APsystems YC500A Instruction Manual

Installation / User Manual
Rev 1.0
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ALTENERGY POWER SYSTEM Inc.
WEB: www.APsystems.com
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YC500A/IMicroinverter

1
Table of Contents
Important Safety Instructions............................................................................................................. 2
Safety Instructions................................................................................................................................................ 2
Radio interference statement...............................................................................................................................3
Communication Statement...................................................................................................................................3
APsystems YC500 System Introduction............................................................................................... 4
APsystems Microinverter YC500 Series Introduction......................................................................... 6
APsystems Microinverter System Installation.................................................................................... 7
Additional Installation components from APsystems..........................................................................................7
Required Parts and Tools from you...................................................................................................................... 7
YC500A Installation Procedures............................................................................................................................8
Step 1 - Installing the AC Branch Circuit junction box..................................................................................8
Step 2 - Attaching the APsystems Microinverters to the Racking or the PV Module Frame...................... 9
Step 3 - Connecting the APsystems Microinverter AC Cables....................................................................10
Step 4 - Connecting APsystems Microinverters to the PV Module............................................................ 11
Step 5 - Completing the APsystems Installation Map.................................................................................11
YC500I Installation Procedures........................................................................................................................... 13
Step 1 - Position the AC bus cable.............................................................................................................. 13
Step 2 - Install the AC branch circuit junction box..................................................................................... 13
Step 3 - Attach the APsystems Microinverters to the racking or the PV module frame............................13
Stpe 4 - Connect the APsystems microinverter to AC bus cable................................................................14
Step 5 - Install a Bus Cable End Cap at the end of AC bus cable................................................................15
Step 6 - Connect APsystems Microinverters to the PV Modules............................................................... 15
Step 7 - Complete the APsystems Installation Map................................................................................... 16
Step 8 - Place a Warning Notice................................................................................................................. 17
Troubleshooting................................................................................................................................. 19
Status Indications and Error Reporting...............................................................................................................19
Start up LED.................................................................................................................................................19
Operation LED............................................................................................................................................. 19
GFDI Error....................................................................................................................................................19
Other Faults.................................................................................................................................................19
Troubleshooting a non-operating APsystems Microinverter............................................................................. 20
Replace a microinverter.....................................................................................................................21
Technical Data.................................................................................................................................... 22
YC500A/I Microinverter Datasheet.....................................................................................................................23
Wiring Diagram.................................................................................................................................. 24
YC500A Sample Wiring Diagram - Split Phase.................................................................................................... 24
YC500A Sample Wiring Diagram - Three Phase..................................................................................................25
YC500I Sample Wiring Diagram - Split Phase..................................................................................................... 26
YC500I Sample Wiring Diagram - Three Phase................................................................................................... 27

YC500A/I Installation/User Manual
2
Important Safety Instructions
This manual contains important instructions to follow during installation and maintenance of
the APsystems Photovoltaic Grid-connected Inverter (Microinverter). To reduce the risk of
electrical shock and ensure the safe installation and operation of the APsystems Microinverter,
the following symbols appear throughout this document to indicate dangerous conditions and
important safety instructions.
SAVE THESE INSTRUCTIONS! This manual contains important instructions for models
YC500A/YC500I that must be followed during Installation and maintenance of the
Photovoltaic Grid-connected Inverter.
Specifications subject to change without notice - please ensure you are using the most recent
update found at www.APsystems.com
WARNING: This indicates a situation where failure to follow instructions may
cause a serious hardware failure or personnel danger if not applied appropriately.
Use extreme caution when performing this task.
NOTE: This indicates information that is important for optimized
Microinverter operation. Follow these instructions closely.
Safety Instructions
Do NOT disconnect the PV module from the APsystems Microinverter without first
disconnecting the AC power.
Only qualified professionals should install and/or replace APsystems Microinverters.
Perform all electrical installations in accordance with local electrical codes.
Before installing or using the APsystems Microinverter, please read all instructions and
cautionary markings in the technical documents and on the APsystems Microinverter
system and the solar-array.
Be aware that the body of the APsystems Microinverter is the heat sink and can reach a
temperature of 80°C. To reduce risk of burns, do not touch the body of the Microinverter.
Do NOT attempt to repair the APsystems Microinverter. If it fails, contactAPsystems
Customer Support (206-855-5100) to obtain an RMA number and start the replacement
process. Damaging or opening the APsystems Microinverter will void the warranty.
WARNING
SYMBOL
NOTE
SYMBOL

YC500A/I Installation/User Manual
3
Important Safety Instructions
Radio interference statement
FCC Compliance ：The equipment can comply with the limits for a class B
digitaldevice,pursuant to part 15 of the FCC Rules, which are designed to protect against
harmful interference in a residential installation. The equipment could radiate radio frequency
energy and this might cause harmful interference to radio communications if not following the
instructions when installing and using the equipment. But there is no guarantee that
interference will not occur in a particular installation. If this equipment causes harmful
interference to radio or television reception, the following measures might resolve the issues:
A) Relocate the receiving antenna and keep it well away from the equipment.
B) Consult the dealer or an experienced radio / TV technical for help.
Changes or modifications not expressly approved by the party responsible for compliance may
void the user’s authority to operate the equipment.
Communication Statement
The APsystems Energy Monitoring and Analysis (EMA) software analyzes and reports the
performance of each module from real-time data collected through the Energy Communication
Unit (ECU) gateway. The EMA promptly detects any performance issues in the array,
pinpointing the location and nature of the problem and providing precise guidance for
maintenance, all within a user-friendly graphic interface.Communication between inverters
and the ECU may be affected by signal “noise” from nearby electrical equipment, the distance
between inverters and the ECU, the number of inverters supported, and other factors, so
sometimes the ECU experiences loss of signal or data randomly, that is not a problem or a fault.
If the ECU does not communicate with the EMA database at all, contact APsystems support.

YC500A/I Installation/User Manual
4
APsystems YC500 System Introduction
The APsystems Microinverter is used in utility-interactive grid-tied applications, comprised of
three key elements:
APsystems Microinverter
APsystems Energy Communication Unit (ECU)
APsystems Energy Monitor and Analysis (EMA) web-based
monitoring and analysis system
Figure 1

YC500A/I Installation/User Manual
5
APsystems YC500 System Introduction
This integrated system improves safety; maximizes solar energy harvest; increases system
reliability, and simplifies solar system design, installation, maintenance, and management.
APsystems Microinverters maximize PV energy production
Each PV module has individual Maximum Peak Power Tracking (MPPT) controls, which
ensures that the maximum power is exported to the utility grid regardless of the performance
of the other PV modules in the array. When PV modules in the array are affected by shade,
dust, orientation, or any situation in which one module underperforms compared with the
other units, the APsystems Microinverter ensures top performance from the array by
maximizing the performance of each module within the array.
More reliable than centralized or string inverters
The distributed APsystems Microinverter system ensures that no single point of system failure
exists across the PV system. APsystems Microinverters are designed to operate at full power at
ambient outdoor temperatures of up to 149°F (65°C). The inverter housing is designed for
outdoor installation and complies with the NEMA 6 environmental enclosure rating.
Simple to install
You can install individual PV modules in any combination of module quantity,
orientation,different type and power rate.(check our online module compatibility checker called
Edecider or contact APsystems).
The Ground wire (PE) of the AC cable is connected to the chassis inside of the
Microinverter, eliminating the installation of grounding wire (check local
regulation).
Smart system performance monitoring and analysis
The APsystems Energy Communication Unit (ECU) is installed by simply plugging it into any
wall outlet and providing an Ethernet or Wi-Fi connection to a broadband router or
modem.After installing and setting the ECU (see ECU manual), the full network of APsystems
Microinverters automatically reports to the APsystems Energy Monitor and analysis (EMA)
web server.The EMA software displays performance trends, informs you of abnormal events,
and controls system shutdown when it is needed. (See ECU manual for instructions.)

YC500A/I Installation/User Manual
6
APsystems Microinverter YC500 Series Introduction
The APsystems YC500 Microinverters connect with the Split-phase grid, and operate with
most 60 and 72 cell PV modules. For more information, please see the Technical Data page
(p.22) of this manual.
Model
Number
AC grid
PV Module
Max. #
Per branch
Module Connector
YC500A
50Hz/230V
60,72 Cell
11 for 25A breaker
MC-4 Type or Customize
YC500I
50Hz/230V
60,72 Cell
9 for 20A breaker
MC-4 Type or Customize

YC500A/I Installation/User Manual
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APsystems Microinverter System Installation
A PV system using APsystems Microinverters is simple to install. Each Microinverter easily
mounts on the PV racking, directly beneath the PV module(s). Low voltage DC wires connect
from the PV module directly to the Microinverter, eliminating the risk of high DC voltage.
Installation MUST comply with local regulations and technical rules.
Special Statement! An AC GFCI device should not be used to protect the dedicated circuit to
the APsystems microinverter even though it is an outside circuit. None of the small GFCI devices
(5mA-30 mA) are designed for back feeding and will be damaged if back feed. In a similar
manner, AC AFCIs have not been evaluated for back feeding and may be damaged if back feed
with the output of a PV inverter.
WARNING: Perform all electrical installations in accordance
with local electrical codes.
WARNING:Be aware that only qualified professionals should
install and/or replace APsystems Microinverters.
WARNING: Before installing or using an APsystems
Microinverter, please read all instructions and warnings in the
technical documents and on the APsystems Microinverter system
itself as well as on the PV array.
WARNING: Be aware that installation of this equipment
includes the risk of electric shock.
WARNING: Do not touch any live parts in the system, including
the PV array, when the system has been connected to the electrical
grid.
NOTE: Strongly recommend to install surge protection devices
in the dedicated meter box.
Additional Installation components from APsystems
AC Extension Cable (sold separately)
AC Connector Cap (sold separately)
Bus Cable End Cap (sold separately)
Bus Cable T-CONN Cap (sold separately)
Required Parts and Tools from you
In addition to your PV array and its associated hardware, you will need the following items:
An AC connection junction box
Mounting hardware suitable for module racking
Sockets and wrenches for mounting hardware
A Phillips screwdriver
A torque wrench

YC500A/I Installation/User Manual
8
YC500A Installation Procedures
APsystems Microinverters are designed to only operate when they can sense power coming
from the grid. Even if they are plugged into the solar array, they will not turn themselves on
until they can read power from the grid.
WARNING: Do NOT connect APsystems Microinverters to the utility grid or
energize the AC circuit until you have completed all of the installation
procedures as described in the following sections.
Figure 2
Step 1 - Installing the AC Branch Circuit junction box
Figure 3
a. Install an appropriate junction box at a suitable location on the PV racking system
(typically at the end of a branch of modules).
b. Connect the open wire end of the AC branch end cable into the junction box using an
appropriate gland or strain relief fitting.
c. Wire the conductors: L - BROWN; N - BLUE; PE -YELLOW GREEN.
d. Connect the AC branch circuit junction box to the point of utility interconnection.
Go to AC junction box

YC500A/I Installation/User Manual
9
YC500A Installation Procedures
Step 2 - Attaching the APsystems Microinverters to the Racking or the
PV Module Frame
Attach to the racking
a. Mark the location of the Microinverter on the rack, with respect to the PV module
junction box or any other obstructions.
b. Mount one Microinverter at each of these locations using hardware recommended by
your module racking vendor.
Option 1:
Photovoltaic Grid-connected Inverter Type:YC500A-NA-MX
AB
Figure 4
Option:2
Figure 5
Attach to the PV module frame.
Drill holes on the PV module frame before installing YC500A. Please check with the module
manufacturer the compatibilty of such installation process.
Figure 6
WARNING: Prior to installing any of the microinverters, verify that the utility
voltage at the point of common connection matches the voltage rating on
microinverter label.
WARNING: Do not place the inverters (including DC and AC connectors) Where
exposed to the sun, rain or snow, even gap between modules. Allow a minimum
of 3/4’’(1.5cm.) between the roof and the bottom of the Microinverter to allow
proper air flow.
M8
(not supplied
by APsystems)
54
54
46
M4

YC500A/I Installation/User Manual
10
YC500A Installation Procedures
Step 3 - Connecting the APsystems Microinverter AC Cables
AB
Figure 7
Best Practice: Use screwdriver to split the Main connectors.
Figure 8
a. Check the Microinverter technical data page (P.22) for the maximum allowable number
of Microinverters on each AC branch circuit.
b. Plug the AC female connector of the first Microinverter into the male connector of the
next Microinverter, and so on, to form a continuous AC branch circuit.
c. Install a protective end cap on the open AC connector of the last Microinverter in the
AC branch circuit.
Figure 9
AC connector interface as follows.
Female Connector Male Connector Figure 10
WARNING: Do NOT exceed maximum number of Microinverters in an AC
branch circuit, as displayed on the Technical Data page (p.22) of this manual.
NOTE: Please contact with ALTENERGY POWER SYSTEM Inc for the
purchase of AC extended cables when microinverters which are installed
space far and AC cable is not long enough.
Female
Connector
Male
Connector
L
N
PE
N
L
PE

YC500A/I Installation/User Manual
11
YC500A Installation Procedures
Step 4 - Connecting APsystems Microinverters to the PV Module
Connect the DC cables from the PV Modules to the Microinverter per the diagram below:
NOTE: When plugging in the DC cables, the Microinverter should immediately
blink green three times. This will happen as soon as the cables are plugged in
and will show that the Microinverter is functioning correctly. This entire check
function will start and end within 5 seconds of plugging in the unit, so pay careful
attention to these lights when connecting the DC cables.
AB
Figre 11
WARNING: Insure that all AC and DC wiring is correct. Check that none of the
AC and DC wires are pinched or damaged. Be sure that all junction box are
properly closed.
NOTE: About A and B Sides corresponding the location of modules, EMA
registration show acquiesce in this installation. if there are different connection
methods, please email the detail installation drawings to us to register, or the
A, B Sides corresponding component location will not correspond to the EMA
position.
Step 5 - Completing the APsystems Installation Map
Fill in the APsystems Registration Cards, which provide system information and the
installation map. Feel free to provide your own layout if a larger or more intricate installation
map is required. The layout map provided is designed to accomodate labels in vertical or
horizontal orientation to meet all the field PV connections.
a. Each APsystems Microinverter has removable serial number labels.Peel labels off, affix
one to the respective location on the APsystems installation map, and fill in A,B in the
label below(as figure13) according to the layout on the roof(as figure 12). Then affix
another label to the PV module frame which is easy to see. The warranty cards can
obtain from the appendix of this manual or APsystems website www.APsystems.com
b. Fill the warranty cards and email to APsystems at [e-mail]
c. APsystems will create the EMA account and email you the account information. Then
you can use the EMA website to view detailed performance of your PV system. You can
learn more information on energy monitoring and analysis system from APsystems
websitewww.APsystems.com

YC500A/I Installation/User Manual
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YC500A Installation Procedures
A
B
Figure 12
Microinverter
serial numbers
A
BA BA B
101123458044 101123458045 101123458054
……
Figure 13
1 2 34 5 6 7 89 10 11 12 13 14 15 1716 18 19 20 2221
APsystems Microinverter&Energy Communication Unit
Warranty Card
The APsystems Installation Map is a diagram of the physical location of each microinverter in your PV installation.
Each APsystems microinverter has a removable serial number label located on the mounting plate. Pee l the label
and affix it to the respective location on the APsystems installation map.
Installation Map Template
To register your APsystems microinverter, please mail this warranty registration card to: emasupport@altenergy-power com.
B A B A B A
Figure 15
NOTE: 1. The layout of the inverters' serial numbers on the warranty card
is only suitable for general arrangement.
2. Step 1~6 can change sequence for convenience of installation.
3. Warranty card is located in Appendix last page of this manual.
4. You can use Scanning Gun or mobile phone to scan the
serial numbers on the map when set ECU (see ECU manual).
5. Using apsystems' mobile app ArrayApp can make the
installation and registion much more simple.

YC500A/I Installation/User Manual
13
YC500I Installation Procedures
Step 1 - Position the AC bus cable
Step 2 - Install the AC branch circuit junction box
Figure 16
a. Install an appropriate junction box at a suitable location on the PV racking system
((typically at the end of a branch of modules).
b. Connect the open wire end of the AC bus cable into the junction box using an appropriate
gland or strain relief fitting.
c. Wire the conductors of the AC bus: L - BROWN; N - BLUE; PE - YELLOW GREEN.
d. Connect the AC branch circuit junction box to the point of utility interconnection.
WARNING: Wiring colour code can be different according local regulation,
check all the wires of the installation before connecting to the AC bus to be
sure they match.Wrong cabling can damage irreparably the microinverters,
such an issue is not covered by the warranty.
Step 3 - Attach the APsystems Microinverters to the racking or
the PV module frame
Attach to the racking
a. Mark the location of the Microinverter on the rack, with respect to the PV module
junction box or any other obstructions.
b. Mount one Microinverter at each of these locations using hardware recommended by
your module racking vendor.
Option 1:
A
B
Figure 17
Option 2:
Figure 18
M8
M8
(not supplied by APsystems)

YC500A/I Installation/User Manual
14
YC500I Installation Procedures
Attach to the PV module frame.
Drill holes on the PV module frame before installing YC500I. Please check with
the module manufacturer the compatibilty of such installation process.
Figure 19
WARNING: Prior to installing any of the microinverters, verify
that the utility voltage at the point of common connection matches
the voltage rating on microinverter label.
WARNING: Do not place the inverters (including DC and AC connectors)
Where exposed to the sun, rain or snow, even gap between modules.
Allow a minimum of 3/4’’(1.5cm.) between the roof and the bottom of the
Microinverter to allow proper air flow.
Stpe 4 - Connect the APsystems microinverter to AC bus cable
Figure 20
Best Practice: Use the Bus Cable Unlock Tool of AC Bus to split the connectors.
a. Check the Microinverter technical data page(p.22) for the maximum
allowable number of Microinverters on each AC branch circuit.
b. Plug the AC connector of the Microinverter into the AC bus
AC connector interface as follows.
Figure 21
54
54
46
M4
Click
L
PE
N

YC500A/I Installation/User Manual
15
YC500I Installation Procedures
Cover any unused connectors with Bus Cable T-CONN Cap to protect the connectors.
Figure 22
WARNING: Do NOT exceed maximum number of Microinverters
in an AC branch circuit, as displayed on the Technical Data page
(p.22) of this manual.
Step 5 - Install a Bus Cable End Cap at the end of AC bus cable
a. Strip cable jacket. c. Insert the wires into the cable clamps.
b. Insert the cable end into the seal. d. Rotate the nut with 3.3N·m until the
latching mechanism meets the base.
Figure 23
Step 6 - Connect APsystems Microinverters to the PV Modules
Figure 24
WARNING: Double check to make sure all of the AC and DC wiring
has been correctly installed. Ensure that none of the AC and/or DC
wires are pinched or damaged. Make sure that all of the junction
boxes are properly closed.
NOTE: When plugging in the DC cables, the Microinverter should
immediately blink one quick red and three short green. This will happen
as soon as the cables are plugged in and will show that the Microinverter is
functioning correctly. This entire check function will start and end
within 5 seconds of plugging in the unit, so pay careful attention to
these lights when connecting the DC cables.
NOTE: About A and B Sides corresponding the location of modules,
EMA registration show acquiesce in this installation. if there are
different connection methods, please email the detail installation
drawings to us to register, or the A, B Sides corresponding component
location will not correspond to the EMA position.
Nut
Seal
Body

YC500A/I Installation/User Manual
16
YC500I Installation Procedures
Step 7 - Complete the APsystems Installation Map
Fill in the APsystems Registration Cards, which provide system information
and the installation map. Feel free to provide your own layout if a larger or
more intricate installation map is required. The layout map provided is
designed to accomodate labels in vertical or horizontal orientation to meet
all the field PV connections.
d. Each APsystems Microinverter has removable serial number labels.
Peel labels off, affix one to the respective location on the APsystems
installation map, and fill in A,B in the label below(as figure27)
according to the layout on the roof(as figure 26). Then affix another
label to the PV module frame which is easy to see. The warranty cards
can obtain from the appendix of this manual or APsystems website
www.APsystems.com
e. Fill the warranty cards and email to APsystems at
[e-mail]
f. APsystems will create the EMA account and email you the account
information. Then you can use the EMA website to view detailed
performance of your PV system. You can learn more information on
energy monitoring and analysis system from APsystems website
www.APsystems.com
A
B
Figure 25
Figure 26

YC500A/I Installation/User Manual
17
YC500I Installation Procedures
1 2 34 5 6 7 89 10 11 12 13 14 15 1716 18 19 20 2221
APsystems Microinverter&Energy Communication Unit
Warranty Card
The APsystems Installation Map is a diagram of the physical location of each microinverter in your PV installation.
Each APsystems microinverter has a removable serial number label located on the mounting plate. Pee l the label
and affix it to the respective location on the APsystems installation map.
Installation Map Template
To register your APsystems microinverter, please mail this warranty registration card to: emasupport@altenergy-power com.
B A B A B A
Figure 27
NOTE: 1. The layout of the inverters' serial numbers on the warranty
card is only suitable for general arrangement.
2. Step 1~7 can be done in any order.
3. Warranty card is located in Appendix last page of this manual.
4. You can use Scanning Gun or mobile phone to scan the
serial numbers on the map when set ECU (see ECU manual).
5. Using apsystems' mobile app ArrayApp can make the
installation and registion much more simple.
Step 8 - Place a Warning Notice
A warning notice shall be placed in such a position that any person gaining
access to live parts will be warned in advance of the need to isolate those
live parts from all points of supply. Special attention should be paid that the
power supply, measuring circuits (sense lines) and other parts may not be
isolated from the network when the switch of the interface protection is open.
As a minimum, warning labels shall be placed:
On the switchboard (DNO panel and consumer unit) that has the
micro-generator connected to it;
On all switchboards in between the consumer unit and the micro-
generator itself;
On, or in the micro-generator itself;
At all points of isolation for the micro-generator.
Figure 28

YC500A/I Installation/User Manual
18
APsystems microinverter system operating instructions
To operate the APsystems microinverter PV system:
1. Turn ON the AC circuit breaker on each microinverter AC branch
circuit.
2. Turn ON the main utility-grid AC circuit breaker. Your system will
start producing power after a five-minute waiting time.
3. The units should start blinking green every 2 seconds five minutes
after turning on the AC circuit breaker. This means they are producing
power normally, but have not yet connected to the ECU. After the ECU
has been plugged in and acknowledges the Microinverters, they will
start to blink green every 10 seconds.
4. Plug in the ECU and follow the instructions according to the manual
for the ECU.
5. The APsystems Microinverters will start to send performance data over
power line to the ECU. The time required for all the Microinverters in the
system to report to the ECU will vary with the number of Microinverters
in the system. You can verify proper operation of the APsystems
Microinverters via the ECU. See the ECU Installation and Operation
Manual for more information.
NOTE: Once AC power is applied, about 0.1A current and 25VA(W)
power for each microinverter may be measured with a meter. This
Current and Power are Reactive. The inverters ARE NOT operating.
After an over 300s waiting time, the inverters will start operation.

YC500A/I Installation/User Manual
19
Troubleshooting
Qualified personnel can use the following troubleshooting steps if the
PV system does not operate correctly:
Status Indications and Error Reporting
Start up LED
One quick red light followed by three short green blinks when DC power
is first applied to the Microinverter indicates a successful Microinverter
startup.
Operation LED
Flashing Slow Green (10 sec. gap) - Producing power and communicating
with ECU
Flashing Fast Green (2 sec. gap) - Producing power and not
communicating with ECU over 60mins
Flashing Red - Not producing power
Steady Red - Electrode assembly ground fault protection
GFDI Error
A solid red LED indicates the Microinverter has detected a Ground Fault
Detector Interrupter (GFDI) error in the PV system. Unless the GFDI error
has been cleared, the LED will remain red and the ECU will keep reporting
the fault.
After the ground fault error is fixed, follow the instructions in the ECU
Installation and Operation Manual to clear this GFDI error reporting.
Other Faults
All other faults are reported to the ECU. Refer to the ECU
Installation and Operation Manual for a list of additional faults
and troubleshooting procedures.
WARNING: Only qualified personnel should directly handle the
APsystems microinverter.
WARNING: Never disconnect the DC wire connectors under
load. Ensure that no current is flowing in the DC wires prior to
disconnecting. An opaque covering may be used to cover the module
prior to disconnecting the module.
WARNING: Always disconnect AC power before disconnecting
the PV module wires from the APsystems microinverter. Either
disconnecting by the appropriate AC circuit breaker or unplugging
the first AC connector of the first Microinverter in a branch circuit
is suitable as a means of disconnection.
WARNING: The APsystems microinverter is powered by PV module
DC power. AFTER disconnecting the DC power, when reconnecting
the PV modules tothe Microinverter, be sure to watch for the three
short LED flashes.