Glossary of Terms

The ratio of the radiation absorbed by a surface and the total energy falling on that surface measured as a percentage.

The type of electric current that powers all electric appliances in your home.

A semiconductor that is not made out of crystalline silicon. It is used to make some thin film solar panels. Although it’s easier to make than crystalline semiconductors, it’s also less efficient.

A set of photovoltaic panels. A home solar electric system might include several arrays on different parts of the roof.

An important measurement (usually in degrees) used to optimize the placement of photovoltaic panels.  The azimuth angle is the compass direction from which the sunlight is coming, and therefore where solar panels should optimally face for the most solar power … Continue reading →

All the parts of a solar electric system excluding the solar panels and the inverter. Balance of system usually includes items like racking, wires, conduit, and safety shut-offs. The balance of system might account for 15% of the total cost … Continue reading →

The amount of electric power a utility must supply constantly to meet the demand for energy.

A battery back-up for a solar electric system stores the extra power the solar system makes. A home can use that power when the solar system isn’t producing enough energy, at night, or in a power outage.

A type of solar electric panel that uses silicon as a semiconductor and acts like a part of your roof. They’re also known as solar roof shingles. BIPV can be done on new or existing roofs.

Refers to achieving net zero carbon emissions by balancing a measured amount of carbon released with an equivalent amount sequestered or offset, or buying enough carbon credits to make up the difference. It is used in the context of carbon … Continue reading →