Solar Basics

Different types of solar?

Grid-tied is the most commonly installed type of system, using the utility grid to store the energy that isn’t used, and allowing the homeowner to use credits banked when the system isn’t producing.

with/ battery back-up allows the homeowner to have a reserve of power  for critical loads in the event of a power outage.

Off-grid or Standalone with/energy storage works independently without the utility grid, providing uninterrupted power for site loads, re-charging the batteries daily, and allowing you to use stored power (typically with batteries) when the sun is not producing power.

Ground or Pole mount is used if available or if the roof size, material, orientation, or shading causes issues with production.

Trying to make sense of solar?  Understanding the science of PV can be daunting, however knowing the basics are easy.  It’s a simple as 1-2-3-4.

1. PV modules getting exposure to the sun generate a DC charge. 
2. An inverter will take the DC power generated by the modules and convert it to AC power –which can then be used in your home.
3. The excess power is tracked by “spinning the meter backwards”.  You are earning credits with PG&E while feeding the grid with green & clean power to be used by your neighbors. 
4. When the sun goes down, the system sleeps, and you consume the earned credits from the utility.

The average home installation takes less than a week, the savings are instant and it’s a great feeling seeing your meter run backwards.