20kW Solar System Price in South Africa (2026)
A 20kW solar system from Erazon Solar costs R246 222 installed, including panels, battery, installation and the electrical CoC. A 20kW three-phase system is for homes, farms and small businesses with a three-phase supply and high daytime usage.
20kW solar system prices: our packages
Prices and equipment are live from our price list. Daily output is an estimate for Pretoria, based on about 5.6 peak sun hours a day.
Deye 20kW 3-Phase (V2)
- Deye 20kW H/V 3-Phase Inverter
- 2x Dyness Powerbrick 14.3kWh Battery
- 36x Canadian Solar 620W Bi-Facial Panel (22.32 kWp, about 100 kWh a day)
- 5 Year Workmanship Warranty
What can a 20kW solar system run?
- Three-phase loads such as large pumps and machinery
- Whole-home or small-business backup
- Large aircon and heating loads
- About 28kWh of high-voltage battery storage
- Big daytime loads directly on solar
It is not for single-phase homes. Those are better served by a 12kW or 16kW single-phase system.
What is included in the 20kW price?
- Inverter, lithium battery and solar panels as listed
- Installation by our Pretoria-based team
- Electrical Certificate of Compliance (CoC)
- 5 Year Workmanship Warranty
- Manufacturer warranties on the equipment
What can change the final price?
- Extra batteries if you want longer backup at night
- An old or full distribution board that needs upgrading first
- Long cable runs between the roof, inverter and DB board
- Ground-mounted panels instead of a roof mount
- A three-phase supply, which needs a three-phase inverter
How does 20kW compare with other sizes?
| System size | Installed price | Battery | Panels |
|---|---|---|---|
| 5kW solar system | R62 780 – R72 780 | 5.12 kWh | 6 |
| 6kW solar system | R80 596 – R92 910 | 10.24 kWh | 8 |
| 8kW solar system | R106 400 – R108 086 | 10.24 kWh | 10 |
| 10kW solar system | R109 402 – R123 841 | 10.24 kWh | 12 |
| 12kW solar system | R144 488 – R155 746 | 15.36 kWh | 18 |
| 16kW solar system | R192 175 – R195 775 | 20.48 kWh | 24 |
| 20kW | R246 222 | 28.6 kWh | 36 |
Not sure which size you need? Try our solar calculator, see inverter and battery backup options, or read how our hybrid solar installation works.
20kW solar system: common questions
How much does a 20kW three-phase solar system cost?
The live installed price for our 20kW three-phase Deye package is on this page, with 36 panels, about 28kWh of battery, installation and the CoC.
How do I know if I have three-phase power?
A three-phase supply has a triple main breaker in the DB board. We confirm this at the assessment.
Why a high-voltage battery?
High-voltage batteries pair with the 20kW three-phase inverter for efficient charging and discharging at this size.
Is this suitable for a business?
Yes, for small businesses and farms with a three-phase supply. Larger commercial sites need a custom design.
Get a price for a 20kW system on your home
Tell us roughly what you spend on electricity and your suburb. We confirm the right size before you pay anything.