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Answer Keys

Sun Path Questions

Anything within an hour is OK

How many hours of sunlight does Portland, OR receive each day in December?	9
How many hours of sunlight does Atlanta receive each day in May?	14
How many hours of sunlight does Minneapolis receive each day in December?	9
How many hours of sunlight does Trenton receive each day in July?	14.5
How many hours of sunlight does Annapolis receive each day in December?	9.5
How many hours of sunlight does Milwaukee receive each day in October?	11
How many hours of sunlight does Phoenix receive each day in April?	13
How many hours of sunlight does Anchorage receive each day in January?	6.5
How many hours of sunlight does Portland, ME receive each day in July?	15
How many hours of sunlight does Jackson receive each day in January?	10
How many hours of sunlight does Boston receive each day in November?	9.5
How many hours of sunlight does Boise receive each day in December?	9
How many hours of sunlight does Honolulu receive each day in November?	11
How many hours of sunlight does Anchorage receive each day in June?	19
How many hours of sunlight does Chicago receive each day in July?	14.5
How many hours of sunlight does Charlotte receive each day in May?	14
How many hours of sunlight does Casper receive each day in February?	10.5
How many hours of sunlight does Manchester receive each day in July?	14.5

Solar Panel Questions

Anything within 10% of these answers are OK

Jackson in October over 28 days, using 9 Suntech STP240-20W/d panels?	28 × 9 × 2.78 × 11 × 1.627 = 12,537
Tulsa in June over 24 days, using 4 ET M660260WW panels?	24 × 4 × 6.32 × 14.5 × 1.627 = 14,312
Portland, ME in January over 3 days, using 8 ET M660235WW panels?	3 × 8 × 1.38 × 9 × 1.627 = 485
Jackson in June over 25 days, using 9 Mitsubishi PV-UJ230 panels?	25 × 9 × 5.93 × 14.5 × 1.648 = 31,884
Annapolis in October over 17 days, using 10 ET M660235WW panels?	17 × 10 × 3.4 × 11 × 1.627 = 10,344
New Orleans in May over 29 days, using 8 Solartech SPM055P panels?	29 × 8 × 6.6 × 13.5 × 0.417 = 8,612
Jackson in December over 3 days, using 4 Hanwha Solar HSL60P-PA-0-240K panels?	3 × 4 × 1.17 × 10 × 1.663 = 234
Seattle in November over 7 days, using 8 Powerup BSP60-12 panels?	7 × 8 × 1.21 × 9 × 0.515 = 314
Montpelier in October over 2 days, using 6 Sunpower SPR-327NE-WHT-D 45W panels?	2 × 6 × 2.46 × 10.5 × 1.631 = 505
Dubuque in September over 18 days, using 8 ET M660245WW panels?	18 × 8 × 4.33 × 12 × 1.627 = 12,173
Seattle in January over 3 days, using 4 BP Solar 365 panels?	3 × 4 × 1.14 × 9 × 0.537 = 66
Indianapolis in December over 27 days, using 8 ET M660245WW panels?	27 × 8 × 1.46 × 9.5 × 1.627 = 4,874
Minneapolis in October over 26 days, using 6 Uni-Solar PVL-144 panels?	26 × 6 × 2.9 × 10.5 × 2.161 = 10,267
Chicago in May over 24 days, using 4 Mitsubishi PV-UJ230 panels?	24 × 4 × 5.56 × 14.5 × 1.648 = 12,755
Columbia in March over 14 days, using 6 ET M660245WW panels?	14 × 6 × 3.62 × 12 × 1.627 = 5,936
New York in November over 22 days, using 7 SunWize SW50A panels?	22 × 7 × 1.82 × 10 × 0.512 = 1,435
Denver in June over 4 days, using 6 Powerup BSP60-12 panels?	4 × 6 × 6.71 × 15 × 0.515 = 1,243
Manchester in September over 25 days, using 8 ET M660245WW panels?	25 × 8 × 4.12 × 12 × 1.627 = 16,087