • Page 9: Symbols And Icons

    1.2. Symbols and icons Safety symbols Pay attention to possible burns due to hot parts. Only touch the screen or press the keys while the inverter is in operation. Caution The PV strings should be connected to the ground in accordance with the local regulations! To ensure the safety of the system and people, the inverter and •...

  • Page 10: Product Features

    Read this manual before installing the inverter. Indication of the allowable temperature range Degree of protection of the equipment according to the IEC 70-1 standard (EN 60529 June 1997). Positive pole and negative pole of the input voltage (DC). 2. Product features General information in this chapter Product overview The field of use and overall dimensions of the 50K-70K TL inverters are indicated in this section.
  • Page 11 The 50K-70K TL inverters can only be used with photovoltaic modules that do not require one of the poles to be grounded. The operating current and voltage during normal operation must not exceed the limits indicated in the technical specifications. Only photovoltaic modules can be connected to the input of the inverter (do not connect batteries or other power supply sources).
  • Page 12 Inverter components  Inverter models of the 50K-70K TL family are divided into three sizes according to their maximum output power (50 kW, 60 kW, 70 kW).  Inverters with the same output power differ according to the characteristics of the wiring box. Wiring box 2 can have two configurations, indicated by the letters SX (where X=4.5).
  • Page 13 1. Communication board 2. AC output connectors 1. AC surge arrester (II) 13 / 80 Manual of 07/06/2019 Rev. 1.1“User Manual for 50K-70K TL” Identificazione: MD-AL-GI-00 Rev. 4.0 del 31.01.18 - Applicazione: GID...
  • Page 14 The inverter model must be chosen by a qualified technician who knows the installation conditions, the  devices that will be installed outdoors and the possible integration with existing systems. Optional components of the inverter should be chosen by a qualified technician who is familiar with the ...

  • Page 15: Description Of Functions

    Figure 5 – Front, side and back view of the inverter and bracket Labels on the inverter  Figure 6 – Do not remove the label on the side of the inverter 2.2. Description of functions The DC voltage generated by the PV modules is filtered through the input board before entering the power board.
  • Page 16 Operating principles  The control board of the strings measures the input current and voltage, analyses the functioning state of each PV string, and if anomalies are found on the strings, alerts the user to perform the relative control and maintenance operations. ...
  • Page 17 Figure 7 – Block diagram of the 50K-70K TL inverters Inverter functions A. Configurable relay The inverter has a configurable switching relay that can be used in various operating conditions (set in the menu). For example, it can close normally open contacts when an alarm occurs. B.

  • Page 18: Module Protection

    B.2 Feeding reactive power into the grid The inverter is capable of generating reactive power and can then feed it into the grid by setting the Power Factor. The feed-in management can be controlled directly by the network operator via a dedicated RS485 serial interface.

  • Page 19: Efficiency And Derating Curves

    C. Grid monitoring Continuous monitoring of the grid voltage to ensure that the voltage and frequency values stay within the operating limits. D. Internal protection of the inverter device The inverter has all kinds of internal protections to protect the device and internal components when abnormal situations occur on the grid or DC input line.

  • Page 20: Installation

    Figure 9 – Input power derating curve for an Azzurro ZCS 50K-70K TL inverter Output power (V) derating curve for an Azzurro ZCS 50K-70K TL inverter Figure 10 – Output power derating curve for an Azzurro ZCS 50K-70 TL inverter 3.

  • Page 21: Installation Procedure

    Installation notes:  DO NOT install the 50K-70K TL inverter near flammable materials.  DO NOT install the 50K-70K TL inverter in an area where flammable or explosive materials are stored. Danger The housing and heat sink may become very hot while the inverter is running, DO NOT install the inverter in places where they may be touched inadvertently.
  • Page 22 Figure 11 – Installation steps 3.2. Checks before installation Checking the outer packaging The packaging materials and components may be damaged during transportation. Therefore, please check the materials of the outer packaging before installing the inverter. Check the surface of the box for external damage such as holes or tears.

  • Page 23: Installation Tools

    1 user manual 8 M8x80 expansion plugs 1 warranty 1 certificate 10 A Stoppers for 50K TL 10 B Stoppers for 50K TL 12 A Stoppers for 60K TL 12 B Stoppers for 60K TL & 70K TL & 70K TL 3.3.
  • Page 24 To crimp the RJ45 connectors for RJ45 crimping tool the communication cables To insert the expansion plugs into Rubber hammer the wall holes To remove the DC connectors from MC4 removal tool the inverter Diagonal pliers To cut and tighten the cable ends To remove the outer sheath of the Wire stripping tool wires...

  • Page 25: Installation Position

    Level To make sure the bracket is level ESD gloves Protective clothing Safety goggles Protective clothing Protection mask Protective clothing 3.4. Installation position Choose an appropriate installation location for the inverter. Follow the requirements below to determine the installation position. 25 / 80 Manual of 07/06/2019 Rev.
  • Page 26 Figure 12 – Requirements for installing a single inverter Figure 13 – Requirements for installing multiple inverters Note: For safety reasons, ZCS Spa and/or its partners may not carry out any technical repairs or maintenance work, or move the inverter from and to the ground if it is installed at a height of more than 180 cm from the ground.

  • Page 27: Moving The 50K-70K Tl Inverter

    3.5. Moving the 50K-70K TL inverter This section describes how to move the inverter correctly 1) When opening the packaging, insert your hands into the slots on both sides of the inverter and take a hold of it as shown in Figures 14 and 15. Two people are needed to carry out this operation in order to ensure the safety of people and correct handling of the inverter.

  • Page 28: Installing The 50K-70K Tl

    3.6. Installing the 50K-70K TL inverter 1) Correctly position the mounting bracket on the wall using a level to ensure that it is straight; mark the eight holes using a suitable marker pen. Keeping the hammer drill perpendicular to the wall and avoiding any sudden movements when drilling, drill the eight holes at the points marked on the wall using a 8 mm drill bit.

  • Page 29: Electrical Connections

    4. Electrical connections General information in this chapter This chapter describes the electrical connections of the 50K-70K TL inverter. Carefully read this section before connecting the cables. Before making any electrical connections, make sure that the DC and AC circuit breakers are open. NOTE: Remember that the accumulated electrical charge remains in the inverter capacitor after the DC and AC circuit breakers have been switched off.

  • Page 30: Connecting The Pngd Ground Cable

    4.1. Electrical connections Figure 17 – Steps for connecting the cables 4.2. Connecting the PNGD cable Connect the 50K-70K TL inverter to the ground electrode using ground protection cables (PGND). The inverter does not have a transformer, therefore the positive and negative poles of the photovoltaic string does NOT need to be grounded.

  • Page 31: Connecting The Dc Input Power Cables

    Prepare the PGND cables to be connected (outdoor power cables with a cross-section of 8 mm recommended for grounding purposes); it is recommended to use yellow-green cables for better identification. Procedure: 1) Remove an adequate length of the external insulation layer using a wire stripper, as shown in Figure 18. Note: L2 is approximately 2-3 mm longer than L1 Figure 19 –...
  • Page 32 The setting method is described in section 6.3. Parallel mode: If the strings are connected in parallel, the input mode must be set to “parallel mode.” The setting method is described in section 6.3. Note Depending on the type of inverter, select the appropriate accessories (cables, fuse holder, fuse, switch, etc). The open-circuit voltage of the photovoltaic system must be lower than the maximum allowable DC input voltage of the inverter.
  • Page 33  Before connecting the power supply, be sure to disconnect the generator’s DC switch. When exposed to sunlight, the photovoltaic generator produces a voltage that can be dangerous!  Before connecting the power supply, make sure that the voltage of the DC cables is within the allowable operating range, below 60 V DC, and that the DC circuit breaker switch is open.
  • Page 34 Figure 20 – Positive (1) and Negative (2) MC4 connectors Note The positive and negative metal terminals are packed together with the positive and negative connectors respectively. Separate the positive and negative metal terminals after unpacking the inverter so as to avoid confusing the polarities.
  • Page 35 Figure 23 – Connecting the DC input power cables (2) 3) Insert the crimped power cables into the corresponding seats until you hear a “click” sound. At that point, the power cables will be snapped into place. 4) Replace the cable glands on the positive and negative connectors and rotate them against the insulation covers.

  • Page 36: Connecting The Ac Output Power Cables

    Figure 25 – Removing the DC connector 4.4. Connecting the AC output power cables Connect the inverter to the AC power distribution network or power grid using AC power cables.  Do not use the same AC circuit breaker for multiple inverters. ...
  • Page 37 Figure 26 – Do not connect loads between the inverter and circuit breaker Multi-core copper cables The cross-section of the power line must be sized in order to prevent unwanted disconnections of the inverter from the grid due to high impedance of the cable connecting the inverter to the point of supply.
  • Page 38 Figure 27 – Connecting the AC output cables (1) 2) Identify the suitable cable section as shown in the table and remove an appropriate length of the protective sheath, as shown in the figure. Then insert the AC output cable through the waterproof cable gland.

  • Page 39: Connecting The Communication Cables

    Figure 29– Connecting the AC output cables (3) 4) Secure the clamping cable gland by turning it clockwise; make sure that all the wires are securely connected 4.5. Connecting the communication cables The 50K-70L TL inverters have two communication interfaces: the RS485 interface and Wi-Fi interface (see figure below).
  • Page 40 For communication via the RS485 line, it is recommended to use AWG 24 shielded outdoor network cables with an internal resistance of less than or equal to 1.5 ohm/10m and external diameter between 4.5 mm and 7.5 mm. The RJ45 waterproof connector is made up of six parts: plug, screw nut, seals, housing, sealing plug and cable screw nut (see figure below).
  • Page 41 Figure 32 – Assembling the communication connector Crimp the plug using the RJ45 crimping tool. Insert the plug into the RS485 port on the inverter. Insert the cable seal in the lodging and tighten the nut. Figure 33 – Assembling the communication connector Removal procedure Remove the RJ45 connector from the inverter by removing the plug.
  • Page 42 2) Connect the external Wi-Fi module by inserting it into the appropriate slot. 3) Secure the external Wi-Fi module using the two screws supplied. Note: follow the appropriate procedure to configure the external Wi-Fi adapter. Description of the communication ports This section describes the functions of the RS485 and Wi-Fi ports.
  • Page 43 Note: in the case of a single inverter connected via RS485 or in the case of the last inverter in a daisy-chain of multiple inverters connected via RS485, configure the insulation resistance using the SWT2 switches, following the indications shown in the table below (O-OFF, 1-ON) and in the figure below. SWT2_1 SWT2_2 Status...
  • Page 44 Note: it is necessary to provide Zucchetti Centro Sistemi S.p.a. with the serial number in order to activate www.zcsazzurrowebportal.com. the inverter’s remote monitoring system. This can be sent to Figure 35 –...
  • Page 45 The 50K-70K TL inverters have a multi-function relay whose output can be configured. The communication terminal is found on the communication board, as shown in the figure. Connect the CNT10 input, as shown below. This can be connected as normally-open (e.g. connecting the NO contact and the COM contact), or it can be configured as normally-closed (e.g.
  • Page 46 3) Connect the stripped cable into the appropriate terminal of the terminal block. 46 / 80 Manual of 07/06/2019 Rev. 1.1“User Manual for 50K-70K TL” Identificazione: MD-AL-GI-00 Rev. 4.0 del 31.01.18 - Applicazione: GID...

  • Page 47: Commissioning The Inverter

    5. Commissioning the inverter 5.1. Safety inspection before commissioning Make sure that the DC and AC voltages are within the range permitted by the inverter. Attention  Photovoltaic strings Before turning on the inverter, examine the photovoltaic string. Check the open-circuit voltage of each photovoltaic panel and compare it with the data in the technical datasheet.

  • Page 48: Operating Interface

    If in doubt, consult the system engineer or a qualified electrician. Zucchetti Centro Sistemi S.p.A. shall not be held responsible for any consequences resulting from the incorrect selection of the country code. If the inverter indicates the presence of any faults, refer to chapter 7.1 of this manual or contact the Zucchetti Centro Sistemi S.p.A.

  • Page 49: Main Interface

    o Steady: temporary or permanent error o Off: normal operation  GFCI automatic differential circuit breaker indicating light (RED) o Steady: GFCI fault indication (ID12: automatic differential circuit breaker fault or ID20: device fault). o Off: GFCI in operation (automatic differential circuit breaker) normal 6.2.
  • Page 50 A10 - The MPPT SCAN function is on A11 – Steady light when the input voltage is higher than 160V A12 – Input channel and input voltage in real time A13 – Input voltage and current of string 1 and 2, shown alternatively every three seconds A14 –...

  • Page 51: Main Menu

    6.3. Main menu Press the “Menu/Back” button in the main interface screen to enter the main menu, which will appear as follows: Press the “OK” key to enter the “Settings” menu. The “Settings” menu contains the following sub-menu:  Date and time Select “1.
  • Page 52 date and time are expressed in the format: 20YY – MM - DD HH:MM:SS. The display will show “OK” if the setting is correct and “Error” in case of an error. The date and time can be seen in the submenu “4. Time” inside the main menu. ...
  • Page 53 Belgium Korea CEI 0-21 Areti UK-G59 Sweden 33-49 Reserved China General Europe France CEI 0-21 External Table 3 – Country codes for 50K TL and 60K TL inverters Code Country Code Country Code Country Germany VDE4105 Poland - MT Cyprus - MT - MT Germany BDEW - Italy CEI 0-21 - MT...
  • Page 54  Relay command Select “6. Relay Command” and press “OK” to enter the menu for setting the relay command. Use the “Up” and “Down” keys to select the respective configuration items, as shown below. Press “OK” to select. If the setting is successful, “OK”...
  • Page 55 the “Up” and “Down” keys to select the number and “OK” to move to the next one, and confirm. If the display shows “Wrong, try again!” press the “Back” key and enter the password again. When the password has been entered correctly, you can enter the menu.
  • Page 56 Safety Voltage The user can change the value of the protection voltage directly from the LCD display. The user must first copy the TXT files to the SD card. These files can be requested from Zucchetti Centro Sistemi Spa technical support.
  • Page 57 Insulation The user can change the value of the insulation resistance directly from the LCD display. The user must first copy the TXT files to the SD card. These files can be requested from Zucchetti Centro Sistemi Spa technical support.
  • Page 58 to select the number and “OK” to move to the next one, and confirm. If the display shows “Wrong, try again!” press the “Back” key and enter the password again. When the password has been entered correctly, you can enter the menu. Use the “Up” and “Down” keys to select the “1. Enable” and “2. Disable” option, and “OK” to confirm.
  • Page 59 choose between the items “Set Scan Param” and “Scan Test”. For each of the two items, you can use the “Up” and “Down” keys to select the “1. Enable” and “2. Disable” option, and “OK” to confirm. Entering the first menu, if the option “1.
  • Page 60 5) The self-test will now start automatically; once completed, press “Down” to display the self-test results, as shown in the figure. 60 / 80 Manual of 07/06/2019 Rev. 1.1“User Manual for 50K-70K TL” Identificazione: MD-AL-GI-00 Rev. 4.0 del 31.01.18 - Applicazione: GID...
  • Page 61  Standard Self-test 1) During normal operation of the inverter, press the “Back” key to enter the main menu. 2) Press the “OK” key to enter the “Settings” menu. 3) Press the “Down” key several times until “26. Standard Self-Test” is displayed on the screen. 4) Press “OK”...
  • Page 62 62 / 80 Manual of 07/06/2019 Rev. 1.1“User Manual for 50K-70K TL” Identificazione: MD-AL-GI-00 Rev. 4.0 del 31.01.18 - Applicazione: GID...
  • Page 63 Press the “OK” key to enter the “Event List” menu The “Event List” menu displays the events registered by the inverter, both historical and in real time, showing the progressive number of the event, its identification code, and date and time of its occurrence. The user can access this interface from the LCD display to check the details of the alarms and alerts.
  • Page 64  Inverter type Use the “Up” and “Down” keys in the “System Info” menu to move, and the “OK” key to enter the “1. Inverter type” menu. Here you can see the power of the inverter model  Serial number Use the “Up”...
  • Page 65  Q(v) Use the “Up” and “Down” keys in the “System Info” menu to move, and the “OK” key to enter the “12. Q(v)” menu. Here you can see the Q(v) value that has been set.  Service Code Use the “Up” and “Down” keys in the “System Info” menu to move, and the “OK” key to enter the “13. Service.Code”...
  • Page 66 Firmware update procedure 1. Switch off the ZCS inverter by first disconnecting the AC power supply via the switch installed on the system, and then disconnecting the DC power supply via the switch located on the side of the inverter (if equipped) or switch off the system’s disconnecting switch. Wait for the display to turn off completely.
  • Page 67 10. Check that the inverter completes the update correctly and that “INITIALIZING” appears on the display; the inverter will then start normally. If the update was not successful, one of the following messages will appear on the display: “COMMUNICATE FAIL”, “UPDATE DSP1 FAIL” or “UPDATE DSP2 FAIL”;...

  • Page 68: Troubleshooting And Maintenance

    7. Troubleshooting and maintenance 7.1. Troubleshooting This section contains information and procedures on how to troubleshoot any faults and errors that may occur during operation of the 50K-70K TL inverter. If you have any problems with the inverter, please follow these steps. ...
  • Page 69 Check whether too few photovoltaic modules have been connected in series in a PV string; therefore, the voltage (Vmp) of the PV string is lower than the minimum operating Input voltage is too PVUVP voltage of the inverter. In this case, ID05 low.
  • Page 70 whether the mains voltage and frequency are in an acceptable range. If not, contact technical support. Otherwise, check the conditions of the AC switch and the cable harness. Check whether the input current is Input current is too higher than the maximum input high and has current of the inverters, then check HwBoostOCP...
  • Page 71 again. Check that the fault is no longer present. If this is not the case, contact Bus voltage is not VbusUnbalance ID27 Technical Support. balanced. Check the configuration of the input mode (parallel mode / independent mode) of the inverter, as indicated in Section 6.3 (C).
  • Page 72 Sampling value of the automatic differential circuit breaker ConsistentFault_GFCI ID52 between the master DSP and the slave DSP is not consistent. SPI communication between the master SpiCommLose ID53 DSP and the slave DSP is faulty. SCI communication between the control SciCommLose board and ID54...
  • Page 73 Input current is not balanced and has UnrecoverIpvUnbalance ID68 caused an unrecoverable fault. Bus voltage is not balanced and has UnrecoverVbusUnbalance ID69 caused an unrecoverable fault. Grid current is too high and has caused UnrecoverOCPInstant ID70 an unrecoverable fault. Check the configuration of the input mode (parallel mode / independent mode) of the inverter, as indicated in UnrecoverPvConfigSetWrong...
  • Page 74 Inverter has been The inverter automatically reduces derated because the OverFreqDerating the output power when the frequency ID82 grid current is too of the electrical grid is too high. high. The inverter registers an ID83 error in case of remote derating operation. Inverter has been Check the wiring of the remote input RemoteDerating...
  • Page 75 Software between the The software version is control board and Contact Technical Support to update ID94 unsuitable communication board the software. is unsuitable. EEPROM of the Faulty EEPROM ID95-ID96 are internal faults of the communication board ID95 communication board. inverter; turn off the “DC switch”, wait is faulty.

  • Page 76: Maintenance

    7.2. Maintenance Inverters generally do not require daily or routine maintenance. In any case, for proper long-term operation of the inverter, make sure that the heatsink for cooling the inverter has enough space to ensure adequate ventilation and that it is not obstructed by dust or other items. Cleaning the inverter Use an air compressor, soft dry cloth or soft-bristled brush to clean the inverter.

  • Page 77: Uninstalling

    8. Uninstalling 8.1. Steps for uninstalling the inverter  Disconnect the inverter from the AC grid by opening the AC circuit breaker.  Disconnect the inverter from the photovoltaic strings by opening the DC circuit breaker.  Wait 5 minutes ...

  • Page 78: Technical Specifications

    9. Technical specifications Technical specifications 50000 TL 60000 TL 70000 TL Input (DC) Maximum DC Power 55000W 66000W 77000W 22000W (500V- 22000W (5030V- Maximum DC power for each MPPT 26000W (660V-800V) 800V) 800V) No. of independent MPPTs / No. of 3 / (4/3/3) 3 / (4/4/4) strings per MPPT...
  • Page 79 Maximum efficiency 98.5% 98.6% Weighted efficiency (EURO/CEC) 98.3% 98.4% Consumption at night <1W MPPT efficiency >99.9% Protection Reverse polarity protection DC DC circuit breaker Integrated Protection class / Overvoltage I/III category AC/DC MOV: Type III standard, optional AC/DC dischargers type II Integrated dischargers (only S5 models) Safety protection...

  • Page 80: Warranty

    10. Warranty Zucchetti Centro Sistemi SpA provides a 10-year product warranty from the date of installation of the 50K- 70K TL inverter, subject to registration on the website https://www.zcsazzurro.com/it/estensione- garanzia. In any case, the warranty cannot exceed 126 months from the date of delivery of the inverter.

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