Partners from Niger came to the factory with a familiar problem. Their rural road programme had a fixed budget per kilometre, and the first draft design called for a wattage that would have consumed the entire budget on hardware alone.

The Problem

Rural roads are the hardest case for solar lighting. Distances are long, the grid is absent, maintenance crews are far away, and the rainy season can deliver several consecutive grey days. Specifying a bigger lamp looks like a simple fix, but it raises panel size, battery capacity, pole strength and freight cost at the same time.

What We Checked Together

We went through their site data on the sample table and rebuilt the lighting plan from the road upwards.

1. Road width and use: a single lane used by motorcycles and pedestrians needs a different distribution from a two-lane truck route.
2. Pole height: raising the pole spreads light further but reduces illuminance on the surface. Most rural roads are better served at 6-8 metres than at 10.
3. Spacing: tightening spacing by five metres often costs less than increasing wattage by 30W, and it produces more even light.
4. Rainy-season margin: we sized the battery for three consecutive low-sun days rather than the annual average.

What the Pilot Will Measure

Before scaling to the full programme, the partners will run one kilometre of road for a complete rainy season. The pilot is designed to answer four questions that no catalogue can settle: whether the chosen wattage produces even light on that specific surface, whether the battery margin holds through consecutive grey days, whether the local crew can install a pole without supervision, and whether the community reports any dark stretches.

We supplied a simple log sheet for the crew to record sunrise switch-off time, any fault codes and the cleaning interval. That data will decide the final specification for the remaining kilometres, and it costs far less than discovering the problem after a full rollout.

The Result

By stepping down one wattage class and reducing spacing slightly, the design kept the same average illuminance while cutting panel and battery size. That saving paid for additional poles at intersections, which is where lighting actually affects safety.

The team left with a revised bill of quantities and a plan to test one kilometre before scaling. We will support that pilot with installation drawings and a maintenance checklist for the local crew.

If your rural programme is stuck between budget and brightness, send us the road data. The answer is usually geometry, not more watts.