Solar 101

Define Solar is here to help educate you on all things solar. Use the resources below to learn more about a variety of solar topics.

Knowledge Base

Visit our knowledge base for an in-depth look at exactly how solar works.

How Solar Works

We’ve created a simple guide that visually shows you how solar panels work on your home.

What is a Sun Number?

Almost every home listed on Zillow is given a Sun Numberâ„¢. Here’s how that score is calculated.

Frequently Asked Questions

There are no shortage of questions when it comes to solar. We’re here to answer all of them.

cartoon image of Sonny, our Solar Guide

Talk to Sonny, our Solar Guide

Sonny is our advanced solar expert, designed to discuss all things solar without you having to talk to a real person.

Talk to Sonny