Compass reality in British streets
Maps pretend houses align neatly; real streets zigzag. Your “north” elevation might catch generous east/west wash light depending on roof pitch and neighbouring heights — or be shadow-bucketed permanently by a Victorian monster three doors down.
How hard north tilts the curve
True north-facing arrays in the UK often lose a large double-digit percentage versus optimal south — exact hit needs simulation. Sometimes designers propose split east/west strings if those planes exist.
Split arrays and hybrid fixes
Micro-inverters or optimisers can reduce string mismatch when planes aim different directions — capital rises, but so can harvest diversity across daytime hours.
When ground or garage beats the house
Detached garages with decent aspect sometimes beat main roof north face. Ground mounts exist but planning and fencing add friction — still worth listing if roof economics collapse.
The honest “maybe not” conversation
If simulation says payback beyond your mortgage horizon and you hate maintenance thoughts, skipping solar is rational. Money saved can fund fabric efficiency that raises comfort regardless of weather.
Sometimes a smaller trial array or shared project bridges curiosity without maxing borrowing — ask designers if phased approaches exist without silly premiums.
Dormers and chimneys as petty tyrants
North arrays often sit near ridge fixtures casting midday shadows you only notice in software cross-sections. Walk the roofline mentally with winter sun angles — if a dormer eats an hour of production daily, payback maths notices even when aesthetics whisper “it will be fine.”
East-west lifelines on semis
Many semis give usable east and west facets even when the street-facing elevation is north. Designers sometimes split strings across planes so you harvest morning and afternoon shoulders — you will not match perfect south, but you might beat bitter export-only tariffs if self-consumption aligns.
Flat roof tilt mounts — planning and ballast
Tilting on flat rubber can work brilliantly — ballast blocks, wind calculations and planning scrutiny increase. If main pitched planes face north, a discreet rear flat section may rescue economics — but verify structural loading before romanticising angles.
When the honest answer is hedge elsewhere
If modelling clears under a decade only under heroic export rates you cannot actually obtain, redirect capital to loft insulation or tariff optimisation first. Solar FOMO will still exist next year; fake breakeven will not.
Garage or outbuilding planes sometimes face south while the house sulks north — survey sketches should include every useful rectangle.
Don’t let July praise blind you to December math
North-heavy designs sometimes harvest “respectable” summer totals that collapse in shoulder seasons — insist on full-year charts before signing. Beautiful July arcs are how mid-life crises start for spreadsheets.
Simulation outputs you should demand in writing
Monthly generation tables, shade object list, and assumptions on soiling should arrive as more than a glossy annual kWh integer — ask which software build and which weather dataset underpins numbers. If north-heavy designs still “look fine,” insist on July vs December side-by-side bars until intuition matches graphics.
Sometimes a small east/west slice salvages respectability where pure north fails — celebrate pragmatic designers who surrender ego for physics.
If numbers stay anaemic after honest modelling, praise yourself for discovering it pre-deposit — many impulse buyers skip that homework and host expensive roof decorations.
Albedo, light clouds and hope
Light cloud cover can produce surprising diffuse harvest — north-heavy arrays occasionally enjoy “better than feared” spring weeks. Enjoy without extrapolating fairy tales across winter receipts.
Bright white neighbour walls even help weak orientations marginally — mention obstructions and reflectors when modelling nerds compile inputs.
Batteries as partial bandages, not magicians
Batteries cannot steal sun that never arrived — if north yield is anaemic, storage mainly time-shifts grid imports rather than manufacturing daylight miracles. Model accordingly before expensive hardware.
When lidar lies politely
Fresh builds, removed trees, or new extensions alter reality faster than databases refresh — mention every recent change at survey verbally and in email recap.
Sometimes garage roofs offer honest south while houses sulk north — walk the full property before accepting house-only thinking.
If hybrid east/west strings confuse you, ask for production clock-wheel graphics — intuition catches up faster with circular sunrise/sunset metaphors than tables alone.
Microclimates along the same postcode
River valleys, coastal haar, and urban heat islands nibble yields differently even within miles — trust site-specific models more than “my colleague in your county” hand-waving.
If modelling suggests borderline economics, test conservative self-consumption assumptions aggressively — optimism belongs in birthday cards, not fuse boxes.