Panel brand gets most of the attention in solar sales conversations — homeowners compare wattage, efficiency percentages, and manufacturer reputation as if that's the main risk factor in the purchase. In practice, the warranty structure behind the installation — not just the panels — is usually the bigger factor in how well-protected you actually are if something goes wrong.
Three Different Warranties, Often Confused as One
A solar purchase typically comes with at least three separate warranties, each covering something different:
- Product warranty — covers manufacturing defects in the panel itself, from the panel manufacturer, typically for a decade or more
- Performance warranty — guarantees the panel won't degrade below a certain output percentage over time, also from the manufacturer, usually running much longer than the product warranty
- Workmanship warranty — covers the actual installation quality: wiring, mounting, waterproofing, configuration — from the installer, not the panel manufacturer, and often the shortest and least standardised of the three
Most installation problems that actually occur — leaks, loose mounting, wiring faults, incorrect configuration — fall under workmanship, not panel defects. Yet workmanship warranty terms vary far more between installers than panel specs vary between reputable panel brands, making it the more important thing to actually compare.
Why This Gets Overlooked
Panel brand is easy to research online before ever speaking to an installer, which makes it feel like the primary decision. Workmanship warranty terms are buried in a specific installer's contract, harder to compare across quotes, and rarely volunteered upfront unless asked — so it's the factor homeowners are least equipped to compare, despite it mattering more for the problems that actually tend to happen.
What to Actually Ask For
Before committing to an installer, ask specifically:
- How many years does the workmanship warranty cover, separate from the panel manufacturer's warranties?
- What exactly does it cover — leaks, mounting, wiring, inverter configuration?
- What happens if the installer goes out of business before the warranty term ends? Is there any backing beyond the company itself?
- Is the workmanship warranty in writing, in the contract, not just a verbal assurance?
A short or vague workmanship warranty is a more meaningful red flag than a slightly less premium panel brand — panels rarely fail outright, but poor installation work shows up within the first few years with real regularity.
Panel Brand Still Matters — Just Less Than You'd Think
This isn't an argument that panel brand is irrelevant — established manufacturers with a strong local presence are easier to claim against if a genuine product defect does occur, and efficiency differences do compound over decades. It's an argument for proportion: don't let panel brand comparison consume the whole due-diligence conversation while workmanship warranty terms go unasked.
Vet the Installer, Not Just the Panel
Installers vetted on ADEO are checked on their standing and track record before being listed, which is a reasonable starting filter — but warranty terms are specific to each company's own contract and still worth confirming directly for any installer you shortlist. Get your baseline system estimate from our solar calculator first, then take that into warranty conversations with real numbers in hand.
Frequently Asked Questions
How long should a workmanship warranty typically run? There's no universal standard, but a workmanship warranty noticeably shorter than the panel product warranty is worth questioning — ask the installer directly why the gap exists.
What happens to my warranty if the installer closes down? This varies and is worth asking upfront — some installers work with underwritten or insurance-backed warranty products specifically to cover this scenario, which is worth asking about directly.
Does a longer performance warranty always mean a better panel? Generally a signal of manufacturer confidence, but compare the actual guaranteed output percentage at specific year milestones, not just the warranty's total length, since terms vary in how they're structured.
Writes about solar and renewable energy for South African homes and businesses at SolarTally, and cross-checks every guide against current tariffs and installer standards.
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