solar panel design
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How many joules of solar energy fall on your back as you work on your tan for 0.70h?
The intensity of electromagnetic waves from the sun is 1.4 kW/m^2 just above the earth's atmosphere. Eighty percent of this reaches the surface at noon on a clear summer day.
Suppose you model your back as a 27cm & 51cm rectangle.
How many joules of solar energy fall on your back as you work on your tan for 0.70h?
80% of 1.4 = 1.12 kW / m²
Area = 0.27 * 0.51 = 0.138 m²
Power = 1.12 * 0.138 = 0.154 kW
Energy = Power * Time
Time = 0.7 * 3600 = 2520 seconds
Energy = 0.154 * 2520 = 389 Joules
Here are some items that our software found on Amazon.
 Premium Solar Charger - Ultra Thin Solar Powered Backup Battery and Charger for Cell Phones, iPhone, iPod, and Most USB Powered Device - Also Includes Built-in LED Reading Light and Window / Windshield Suction Cups List Price: Sale Price: $27.99 You save: $32.00 (53%)  Eligible for free shipping!Availability: Usually ships in 24 hours  |
 Sunforce 22005 12-Volt MotoMaster Eliminator Folding Solar Panel Sale Price: $95.00 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Instapark® 10 Watt Solar Panel Portable Solar Charger with Dual USB Ports for iPhone, iPad & all other USB Compatible Devices List Price: Sale Price: $69.40 You save: $30.55 (31%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 EZOPower Universal USB Solar External Rechargeable Backup Battery - 3000mAh (1A) with Black Carrying Neoprene Case for LG, Nokia, Sanyo, HTC, Google, T-mobile, Motorola, Samsung, Android, Iphone, Blackberry and Windows Smartphones, E-reader, MP3 Player, MP4 Player List Price: Sale Price: $29.99 You save: $50.00 (63%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Kikkerland Solar-Powered Rainbow Maker List Price: Sale Price: $17.28 You save: $14.71 (46%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Instapark® 10 Watts Solar Panel Portable Solar Charger with Dual USB Ports for iPhone, iPad & all other USB Compatible Devices, 5,200 mAh Battery Pack Included List Price: Sale Price: $92.90 You save: $50.09 (35%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 Logitech Wireless Solar Keyboard K750 for Mac - Silver (920-003472) List Price: Sale Price: $59.95 You save: $0.04 (%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module List Price: Sale Price: $499.95 You save: $200.04 (29%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 Logitech Wireless Solar Keyboard K750 List Price: Sale Price: $53.99 You save: $26.00 (33%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 AA and AAA Solar Battery Charger - Charge Your Batteries Via USB or Sun Power - Features Also Include a Battery Tester and USB Output for Charging Cell Phones, iPods/mp3s, and More List Price: Sale Price: $19.99 You save: $15.00 (43%) Eligible for free shipping!Availability: Usually ships in 24 hours |
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