MICROINVERTER - solargain.com.au · STRING INVERTER VS MICROINVERTER METER GRID AC J-BOX...
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MICROINVERTER - Pushing the Envelope in Technology and Applications Zhi-MinLing， Ph.D. , CEO
Transcript of MICROINVERTER - solargain.com.au · STRING INVERTER VS MICROINVERTER METER GRID AC J-BOX...
MICROINVERTER -Pushing the Envelope in
Technology and Applications
Zhi-MinLing， Ph.D. , CEO
Page 2
OBJECTIVES
Why Microinverter?
Why APS?
Page 3
STRING INVERTER VS MICROINVERTER
METER
GRID
AC J-BOX
Microinverter
STRING INVERTERPV panels connect in a series to
form a string, which then connects
to the string inverter.
MICROINVERTEREach PV panel is connected to one
microinverter, so each panel is
independently controlled and
monitored.
Page 4
MARKET FORECAST
In 2010, 2% of residential
PV systems used MLPM
solutions. By 2014, that
number will reach 38%.
In 2010, microinverter
installation was about
80MW. By 2014
Microinverter
installations will reach
3GW.
Page 5
MICROINVERTER IN CA. USA
(<10KW SYSTEM)
Enphase Energy Market Share – 3 Month Moving Average;
A residential solar installation consists of 5 to 50
microinverters; a small commercial solar installation
consists of 50 to 500 microinverters.
Page 6
MICROINVERTER ADVANTAGES
• Design and installationSIMPLE
• No high DC voltageSAFE
• Monitor and control each panelSMART
• No DC componentSAVE
• Component and systemRELIABLE
• Maximum power for each panelPOWERFUL
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#1 ADVANTAGE: The Safe Solar Solution
MODULE ARRAY
STRING INVERTER
600V DC
。。STRING INVERTER SYSTEMS600V DC travels between the PV array and the inverter.
•Lethal to humans
•High risk of DC arc faults
According to UL, almost all PV-related fire accidents
are caused by arcing.
DC output is constant if the solar panels are exposed
to sunlight.
220V AC
。。
MODULE ARRAYMICROINVERTER SYSTEMS220V AC travels between the microinverter and the
electrical panel.
• No danger to humans
• Low risk of DC arc faults
No DC output occurs until the unit is connected to the
AC grid.
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ARCING HAZARD
Solar System is very safe, if it’s done properly.
However, high DC voltage is more susceptible to
the arcing risk.
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#1 ADVANTAGE: The Safe Solar Solution
MODULE ARRAY
STRING INVERTER
600V DC
。。STRING INVERTER SYSTEMS
At emergency, string inverter disconnected from
grid, it’s no AC output, however, DC side is still
600V-1000V
40V DC。。
MODULE ARRAYMICROINVERTER SYSTEMS
At emergency, microinverter disconnected from
grid, it’s no AC output, DC side is only
30V-40V.
Page 10
MICROINVERTERS INCREASE SOLAR POWER OUTPUT
MPPT for each solar module
No module mismatch power losses
No variation effect from tile angle or installation orientation
Minimized shading effect
Independently-controlled solar modules
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Microinverter and String inverter systems
8 250W module with 8
microinverter
8 250W modules with
SMA string inverter
(Sunpower SPR 3000m)
Courtesy: Dr. Yu Ma, Eoplly, July 2012
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Microinverter
Compariable Power Production
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Microinverter
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2 Cells Covered partial
Shading
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Microinverter
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Microinverter
MI: 2.94kwh (+3.4%)
SI: 2.84kwh
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Object shading,
e.g., chimney
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Microinverter
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Microinverter
MI: 2.79kwh (+43%)
SI: 1.95kwh
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Dirty shading,
simulated by a semi-
transparent foil.
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Microinverter
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MI: 1.69kwh (+27%)
SI: 1.37kwh
Page 23
ENERGY HARVEST
Enphase Microinverter, total 143 systems, 6 months operation
data. Microinverter is about 8-10% more than PVWatts
predicted, and 16% more than string inverter produced.
Page 24
OBJECTIVES
Why Microinverter?
Why APS?
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Leading the industry in Solar Micro inverter Technology
Founded in Silicon Valley, USA
The 1st Microinverter certified in Australia
The #1 Microinverter volume shipment in Australia
At Sunrise, APS POWER UP !
Page 26
APS COMPANY GOGRAPHIC PROFILE
1) 09/2009
2) 03/2010
3) 07/20105) 02/2012
4) 09/2011
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APS COMPANY MILESTONES
2011/05
China 120kw2011/09
AU Melbourne
2012/03
Made-in-Washington
Certificates
Development
Milestones
2010/11
China 4kw
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40+ R&D engineers, over 60%
hold an MS degree or higher.
Full range of equipment for product
design, simulation, verification,
testing, and reliability.
Filed 35 patent applications,
including 6 PCT applications; 15
granted.
APS created the first microinverter
product in the world
that was certified by
CQC, SAA, TUV,
and UL.
RESEARCH AND DEVELOPMENT
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Manufacturing Capability
• EMS Partnership • 10 years experiences in communication equipment manufacturing
• qualified 300,000 capacity (SMT+DIP lines)
• APS NPI team
• > 10 years industrial experience
• Certified ISO9001:2008
• Implemented OA and ERP in daily operations
Page 30
QUALITY MANAGEMENT SYSTEM
QUALITY CONTROL WORKFLOW
COMPONENT PCBA ASSEMBLYBURN-
IN(50C, 24h, power on)
PACKING & SHIPPING
IQCIncoming
Quality
Control
X-ray Soldering
quality
control
E-Test IC chip
placement
quality
control
InspectAssembly
quality
control
Final TestsFunctional, perfor
mance, and
safety tests
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DESIGN FOR RELIABILITY
20 years of experience in microelectronics design and manufacturing in
silicon valley.
Implemented advanced digital, high frequency, low power, embedded
software and solid state technology in product design
Used thermal conductive potting materials
Page 32
TECHNOLOGY ROADMAP
Energy Management
Mic
roin
ve
rter
YC200
YC500
GEN-3
GEN-4
ECU-1/2 ECU-3 ECU-4
Page 33
PRODUCT ROADMAP
Co
st
（norm
aliz
ed
）
Unit vol – power (watt/cm^3)
0.20 0.40
YC200
YC250
YC500
30% cost reduction，50% vol/watt reduction
Page 34
YC250 - ACM PREFERED CHOICE
L(CM) W(CM) H(CM) V（CM^3) Ratio
APS YC250 16.0 15.0 2.5 600.0 100%
Enphase M215 17.3 16.5 2.5 713.6 119%
SolarBridge P235 20.0 16.3 3.13 1020.4 170%
Light、Small、Thin、High reliability 、Low
cost.
YC250
M215
P235
Page 35
YC500 – THE PREFERED CHOICE
L(CM) W(CM) H(CM) Vol（CM^3) Ratio
APS YC500 22.0 16.4 2.5 900.0 100%
Enphase D380 30.8 15 3.3 1524.6 170%
Enecsys D480W 26.2 21.1 3.94 2178 240%
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YC500 ARCHITECTURE
Each panel has its
own independent
MPPT and monitoring
features.
交流市电
FPGA控制芯片
光耦隔离
DC to DC DC to AC EMI滤波
太阳能板
YC500太阳能微型逆变器系统框图
DC to DC
太阳能板
电板数据采集
控制信号
电板数据采集
控制信号
电网数据采集
控制信号
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COMMUNICATION PLATFORM (MI -> ECU)
Microinverter to ECU:
Power Line Carrier (PLC)
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COMMUNICATION PLATFORM (ECU - SERVER)
ECU (data) to Server (3 options):
LAN, WiFi via Router to Server
GPRS to Server
Page 39
EMA OPERATION SYSTEM & DISPLAYS
EMA
OSAndroid
GalaxyS3Ipad/ IphonePC
Display Devices
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APS MICROINVERTER MONITOR CURVESA
C o
utp
ut (W
)
DC
Input (I)
Outp
ut (k
wh)
DC
Iuput(V
)
AC
Outp
ut (V
)
Inte
rnal T
em
p (C
)
Page 42
COMPREHENSIVE RELIABILITY TEST
IEC61215 stress test cumulatively on 4 samples
Humidity Freeze
Damp Heat
Temp Cycles
85C/85% RH
20hrs，-40C
4hrs,10 cycles
85C/85% RH
1000hrs
-40C ~
+85C, 200
cycle；
Performance and safety Test
No Degradation : Δ eff < 0.15%
Page 43
Perform startup test for -40C~+65C, NO failure for ~100k times.
10/10/2012
STARTUP TEST
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Hi-TEMPERATURE OPERATION
10/10/2012
UID AC Outputpower (W)
Power Factor THD Efficiency (%)
#1 215.45 0.9929 2.3 94.67
#2 217.37 0.9929 3.15 94.5
#3 219.63 0.9953 3.83 94.13
#4 217.23 0.9964 2.27 94.36
High-T operation, at full AC power output, for 2000 hrs
• +65C，220W Pac
• No degradation after 2000hrs。
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YC200 TEMPERATURE IN ROOFTOP SYSTEM
Max Ambient air temperature: in noon is ~37oC)
Max Microinverter Internal Temp: 62oC
Page 46
APS YC500 EFFICIENCY
Negligible temperature dependence
80%
85%
90%
95%
100%
0 100 200 300 400 500
Eff
icie
ncy
AC Output Power（W)
APS YC500 Efficiency
-40C
+25C
+65C
THE MICROINVERTER COMPANY
RECENT PROJECTS -
EXAMPLES
Page 48
Queensland -RESIDENTIAL ROOFTOP
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Melbourne 20KW COMMERICAL ROOFTOP
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– Collaborated with partners
in Washington State
– Qualified as Made-in-
Washington Microinverter
– Installed 100+ systems in
Washington State in last 3
months.
MADE-IN-WASHINGTON
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APS – AT OnePlanetCommunity, USA
APS chosen for largest net zero residential project in the
Pacific North West, USA.
The project locates in Grow Community which would be the
biggest Zero-Carbon community in WA by 2020.
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120KW OFFICE BUILDING ROOFTOP
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LEATHER SHOPPING MALL 300KW SYSTEM
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SYSTEM ELECTRICAL DRAWING
22 panels per
string.
AC combine box
grid connected
combine box.
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POWERED BY 600 YC500 MICROINVERTER
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AC COMBINER ONLY (NO DC)
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AC COMBINER ONLY (NO DC)
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COMUNICATIONS (ECU + GPRS)
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THANK YOU !
