The short answer
In 2026, commercial and industrial solar in South Africa costs roughly R12 000 to R18 000 per kWp installed. That is a complete working system: panels, inverters, mounting, cabling, protection, labour and commissioning, not a parts list.
Smaller systems sit at the top of that range. Larger ones move towards R12 000 to R15 000 per kWp as the fixed costs spread over more panels.
| System size | Typical installed cost | Roughly suits |
|---|---|---|
| 20–50 kWp | R400 000 – R900 000 | Retail, offices, guesthouses, small workshops |
| 50–150 kWp | R900 000 – R2 500 000 | Packhouses, small cold stores, irrigation, lodges |
| 150 kWp+ | R2 500 000 upward | Plants, abattoirs, mills, large cold storage |
Two quotes for the "same" system often differ by 30 to 50%, which is why the specification matters more than the headline price.
What actually moves the price
- Storage or no storage. The big one. Batteries can add as much again as the array itself.
- Scale. Design, registration, scaffolding and commissioning barely change between a 30 kWp and a 100 kWp job, so the fixed slice per kWp falls as size rises.
- Mounting and roof condition. Clean IBR sheeting is quick. Tile, fragile asbestos sheeting or a roof that needs strengthening adds cost before a panel goes up. Ground mount adds civils and fencing but removes roof risk.
- Electrical distance and complexity. Long cable runs, three-phase balancing and switchgear upgrades add up quietly.
- Component grade. Tier-one panels and reputable inverters cost more up front and much less over twenty years. This is the wrong place to save.
Section 12B changes the real cost
A business can deduct 100% of the cost of a system under 1 MW in year one. Above 1 MW the deduction is spread 50%, 30% and 20% over three years. At the 27% company rate, the year-one deduction takes roughly a quarter off the effective cost:
| 68 kWp system at R14 000 per kWp | R952 000 |
| Section 12B deduction in year one, at 27% | − R257 040 |
| Effective cost after tax | R694 960 |
Two traps. The enhanced 125% allowance under Section 12BA ended on 28 February 2025 and was not renewed, so check the date on any article promising 125%. And SARS requires a valid Certificate of Compliance; without one the claim is refused. Confirm the treatment with your accountant.
A worked payback
A business paying R45 000 a month at an average R2,60 per kWh, using about 70% of its power in daylight:
| Energy bought per year (80% of the bill is energy) | ≈ 166 000 kWh |
| System sized to the daytime load | 68 kWp |
| Generated per year in Ermelo | ≈ 116 000 kWh |
| Actually used on site (≈ 85%) | ≈ 98 000 kWh |
| Saved per year | ≈ R254 000 |
| Effective cost after Section 12B | R694 960 |
| Payback | ≈ 2,7 years (3,7 before tax) |
Generation from PVGIS 5.3 for Ermelo at about 1 700 kWh per kWp a year, north-facing at 26°, 14% system losses.
Why the payback keeps getting shorter
The thing solar avoids keeps getting dearer. NERSA approved an 8,76% increase for Eskom-direct customers from 1 April 2026 and 9,01% for municipal distributors from 1 July 2026.
The time-of-use spread matters even more. On Eskom's 2026/27 Megaflex schedule the winter peak energy charge is 720,19 c/kWh against 120,03 c/kWh off-peak, both excluding VAT: six times more for the identical unit. If your operation runs hard through winter peak windows, every unit solar or a battery displaces there is worth several times the average.
Solar does not automatically cut the demand charge
Larger tariffs bill the energy you use and your notified maximum demand, your highest half-hour draw. Solar cuts the first directly. It only touches the second if generation reliably coincides with your peak draw. Where demand charges are a big slice of the account, the answer is usually solar plus a modest battery for peak shaving, designed from your half-hourly data.
Work out your own number
- Solar savings calculator: size, saving and payback from your bill.
- Solar vs a diesel generator: the per-kWh comparison.
- Get a free quote: three questions, and it reaches us on WhatsApp.
How much does commercial solar cost per kWp in South Africa?
In 2026, commercial and industrial solar typically costs about R12 000 to R18 000 per kWp installed for a complete working system. Smaller systems sit at the top of that range.
Does Section 12B still apply in 2026?
Yes. A business can deduct 100% of the cost of a system under 1 MW in year one. The enhanced 125% Section 12BA allowance ended on 28 February 2025. SARS requires a valid Certificate of Compliance.
What is a typical payback for commercial solar?
It depends on daytime load and tariff. In our worked example, a business paying R45 000 a month lands at about 2,7 years after the Section 12B deduction and 3,7 years before it.
Get a price for your site
It opens as a WhatsApp message to Mari Louise with a reference number, so the first call is about your site instead of the basics.
Rather talk? Call the office on 017 004 0001 or WhatsApp 072 326 0268.