Sunternal Solar reviews
• last updated FEB 26, 2026Loading map...
The Verdict
We found a company that's left customers waiting over a year with paid deposits and non-functioning systems. Multiple reviewers paid in full only to discover Sunternal stopped responding, lost licensing in some states, or couldn't complete basic grid hookups. One homeowner shelled out $30,000 and still has
If you're looking at Sunternal, walk away. We found too many customers stuck with deposits, unfinished installs, and systems that never activated—many paid in full and waited a year or more with no resolution.
Reviews That Shaped Our Verdict
Justin B. signed up for a rooftop solar installation, paid more than $30,000, and 1½ years after the contract he still doesn't have functioning panels. He ended up with equipment sitting on the roof but no activation: the company never completed the PG&E application and he discovered they had lied in writing about the reimbursement rates he'd qualify for if he rushed the project. Over a year after paying in full he faces higher electric bills while subcontractors—who he found to be decent—left him with inactive hardware. He also unearthed signs the company isn't paying its workers and flagged pending lawsuits against Sunternal, and received repeated promises of a fix—“any day now”—from employees who later left the firm. His lasting image is a paid invoice, dead equipment, and the chilling possibility that legal recourse evaporates if the company folds.
Daniel A. had a rooftop solar system installed in 2019 and soon discovered a small roof leak originating from the installation. He watched the company return again and again to attempt repairs — calling them annually to reopen the issue — but the fixes never held. After rain in November 2021 he called once more; a promised visit got stretched out into months (he notes a five-month wait for a crew), and by then the roof and interior had accumulated more water damage. Two months have passed since the last repair attempt and the company still hasn’t come back to finish the job. On paper the system carries a solid warranty, but he experienced that paperwork as hollow when service delays left a minor leak to become years of unresolved damage. He left a one-star review and wished he could give less; the takeaway is stark: a small installation problem became prolonged water damage because repeated service visits were delayed or ineffective.
Alexander R. bought his first home with an aging roof and hired SUNTERNAL CONSTRUCTION INC. after a salesperson, Ron Monatlik, kept reassuring him that roof work wouldn’t be a problem — even promising to remove and reinstall panels at no charge if the roof needed replacing. He hesitated at first because of the roof, but after repeated assurances he signed the contract, paid in full, and ended up with a 26-panel system. He also asked to be completely off-grid, which never materialized, yet he still sent referrals to Ron. When billing time came, Alexander discovered a nearly $4,000 true-up tied to the system sizing; Ron shrugged it off, blamed the homeowner’s electricity use, and told him to take it up with PG&E, turning a tense and unhelpful conversation into a dead end. Months later, when a roof replacement became unavoidable, Ron quoted about $5,000 to pull and reinstall the panels and, when reminded of his earlier promise, answered “Not My Call” and went silent. What sticks is how an explicit, comforting promise about future roof work evaporated into a five‑thousand‑dollar surprise and unreturned assurances — the detail that shaped the entire relationship.
Platforms Monitored
Performance by Work Type
How We Got To Trust Score 49
No Red Flags
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
Not BBB rated.
Natural Review Patterns
Reviews were posted naturally over time.
Contractor License
License information could not be confirmed.
What You Can Expect
Justin B. signed up for a rooftop solar installation, paid more than $30,000, and 1½ years after the contract he still doesn't have functioning panels. He ended up with equipment sitting on the roof but no activation: the company never completed the PG&E application and he discovered they had lied in writing about the reimbursement rates he'd qualify for if he rushed the project. Over a year after paying in full he faces higher electric bills while subcontractors—who he found to be decent—left him with inactive hardware. He also unearthed signs the company isn't paying its workers and flagged pending lawsuits against Sunternal, and received repeated promises of a fix—“any day now”—from employees who later left the firm. His lasting image is a paid invoice, dead equipment, and the chilling possibility that legal recourse evaporates if the company folds.
Kris H. started a residential solar installation that turned into a one-and-a-half-year ordeal marred by delays and back-and-forth. They watched the project stall repeatedly: just before crews showed up the company demanded a last-minute change order saying more panels were required, then discovered the original plans didn’t match site conditions and had to be redrawn and resubmitted. Longer stretches of inactivity followed while approvals and corrections dragged on. Subcontractors who finally came to the property complained that the company hadn’t paid them for previous jobs, leaving Kris feeling caught between wanting the work done and worrying about subcontractors’ unpaid bills. When the installer finally invoiced, Kris paid immediately through bank bill pay and saw the money leave their account — yet the company continued to send multiple daily texts demanding payment, and an employee named Melissa even threatened to turn off the system. The clearest takeaway: be prepared to chase paperwork and payments. Prospective buyers should insist on plans that accurately reflect the site before work begins, get written confirmation that any bank bill-pay has been received, and secure sub
Marshal contracted Sunternal in early 2022 to install a residential 5 kW solar array paired with 20 kWh of batteries. He found the hardware to be excellent and the system now works as promised, but the installation dragged on far longer than expected. What started with an agreement in February 2022 and a signed contract in April turned into panels going up in August, permission to operate arriving in October, batteries installed in November that initially didn’t work, and everything finally functioning in January. Along the way he was repeatedly pressed for payment before the job was complete, which became the most frustrating part of the experience. He advises future buyers to build a 10% holdback into the original contract and only release it after you have permission to operate and the batteries are demonstrably working — otherwise it can be hard to get timely attention from the crew.