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Harvard University - Petersham

System Details

Location	Petersham, MA   Map
Capacity	10.200 KWdc, 9.180 KWac
Commissioned Date	July 11, 0007
Monitoring Method	Soltrex
Array Azimuth	180°   What's this?
Array Tilt	45°   What's this?

Module Make and Model	Module Wdc	Quantity	Total Capacity (KWdc)
Evergreen ES-170	170	60	10.200
Inverter Make and Model	Inverter Wac	Quantity	Total Capacity (KWac)
SMA 6000U	6000	2	12.000

Latest Graph Data

Showing: Power output in kilowatts (kW)
		Choose a graph: Power Output Sunlight Custom... Unit Converter

Modeled vs. Measured Energy

PV Energy (kWh)	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Tot
Modeled kWh	794	919	1193	1131	1164	1092	1129	1139	1055	1011	710	681	12,018
2010 Actual kWh 2010 Ratio to Model	653 0.82	252 0.27											904 0.53
2009 Actual kWh 2009 Ratio to Model	706 0.89	959 1.04	1,354 1.14	1,318 1.17	1,225 1.05	1,022 0.94	1,267 1.12	1,343 1.18	1,248 1.18	720 0.71	668 0.94	516 0.76	12,346 1.03
2008 Actual kWh 2008 Ratio to Model	706 0.89	714 0.78	1,199 1.01	1,379 1.22	1,374 1.18	1,142 1.05	1,334 1.18	1,348 1.18	1,106 1.05	960 0.95	542 0.76	331 0.49	12,134 1.01
2007 Actual kWh 2007 Ratio to Model							846 0.75	1,380 1.21	1,335 1.27	837 0.83	638 0.90	412 0.60	5,448 0.95

Energy/Pollution Equivalents

 Since monitoring began, this system has produced 30,833 kWh of electrical energy.

Enough electricity for...		More electricity equivalents
907 Americans' electricity needs for one day.	2,371,772 hours use of an energy-efficient CFL light bulb.	1,868,668,788 minutes yakking on a mobile phone.
And offsetting...		More pollution equivalents
27,661 lbs. of CO2 emissions, the main cause of global warming.	30,257 miles worth of CO2 emissions from the average American car.	41 trees cut down, given their capacity to absorb CO2.