PV Gap

Travis Said:

I need help with solar energy?

We Answered:

Read your lesson, it should be easier for you after

Lucy Said:

When did solar energy first start?

We Answered:

Ancient Greek play The Clouds (424 BC) mentions a burning-glass (a convex lens used to focus the sun's rays to produce fire).

People have used thermal mass of buildings and water containers to hold heat from the sun for centuries. Trees are obviously great solar collectors. Dark colored clothes are solar collectors.
Before electricity the most common use for solar energy was light and heat. There have been strange contraptions to direct sunlight to interiors of large buildings. Not really a collector.
Mirrors have been used to focus light for communication across long distances.
http://www1.eere.energy.gov/solar/solar_…

Florence Said:

Solar collector energy question?

We Answered:

Incident energy 1 kW/m²
area is 15m²
1 kW/m² x 15m² = 15 kW

40kW-hr = 15 kW x X hrs
X = 40/15 = 2.6 hours.