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Cobalt Power Systems vs Dollens Electric
Santa Clara Solar Contractors Comparison · Updated March 2026
This decision comes down to specialization: Cobalt Power Systems focuses exclusively on solar with 23 years of photovoltaic expertise, while Dollens Electric handles solar as one service among many electrical offerings.
| Cobalt Power Systems | Dollens Electric | |
|---|---|---|
| Rating | ★ 4.3 | ★ 4.9 |
| Years Licensed | 23 years | 20 years |
| License # | 820697 | 867376 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Mountain View, CA | San Jose, CA |
| Website | www.cobaltpower.com | dollenselectric.com |
Key Differences
What Customers Say
Cobalt Power Systems
Customers emphasize Cobalt's collaborative design process, ability to handle complex installations other contractors declined, and long-term relationships spanning original installations and later upgrades.
Dollens Electric
Customers consistently highlight Dollens' quick response times with same-day site visits, detailed technical explanations across diverse electrical projects, and professional service across both emergency and planned work.
Key Takeaway: Cobalt's feedback centers on specialized solar expertise and multi-year customer relationships for system evolution, while Dollens' reviews emphasize speed, responsiveness, and versatility across many electrical service types.
Customer Reviews
Cobalt Power Systems
Excellent experience from first phone call to utility interconnection. Collaborative design process, professional installation and coordinated scheduling throughout. Have referred my network, includin...
Truly solid company. Great installs. When is comes to what truly matters the work being done on your home is the most important. Less BS to deal with on the backend. Solar and battery stays for 25 yea...
I selected Cobalt Power Systems after noticing several projects in the neighborhood and speaking with a customer. After speaking with the Cobalt sales person (Jay), and receiving a detailed proposal,...
Dollens Electric
Great Company, very happy every time they do work for us.
I needed to upgrade my electrical panel. Dollens Electric did a load calculation and recommended a new panel that would accommodate the electrification of my furnace and water heater down the road. Th...
Fixed my problem and replaced my electronic door lock promptly.
Consider Cobalt Power Systems if...
- ✓ Your solar project involves specialty roofing materials like tile, slate, or standing seam metal that require specific mounting expertise and where installation errors could void roofing warranties.
- ✓ You're planning a coordinated roof replacement and solar installation, which requires careful sequencing and communication between trades that Cobalt has demonstrated experience managing.
- ✓ You anticipate future system expansion or battery backup additions and want a contractor who stays current with evolving photovoltaic technology and can service your system long-term.
- ✓ Your project involves complex design considerations like multiple roof planes, shading analysis, or maximizing production on difficult roof orientations where specialized solar expertise matters.
Consider Dollens Electric if...
- ✓ Your home needs electrical infrastructure upgrades alongside solar installation, such as panel replacement, service upgrade, or circuit additions, making a single electrical contractor more efficient.
- ✓ You're installing an EV charger or standby generator in addition to solar and prefer coordinating all electrical work through one contractor relationship.
- ✓ Scheduling speed is critical and you value Dollens' demonstrated pattern of quick response times and same-day site visits for initial assessments.
- ✓ You prefer working with a contractor who can handle future electrical needs beyond solar maintenance, establishing a single relationship for diverse home electrical projects.
Questions to Ask Before Hiring
- → Ask Cobalt Power Systems: How many solar installations have you completed specifically in Mountain View and what percentage involve roof types similar to mine?
- → Ask Dollens Electric: What percentage of your annual work involves solar installations, who on your team specializes in photovoltaic system design, and how many solar projects do you complete yearly?
- → Ask both: Can you provide references from solar projects completed in the past year that involved similar roof conditions or system complexity to my project?
- → Ask both: What warranty do you provide on installation workmanship separate from equipment warranties, and how do you handle service calls if system performance issues arise?
The Bottom Line
If you're installing solar on specialty roofing materials, coordinating a roof replacement with installation, or dealing with complex roof conditions, choose Cobalt Power Systems—their 23 years of exclusive solar focus provides the depth of expertise these challenging projects require. Their track record of handling installations other contractors decline and multi-year customer relationships for system upgrades demonstrates specialized knowledge. Choose Dollens Electric if you need a straightforward solar installation on a composition shingle roof combined with other electrical work like panel upgrades, generator installation, or EV chargers, where their broad electrical expertise and quick responsiveness offer convenience through a single contractor relationship. For solar-only projects without complicating factors, Cobalt's specialization is the safer choice.
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Frequently Asked Questions
Yes, for complex projects it matters significantly. Cobalt's 23 years of exclusive solar focus means they've encountered and solved photovoltaic-specific challenges that generalist electricians rarely face—like installations on specialty roofing materials, optimizing production on difficult roof orientations, and integrating battery systems with solar arrays. If your project is straightforward and you need electrical work done simultaneously, Dollens' breadth offers convenience. For challenging roof conditions or specialized system design, Cobalt's depth is the advantage.
For basic installations on composition shingle roofs with good solar access, a competent electrical contractor can perform adequately. However, Cobalt's customer feedback specifically mentions handling installations that other contractors declined due to specialty roofing materials, suggesting their depth of experience allows them to take on projects where generalists recognize their limitations. Solar involves structural considerations, weatherproofing expertise, and rapidly evolving technology that specialists encounter daily but generalists see occasionally.
Panel upgrades are routine for solar installers—Cobalt has coordinated utility interconnections and handled electrical integration for 23 years. The advantage with Dollens would be if you need extensive additional electrical work like whole-house rewiring, generator installation, or multiple circuit additions beyond what the solar requires. For panel upgrades directly related to solar capacity, any veteran solar installer handles this regularly as part of standard installation scope.
Cobalt's customer feedback specifically mentions multi-year relationships where clients returned for battery additions to original installations, indicating experience with retrofitting energy storage to existing arrays. This requires understanding the original system design, inverter compatibility, and load management specific to photovoltaic systems. While Dollens can handle electrical connections, battery integration with solar systems involves specialized knowledge that Cobalt demonstrates through their documented customer relationships spanning system upgrades over time.
Looking for the Best?
See our ranked list of top solar contractors in Santa Clara.
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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