Size.Solar
Calculated solar panel tilt angle in Port Elizabeth
We analysed solar production across a range of tilts (-64° to -4°) to find the optimal settings for your location. The more frequently you adjust your panels, the greater the potential energy gain.
33°
Set it once for the entire year. The simplest approach.
Method: Polynomial regression on annual production data.
Winter: 40°
Summer: 26°
Provides a 0.2% gain over the best fixed tilt.
Method: Decoupled regression on 6-month seasonal data.
Offers a 4.9% gain over the best fixed tilt.
Method: Decoupled regression on 3-month seasonal data.
Achieves the maximum 5.9% gain over the best fixed tilt.
Method: Decoupled regression on monthly data for ultimate optimization.
*Tilt angles are relative to horizontal. For Port Elizabeth, positive angles face North and negative angles face South. Gains are estimates based on modeling.
Quote-ready tilt decision
Give installers one fixed-angle target first
Start the quote conversation with 33° North. Seasonal adjustment is only worth pricing if a supplier can show that roughly 4.9% extra production beats the cost, access risk, and warranty complexity of adjustable frames.
Base quote
33° North
Best default for normal roof-mounted systems and the first number to send to installers.
Adjustable option
Winter: 40° North
Summer: 26° North
Four seasonal changes model about 4.9% gain. Monthly adjustment models about 5.9%.
Installer checks
Roof pitch, available rail angles, wind loading, waterproofing, access for cleaning, and whether adjustment affects warranty.
Direction check
In Port Elizabeth, the practical target is a north-facing array. Shade-free roof space, inverter sizing, and battery goals usually matter more than small angle differences.
Annual production by strategy
Monthly performance breakdown
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