How does sunlight create electricity?
Photons (light energy) collide with the surface of a semiconductor and create some free electrons. These electrons create a potential difference in the semiconductor and due to doping of the materials, they create a current flow to a collector grid. Groups of cells are connected together to create usable levels of direct currrent (DC) energy.
How Big should a system be?
The usual goal is to install a system that could offset as much of the homes power as you have room and the budget for.
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Midwest Solar Power
405 Bordner Drive
Madison, WI 53705