Depot solar built around fleet electrification

Distribution operations rarely keep office hours. Picking, sortation, inbound and outbound shifts, chilled areas and dock activity often run around the clock, or at least well into the night and across weekends. Compared with a general warehouse, that is a much better fit for generation.

It means self consumption is high without any special effort. Conveyors, sortation, compressors, dock levellers, lighting and battery charging for materials handling equipment all draw through the day, so daytime output is absorbed rather than exported.

Materials handling charging deserves a specific mention. Forklift and powered pallet truck charging is a substantial, controllable load that has traditionally been done overnight out of habit rather than necessity, and moving some of it into the generating window is one of the cheapest self consumption improvements available on a depot.

A depot roof was always a reasonable solar candidate. What transforms the case is vehicle charging. An electrified van fleet, and more so an electrified truck fleet, has an energy appetite that dwarfs the building it parks beside, and it turns a site with a comfortable supply into one that is capacity constrained.

That is a different project from a rooftop array, and it is a mistake to treat them separately. Groundworks, switchgear, cable routes, metering and the connection application are shared, and doing them once is materially cheaper than doing them twice.

It is also the point at which on site generation stops being a cost saving measure and starts being part of how the site gets enough power at all.

The awkward truth is that vans usually return in the evening and charge overnight, precisely when an array produces nothing. Any proposal claiming a fleet is solar powered on that pattern is not being straight with you.

What actually closes the gap is a combination: cheap overnight import on a time of use contract, storage charged during the day and discharged into the evening charging session, and opportunity charging while vehicles dwell at the dock during daylight. Trunking and shuttle operations with daytime turnaround can charge directly from generation and do very well.

Refrigerated vehicles are the clearest daytime win. Shore power for trailers and reefers at the dock is a significant load that occurs while the sun is up, and it aligns with generation almost perfectly.

Depot electrification is limited by the incoming supply far more often than by roof area or by budget. Once measured peak demand is compared with agreed capacity, the number of chargers a site can naively support is often disappointingly small.

Dynamic load management changes that. By sequencing and throttling charge points against real time site demand, a depot can typically support several times more connected points than a simple sum of their rated outputs would allow, because vehicles rarely all need full power at once.

Generation and storage extend it further, shaving the peak that would otherwise trigger a reinforcement application. That matters commercially, because a network reinforcement can carry both a large cost and a lead time measured in years, and deferring it is often worth more than the energy saving itself.

Distribution roofs are large, clear and modern on most units, which makes them straightforward. The usual constraints are rooflights reducing usable area, structural headroom on lightweight portal frames, and sprinkler and smoke ventilation zones that the layout must respect.

Where the operator leases the unit, lease term against a twenty five year asset becomes the deciding question, and a landlord conversation is needed early. Third party funded structures and landlord funded schemes both appear in this sector for that reason.

NRG Solar assesses and matches. We produce indicative figures from your own consumption, roof outline and charging plans, then introduce one vetted installer working in your region with depot and charging experience. We do not install, the service is free to you, and the installer pays us only if the project goes ahead.