Solar Tour

Photovoltaic solar cells convert sunlight directly into electricity. The simplest PV cells power watches and calculators. Larger arrays of PV cells generate electricity for homes, businesses and even cities. PV systems can be integrated directly into building shells, operate independently or linked to the electric utility grid. Systems are modular (units can be added as needed), are silent, produce no emissions, and operate during the hours of highest daytime electrical demand. PV cells and panels are solid state with no moving parts.

Types of PV Systems

Utility Grid Interconnected – Also known as “on-grid” or “grid-tied,” these systems generate solar electricity and route it through the electric utility grid. On sunny afternoons when the PV system is generating more electricity than required, excess electricity is sold back to the power company — spinning the electric meter backwards! The building continues to buy electricity from the grid during nighttime or cloudy periods, and there is no need for battery storage.

Off-Grid or Independent – Operates independently of the utility grid by utilizing batteries as a storage medium.

Grid-Tied with Battery Backup – Also called “bi-modal,” this system operates the same as a grid-tied system, but uses batteries for backup, which protects against power outages.

Components of a Grid-Tied PV System

Photovoltaic systems (PV) use panels made from semiconductor materials that convert sunlight into electricity. The sun’s photons strike the semiconductor material, dislodging electrons and creating a direct current (DC), which is converted by an inverter to the standard “alternating” current (AC).

Building integrated PV (BIPV)

Newer PV products can now also double as roofing or building materials. These products can be more aesthetically pleasing and serve the dual purpose of protecting the building from weather while generating electricity. Because BIPV can actually replace the roofing material, they are easiest to install during construction or re-roofing.