The document discusses a solar power system design for a Solar Decathlon competition. It provides an overview of the design philosophy, considerations and constraints of the project. It then compares different inverter models and iterations before describing the selected "StorEdge Model" in more detail. This includes descriptions of its core functionality, innovative features, and forward compatibility. Diagrams and specifications are given for the proposed layout and integration of solar panels, optimizers, inverters and battery storage in the mechanical room and on the roof. Electrical components and load calculations are listed, and additional reference documents are provided.

1. Solar
Decathlon 2017
The PV team, a primer
UNIVERSITY OF MARYLAND – COLLEGE
PARK
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2. Contents
Introduction: Design philosophy
Considerations and Constraints
Comparing models and iterations
The StorEdge Model:
◦ Core Functionality
◦ Salient, innovative features
◦ Forward integrability
Location of setup
Interface with systems
Appendix and additional references
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3. Introduction: Design
philosophy
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Reliability
Scalability
Futuristic
Autonomous
Modular

4. Considerations and
Constraints
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• Constrains Power productionRoof Orientation
• Further limits production to
10kWPermit Restrictions
• Evolving rules and standards
bias electrical design flexibilityNEC guidelines
• Qualifies Electrical design
flexibilityIlliberality of Space
• Trade-off between availability
and excellenceAvailability

5. Comparing models and
iterations
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Micro-inverter
+ Scalable
+ Futuristic
+ Autonomous
+ Modular
- NOT easily
made reliable
String-inverter
+ Reliable
+ Scalable
- Not futuristic
- Not modular
- Not
autonomous
DC-DC
optimizer
+ Reliable
+ Scalable
+ Futuristic
+ Autonomous
+ Modular

6. The StorEdge Model
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7. Location of setup
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PV panels: Roof sections
Optimizers: Integrated with the panels
Inverter: Mech room
Tesla PowerWall: Mech Room

8. Interface with systems
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•Apart from providing power to meet the
energy demands of various sub-systems,
the power system also exports/sells
excess power to the grid or stores it in the
battery.
•The battery can be used to provide backup
power during grid outages as well as to
sell back to the grid when it is most
profitable.

9. Appendix and additional
references
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ELECTRICAL BILL OF MATERIALS
Invoice For: Solar Decathlon '17
Item # Description Qty Unit Price Discount Price
X21-335 BLK SunPower BLK Panels 28.00 $1,882 $52,696
P400 DC-DC optimizer 28.00 $76 $2,128
SE 7600A-USS StorEdge Inverter 1.00 $2,542.55 $2,542.55
TESLA
POWERWALL
Storage Battery 1.00/2.00 $3,000/$5,500 $3,000/$5,500
Square D
Homeline
150A, 30-Space 60-Circuit Panel 2.00 $102 $204
TOTAL 60,570.00$
TOTAL 63,070.00$
Total due without considering discounts
P: Phone Number
F: Fax Number
Email
Website
Street Address
City, State ZIP Code

10. Load calculations
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220.12+220.42
220.11(C)(1)+220.52(A)
220.11(C)(2)+220.52(B)
220.54
Table 220.19
220.14(C)
Total = 24,281VA
MAIN BREAKER RATING = 100A
550 VA
2400 VA
MULTIPLIER/DEMAND TOTAL (STANDARD METHOD)
General Lighting 1166 sq ft. x 3VA = 3498 VA
5000@ 100% 5000 VA
3000@ 100% 4998@ 35% 4750 VAmin. 2 x 1500VA = 3000VA
Laundry Circuit 1 circuit @ 1500 VA
LOAD TYPE LOAD VALUE (VA)
Hot water heater
Small Appliance branch circuit
184VA
146VA
550 VA@ 100%
2400 VA@ 100%
Electric Dryer 1 Dryer @ max( 5000 VA, nameplate rating)
Fixed-appliance loads total = 1400 (for dishwasher) + 7200 (for EV
charger) +16 (for UV lamp) + 5020 (for water heater) = 13,636VA
Total of 4 fixed appliances @ 75%
1 range @ 13300 VA
max(2490 W for heating, 2310W for cooling) = 2490W
8000 VA + 5%(8000) = 8400VA
2490VA
184VA
143W+3VA
Electric Range
Mini split indoor units (x4)
ERV unit + Drum Humidifier
Dishwasher
Mini-split condenser unit
EV charger
Pump (SCALA)
Pump (BMQ)
UV Lamp
WIRE SIZE:
2/0 AWG Alu or 1 AWG copper
Highest motor load 2400VA 2400@25% 600VA
TOTAL = 45,704 VA
220.53
Total = 34,747VA
OPTIONAL METHOD
Total of 45,704VA: 10,000VA @
100% 35,704VA @ 40%
MAIN BREAKER RATING = 150A
NEC ref.
184VA
146VA
550 VA
2400 VA
2490VA
8400 VA
10227 VA

11. Some useful documents
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Inverter Data-sheet
http://www.solaredge.com/sites/default/files/single_phase_storedge_solutions_datasheet_na.pdf
Consumption Monitoring using StorEdge
http://www.solaredge.com/sites/default/files/consumption_monitoring_na.pdf
Programming the charge-discharge profiles
http://www.solaredge.com/sites/default/files/storedge_charge_discharge_profile_programming.pdf
Using 3rd party gateways for monitoring
http://www.solaredge.com/sites/default/files/storedge_monitoring_and_control_using_non_solarege_gateways.pdf
Connection and installation of the system
http://www.solaredge.com/sites/default/files/storedge_applications_connection_and_configuration_guide_na.pdf
Installing the electricity meter
http://www.solaredge.com/sites/default/files/electricity_meter_installation_guide_na.pdf

12. In case of any questions/comments,
please feel free to ask away or
mailto: srijeshs@terpmail.umd.edu
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Congrats, you’ve made it!