Envertech EVT248 User manual

Microinverter EVT248
User manual

Microinverter EVT248
HIGHLIGHTS
High-quality energy harvest with high MPPT accuracy
Concentrated reliability and stability
No single-point failure
Improved safety with integrated complete set of protec on func ons
Life me free remote monitoring at solar pane l ’ s level
Flexibly adapted to almost all 60-cell or 72-cell panels
Easy installa on
Long life  me
The EVT248 Microinverter as a cu ng-edge spokesman for the microinverters in the new era, has
full sincerity and devo on to stability, details and more advanced tech. EVT248 seeks to enable best
improved solar energy harvest, highest possible reliability, much simplifi ed installa on and most effi cient
management of solar power systems.
Each EVT248 is individually connected to one solar panel with every MPPT(Maximum Power Point
Tracking) respec vely for every panel. This unique confi gura on minimizes the nega ve impact from
environment such as shading, dust, orienta on or panel aging and eliminates the possibility of
single-point failure, thus improving the system’s harvest to largest extent.

1. Important Safety Informa on
1.1 READ IT FIRST
This manual contains important instruc ons for installa on and maintenance of the EVT248
microinverter.
To reduce the risk of electrical shock, and to ensure safe installa on and opera on of the microinverter,
the following safety symbols appear throughout this document to indicate dangerous condi ons and
important safety instruc ons.
DANGER
DANGER indicates a hazardous situa on which, if not avoided,
will result in death or serious injury.
WARNING
WARNING indicates a hazardous situa on which, if not avoided,
can result in death or serious injury or moderate injury.
NOTICE
NOTICE indicates a situa on that can result in property damage,
if not avoided.

1.2 SAFETY INSTRUCTIONS
• Do not use Envertech equipment in a manner not specifi ed by the manufacturer. Doing so may cause
death or injury to persons, or damage to equipment.
• Be aware that only qualifi ed personnel should install or replace the Envertech microinverters and the
Cable and accessories.
• Do not a empt to repair the Envertech microinverter; it contains no user-serviceable parts. If it fails,
contact Envertech customer service to start the replacement process. Tampering with or opening the
Envertech microinverter will void the warranty.
• If the AC cable on the microinverter is damaged or broken, do not install the unit.
• Before installing or using the Envertech microinverter, read all instruc ons and cau onary markings in
the technical descrip on and on the Envertech microinverter system and the PV equipment.
• Connect the Envertech Microinverter to the u lity grid only a er you have completed all installa on
procedures and a er receiving prior approval from the electrical u lity company.
• Be aware that the body of the Envertech microinverter itself is aheat sink. Under normal opera ng
condi ons, the temperature is 20°C above ambient, but under extreme condi ons the microinverter
can reach a temperature of 65°C (176°F). To reduce risk of burns, use cau on when working with
microinverters.
• Do not disconnect the PV module from the Envertech microinverter without fi rst removing AC power.
• Be aware that the EVT248 has the ability to auto adjust voltage and frequency according to the se ngs
based on local standards. Only an authorized installer who has got permission from local electrical
u lity and meets with the following requirements shall be allowed to set the Envertech microinverter.
2. Envertech Microinverter System
The Envertech microinverter system is an on-grid microinverter system with world top-class technology.
This manual gave details about safe installa on and opera on of the Envertech Microinverter.
The three key elements of an Envertech microinverter system include:
EVT248 microinverter EnverBridge: monitoring
and communica on device.

EnverPortal: data display
and analysis web pla orm.
This integrated system maximizes energy harvest, increases system reliability, and simplifi es design,
installa on and management.
2.1 HOW IT WORKS
The Envertech microinverter maximizes energy produc on from your photovoltaic (PV) array. Each
Envertech microinverter is individually connected to one PV module in your array. This unique
confi gura on means that an individual Maximum Peak Power Point Tracker (MPPT) controls each PV
module. This ensures that the maximum power available from each PV module is exported to the u lity
grid regardless of the performance of the other PV modules in the array. That is, although individual
PV modules in the array may be aff ected by shading, soiling, orienta on, or PV module mismatch, the
Envertech microinverter ensures top performance for its associated PV module. The result is maximum
energy produc on from your PV system.
2.2 MONITORING DEVICE: ENVERBRIDGE
Once you install EnverBridge and provide an ethernet connec on to your broadband router or modem,
the Envertech microinverter automa cally begin repor ng to the Envertech EnverBridge web server.
The EnverBridge so ware presents current and historical system.
Performance trends, and it informs you of PV system status.

2.3 OPTIMAL RELIABILITY
Microinverter systems are inherently more reliable than tradi onalinverters. The distributed nature
of a Microinverter system ensures that there is no single point failure in the PV system. Envertech
Microinverters are designed to operate at full power at ambient temperatures as high as +65°C (150°F).
The Microinverter casing is designed for outdoor installa on and complies with the IP65 protec on level.
IP65 ra ng defi ni on: IP stands for ‚Ingress Protec on‘. An IP number is used to specify the
environmental protec on of enclosures around electronic equipment. It is composed of two numbers,
the fi rst referring to the protec on against solid objects and the second against liquids. The higher the
number, the be er the protec on. 6 means totally protected against dust.5 means protected against low
pressure water jets from any direc on.
NOTE: To ensure op mal reliability and to meet warranty requirements, the Envertech microinverter
must be installed according to the instruc ons in this manual.
2.4 SIMPLE DESIGN
PV systems using Envertech microinverters are very simple to design and install. You can install
a combina on of PV modules of any type, at any orienta on and in any quan ty. You won’t need to
install cumbersome tradi onal inverters. Each microinverter can be quickly mounted on the PV racking,
directly beneath each PV module. Low voltage DC wires connect from the PV module directly to the
co-located microinverter, elimina ng the risk of personnel exposure to dangerously high DC voltage.

Model EVT248
Input Data (DC)
Recommended maximum input 300 W
Maximum input DC voltage 54 V
Start voltage 24 V
Peak power tracking range 28V ~ 42 V
Opera ng range 18V ~ 54 V
Maximum DC short circuit
current 15 A
Maximum input current 9.5 A
Output Data (AC)
Rated output power 248 W
Maximum output current 1.07 A
Nominal voltage 220 V / 230 V / 240 V
Nominal frequency 50 Hz / 60 Hz
Power factor > 0.99
Total Harmonic Distor on < 3%
Maximum units per branch 15
Effi ciency
Peak inverter effi ciency 95.6%
EURO weighted effi ciency 95% (according
to the EN50530)
Nigh me power consump on 100 mW
Mechanical Data
Enclosure environmental ra ng IP65
Ambient temperature range -40°C ~ +85°C
Opera ng temperature range -40°C ~ +65°C
Dimensions (WxHxD) 163 mm x 163 mm
x 27 mm
Weight 1.5 kg
Features
Communica on PLCC
Warranty 25 Years
3. Product Informa on
3.1 OVERVIEW 3.3 DATASHEET
3.2 MAJOR CHARACTERISTICS
Envertech microinverter has the following
characteris cs which make Envertech
microinverter “High Effi cient, High Reliable,
High Cost Eff ecient”.
Wide DC input voltage range and current range.
Wide MPPT voltage range ensures high yield
under various weather condi ons.
High MPPT accuracy, ensures the minimum
power loss during conver ng.
Complete set of protec on func ons.
Also,the following protec on func ons are
integrated in Envertech microinverter:
• Internal overvoltage/undervoltage
• Faulty Grounding protec on
• Grid monitoring
• Ground overcurrent monitoring
• DC current monitoring

4. Packing checklist
4.1 ACCESSORIES
A er you receive the Envertech microinverter, please check if there is any damage on the carton,
and then check the inside completeness for any visible external damage on the microinverter and
accessories. Contact your dealer if anything is damaged or missing.
4.2 PRODUCT DESCRIPTION
4.3 FURTHER INFORMATION
If you have any further ques ons concerning accessories or installa on, please check our website
www.envertec.com or send an email to [e-mail]
4.3 FURTHER INFORMATION
AC connector
Wall bracket hole
Grounding hole
LED light
DC connectors

5. Planning of Microinverter Installa on
5.1 EXPLANATIONS OF SYMBOLS ON INVERTER
Symbol Descrip on
Dangerous electrical voltage
This device is directly connected to public grid, thus all work related to
theinverter shall only be carried out by qualifi ed personnel.
NOTICE, danger!
This device directly connected with electricity generators and public grid.
Danger of hot surface
The components inside the inverter will release a log of heat during
opera on. DO NOT touch aluminum casing during opera ng.
An error has occurred
Please go to Chapter 10 “Trouble Shoo ng” to repair the error.
This device SHALL NOT be disposed of in residen al wastePlease go to
Chapter 9 “Recycling and Disposal” for proper treatments.
No unauthorized perfora ons or modifi ca ons
Any unauthorized perfora ons or modifi ca ons are strictly forbidden.
If any defect or damage (device/person) is occurred, Envertech shall
not take any responsibility for it.
5.2 LIGHTNING AND SURGE SUPPRESSION
Envertech microinverters have integral surge protec on. However, if the surge has excess energy, the
protec on built into the microinverter can be exceeded, and the equipment can be damaged. For this
reason, Envertech recommends that you protect your system with lightning and/or surge suppression
devices. In addi on to having some level of surge suppression, it is important to have insurance that
protects against lightning and electrical surges.

6. Microinverter Installa on
6.1 TOOL REQUIRED
6.2 NECESSARY PARTS FOR INSTALLATION
01 PV module
02 Microinverter
03 Moun ng racking
04 AC BUS Cable
05 AC Extension Cable
06 AC Trunk Plug Tag
07 AC Trunk End Cap
08 AC Trunk Unlock Tool
05
04
03
06
07
01
02
09
08
12
11 08
13
10
DANGER
DO NOT connect or disconnect the PV module and Envertech Microinverter
without fi rst removing AC power from the PV system.

6.3 INSTALLATION STEPS
Installing the microinverter system involves several key steps. Each step listed here is detailed in the
following page.
Step 1: Posi on AC BUS cable.
Step 2: Fix the microinverter to the rack appropriate to the loca ons of BUS cable connectors. A er that,
fasten AC BUS cable to the rack with cable  es.
Step 3: Connect AC cables.
Step 4: Terminate the unused end of AC BUS cable with the AC Trunk end cap.
Step 5: Mount EnverBridge, connect AC BUS cable to Enverbridge with AC extension cable and connect
EnverBridge to the distribu on grid.
Step 6: Mount PV panels on the racking system and connect DC leads to the microinverters.
Step 7: Place the labels on the EVT248 installa on diagram to iden fy the loca on of each microinverter.
Step 8: Energize the system by turning on the breaker in the distribu on panel. Then you are welcome
to visit our energy and monitoring website EnverPortal to enjoy the performance of your solar
system.
WARNING
Allow a minimum of 1.9cm between the roof and the bo om of the
microinverter. Also allow 1.3cm between the back of the PV module
and the top of the microinvereter.
WARNING
You must install the microinverter under the module out of rain and
sun. Do not mount the microinverter in a posi on that allows long-term
exposure to direct sunlight or in a ver cal orienta on that allows water to
collect in the DC connec on part.
WARNING
The microinverter is not equipped to operate in environments that
have par cular fl ammability or explosive condi ons.

6.4 CABLE ASSEMBLY
Note:
Wire size/ Inner jacket OD Max: 10AWG, 12AWG, 14AWG / Max OD 4.65 mm
Recommended sealing nut torque: 25Kgf.cm (2.5N.m)
Recommended installa on temperature: 20°C (60°F) upward
Avoid oil and gasoline
Waterproof rate: IP65
18 mm ~ 25 mm
1) Strip cable jacket 18 mm ~ 25 mm. 2) Disassemble the seal, the clamp ring and
the Nut, then insert through the cable.
3) Insert every wire into the holes.
5) Screw the sealing nut into body  ghtly
with a force of 25 Kgf.cm.
4) Push he cable to the end. Gently try
to pull out the cable. It should not be
pulled out.

7. Debugging and Opera ng
Please no ce the symbols.
7.1 ENERGIZE THE SYSTEM
1. Turn ON circuit breaker for each microinverter AC branch circuit if there is.
2. Turn ON the main u lity-grid AC circuit breaker. Your system starts producing power a er fi ve minutes.
3. The Envertech microinverter begins communica ng over the power lines to Enver- Bridge. The  me
required for all microinverters to report to EnverBridge is depent on the number of microinverters
in the system. The fi rst units should be detected within 15 minutes but the en re system could take
hours to be detected.
4. The EVT248 has the ability to auto adjust voltage and frequency according to the se ngs based on
local standards. If adjustments are required by your local u lity, the installer can use EnverBridge to
manage the grid profi le a er all microinverters have been detected.
7.2 EVT248 OPERATION
The Envertech microinverter is powered on when suffi cient DC voltage from the PV module is applied.
The LED status of each microinverter will blink green to indicate normal start-up opera on approximately
one minute a er DC power is applied. You may need to use a handheld mirror to view indicator lights on
the undersides of the microinverters.
WARNING
Only qualifi ed personnel may connect the Envertech microinverter to
the u lity grid a er receiving prior approval from the electricalu lity
company.
WARNING
Ensure that all AC and DC wiring is correct. Ensure that none of the AC
and DC wires is pinched or damaged. Ensure that all AC junc on boxes
are properly closed.

8. Troubleshoo ng and Maintenance
Adhere to all the safety measures described throughout this manual. Qualifi ed personnel can use the
following troubleshoo ng steps if the PV system does not operate correctly.
8.1 LED STATUS INDICATIONS AND ERROR REPORTING
Startup LED Opera on:
The LED status of each microinverter blinks green to indicate normal start-up opera on approximately
one minute a er DC power is applied. Red blinks a er DC power fi rst applied to the microinverter
indicate a failure during the startup.
Post-Startup LED Indica ons:
Use a handheld mirror to view indicator lights on the undersides of the microinverters:
Flashing Green: indicates normal opera on.
Flashing Red: indicates that the microinverter is not opera ng normally. The microinverter
does not sense that the u lity grid is within voltage/frequency specifi ca ons.
The microinverter cannot produce power un l this is solved.
8.2 TROUBLESHOOT AN INOPERABLE MICROINVERTER
To troubleshoot an inoperable microinverter, follow the steps in the order shown below.
WARNING: Be aware that only qualifi ed personnel should troubleshoot the PV array or the Envertech
microinverter.
Best Prac ce: Never disconnect the DC wire connectors under load. Ensure that no current is fl owing in
the DC wires prior to disconnec ng. If necessary, use an opaque covering to cover the PV module prior
to disconnec ng the PV module. Always disconnect AC power before disconnec ng the PV module wires
from the Envertech microinverter. The AC connector of the microinverter is suitable as a disconnec ng
means.
WARNING: The AC and DC connectors on the cabling are rated as a disconnect only when used with an
Envertech microinverter.
WARNING
Do not a empt to repair the Envertech microinverter.It contains no
user-serviceable parts. If the Microinverter fails, contact Envertech
customer service to obtain an RMA (return merchandise authoriza on)
number and start the replacement process.

WARNING: The Envertech microinverters are powered by DC power from the PV modules. Make sure
you disconnect the DC connec ons and reconnect DC power to watch for the LED blinks one minute
a er DC is applied.
1. Make sure AC breakers is turned on.
2. Check the connec on to the u lity grid and verify that the u lity voltage is within allowable ranges
shown in the Technical Data sec on.
3. Verify that AC line voltage at all solar power circuit breakers at the load center and subpanels is
within the ranges shown in the following table.
4. Verify that AC line voltage at the junc on box for each AC branch circuit are within the ranges are
shown in the following table:
5. Using an Envertech disconnec ng tool, disconnect the AC cable for the faulty microinverter from the
cable.
6. Verify that u lity power is present in the microinverter by measuring line to line and line to neutral at
the Cable connector.
7. Visually check that the AC branch circuit connec ons (Cable and AC connec ons) are properly
seated. Reseat if necessary. Check also for damage, such as rodent damage.
8. Make sure that any upstream AC disconnec on, as well as the dedicated circuit breakers for each AC
branch circuit, are func oning properly.
9. Disconnect and re-connect the DC PV module connectors. The LED status of each microinverter will
blink green to indicate normal start-up opera on soon (less than one minute) a er DC power is
applied. The LED subsequently resumes normal opera on if the grid is present.
10. A ach an ammeter clamp to one conductor of the DC cables from the PV module to measure
microinverter current. This will be under one Amp if AC is disconnected.
11. Check the DC connec ons between the microinverter and the PV module. The connec on may need
to be  ghtened or reseated. If the connec on is worn out or damaged, it may need replacement.
12. Verify with your u lity that line frequency is within range.
220/230/240 Volt AC, Single Phase
L to N 184 to 264 VAC

GWL Power Ltd.
Průmyslová 11,102 19 Prague 10
Czech Republic, European Union
Microinverter EVT248
8.3 MICROINVERTER MAINTENANCE
Rou ne Maintenance, although not mandatory, is recommended to maintain
effi cient opera on of the PV installa on.
ROUTINE MAINTENANCE
WARNING
It is recommended that maintenance opera ons shall be only
performed by qualifi ed personnel or Envertech personnel.
The maintenance schedule may vary depending on the environmental
condi ons of the installa on site.
Rou ne Maintenance
Annual Cleaning
Conduct an annual visual inspec on(where possible) on the various components(DC cables,
microinverters and AC cables) to check for dust, dirt, moisture and water seepage.
Clean the equipment if necessary. Clean using compressed air, a vacuum cleaner or special brushes,
if possible.
Annual Opera ons Check that there has been no dras c change in the installa on condi ons that might have nega ve
infl uence on the communica on between microinverters and the monitoring device.