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Cambridge City Hall Annex

System Details

Location	Cambridge, MA   Map
Capacity	26.950 KWdc, 24.255 KWac
Commissioned Date	August 20, 2004
Monitoring Method	Soltrex
Array Azimuth	180°   What's this?
Array Tilt	1°   What's this?

Module Make and Model	Module Wdc	Quantity	Total Capacity (KWdc)
Evergreen EC-110	110	245	26.950
Inverter Make and Model	Inverter Wac	Quantity	Total Capacity (KWac)
SMA Sunny Boy 1800U	1800	17	30.600

Latest Graph Data

Showing: Power output in kilowatts (kW)
		Choose a graph: Power Output 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	1066	1509	2414	2734	3262	3252	3282	2964	2369	1762	1040	853	26,507
2009 Actual kWh 2009 Ratio to Model	0 0.00	1,132 0.75	2,000 0.83	2,350 0.86	2,778 0.85	2,652 0.82	0 0.00						10,912 0.62
2008 Actual kWh 2008 Ratio to Model	832 0.78	993 0.66	2,101 0.87	2,775 1.02	3,174 0.97	2,809 0.86	3,016 0.92	2,665 0.90	2,000 0.84	1,672 0.95	900 0.87	435 0.51	23,373 0.88
2007 Actual kWh 2007 Ratio to Model	926 0.87	1,399 0.93	2,268 0.94	2,210 0.81	3,332 1.02	3,056 0.94	3,198 0.97	3,106 1.05	2,531 1.07	1,557 0.88	1,026 0.99	531 0.62	25,141 0.95
2006 Actual kWh 2006 Ratio to Model	738 0.69	1,586 1.05	2,539 1.05	2,894 1.06	2,720 0.83	2,480 0.76	3,167 0.97	2,953 1.00	2,189 0.92	1,698 0.96	867 0.83	765 0.90	24,597 0.93
2005 Actual kWh 2005 Ratio to Model			1,236 0.51	3,027 1.11	2,459 0.75	3,250 1.00	3,491 1.06	14,747 4.98	2,529 1.07	1,391 0.79	1,124 1.08	701 0.82	33,955 1.42

Energy/Pollution Equivalents

 Since monitoring began, this system has produced 117,978 kWh of electrical energy.

Enough electricity for...		More electricity equivalents
3,470 Americans' electricity needs for one day.	9,075,235 hours use of an energy-efficient CFL light bulb.	7,150,185,333 minutes yakking on a mobile phone.
And offsetting...		More pollution equivalents
105,839 lbs. of CO2 emissions, the main cause of global warming.	115,773 miles worth of CO2 emissions from the average American car.	158 trees cut down, given their capacity to absorb CO2.