Solar Bus Shelter Lighting
-- Design Specs and Site Criteria
Solar Bus Shelter Lighting: Design Specs and Site Criteria
A solar bus shelter is street furniture with a power budget. The roof area sets the ceiling on generation, the passenger load list sets the floor on consumption, and the battery is whatever survives between the two. Every design decision on this page — panel layout, dimming strategy, battery placement — follows from that budget. What the original version of this page never says is the budget itself, so we start there.
What the system includes
A shelter system in our range has five scopes: the PV canopy (custom-sized panels matched to the shelter's roof dimensions, with flexible configurations for flat, single-slope, and curved roof designs), LED lighting, a battery and charge-control compartment, the control system, and optional ancillaries such as USB charging ports or an information display. Semi-transparent panel options exist where the shelter also needs natural light underneath; color-matched frames exist where the transit authority's brand palette matters. Neither is standard, and neither should be assumed into a price without a reason.
The load math that drives the design
Motion-activated dimming is not a feature on a solar bus shelter — it is the condition that makes solar viable. A worked example, with the assumptions stated:
- Full-output lighting at 20 W LED for 12 hours of darkness = 240 Wh per night.
- With motion dimming, output drops to roughly 30% for the ~80% of the night when nobody is waiting: the same fixture consumes about 90–110 Wh per night.
- A 200 W panel at 3–4 effective peak-sun hours yields roughly 600–800 Wh per day.
Those numbers are calculated examples, not measurements — your latitude, roof orientation, and local sunshine hours move them — but the ratio they show is stable. A shelter lit at full output all night needs a panel area and battery that most shelter roofs cannot carry. A shelter with motion dimming fits comfortably. When a client insists on full-output lighting, we either upsize the array or recommend a grid feed; we do not ship a system that will be dark by 2 a.m. in December.
Typical specifications
Ranges are typical envelopes from our product practice, sized per project:
| Scope | Typical range | Notes |
|---|---|---|
| PV canopy | 100–400 W per shelter | Limited by roof area; custom-sized to shelter dimensions |
| LED lighting | 10–30 W per fixture, 1–2 fixtures | Motion dimming to ~30% baseline |
| Battery | 20–60 Ah LiFePO4 (lithium iron phosphate) at 12/24 V | Sized for 3–5 nights at dimmed load |
| USB charging | 5–10 W per port | A meaningful new load — add it to the budget before adding the port |
| Controller | MPPT with temperature-compensated charging | MPPT (maximum power point tracking) matters where panel voltage sits well above battery voltage |
Security design, stated plainly
Bus shelters attract three kinds of theft: panels, batteries, and copper cable. Our standard design answers each one directly. Panels mount on low-profile brackets with one-way security fasteners — a standard wrench will not free them. Batteries sit in a concealed compartment inside the shelter structure, in a tamper-proof housing with reinforced locks, ventilated so summer heat does not cook the pack. Cable runs are internal wherever possible and weatherproof-sealed at every connection point where they are not. Tamper-detection sensors and camera integration are options we quote when the site history justifies them; vibration-resistant mounting is standard because buses and vandalism both shake the structure.
Where a solar shelter fits — and where it does not
| Site condition | Verdict |
|---|---|
| Unshaded roof, sound shelter frame | Good fit — standard scope |
| Mature tree canopy or overpass overhead | Fix the shade first; a remote panel mount is possible but check cable voltage drop (shading guide) |
| Coastal or heavy-salt environment | Fits with a corrosion spec on frames and fasteners; quote it explicitly |
| High-vandalism district | Fits with the security package; budget for it rather than hoping |
| Snow or high-wind region | Structure needs a wind and snow load check before panels — use our wind load calculator for a first pass |
| Existing grid feed at the shelter, low tariffs | Often the wrong fit — a metered grid connection may cost less over 10 years than two battery replacements |
The honest economics
The real competitor to a solar shelter is not another solar shelter; it is a trenched grid connection. The comparison has two moving parts: the cost of trenching from the nearest supply point (which climbs with distance and with any paved surface in the way) and the battery replacement reserve (LiFePO4 packs in outdoor duty typically last 5–8 years depending on climate and cycling). We quote both sides. Any payback figure quoted without the trench route and the local labor rate is a guess, and we do not put guesses on paper.
What this page does not cover
This page covers standalone solar shelter systems for public transit stops. It does not cover grid-connected shelters with metered power and utility billing, high-load transit hubs where the load list exceeds what a shelter roof can serve, or advertising-lit shelters with large display loads — those need a different architecture. For hardware, see the all-in-one solar street light line, whose battery and controller scopes overlap directly.