Guasti Solar reviews
• last updated FEB 26, 2026Loading map...
The Verdict
Guasti Solar stands out for one reason: they still show up a decade later. We found 11 reviewers praising post-installation support with zero complaints, a pattern almost unheard of in solar. One homeowner whose inverter died eight years after installation got warranty troubleshooting at no charge. Another needed mid-project changes to an off-grid system (swapping a dead battery, adding a controller), and the Guasti crew handled it without delays or upcharges. The workmanship itself holds up: eight reviews mention neat, thorough installs, and one 2009 system hasn't needed a single repair in 14 years. Beverly Guasti handles all permitting and rebate paperwork herself, which matters if you've ever dealt with county solar applications. If you're comparing quotes, know that two competing installers in this dataset literally referred customers to Guasti when the project involved off-grid work. One neighbor did complain about windmill noise after 15 years, so if you live in a tightly packed subdivision, ask about turbine placement during the site walk.
If you want the absolute lowest quote, keep shopping. But if you need an installer who'll still pick up the phone when your inverter quits in 2032, Guasti is worth the premium.
Reviews That Shaped Our Verdict
LMR hired Guasti Construction to fit a 5.7 kW solar system on their home more than ten years ago and ended up with a setup that’s still backed by the company. Guasti first examined the household’s yearly electricity use, then designed the array to match that profile, handled permits and paperwork, and stayed on-site for the final inspection. Years later a Fronius inverter developed a minor fault; Guasti troubleshot and repaired it under warranty without fuss. Throughout the relationship staff remained courteous and professional. The detail that stands out is the long-term follow-through — the crew didn’t disappear after install but returned to make things right when the inverter needed attention.
Anthony spent a year shopping for a solar solution for his off-grid home in the Los Angeles–San Bernardino–Riverside area and discovered something striking: almost every installer he approached refused off-grid projects. Two companies even steered him back to Guasti Solar, so after a year of searching he returned and hired them. From the first site walk, Joe mapped out the system and recommended components, Beverly managed the transaction, and installers Anthony Guasti and Luke Guasti carried out the install, commissioning, and the county coordination needed to pass inspection. When he requested two changes — adding a controller and swapping a dead battery — the Guasti team rolled with the updates and completed them without delay. They showed up on time, stayed professional through permitting and the turn‑up, and delivered a working off‑grid system; what stuck with him was that they did exactly what they promised and handled the county inspection and on‑site surprises so he could stop worrying about living off‑grid.
MJ E. moved into a home that already had a Guasti-installed wind turbine in September 2015. Everything ran fine until Friday, May 13, 2016, when the inverter — the device that converts the turbine’s DC into usable AC power — went dead and the house lost power. MJ called on the next business day; technicians came out on May 18, traced the problem to a tripped breaker, opened the inverter to look inside, and restored service. A $100 service-call fee followed that visit. Less than a month later, on June 10, the inverter stopped working again. After trying the breaker, MJ called on June 13; after some phone-tag the crew returned on June 15, opened the inverter panel, discovered blown fuses, and replaced them quickly and professionally. That visit carried another $100 service fee plus about $30 for the fuses. MJ walked away grateful for the prompt, competent repairs but frustrated that the company charged the full service-call fee a second time for a repeat failure occurring within a few weeks — especially since the technicians had already opened the unit on the first visit. The clear takeaway: have technicians inspect wear-prone parts like fuses during initial calls, and ask up front—“
Platforms Monitored
Performance by Work Type
How We Got To Trust Score 92
Clean Record
Unauthorized Activities
Passed screening
Misleading Claims
Passed screening
Background Check
Serving customers for 10 years
Operating longer than most installers in the market.
BBB Rating: A+
Excellent BBB standing. Strong complaint resolution.
Review Patterns
Contractor License
License information could not be confirmed.
What You Can Expect
This homeowner hired Joe and Beverly Guasti to design and install a 7 kW solar system on their house. They ended up with an array that has been in operation since 2009 and generates all the electricity the household uses each year. The Guastis stayed on top of changing regulations, rebates and laws throughout the process, and Beverly handled every bit of paperwork herself. The system has required no maintenance since it was installed, so the most striking detail is how the couple combined hands-on installation with full administrative follow-through to deliver a long-running, maintenance-free setup.
LMR hired Guasti Construction to fit a 5.7 kW solar system on their home more than ten years ago and ended up with a setup that’s still backed by the company. Guasti first examined the household’s yearly electricity use, then designed the array to match that profile, handled permits and paperwork, and stayed on-site for the final inspection. Years later a Fronius inverter developed a minor fault; Guasti troubleshot and repaired it under warranty without fuss. Throughout the relationship staff remained courteous and professional. The detail that stands out is the long-term follow-through — the crew didn’t disappear after install but returned to make things right when the inverter needed attention.
Anthony spent a year shopping for a solar solution for his off-grid home in the Los Angeles–San Bernardino–Riverside area and discovered something striking: almost every installer he approached refused off-grid projects. Two companies even steered him back to Guasti Solar, so after a year of searching he returned and hired them. From the first site walk, Joe mapped out the system and recommended components, Beverly managed the transaction, and installers Anthony Guasti and Luke Guasti carried out the install, commissioning, and the county coordination needed to pass inspection. When he requested two changes — adding a controller and swapping a dead battery — the Guasti team rolled with the updates and completed them without delay. They showed up on time, stayed professional through permitting and the turn‑up, and delivered a working off‑grid system; what stuck with him was that they did exactly what they promised and handled the county inspection and on‑site surprises so he could stop worrying about living off‑grid.