How much does a warehouse roof in Canton generate?

The model gives 936 kWh for every kWp installed here, so 500 kWp comes out at about 468,000 kWh a year before any shading losses. You need roughly 1,485 sqm of clear roof to fit it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Does the grid around Canton have capacity?

National Grid Electricity Distribution is the distribution network operator for Cardiff. Anything above 3.68 kW per phase connects under G99, and the application sets the export limit. We submit it as part of the design.

Solar panels for warehouses in Canton

Roof space is the one asset a Canton unit already owns and rarely uses. We start with the covering and the structure, because a roof with five years left in it changes the answer entirely.

936 kWh per kWp a year at this latitude, so a 500 kWp array models at about 468,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Canton

Drawing Canton unit

Roof 96 x 62 m

Array 500 kWp

Yield 468,000 kWh/yr

Scale 1:500 / Rev A / Cardiff

Illustrative layout for a unit of this size. Your own figures come from the roof survey.

Canton / Cardiff

Aerial view of an industrial estate where some warehouse roofs carry solar arrays and others are bare steel — Industrial stock of the kind we survey across Cardiff.

Warehouse rooftop solar across Cardiff

What a roof in Canton actually generates

Modelled irradiation at this latitude is 1193 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 936 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 6 percent above the mean across the towns we cover, which is as good as UK rooftop gets outside the south coast.

FIG. 1 What a Canton roof makes, month by month

Jun produces 6.3 times what Dec does on the same roof. A 500 kWp array here models at about 468,000 kWh across the year, but it arrives unevenly, which is why we size against your summer daytime load and then look at whether storage is worth adding for the shoulder months.

Monthly figures as a table

Month	kWh per kWp	500 kWp array
Jan	24	12,000
Feb	41	20,500
Mar	76	38,000
Apr	110	55,000
May	130	65,000
Jun	132	66,000
Jul	130	65,000
Aug	108	54,000
Sep	85	42,500
Oct	50	25,000
Nov	30	15,000
Dec	21	10,500

Source: EU PVGIS v5.2

FIG. 2 Canton against the rest of Cardiff

Canton936
Pontcanna936
Cathays908
Splott908

Canton ranks 1 of 4 towns we cover in Cardiff on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 908 to 936, a spread of 28 kWh per kWp. Within Cardiff that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.

Bars are zero based, so length is proportional to the figure. Where a county is flat, that is the finding: location is not the lever, consumption is. Source: EU PVGIS v5.2, modelled per town

Grid connection through National Grid Electricity Distribution

National Grid Electricity Distribution operates the distribution network across Cardiff, so the export application goes to them. Anything larger than 3.68 kW per phase falls under G99, which means an application before commissioning rather than a notification afterwards. A constrained network is not the end of a scheme. Capping export costs little when the building already absorbs most of what the roof produces.

Book the survey

Send us the postcode

Tell us where the unit is and roughly how big the roof is. We come back with what it can carry, what it would generate against your consumption, and the three ways to pay for it.

Lenzie Consulting Ltd arranges the survey and passes your details to our MCS-certified installation partner so they can quote.

Questions about solar in Canton

How much does a warehouse roof in Canton generate?: The model gives 936 kWh for every kWp installed here, so 500 kWp comes out at about 468,000 kWh a year before any shading losses. You need roughly 1,485 sqm of clear roof to fit it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Does the grid around Canton have capacity?: National Grid Electricity Distribution is the distribution network operator for Cardiff. Anything above 3.68 kW per phase connects under G99, and the application sets the export limit. We submit it as part of the design.