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Slide 1
Dave StrenskiMarch 2012
Birth and Death of a Solar Electron
He was alwaysso negativeBaby minus
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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!
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KWH
Sunny Boy
325
KWH
KWH
ForwardMeter
ReverseMeter
Gen Meter
sun2005 2005 2005 2005 2007 2008
2008 2008 2008 2008 2008 2008
100 9885 534
327
store meters
disconnect inverter
photovoltaic panels
breaker panel
utility meters
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Steeper for more uniform annual powerFlatter for maximum annual power
Tracking systemsSeasonal fixed panelsFixed panels
Silicon [Si]
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+ n14 neutrons
14 protons
shell 1
shell 2
shell 3
valence electrons
Silicon [Si]
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+ n14 neutrons
14 protons
shell 1
shell 2
shell 3
valence electrons
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wires o
n the
top
wires on the bottom
silicon doped with boron(holes, few less electrons)
silicon doped with phosphorus(few extra electrons)
Building a Solar Cell
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+-
+- +-
+-
+-
holes migrate down
phot
ons
phot
ons
phot
ons
phot
ons
phot
ons
electronsmigrate up
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Uni-solarMade in Michigan
Amorphous Silicon
Mono and Polycrystalline Silicon
Slide 12
KWH
Sunny Boy
325
KWH
KWH
ForwardMeter
ReverseMeter
Gen Meter
sun2005 2005 2005 2005 2007 2008
2008 2008 2008 2008 2008 2008
100 9885 534
327
store meters
disconnect inverter
photovoltaic panels
breaker panel
utility meters
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UL listedClean power
Shuts offs if grid is downPowered by solarQuite and Cool
Displays power generated
DC in
AC out
time
volt
age AC
volt
age DC
time
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Standard breaker240 volt, 20 amp
back fed
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4:00 am
OFF
forwards
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8:00 am
direct
current
alternating
current
forwards
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11:00 am
direct
current
alternating
current
forwards
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1:00 pm
direct
current
alternating
current
backwards
Utility supplies power to the transmission lines
Power is distributed to the neighborhood
Solar panels start generating power
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Utility supplies power to the transmission lines
Power is distributed to the neighborhood
Solar panels start generating power
One less shovelful of coal is needed at the utility power plant
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In to the store
Out of the store
Generatedfrom panels
data
to la
ptop da
ta to
lapt
op
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Solar Economics2000 sq. ft. home440 KWH/month (average)16c per KWH (2011)440/30 = 14.7 KWH (day), round up to 15 KWH per day on average
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323 Oak Street, Ypsilanti
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
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Solar Economics
4 hour of sun per day, assumes panels are facing south tilted at latitude.Assume 80% system efficiency15 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. home440 KWH/month (average)16c per KWH (2011)440/30 = 14.7 KWH (day), round up to 15 KWH per day on average
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Solar installation cost = $3 to $7/watt installed4500w * $3/w = $13,500 4500w * $7/w = $31,500Minus 30% federal tax credit $13,500 * 0.7 = $9,450 $31,500 * 0.7 = $22,050
Cost of electricity for 440kwh/month
Solar Economics
yrs 16c 18c 20c 22c
5 $4,224 $4,752 $5,280 $5,808
10 $8,448 $9,504 $10,560 $11,616
15 $12,672 $14,256 $15,840 $17,424
20 $16,896 $19,008 $21,120 $23,232
25 $21,120 $23,760 $26,400 $29,040
4 hour of sun per day, assumes panels are facing south tilted at latitude.Assume 80% system efficiency15 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. home440 KWH/month (average)16c per KWH (2011)440/30 = 14.7 KWH (day), round up to 15 KWH per day on average
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Costs are coming down, and volumes are going up.
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¼ useful
3/4 wasted
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Ypsilanti Solar Photovoltaic Case Studies
Slide 32Shadow (bad)
190 watts 54.8 max volt 3.47 max amp 31 pounds 35.3” x 51.9” $1000
Ypsilanti Food Cooperative – 2005312 River Street, Ypsilanti, Michigan
190 x 4 = 760 watts$6000 ($7.90/watt)
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Ypsilanti Food Cooperative – 2007312 River Street, Ypsilanti, Michigan
190 x 5 = 950 watts$1000 upgrade ($7.37/watt)
No shadows
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Ypsilanti Food Cooperative – 2009312 River Street, Ypsilanti, Michigan
190 x 12 = 2280 watts$9,500 upgrade ($7.24/watt)
unused inverter , -$500 ($7.00/watt)
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Ypsilanti Food Cooperative – 2010312 River Street, Ypsilanti, Michigan
White roof added later.Should improve reflectivity.
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City of Ypsilanti, City Hall – 20101 South Huron, Ypsilanti, Michigan
205 x 12 = 2460 watts$27,300 ($11.10/watt)
Extra cost due to location, and engineering services
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River Street Bakery – 2011312 River, Ypsilanti, Michigan
200 x 30 = 6000 watts$44,000 ($7.33/watt)
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Adams School – 2011312 River, Ypsilanti, Michigan
240 x 10 = 2400 watts
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Solar Ypsilanti: SolarYpsi.orgYpsilanti Food Cooperative: 734-483-1520 YpsiFoodCoop.orgCity of Ypsilanti: 734-483-1100 CityofYpsilanti.com
Federal Tax Incentives: www.energy.gov/taxbreaks.htmDTE Energy Solar Currents: www.dteenergy.com/solar
Great Lakes Renewable Energy Association: www.glrea.orgMidwest Renewable Energy Association: www.the-mrea.org
HomePower magazine: www.homepower.comSolar Today magazine: www.solartoday.orgSolar Tour: www.nationalsolartour.org
