Best Angle for Solar Panels in the UK

TL;DR

• Face panels south where possible; aim for a fixed tilt around 30–40° in most of the UK.
• Flat roofs: use mounting frames to reach ~30–35°; avoid ballasting that shades rows.
• East/West roofs work well with split arrays; yield is ~10–20% lower than due south but spreads generation.
• Prioritise shade avoidance and safe fixing over chasing small angle gains.

Why tilt matters

A good tilt aligns the panel with the sun's average path, lifting annual yield and keeping rain run‑off effective. Small angle differences (e.g. 30° vs 35°) change yield far less than shading, orientation, or inverter limits.

The UK sweet spot (and East Sussex specifics)

• Typical fixed tilt: 30–40° across England; 35° is a robust default.
• Orientation: due south is best; south‑east/south‑west are close behind.
• Latitude fine‑tuning gains are usually marginal for homes. Focus on shading and clean cable runs instead.

Pitched roofs

• Most pitched roofs in the South East sit between 30–45°. If your roof pitch is within that range and faces south-ish, follow the roof—no special brackets needed.
• If the pitch is shallow but shading is minimal, accept the pitch. The simplicity often beats small performance upsides from complex mounts.

Flat roofs

• Use A‑frames or low‑tilt systems (aiming ~30–35°). Keep sufficient row spacing to prevent inter‑row shading, especially in winter.
• Consider wind loading, ballast, and waterproofing. A structural check is essential.

East/West split arrays

• Where south is unavailable, split strings (east and west). Morning + afternoon generation flattens the curve—handy for self‑consumption.
• Expect slightly lower annual yield than south, but often better alignment with household demand.

Shade and obstructions

• Chimneys, dormers, trees and neighbour roofs are bigger yield killers than a few degrees of tilt. If in doubt, move or remove a panel.
• Use optimisers or parallel strings only when shade can't be designed out.

Ground or wall mounting

• Ground mounts: easy to set optimal tilt and keep panels clean; allow 30–35° and space for maintenance.
• Wall mounts: choose a strong, south‑facing wall; ensure fixings and weatherproofed routing are sound.

Quick checks before you commit

• Do I have clear southern sky for most of the day?
• Any seasonal shade (winter sun is low)?
• Can mounting and cable routes be kept simple and secure?

Bottom line

Pick a sensible fixed angle (~35°), avoid shade, keep runs tidy, and match array layout to your roof. That combination outperforms micro‑optimising tilt in almost every home install.