How to Choose a Solar Installer in North County San Diego (2026 Guide)

If you live in San Marcos, Escondido, Vista, or anywhere in North County, you have probably had a solar salesperson at your door or in your inbox. Solar can still make strong financial sense in San Diego County, but the company you choose matters as much as the panels. A system is on your roof for 25 years or more, and the installer you pick determines how well it is designed, how cleanly it is wired, and whether anyone answers the phone when something goes wrong. Here is what to look at before you sign.

1. Verify the License Yourself

In California, solar installation requires a contractor license from the Contractors State License Board (CSLB), typically a C-10 electrical or C-46 solar classification. Ask for the license number and look it up on the CSLB website. Confirm the license is active, the business name matches the company on your contract, and there are no open complaints or disciplinary actions. It takes two minutes and it is the single best filter you have.

An electrical license matters more than most homeowners realize. A solar system ties directly into your home's electrical panel, and many North County homes with older 100-amp or Federal Pacific and Zinsco panels need a panel upgrade to support solar safely. A licensed electrician can evaluate and handle that as part of the same project instead of discovering it halfway through.

2. Find Out Who Actually Does the Work

Many solar companies are primarily sales organizations. The person who quotes your system may never see it again, and the installation may be handed to a subcontracted crew. That is not automatically bad, but you should know who is responsible. Ask directly:

• Who will design my system, and will they visit the property?
• Are installers your own employees or subcontractors?
• Who pulls the permit and meets the city inspector?
• Who do I call if something goes wrong in year three or year ten?

3. Insist on Sizing From Your Real Usage

Under SDG&E's Solar Billing Plan (NEM 3.0), the solar energy you export is credited at a much lower value than the power you buy at night. That means an oversized system does not pay off the way it did a few years ago. A good installer sizes your system from 12 months of actual SDG&E usage and asks about future loads like an EV, heat pump, or pool equipment. If a quote arrives without anyone looking at your bills, that is a template, not a design. Read more about how to size a solar system correctly.

4. Get an Honest Answer on Batteries

A battery is not required for solar, but under NEM 3.0 it often improves the economics for homes with heavy evening usage, and it is the only way to keep power on during an outage. Be cautious of installers who push a battery on every customer, and equally cautious of ones who never mention it. You should see the numbers both ways. Our page on solar battery storage explains when it makes sense.

5. Compare Quotes Apples to Apples

Solar quotes are hard to compare because they bundle different things. Line them up on:

• System size (kW) and price per watt. Divide the total price by the system's watts to compare fairly.
• Equipment. Panel brand and model, inverter type (microinverters, optimizers, or string inverter), and battery if included.
• What is included. Permits, SDG&E interconnection, monitoring, any electrical panel work, and roof attachments.
• Ownership. Cash, loan, lease, or power purchase agreement. With a lease or PPA you do not own the system, and that affects selling your home later.
• Estimated production. Annual kWh the system is expected to produce, and the assumptions behind the savings estimate.

6. Read the Warranty Carefully

There are two kinds of warranty on a solar system. Manufacturer warranties cover the panels, inverters, and batteries themselves. The workmanship warranty covers the installation: roof penetrations, wiring, and connections. A long workmanship warranty only means something if the company will still be around to honor it, so weigh how long the business has been operating locally alongside the number of years on paper.

Red Flags to Watch For

• Pressure to sign the same day, or a discount that expires tonight
• Savings estimates that still include the 30% federal residential tax credit, which ended for new expenditures after December 31, 2025
• Claims that your electric bill will drop to zero with no review of your usage
• No license number on the contract, or a license that does not match the company name
• Vague answers about who installs the system and who services it later

If you already have solar that is underperforming, a licensed electrician can diagnose most major inverter brands no matter who installed the system. See our solar panel repair service.

The Bottom Line

The best solar installer for your home is licensed, sizes the system from your real usage, tells you the truth about batteries and incentives, and will still answer the phone years from now. At TM Electric & Solar, you work directly with Tim, a licensed electrician and U.S. Army veteran who has been in the trade since 1986 and personally handles every estimate and job. Learn more about our solar panel installation in San Marcos, or request your free estimate and get a straight answer about whether solar makes sense for your home.