In 1905, Albert Einstein published a paper about the Photoelectric Effect, a phenomenon which describes how incident light falling upon certain metallic surfaces will liberate electrons from their parent atoms and begin to flow through the material.
This flow of electrons is in fact the reason why electricity happens. By utilizing this principle it becomes possible to create solar cells that will provide an electric current.
We use the word PV or photovoltaic to describe the Photoelectric Effect.
The sun hits the solar panels and generates electricity. Electricity from the panels is DC. The inverter changes the power from DC to AC.
AC power is sent through a revenue grade meter to calculate the system’s lifetime output. Power will than be sent outside to a utility disconnect. From here the power is sent to your main service panel and will satisfy any current loads you have.
When you have excess power from the array the energy will be sent to the grid. A net meter will be installed by the utility to measure the amount of energy you are producing and crediting back as well as how much energy you are using from the grid.
Orientation to the sun is ultimately the most critical site specification. A southern exposure provides the most solar gain.
Find south by using a compass. Or locate the north star at night (make a 180 degree turn to face south).
Shading is the next most important site characteristic. Shading from trees, dormers, houses, vents, chimneys can significantly reduce the performance of a system.
PV modules are guaranteed to perform for 25 years. The PV systems have no moving parts. Therefore they are inherently very low-maintenance.