What To Consider When Choosing A Solar System Vendor?

Choosing a solar system vendor in South Africa requires checking at least five things before signing: PV GreenCard accreditation of the installer, membership of the South African Photovoltaic Industry Association (SAPVIA), the financial stability of the company, written warranty terms covering both panels and workmanship, and a contract that clearly itemises equipment, labour, performance guarantees, and a Certificate of Compliance on completion. South African buyers also need to factor in financing — major banks such as Standard Bank offer dedicated solar finance products, and the chosen vendor usually needs to be on the bank’s approved-installer list before finance will release.

Why the Choice of Vendor Matters in South Africa

A poorly installed solar system fails prematurely, damages roofs, voids manufacturer warranties, and leaves the buyer with no practical recourse if the installer disappears. Persistent Eskom load-shedding means the system runs harder and longer than in many other markets, raising the stakes on component quality and thermal management. The South African residential solar industry is largely unregulated at the installer level — there is no compulsory national licensing scheme — which makes vetting the vendor a buyer responsibility, not a regulator’s.

Credentials and Accreditation to Verify

Credentials are the single strongest filter on a solar vendor shortlist. Treat the following as the baseline, not the ceiling:

Credential	What it signals
PV GreenCard accreditation	Installer has been trained and assessed under the PV GreenCard programme, the SA solar industry’s recognised installer competence standard
SAPVIA membership	Member of the South African Photovoltaic Industry Association, the SA solar industry body
Department of Labour electrical-contractor registration	Legally required for solar installations above the DIY threshold; distinct from PV GreenCard
Manufacturer authorisation	Named authorised installer for the specific panel and inverter brand being quoted; without this, manufacturer warranty claims can be refused

PV GreenCard and SAPVIA both publish directories of accredited installers and members on their respective websites — these directories are the practical starting points for shortlisting vendors anywhere in the country.

Financial Stability and Track Record

South African solar companies have a high business-failure rate; a vendor that disappears voids the workmanship warranty. Before signing, ask:

• How long has the vendor traded under the same name?
• Can the vendor provide references from installations at least two to three years old, not just recent commissions?
• Check the company’s CIPC registration and whether its directors have been involved in business rescue or liquidation
• A vendor asking for full payment upfront before any work has started is a significant red flag — standard practice is a deposit on signing, with the balance due on commissioning and issue of the electrical Certificate of Compliance

Warranty Terms to Read Carefully

A solar system has overlapping warranties from different parties. Read each one in writing before signing:

Warranty	Typical term	Honoured by
Panel performance warranty	25 years (typically guaranteeing 80–85% of nameplate output at year 25)	Manufacturer
Panel product warranty	10–12 years (material defects)	Manufacturer
Inverter warranty	5–10 years (inverters usually need replacement well before panels)	Manufacturer
Workmanship warranty	1–5 years (covers installation defects — the warranty most likely to be invoked)	Installer

Confirm in writing who honours each warranty and what the claims process is. A vendor offering a longer workmanship warranty than competitors is signalling confidence in their own work.

Contract Terms and Red Flags

A complete solar contract should contain the following items: an itemised quote showing equipment by brand and model, labour, mounting, electrical work, commissioning, and grid connection all broken out separately; a written performance guarantee on expected kWh output with a stated remedy if the system underperforms; a timeline with consequences for delay; a payment schedule that ties the balance to commissioning and Certificate of Compliance issue (never balance on delivery of equipment); and a commitment from the vendor to arrange the electrical Certificate of Compliance.

Red flags include vague or verbal-only quotes, full-upfront-payment demands, no written performance guarantee, no mention of the CoC, “today-only” pricing pressure, and unusually low quotes that omit commissioning or grid-connection costs. Where a buyer has already shortlisted a vendor and wants the contract reviewed before signature, Burger Huyser Attorneys’ commercial law practice can review the contract for unfair clauses, payment-trap terms, and missing performance guarantees — an inexpensive step relative to the cost of the system.

Comparing Quotes on an Apples-to-Apples Basis

Two quotes are only comparable when they specify the same components and scope. Before comparing rand amounts:

• Ensure each quote specifies the same panel brand and model, inverter brand and model, and mounting type
• Ask each vendor to express the system in expected annual kWh output, not just rand — this normalises quotes that use different equipment combinations
• Compare total installed cost per watt peak (R/Wp); typical SA residential systems sit between roughly R/Wp 15 and R/Wp 25 depending on equipment quality
• Include in the comparison: warranty length, monitoring system included, after-sales service scope, and expected annual degradation

Financing the System

Major South African banks, including Standard Bank, offer dedicated solar finance products that spread the system cost over the loan tenor. Some vendors offer their own finance arrangements, which typically carry higher effective interest rates than bank finance. Confirm early that your preferred vendor is on your bank’s approved-installer list; the bank’s solar finance usually will not release to an unlisted installer. The financing pathway effectively constrains the vendor shortlist — establish the finance route before finalising vendor selection.

After-Sales Service and Monitoring

After installation is when most solar contract disputes actually arise. A monitoring system (app or web portal) lets you track daily output and catch underperformance early. Confirm the vendor’s service response time and whether remote diagnostics are included in the service contract. Ask who the actual on-site installation team will be — subcontracting the install to unknown third parties is common and weakens accountability if something goes wrong.

Frequently Asked Questions

What is the PV GreenCard and why does it matter?

The PV GreenCard is a South African solar industry quality programme that trains and accredits solar PV installers against a defined competence standard. It is the single most reliable proxy for installer competence in an SA market where solar installer licensing is not compulsory, and a vendor without it is harder to hold accountable if the installation goes wrong.

How long should a solar system last in South Africa?

A well-installed residential solar PV system in South Africa should produce usable power for 25 years or longer. Panels typically carry a 25-year performance warranty, while inverters usually need replacement at the 10–15 year mark. The system will gradually lose output (typical degradation is around 0.5% per year) but should still generate the majority of its rated output at year 25.

Should I pay a solar vendor upfront?

No. Standard payment terms in the South African solar industry are a deposit on signing the contract, with the balance due only after the system has been commissioned and a Certificate of Compliance issued. A vendor demanding full payment upfront, before any work has started or been completed, is a significant red flag.

How do I compare two solar quotes fairly?

Normalise each quote to rand per watt peak (R/Wp), confirm that each specifies the same panel and inverter brands and models, and ensure each includes the same scope (mounting, electrical work, CoC, commissioning, monitoring). If a quote is vague on equipment or scope, ask for a re-quote before comparing; vague quotes almost always end up more expensive once the missing items are added.

What happens if my solar vendor goes out of business after installation?

Workmanship warranties are honoured by the installer, not the manufacturer, so a vanished installer leaves the buyer to find a new electrician (at the buyer’s cost) for any installation defects. Component defects remain covered by the manufacturer’s product warranty. The main pre-signing mitigations are vetting the vendor’s financial stability, asking for references from installations at least two to three years old, and asking whether the workmanship warranty is underwritten by a third party.

Need a legal review of the solar vendor contract before you sign? Burger Huyser Attorneys’ commercial law practice reviews vendor contracts for South African buyers who have already shortlisted a solar installer. Our commercial law team — based at our head office in Linden, Randburg, with branches across Gauteng — can flag unfair clauses, payment-trap terms, and missing performance guarantees before you commit. Contact our head office on 011 888 0246 to schedule a contract review.