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Birth and Death of a Solar Electron. He was always so negative. Baby minus. Dave Strenski March 2012. Renewable Energy and a Renewed Economy for Michigan February 29, 2008 by Senator Glenn S Anderson

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Birth and Death of a Solar Electron

He was always

so negative

Baby minus

Dave Strenski

March 2012


Renewable Energy and a Renewed Economy for MichiganFebruary 29, 2008 by Senator Glenn S Anderson

“Consumers, businesses and manufacturers in Michigan currently pay $18 billion each year to import coal, oil and natural gas. Of that $18 billion we import 100% of the coal we use, 96% of the oil we consume for transportation fuels and 75% of our natural gas from other states. That money heads across the border each year to help workers and businesses in other states, and it does nothing to reduce our dependence on fossil fuels, lower greenhouse gas emissions, diversify our state's economy or create jobs here in Michigan.”

http://bloggingformichigan.com/archives/bfm/www.bloggingformichigan.com/showDiarye324.html

Could add $18 billon to Michigan’s economy every year!

Slide 2


sun

Sunny

Boy

KWH

KWH

KWH

325

100

534

9885

327

2005

2005

2005

2005

2007

2008

photovoltaic panels

2008

2008

2008

2008

2008

2008

Forward

Meter

Reverse

Meter

disconnect

inverter

utility meters

Gen Meter

store meters

breaker panel


Tracking systems

Seasonal fixed panels

Fixed panels

Steeper for more uniform annual power

Flatter for maximum annual power


n

+

Silicon [Si]

shell 3

14 protons

14 neutrons

shell 1

shell 2

valence electrons


n

+

Silicon [Si]

shell 3

14 protons

14 neutrons

shell 1

shell 2

valence electrons


Building a Solar Cell

wires on the top

silicon doped with phosphorus

(few extra electrons)

silicon doped with boron

(holes, few less electrons)

wires on the bottom


+

+

+

+

+

-

-

-

-

-

photons

electrons

migrate up

photons

photons

photons

photons

holes migrate down


Mono and Polycrystalline Silicon

Amorphous Silicon

Uni-solar

Made in Michigan


sun

Sunny

Boy

KWH

KWH

KWH

325

100

534

9885

327

2005

2005

2005

2005

2007

2008

photovoltaic panels

2008

2008

2008

2008

2008

2008

Forward

Meter

Reverse

Meter

disconnect

inverter

utility meters

Gen Meter

store meters

breaker panel


UL listed

Clean power

Shuts offs if grid is down

Powered by solar

Quite and Cool

Displays power generated

AC

DC

voltage

voltage

time

time

AC out

DC in


Standard breaker

240 volt, 20 amp

back fed


4:00 am

forwards

OFF


8:00 am

forwards

direct

current

alternating

current


11:00 am

forwards

direct

current

alternating

current


1:00 pm

backwards

direct

current

alternating

current


Power is distributed to the neighborhood

Utility supplies power to the transmission lines

Solar panels start generating power


One less shovelful of coal is needed at the utility power plant

Power is distributed to the neighborhood

Utility supplies power to the transmission lines

Solar panels start generating power


Generated plant

from panels

In to the store

data to laptop

data to laptop

Out of the store

Slide 21


2000 sq. ft. home plant

440 KWH/month (average)

16c per KWH (2011)

440/30 = 14.7 KWH (day), round up to 15 KWH per day on average

Solar Economics


323 Oak Street, Ypsilanti plant

Avg KWH per month = 440

$50.93 / 367 = $0.139/kwh

$43.09 / 269 = $0.160/kwh

$37.60 / 218 = $0.173/kwh

$48.18 / 308 = $0.156/kwh

Avg = $0.157/kwh


2000 sq. ft. home plant

440 KWH/month (average)

16c per KWH (2011)

440/30 = 14.7 KWH (day), round up to 15 KWH per day on average

Solar Economics

4 hour of sun per day, assumes panels are facing south tilted at latitude.

Assume 80% system efficiency

15 KWH / 4 hr * 1.2 = 4.5 KW (added 20% for efficiency)

4500 watt would be about 18 solar panels at 250w per panel.


2000 sq. ft. home plant

440 KWH/month (average)

16c per KWH (2011)

440/30 = 14.7 KWH (day), round up to 15 KWH per day on average

Solar Economics

4 hour of sun per day, assumes panels are facing south tilted at latitude.

Assume 80% system efficiency

15 KWH / 4 hr * 1.2 = 4.5 KW (added 20% for efficiency)

4500 watt would be about 18 solar panels at 250w per panel.

Solar installation cost = $3 to $7/watt installed

4500w * $3/w = $13,500 4500w * $7/w = $31,500

Minus 30% federal tax credit

$13,500 * 0.7 = $9,450 $31,500 * 0.7 = $22,050

Cost of electricity for 440kwh/month



3 plant/4 wasted

¼ useful



Ypsilanti Food Cooperative – 2005 plant

312 River Street, Ypsilanti, Michigan

190 x 4 = 760 watts

$6000 ($7.90/watt)

190 watts

54.8 max volt

3.47 max amp

31 pounds

35.3” x 51.9”

$1000

Shadow (bad)


Ypsilanti Food Cooperative – 2007 plant

312 River Street, Ypsilanti, Michigan

190 x 5 = 950 watts

$1000 upgrade ($7.37/watt)

No shadows


Ypsilanti Food Cooperative – 2009 plant

312 River Street, Ypsilanti, Michigan

190 x 12 = 2280 watts

$9,500 upgrade ($7.24/watt)

unused inverter , -$500 ($7.00/watt)


Ypsilanti Food Cooperative – 2010 plant

312 River Street, Ypsilanti, Michigan

White roof added later.

Should improve reflectivity.


City of Ypsilanti, City Hall – 2010 plant

1 South Huron, Ypsilanti, Michigan

205 x 12 = 2460 watts

$27,300 ($11.10/watt)

Extra cost due to location,

and engineering services


River Street Bakery – 2011 plant

312 River, Ypsilanti, Michigan

200 x 30 = 6000 watts

$44,000 ($7.33/watt)


Adams School – 2011 plant

312 River, Ypsilanti, Michigan

240 x 10 = 2400 watts


Solar Ypsilanti: plant SolarYpsi.org

Ypsilanti Food Cooperative: 734-483-1520 YpsiFoodCoop.org

City of Ypsilanti: 734-483-1100 CityofYpsilanti.com

Federal Tax Incentives: www.energy.gov/taxbreaks.htm

DTE Energy Solar Currents: www.dteenergy.com/solar

Great Lakes Renewable Energy Association: www.glrea.org

Midwest Renewable Energy Association: www.the-mrea.org

HomePower magazine: www.homepower.com

Solar Today magazine: www.solartoday.org

Solar Tour: www.nationalsolartour.org


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