Diamond Solar reviews
• last updated FEB 26, 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.
Reviews That Shaped Our Verdict
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.
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,
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What You Can Expect
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.
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.
Serog H hired the company to put solar on his home after they laid out a long list of post-install promises about monitoring and follow-up. Once the crew finished the install, those promises evaporated: he stopped getting callbacks and the remote monitoring setup never happened. The team had said they'd install an app on his tablet or phone so he could check his panels’ production, but more than three months later the app still wasn't set up. He called Sean roughly ten times without getting a response, and the company eventually shifted to saying they'll send a monthly email with performance updates instead. The clearest takeaway: the installation itself went ahead, but persistent attempts to get the promised app and any meaningful post-install service—about ten calls over three months—produced no real response.