2KW Solar Installation for the Ypsilanti Freighthouse.

Strenski – September 18, 2012

3

13.16

The roof has a 1 over 3 pitch or about an 18.5o angle.

18.5o

N

53o

233o

The roof’s ridge line is angled 37o to the west. This gives the roof two pitches; one with an azimuth of 53o and one with an azimuth of 233o.

NE

SW

Wiring would be done under ridge cap.

The roof would be two colors.

Propose using Michigan made Uni-Solar PVL-136 solar panels on a raised seamed metal roof. The roof would look similar to these pictures.

3

13.

16

26.3

fee

t

190 feet

7 feet

7 feet

3 feet3 feet

36 feet

184 feet

25 feet

Using a slope of 1/3, each roof face is 190 by 26.3 for a totalof about 5000 sq-ft per face, 10,000 sq-ft for the entire roof.

Uni-solar 136-PVL comes in 18 foot lengths and 15.5 inches wide.We would install 16 panels on the South West corner of the roof.16 * 136 watts = 2.176 KW system (peak)Each panel cost $65. Total panel cost would be (16 * 65) = $1040Would need one Sunny Boy 2000HF-US inverter, which cost about $1500

Building

Roof

Top view of roof

Part Quantity $/unit Total

Panels/Inverter Uni-Solar PVL-136 16 $65.00 $1,040.00 SunnyBoy 2000HF-US inverter w/ DC disconnect 1 $1500.00 $1,500.00 Rack Zero rack cost 0 $0.00 $ 0.00

Labor Assume volunteer labor 0 $0.00 $ 0.00 Electrian 8hr $80.00 $ 640.00

Grounding Grounding rod, needed to ground the rack 1 $15.00 $ 15.00 Grounding wire, 500 feet spool 1 $200.00 $ 200.00 Lighting arrestor, one for each string 1 $60.00 $ 60.00

Wiring Generation utility meter socket 1 $50.00 $ 50.00 AC disconnect 1 $50.00 $ 50.00 10 gage, THHN stranded wire (red) 500’ 1 $100.00 $ 100.00 10 gage, THHN stranded wire (black) 500’ 1 $100.00 $ 100.00 10 gage, THHN stranded wire (green) 500’ 1 $100.00 $ 100.00 Conduit, conduit connectors 1”x10’ 10 $5.00 $ 50.00

Permits Building permit 1 $100.00 $ 100.00 Electrical permit 1 $100.00 $ 100.00 HDC permit 1 $20.00 $ 20.00 DTE Energy co-generation permit 1 $100.00 $ 100.00

Total $4,225.0030% Federal tax credit $(1,267.50)

Actual cost $2,957.50

Using the NREL’s PV-Watt program to calculate energy production, this installation will produce about $285 a year using the current rate of $0.12/KWH.

6.912 + 5.003 = 11.9c

Installation cost = $2957.50 (may be cheaper with new Solar Current’s program)Dollars generated during the first year @ $0.12/KWH = $285.00

Assuming a fixed price of 12c, the installation will pay for itself in ($2957.50/$285) 10.4 years.

Assuming a 4% inflation rate for electrical power, the solar installation should pay for itself in 9 years.

Year Gen Total 1 $285.00 $ 285 2 $296.40 $ 581 3 $308.26 $ 890 4 $320.59 $1210 5 $333.41 $1544 6 $346.75 $1890 7 $360.62 $2251 8 $375.04 $2626 9 $390.04 $3016 10 $405.64 $3422

The solar installation has an expected usable life of 30 years.