Quantum Solar Designs reviews

Alex hired QSD in May 2020 for a 3.4 kW home solar installation and expected the system to meet its nameplate output. Instead he discovered QSD had used Enphase IQ7 microinverters rather than the IQ7Plus the manufacturer recommended, which Enphase estimated would cut first‑year production by about 15–20%. The array’s peak output ended up clipping to roughly 2.5 kW, so the system never reached its contracted nameplate power and produced significantly less energy over the year. None of that shortfall appeared in the contract or any documentation — the paperwork listed only the 3.4 kW nameplate and no estimated annual production or other performance metrics. After installation QSD refused to remedy the inverter choice, continued to circulate optimistic production estimates, and failed to set up the system on Wi‑Fi so remote monitoring was not enabled. Alex found them slow to answer phone calls and emails; when he pressed them about the clipping they first insisted their design would outperform the manufacturer’s recommendation, then supplied calculations he judged bogus, and finally claimed they had explained the design at signing. They were evasive in follow‑up communications and,,

RB hired Quantum Solar for a residential rooftop system and ended up with panels mounted but not permitted or working. Dawaine, the owner, showed up to collect payment, his crew installed the array without pulling city permits, and the panels sat inactive for about 2.5 years until permits were finally secured and the system was turned on. After that first visit, RB never heard from Dawaine again; the office handled all communications, sending emails that promised the owner would call but he never did. An office woman even visited the home and promised the owners would waive the remaining balance because of the delays, which RB accepted as fair — only to have the company later reverse course by email and demand final payment after months of trying to get a formal release. RB had dealt with many contractors and built or remodeled homes before, but found this pattern — unpermitted installation, a long non-working stretch, an absent owner, and a rescinded promise about payment — the clearest warning to anyone considering this company.

Jn P. signed up for a rooftop solar installation from Quantum expecting it to cover the household’s electricity needs, but they quickly discovered the system was undersized. Quantum had assured them the panels would be more than enough, yet over the past five years they kept facing year‑end bills from SCE that ran into the thousands of dollars. The root cause was an underestimated monthly and annual usage that Quantum didn’t properly account for or adjust despite the homeowner’s input, which turned into a recurring financial hassle. The lasting impression: a system promised to meet demand that didn’t, leaving them with repeated large SCE bills and frustration that their actual usage was ignored.