The rapid growth of South Africa's home solar market has attracted a wave of installers ranging from highly professional registered companies to opportunistic operators who entered the industry with minimal training during the load-shedding peak. The consequences of choosing poorly are significant: systems that underperform, inverters that fail within months, roof leaks from improperly sealed panel mounts, batteries that lose capacity after a fraction of their rated cycle life, and installers who are unreachable when something goes wrong. Unlike most home services, a poorly installed solar system can also create genuine safety hazards — electrical fires, arc faults, and unsafe roof penetrations are all documented outcomes of substandard installations.
This guide covers the specific red flags that should give you pause before you sign, at the component specification stage, during the installation itself, and in how the company handles the post-installation relationship.
Red Flags in the Quote and Sales Process
A quote that does not specify component brands and models is a quote you cannot evaluate or compare. A legitimate installer specifies the inverter brand and model, the panel brand and wattage, the battery brand and chemistry (LiFePO4 vs lead-acid), and the cable ratings. A quote that says "5kVA inverter," "8 x 500W panels," and "10kWh battery" without naming the specific products is either hiding the fact that low-quality components will be used, or the installer is not sure what they will source.
Insist on brand and model specifications in the quote before comparing prices. Then look up each component: Is the inverter brand well-regarded in the SA market? Does the panel brand have a local distributor who can honour the 25-year performance warranty? Is the battery LiFePO4 chemistry (the current standard) or lead-acid (older, fewer cycles, heavier)? These questions take ten minutes and save you from discovering the answers the hard way.
Be cautious of high-pressure sales tactics — particularly "special prices" that expire at end of the month, or salespeople who discourage you from getting competing quotes. Reputable companies do not need to prevent comparison shopping. The solar market in South Africa is competitive enough that price variation between similar specifications from reputable companies is meaningful but not extreme — a quote dramatically below the rest is a signal to investigate, not celebrate.
No COC or Dismissiveness About Compliance
Every solar installation in South Africa that connects to your home's electrical system must be performed by a registered electrician and must result in a Certificate of Compliance (COC). The COC certifies that the installation meets the standards of SANS 10142 (the wiring standard) and any applicable solar-specific regulations. This is a legal requirement, not a formality.
A red flag is any installer who says the COC "is not necessary," "costs extra," or "can be arranged later." It is necessary, it should be included in the quoted price, and it should be issued at completion — not months later or by someone who never saw the installation. Without a COC, your home insurer may not cover damage caused by or to the solar system, and you have no documented proof that the installation was compliant.
Ask specifically: "Which registered electrician will issue the COC, and are they employed by your company or subcontracted?" Knowing the answer tells you whether the electrical compliance is integrated into the installation or an afterthought.
Unknown Component Brands With No SA Distributor
Solar panels carry a 25-year performance warranty from the manufacturer. Inverters typically carry 5-year warranties. Batteries carry 5–10-year warranties. These warranties are only meaningful if the manufacturer or their SA distributor will still be operating when you need to claim against them.
Many of the cheapest panels on the South African market are from second-tier Chinese manufacturers with no local distributor presence. If the manufacturer exits the SA market, the 25-year warranty becomes a document with no one to honour it. Ask your installer: "Who is the local South African distributor for this panel brand, and how do I contact them directly if I need to claim against the warranty?"
The same applies to inverters. Well-established brands like Sunsynk, Deye, Victron, and SolarEdge have active local distributors and established service networks. Generic or off-brand inverters may be cheaper but can be nearly impossible to repair or replace under warranty if the supplier has moved on.
No Waterproofing Detail for Roof Penetrations
Every solar installation on a pitched tile or IBR roof requires roof penetrations for the mounting brackets or rails. If these penetrations are not properly waterproofed, they will eventually leak — damaging ceilings, insulation, and the structural timber in your roof. Roof leak damage from solar installations is one of the most common post-installation complaints in South Africa.
Ask your installer specifically what waterproofing method they use for roof penetrations. The answer should involve either flashing kits specific to the tile or roof sheet type, or an appropriate sealant with a documented application method. "We seal it" is not an adequate answer. Ask to see photographs from a previous installation showing how the penetrations were handled.
Flat roof installations have their own waterproofing requirements — ballasted systems (where panels are weighted down without penetration) avoid this problem but require structural confirmation that the roof can handle the additional load.
No Site Assessment Before Quoting
A legitimate installer will assess your site before providing a final quote. This includes: the orientation and pitch of your roof (to calculate actual panel yield), the available roof space and shading from trees or adjacent structures, the condition of the roof (a deteriorating roof needs to be addressed before panels are installed on top of it), the location of the distribution board and the cable route, and the structural capacity to support the panel weight.
An installer who quotes without visiting the site is quoting without knowing what the actual installation involves. This creates two risks: the quote may be inaccurate (leading to unexpected additional costs during installation) and the system may be sized or positioned based on assumptions that do not match your actual roof conditions.
No Post-Installation Monitoring Setup
Modern hybrid inverters include monitoring software (typically a phone app and web portal) that shows real-time and historical data on solar generation, battery state of charge, grid consumption, and system performance. A professional installer will configure this monitoring as part of the installation and show you how to use it.
If an installer does not mention monitoring, or sets up the system without configuring it, you have no way to know whether the system is performing as specified. A system that appears to be working (lights are on, battery is charging) may be significantly underperforming — and without monitoring data, you will not know until your electricity bill fails to decrease as expected.
Quick Checklist Before You Sign
- Require specific brand and model for every major component in the written quote
- Confirm a COC will be issued at completion by a registered electrician — included in the price
- Ask who the SA distributor is for the panel and inverter brands — and verify this independently
- Ask specifically how roof penetrations will be waterproofed — get photographs from previous jobs
- Insist on a site visit before accepting a final quote
- Confirm that system monitoring will be configured as part of the installation
- Get at least three quotes from registered installers with local references
- Check that the installer or their electrician is registered with the relevant bodies — SAPVIA, ECSA, or the DoEL electrical contractor register
Reading reviews from homeowners who have lived with their solar system for 12+ months — not just people who had it installed last month — gives you the most honest picture of what to expect. KiesSlim makes it easy to find those reviews in your area before you commit.