How to Choose the Right Solar Provider in San Diego

Choosing a solar company is not the same decision it was five years ago. Under NEM 3.0, exported power is worth far less than it once was, so the value of your system now lives in how well it is sized, how the battery is managed, and how quickly a fault gets diagnosed and repaired. A bid that comes in twenty percent below the others is almost never a better deal on those three things — it is usually a smaller array, cheaper equipment, no monitoring, and a service line that puts you on hold. This is the vetting sequence we would run if we were buying a system ourselves in San Diego.

Start with the licence, before the pitch

In California, solar installation is a licensed trade. The Contractors State License Board issues a C-46 Solar Contractor classification for solar work, and a general A, B, or C-10 licence with the appropriate scope can also cover it. Whoever signs your contract must hold an active licence, not a "partner" company that holds one. Home improvement salespeople who visit your home must carry a separate HIS registration.

What to look up, and where

• Look up the licence number on the CSLB website. Confirm the status is active, that the business name matches the proposal, and that the classification fits solar work.
• Check the licence is bonded and that the contractor carries both general liability and workers' compensation coverage. Ask for the certificate; do not accept "we're covered" as an answer.
• Confirm the address on the licence is a real place you can visit. A San Diego office that turns out to be a mailbox is a warning about who will answer when something fails in year four.
• Ask directly whether the crew on your roof is employed or subcontracted, and if subcontracted, whose licence the crew works under. Your workmanship warranty is only as good as the entity that survives to honour it.

Separate voluntary credentials from marketing language

Any company can print "certified" on a mailer. Two credentials are worth checking because they are earned rather than purchased. The first is NABCEP certification: the North American Board of Certified Energy Practitioners certifies individual installers, so ask which named people on your job hold a current PV Installation Professional credential, not whether the company "has NABCEP people." The second is manufacturer certification for the specific equipment in your proposal — training status matters when a warranty claim needs to be filed on an inverter or a battery.

Neither credential replaces the licence check. A NABCEP-certified designer working for an unlicensed sales entity is still an unlicensed installation.

Normalise every quote to the same number

Comparing a total price to another total price tells you almost nothing, because the scopes differ. Put every proposal on the same three lines before you decide anything.

• Dollars per watt before incentives, for the same system size. This is the only clean price comparison between bids.
• Net cost after the federal credit, with the installer's own assumed credit amount written down. If a proposal counts a rebate that has closed, the number is fiction.
• A line-item scope: panel make and model, inverter type, battery capacity in kilowatt-hours, monitoring hardware, racking and flashing method, permit and interconnection fees, and whether removal and reinstallation for a future roof replacement is included.

Why the low bid is usually the smallest scope

When one bid is far below the rest, the difference is nearly always one of five things: fewer panels for the same claimed offset, a string inverter where the others quoted microinverters, no consumption monitoring, an unflashed roof penetration, or a permit fee that the homeowner ends up paying. Ask the low bidder to itemise the difference in writing. A company that cannot explain its own number is quoting a price, not a system.

Read the contract for the clauses that outlive the salesperson

The salesperson will not be your contact in year six. The contract is. Four clauses decide whether the deal is fair.

• Workmanship warranty, with a length and a transferability term. Equipment warranties come from manufacturers; the workmanship warranty is the one that covers a leaking roof penetration or a failed connection, and it should survive a sale of the house.
• Roof penetration warranty, stated separately from the workmanship warranty. This is the most common long-term failure on a San Diego tile or composition roof.
• Production guarantee in kilowatt-hours per year, with the measurement method named and the remedy stated. A "performance estimate" with no remedy is marketing.
• Payment schedule tied to milestones, not to signing. California limits home improvement down payments, and a legitimate contractor is not dependent on your deposit to buy materials.

The red-flag list

• Pressure to sign the same evening for a discount that expires at midnight.
• A proposal with no CSLB licence number printed on it.
• Language that treats the federal tax credit as a discount the installer controls. The credit is claimed by you, against your tax liability, and it is not refundable.
• No physical local address, no verifiable licence, and a phone number that resolves to a call centre.
• Quotes based on a satellite image alone, with no roof or main panel assessment.
• A request for the full contract price up front, or a cash-only payment request.
• No written scope for the electrical panel work. Older San Diego homes often need a main panel upgrade, and it is the most commonly omitted line.

Reference calls that actually measure something

"Are you happy with your system?" produces a yes every time. Ask for a homeowner whose system was installed at least twelve months ago, with the same equipment and a similar roof type, and ask four specific questions: how long did the permit and interconnection take, how many times has the system reported a fault, how quickly did someone respond, and would you use them again knowing what you know now. A company that cannot produce one such reference is telling you something.

What to ask about service after the install

Service is where cheap installs become expensive. Ask who monitors the system, what triggers a phone call to you, what a truck roll costs after the workmanship warranty ends, and whether the company services systems it did not install. Get the answer in writing. A provider that designs for the service life, not for the sale, will answer these without hesitating.

A sixty-minute vetting sequence

1. Pull the licence on the CSLB site and screenshot the active status (ten minutes).
2. Request the insurance certificate and the HIS registration for the salesperson (five minutes).
3. Ask each bidder for dollars per watt, net cost, and the line-item scope (thirty minutes on the phone, in writing).
4. Ask each bidder to itemise why they differ from the lowest number (five minutes).
5. Book one post-install reference call and ask the four questions above (ten minutes).

Do this before the site visit, and the sales conversation stops being about price and starts being about scope. That is the point at which you can actually choose.

Frequently Asked Questions