Solar Panel Angle & Direction
The complete South Africa guide

Why your panels must face north

South Africa sits between 22°S and 35°S latitude. This means the sun always arcs across the northern half of the sky — never the south. Every solar panel in SA must face north.

This seems obvious to installers, but it genuinely confuses first-time buyers who have read Northern Hemisphere solar guides online (where panels face south). In the Southern Hemisphere, the situation is reversed.

The sun's path changes through the year: in June (winter), the sun is lower in the sky and tracks more to the north. In December (summer), it's higher and more overhead, but still arcs northward. The practical result: a north-facing panel captures the most energy year-round.

Installers should provide you with a compass bearing (azimuth) for your panels, not just "north-ish." The difference between 350° and 10° azimuth is negligible. The difference between 10° and 45° (northeast) is a measurable output loss of 5–12% annually.

The tilt angle rule — match your latitude

The optimal tilt angle for fixed (non-tracking) panels equals your site's latitude. This maximises annual energy capture by pointing the panel directly at the sun's average position.

Steeper tilts (latitude + 5°) favour winter output when the sun is lower. Shallower tilts (latitude – 5°) favour summer. For most SA homes with Eskom bills year-round, exact latitude is the right default.

What about flat roofs?

Tilt frames are non-negotiable on flat roofs. Without them, water pooling shortens panel life, dust accumulates and cuts output by 8–12%, and output is already 15–25% below a correctly tilted panel.

Two types of tilt frames:

• Ballasted (weighted): No roof penetrations. Good for waterproofed membranes. Heavier — requires structural assessment for wind uplift.
• Mechanically fixed (penetrating): Bolted through the roof slab. Requires careful waterproofing around each penetration point.

Cost range: R1 500–R3 000 per panel for quality tilt frames. Minimum recommended angle: 15°, ideally 20°+ for effective self-cleaning in rain. For a detailed breakdown of how different roof materials affect solar mounting, read our roof compatibility guide.

East/West split arrays

Scenario: a home with no north-facing roof, or a homeowner wanting to optimise for time-of-use tariffs.

An east/west split array loses roughly 10% annual output versus a pure north-facing setup, but produces electricity across a longer daily window. Under City Power's C1 or Homepower tariff structures (where peak pricing is 7–9am and 5–9pm), an east-facing string captures morning peaks and a west-facing string captures evening peaks.

Production comparison:

• North single string: Bell curve peaking at solar noon. High total output, concentrated in the middle of the day.
• E/W split: Flatter curve with two smaller peaks — morning and afternoon. Better aligned with actual household consumption patterns and ToU billing.

Worth considering if: your roof only offers east and west faces, you're on a ToU tariff, or you want to maximise self-consumption without battery.

Shading — the silent output killer

For a full explanation of shading effects and technology solutions (string inverters, power optimisers, microinverters), read our shading impact guide.

What to ask your installer

1. What is the exact azimuth bearing of my panels?
2. What tilt angle will the panels sit at?
3. If my roof is flat, what tilt frame system are you using and what angle does it produce?
4. Have you checked for afternoon shading from the neighbour's tree or wall?

Any professional installer should answer these without hesitation. If they can't, get another quote.