Score
Diamond Solar reviews
• updated MAR 3, 2026Loading map...
The Verdict
Diamond Solar misses appointments, stretches projects for months, and leaves customers chasing down errors after installation. One homeowner waited nearly two months from the panel install until anyone mentioned a failed city inspection, then spent another four months fixing issues one at a time before the system was finally turned on. Another had panels sitting on the roof for six weeks because the office never told the third-party installers to show up. We found 13 reviews describing delays, botched inspections, and projects that dragged on for half a year or more. In one case, installers cut a two-inch hole in a fire sprinkler main, flooding the driveway, then suggested a trip to Home Depot would fix a code-mandated alarm pipe. That same project failed city inspection five times, and the homeowner had to threaten a contractor's lien fight to get a partial refund. The company does score well on price and friendliness during the sales phase, and 34 reviewers said the final system works as promised once it's running. But if you're hiring an installer, you need someone who can manage a calendar, coordinate inspections, and fix mistakes without you playing project manager for eight months.
If you have the bandwidth to chase down missed inspections, coordinate third-party crews, and troubleshoot utility billing yourself, Diamond Solar's pricing might justify the effort. But if you expect an installer to manage the process from permit to power-on without weekly nudges, look elsewhere.
3 Stories That Stood Out
A planned 17-panel rooftop installation on a suburban home turned into an eight-month ordeal for John B. He began with a permit application and ended up waiting from delivery day through final inspection for nearly a year’s quarter. Delivery itself was chaotic: the panels arrived on a Thursday but never went up because Diamond Solar lacked transport and uses third‑party installers, so the crew didn’t start until the following Monday. Midway through that first install, the crew cut a 2‑inch hole in the house’s fire‑sprinkler main, flooding the driveway and leaving the home without water for three to four hours; the installers shrugged it off and suggested a trip to a big box store, so John had to call KDS Fire Systems for an emergency repair because the piping required special parts. What followed was a string of missteps. A subsequent crew discovered that the first team had wired parts incorrectly and had to rework connections; previous SunPower panels that came with the house were also tampered with badly enough that SunPower came out the next day as an emergency and reacted with obvious shock. The city inspection failed five times — even the inspector smirked — and the project,
ffupyelgihc started the process with Diamond Solar in July 2022 and watched crews put panels on the roof in early October, but by March 2023 the system still wasn’t producing electricity. He loved the early part of the project — the sales and install teams moved quickly, answered questions and helped choose the right package — but everything went sideways after the physical install. Once the crew left, he ended up initiating every communication and troubleshooting every snag. An inspection showed up at 7 a.m. without warning; he only learned it had failed after calling days later. The failures boiled down to small oversights (a missing placard on an electrical box) and one medium problem rooted in an existing issue with the property that Diamond Solar had not flagged during the site survey for the permit. Rather than addressing all problems together, the company fixed them one at a time, and the system failed inspection twice more before he demanded a copy of the failed inspection report. By December — roughly two months after install — he finally learned about the property issue, which then took a month to fix because of the holidays and poor weather. After more delays caused,
Rick O. expected solid support after the sale but discovered his new home solar array wasn't delivering the practical benefit — he wasn't getting credits on his electric bill. His utility informed him that Diamond Solar had set up the account incorrectly, so he reached out multiple times to Diamond Solar for help, contacting Eilon, the project manager, and Leo, the owner, yet his requests went unanswered. Permission to operate was granted on January 22, 2024, but as of March 6 he still wasn't seeing any net-metering credits despite assuming the system was producing energy. He values continued service through installation and utility setup and found the lack of responsiveness frustrating. He left a three-star review and plans to update it if the company resolves the billing setup. The key takeaway for buyers: a granted permission-to-operate date doesn't guarantee your utility account and credits are in place — verify the meter and billing setup before assuming everything is complete.
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How We Got To Trust Score 62
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Serving customers for 7 years
BBB Rating: A-
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Natural Review Patterns
Reviews were posted naturally over time.
What You Can Expect
Hector M found the entire solar installation on his home effortless from start to finish. He ended up with a clean, professional roof install—the crew left everything tidy and well organized—and enjoyed consistent, clear communication with the company’s representative, who compared offers from six top installers and secured the best deal. Convinced enough to act, he recommended Diamond Solar to the neighbor across the street, who is already moving forward with their own install. What stuck with him most was the combination of spotless workmanship and a rep who shopped multiple competitors to deliver the best price.
Douglas picked Diamond Solar after his wife dug into options and collected a couple of bids; Diamond came in the most competitive. They tackled a residential solar install and finished the whole job in three days flat, working so quickly that the 90% upfront payment felt uncomfortable at the time. In hindsight he understands the rationale — the crew was moving fast enough that payments would have been due every day. Their lead point of contact stayed responsive, set realistic expectations and kept the schedule on track. The crew delivered honest work, completed the project within budget and on time. What sticks with him is the sheer speed and organization: a complete rooftop system installed in three days, which explains the large upfront draw.
After months of shopping for solar options, Richard connected with a representative who walked him through every detail in plain language. He shopped around for several months and found that this clear, straightforward explanation cut through the competing pitches and made the decision easy. He chose the company, and the crew handled the job smoothly — the work exceeded his expectations. What stuck with him most was the combination of uncluttered communication up front and a flawless follow-through on the day of the job.
Rosa hired Diomod Solar to install panels at her home and found the team did a great job. She walked away very happy after a smooth process: the crew stayed organized, showed up on time, and completed the work professionally. What stuck with her most was the punctual, well-run approach that kept the project moving without surprises.
Ben L hired Diamond Solar to install a residential solar PV system and appreciated their communication from start to finish. He found the crew easy to work with; they kept him updated at every stage, went out of their way to meet his needs, and delivered a system that has performed flawlessly. The steady updates combined with a trouble-free installation convinced him he’ll call them again for any future solar work.
Lydia I. had a solar system installed and then discovered she couldn’t get anyone at Diamond Solar to answer questions about the contract. She called, emailed and texted repeatedly, but no one picked up the phone and her messages went unanswered. She also found the company website offline, which heightened her worry. A prominent associate, Sean Molloy, told her he’s no longer with Diamond Solar, and that detail combined with the silence left her unsure whether the company is still operating or has gone out of business. She’s asking for a clear response to confirm the company’s status and to get answers about her contract.
Karl hired Diamond Solar for a residential solar install and found the whole process refreshingly straightforward. He experienced a clear, quick consultation, then watched the crew get the system up and running in a matter of days; the utility completed the official connection in about a month. The installation felt fast and efficient, and the follow-up service kept that momentum — responsive and reliable after the panels were live. His project supervisor was calm, hands-on and clearly knowledgeable, which made the technical parts easy to trust. The detail that stuck with him: from first meeting to a producing system in days and a full interconnection within a month.
Sharon hired Diamond Solar to outfit her home with a rooftop solar system and found the company's communication and punctuality especially notable. From the initial consultation through final commissioning, the team kept her informed about each next step and walked her through the plans in clear, thorough detail. Crews phoned ahead, arrived on time, and worked efficiently, turning what could have been a drawn-out project into a smooth sequence of well-organized visits. She appreciated the steady updates and professional manner at every stage. The end result was a completed installation with no loose ends — what stayed with her was the reliability: the crew showed up as scheduled and left her confident in how the system would perform.
Rick O. expected solid support after the sale but discovered his new home solar array wasn't delivering the practical benefit — he wasn't getting credits on his electric bill. His utility informed him that Diamond Solar had set up the account incorrectly, so he reached out multiple times to Diamond Solar for help, contacting Eilon, the project manager, and Leo, the owner, yet his requests went unanswered. Permission to operate was granted on January 22, 2024, but as of March 6 he still wasn't seeing any net-metering credits despite assuming the system was producing energy. He values continued service through installation and utility setup and found the lack of responsiveness frustrating. He left a three-star review and plans to update it if the company resolves the billing setup. The key takeaway for buyers: a granted permission-to-operate date doesn't guarantee your utility account and credits are in place — verify the meter and billing setup before assuming everything is complete.
Long-term Satisfaction
Recent customers rate Diamond Solar 4.3 ★
Long-term reviews carry the most weight in our methodology because they are most representative of what you should be paying for: a system that will perform for years.