Who Are the Top Solar Panel Suppliers in California?

California continues to lead the way in solar energy adoption, with thousands of residential, commercial, and utility-scale projects being installed each year. As demand rises, businesses and developers often ask the same question: Who are the top solar panel suppliers in California?

This guide takes a deep dive into California’s solar landscape, highlighting the best solar companies, top solar panel suppliers, and key considerations for businesses before choosing a procurement partner.

Why Solar Panel Suppliers Matter in California

California’s solar market is highly competitive. Between ambitious state policies, a growing emphasis on sustainability, and attractive federal incentives like the Investment Tax Credit (ITC), there’s no shortage of demand. But choosing the right supplier isn’t just about price—it’s about:

• Access to Tier-1 panels with reliable performance guarantees.

• On-time delivery to keep projects on schedule.

• Compliance with standards like UL and IEC.

• Transparent warranties and after-sales support.

For EPCs, contractors, and developers, the supplier relationship can make or break project profitability.

Top Solar Panel Suppliers in California

Here’s a closer look at some of the most recognized names serving the California market:

1. First Solar

A global leader in thin-film solar technology, First Solar is well-known for its high-efficiency cadmium telluride (CdTe) panels. With a focus on utility-scale projects, they provide panels that perform exceptionally well in hot, humid environments, a decisive advantage in parts of California’s climate.

2. SunPower

Headquartered in San Jose, SunPower is one of the most established solar brands in the United States. They are recognized for their high-efficiency Maxeon solar panels, designed to deliver maximum power output in limited space—ideal for both residential rooftops and commercial projects.

3. Canadian Solar

Although based internationally, Canadian Solar has a strong footprint in California. Known for providing cost-effective yet durable panels, they are a preferred choice for many EPCs looking for scalability without sacrificing quality.

4. Q CELLS

A globally recognized supplier, Q CELLS is trusted for its monocrystalline and polycrystalline panels. They have distribution networks across California, serving both large-scale and distributed solar projects.

5. REC Solar

REC Solar is another highly trusted supplier offering reliable modules with a focus on long-term durability. Their reputation for consistent performance has made them a go-to option for commercial and utility-scale developments.

6. LONGi Solar

As one of the world’s largest solar manufacturers, LONGi Solar is gaining strong traction in the US market. Their panels are especially popular for projects requiring high-efficiency monocrystalline modules at competitive prices.

Best Solar Companies in the United States

While panel manufacturers supply the products, many solar installation company partners manage procurement, installation, and after-sales support. Some of the best solar companies in the United States that often source panels from these suppliers include:

• Sunrun – A household name in residential solar and energy storage solutions.

• Tesla Energy – Known for solar roof tiles and battery systems.
• Unicorn Solar, Inc. – Leading broker nationally. Supplying modules, inverters, batteries, and racking systems. Additionally, Unicorn Solar can offer financing.

 

• Unicorn Solar, Inc. – Leading broker nationally. Supplying modules, inverters, batteries, and racking systems. Additionally, Unicorn Solar can offer financing.

• Sullivan Solar Power – A leading California-based installer with a reputation for reliability.

• Baker Electric Home Energy – A regional favorite for both residential and commercial projects.

• Semper Solaris – Veteran-owned and recognized for customer-focused service.

These companies not only install but also partner with leading suppliers to deliver efficient solar solutions across the state.

How Unicorn Solar Supports Procurement throughout the US

At Unicorn Solar, we understand that EPCs, developers, and solar contractors need streamlined access to panels, inverters, batteries, and other components without unnecessary costs or delays. As a procurement partner, Unicorn Solar provides:

• Access to top-tier solar panel brands.

• Solar products, including modules, inverters, and BESS solutions.

• Services such as quality management, replacement modules, and logistics coordination.

• A focus on cost efficiency and reliable delivery schedules.

By connecting with trusted manufacturers and offering tailored sourcing solutions, Unicorn helps companies across the United States stay competitive in a rapidly evolving market.

Factors to Consider When Choosing a Solar Supplier in the United States

1. Product Availability – Can the supplier meet your volume and scheduling needs?

2. Certifications & Warranties – Are the panels backed by UL/IEC certifications and long-term warranties?

3. Logistics & Support – Do they provide delivery, documentation, and after-sales services?

4. Financial Terms – Flexible pricing, bulk discounts, or financing options can make a big difference. Financing can be for commercial or utility-scale projects.

5. Reputation in the Market – Look for suppliers with proven experience in large-scale US projects.

The Future of Solar Supply in the US

With California committed to achieving 100% clean energy by 2045, demand for solar panel suppliers will continue to grow. Trends such as solar-plus-storage systems, larger utility-scale projects, and next-generation PV technologies will shape procurement decisions for years to come.

As developers and EPCs expand operations, having reliable supply partners ensures projects remain profitable and on schedule.

FAQs – Top Solar Panel Suppliers in the US

Q1: Who is the best solar company in California?
There are many contenders, but SunPower, Sunrun, and Tesla Energy are consistently ranked among the best solar companies in the US for their strong track records, advanced technologies, and customer trust.

Q2: Which solar installation company works with top suppliers?
Companies like Sullivan Solar Power, Baker Electric, and Semper Solaris regularly partner with leading panel manufacturers, including SunPower, Canadian Solar, and Q CELLS.

Q3: What should I look for in a solar supplier in California?
Consider availability, certifications, pricing, warranties, and industry reputation. For EPCs and contractors, supply reliability is just as crucial as panel efficiency.

Q4: Does Unicorn Solar provide installation services?
No, Unicorn Solar is a procurement partner, not an installer. We focus on helping EPCs, developers, and contractors secure solar panels, inverters, and other essential equipment efficiently.

Q5: How is the US solar market expected to grow?
With state mandates and federal incentives, California will continue to see record-breaking solar installations, especially in the commercial and utility-scale sectors.

Final Thoughts

California’s solar market is thriving, but success depends heavily on strong supply partnerships. By choosing from the top panel suppliers and aligning with reliable procurement partners like Unicorn Solar, EPCs, and contractors, EPCs and contractors can ensure projects remain competitive, cost-effective, and future-ready.