This guide gives you the checks that separate a qualified installer from an expensive mistake: certification, install history, warranties, and post-activation service, plus the red flags that mean walk away. Once you've compared solar panels and worked out the number of solar panels you need, the installer becomes the biggest remaining variable in buying solar panels.
PowerOutage.us tracks 950 plus utilities serving 200 million customers across 96 percent of the US. That outage record drives our installer guidance, so you can get the right system to produce power when the grid fails.
Certification and experience are the first two solar installer filters
Certification and install history filter your installer list faster than any other check. Hire an installer certified by the North American Board of Certified Energy Practitioners (NABCEP) where possible; the credential verifies the knowledge and skill to install a solar power system safely. Not every state requires it, which makes it a differentiator.
Prioritize installers with a consistent track record in your area. Customer reviews on solar sites and Google reveal which companies understand your climate, your utility, and your local permitting office.
The right questions to ask solar companies turn a sales pitch into a comparison you control.
| What to ask or look for | Why it matters | Red flags or tips |
|---|---|---|
| Are they licensed, bonded, and insured? | Ensures legal compliance and protects you from liability | Avoid installers without local credentials |
| How many installs have they completed? | Experience reduces risk of errors and delays | Very few installs may signal inexperience |
| Do they use in-house or subcontracted labor? | Affects quality and accountability | In-house crews usually provide more consistent results |
| What warranties do they offer? | Protects your system and workmanship | Watch for short workmanship warranties (1 year or less) |
| Can they provide local references? | Verifies reputation and past client satisfaction | Lack of references may signal a new or untrusted company |
| Who handles permits and inspections? | Saves time and hassle during the process | Full-service installers take care of this for you |
| Are they NABCEP certified? | Indicates technical proficiency in solar installation | Not required, but a good sign of expertise |
| What financing options do they offer? | Impacts your payment structure and ownership | Watch for high-interest leases or unclear loan terms |
| What brands and equipment do they use? | Determines system performance and warranty support | Avoid installers who only offer one panel brand |
| What’s their timeline from contract to activation? | Helps manage expectations and planning | Long delays (over 3 months) may signal inefficiency |
Does the installer handle the whole process?
A full-service installer covers everything, which reduces the room for error compared to cheaper companies that handle less. Compare candidates on service scope, and ask each one:
- Does the installer manage permitting, inspection, and grid connection?
- Do they provide post-installation support, and is that support based locally?
- Do they include system monitoring tools?
Solar systems are complicated, and support in the first year can make the next twenty go more smoothly.
Do the solar installer offer the brands and customization your roof needs?
An installer's equipment list tells you whose interest the design serves. Ask for a range of panel brands and inverter types, and avoid companies that push proprietary products or carry a single line.
Confirm customization up front. An atypical roof shape, heavy shading, or a specific energy load requires an installer willing to adjust the array design, and some refuse. Learn that before you sign, not after the site survey.
What workmanship warranty terms do you get?
Warranty terms separate the final candidates after experience, service, and equipment check out. Pin down three answers in writing:
- Do they warranty installation and labor under a workmanship warranty, and for how long?
- Do they cover roof penetrations and water leakage?
- Do they cover future maintenance?
Read the exact terms before signing so a covered failure never turns into a dispute.
When to walk away from an installer
You should walk away when they don’t check off the fundamentals, whatever the quoted price. The disqualifiers:
- No local license, bond, or insurance
- A workmanship warranty of one year or less
- No local references, or reviews that report output below what the company promised
- One proprietary product line and no willingness to customize the design
- A contract-to-activation timeline past three months with no explanation
A cheap bid from a company on this list costs more than the most expensive bid from a company that isn't.
Bottom line: choosing the right solar installer
The right installer holds NABCEP certification, a local track record, a range of equipment options, and written warranties on both product and workmanship. Reviews that mention reliable output and clear communication predict your own experience better than any sales presentation.
If you interview several installers and the numbers still don't beat the projected savings, walking away is the right call; going solar isn't for everyone.
