Solar farm and renewables drone survey.
Land survey for solar, battery storage and grid infrastructure.
A renewables drone survey covers four distinct jobs: a solar farm topographic survey for yield modelling, panel layout and civil design; a cable corridor and BESS compound survey for the grid connection; radiometric thermal inspection of energised PV arrays; and close-range aerial inspection of wind turbines and towers. Angell Surveys Ltd is RICS-regulated, works UK-wide from London and Suffolk, and specifies every deliverable against the band table in RICS Measured surveys of land, buildings and utilities, 3rd edition (RICS, 2014).
What survey data does a solar or BESS development need, and when?
Three stages, three deliverables. Before planning, a topographic survey and terrain model of the candidate site drive yield modelling, panel layout, drainage strategy and the consent submissions. During construction, repeat aerial survey gives progress records, earthworks volumes and formation-level verification. After energisation, thermal inspection of the array and aerial inspection of the structures become the operational record. All three run off the same survey control network, so the datasets remain directly comparable across the life of the asset.
Solar farm and battery energy storage development begins with land. Accurate topographic survey of candidate sites gives developers and their design teams the terrain data needed for yield modelling, panel layout optimisation, drainage strategy and civil design — well before planning submission. Our UAV photogrammetric survey delivers sub-5cm DTM and orthomosaic across sites of any scale, with OSGB36 georeferencing and full survey control documentation suitable for planning authority and DNO submission. On a 250 ha solar farm and BESS site in Lincolnshire the same fixed-wing LiDAR and photogrammetry dataset served the DCO application, the drainage consent, the grid connection offer and the BNG baseline survey.
For battery energy storage system (BESS) developments and grid connection infrastructure, we provide topographic survey of compound sites, access route corridors and substation plots alongside LiDAR capture of existing structures and overhead line infrastructure. Cable corridor survey and volumetric analysis supports detailed design of trenching works, ducting routes and compound grading — reducing the risk of unforeseen ground conditions and programme overrun during construction.
Throughout the construction phase, repeat aerial survey provides progress records, earthworks monitoring and as-built terrain verification. Final as-built surveys document the completed site — including panel array extents, drainage swales, access tracks and compound infrastructure — providing the landowner, developer and grid operator with an accurate spatial record from the point of energisation onwards.
How is a solar PV panel inspected by drone?
By radiometric aerial thermography flown over the array while it is under load. A long-wave infrared camera records temperature-true imagery of every module, and the thermal and daylight frames are paired and georeferenced so each fault carries a module-level coordinate. A bypass-diode failure reads as a hot triangle across one substring; a failed module reads warm across the whole panel; a failed string fuse shows as a warm run. Interpretation follows IEC 62446-3 and is carried out by an ITC Category 2 thermographer against the recorded conditions on site.
What the survey finds
Hot cells, failed and partially shaded modules, bypass-diode failures, junction-box defects, string and fuse outages, and connector heating — reported by module and string so the operations team can target the component at fault rather than walk the array.
What makes it valid
Irradiance above 600 W/m², clear sky, arrays under load and a flight window around the middle of a bright day. Thin cloud, low sun or a damp array suppresses the temperature difference that the method depends on, so the survey is booked to the weather rather than the diary.
What you receive
An anomaly map with module-level coordinates, a defect inventory, paired thermal and visual imagery per anomaly, the environmental conditions and thermographer category recorded, and a severity-ranked remediation list. See the aerial thermal survey service for the full reporting standard.
Background reading: why a roof survey comes before a solar installation, and the complete guide to thermal imaging surveys, which sets out the conditions and standards in full.
What accuracy does a BESS compound survey need?
Tight enough that container platform levels and drainage falls can be designed straight off the survey. In practice that means a compound plan at 1:500 with cross-sections, over a terrain model at 5 cm resolution, specified and reported against the band table in RICS Measured surveys of land, buildings and utilities, 3rd edition (RICS, 2014), with the band agreed at briefing and the residuals against independent check points stated on issue.
What it is designed against
Ground-bearing capacity assessment, battery container platform levelling, compound grading and drainage falls, and the fire separation distances required under BS EN IEC 62933 and the site fire safety strategy.
The grid connection
Cable corridor levels, cross-sections and the terrain model for the route between the onsite substation and the point of connection, with existing overhead line infrastructure captured by aerial LiDAR survey for clearance and wayleave work.
Worked example
On a 250 ha solar farm and BESS site in Lincolnshire a single fixed-wing LiDAR and photogrammetry sortie produced the 5 cm DTM, 3 cm orthomosaic and 1:500 compound sections used for the DCO application, the drainage consent and the 33 kV connection offer.
Can a drone inspect wind turbine blades?
Yes, for external surfaces. With the turbine parked and locked out, close-range UAV imagery records each blade face, the tower, the nacelle exterior and the hub at a resolution that resolves leading-edge erosion, coating loss, lightning-strike damage, surface cracking and bond-line defects — each item entered in a georeferenced defect register with its imagery attached. It removes the rope-access or platform mobilisation for the inspection itself. It does not replace internal blade inspection of spar caps and shear webs, which needs access from inside the blade, and it is evidence for the engineer rather than structural sign-off.
What is recorded
Blade surfaces front and back, tower shell and welds, nacelle exterior, hub and spinner, transition piece and, where relevant, the foundation and hardstanding. Thermal capture can be added where delamination or water ingress is suspected.
Where the limits are
Blade internals, anything requiring touch — coating thickness, hammer testing, bolt torque — and operation in high wind. Capture is planned to a wind and light window, with the turbine shut down and positioned by the operator.
How it is delivered
Through our aerial drone inspection service: a defect register ranked by severity, imagery against every item, and a repeat-survey baseline so the next inspection is directly comparable with this one.
Background reading: drone surveying and LiDAR for wind turbine inspections.
Which survey methods suit solar, storage and grid assets?
The geospatial services we deploy across solar, battery storage and grid infrastructure development. Once an array is energised, an aerial thermal survey locates bypass-diode faults, hot cells and string outages across a whole site from the air.
Solar, storage and wind survey questions.
What survey does a solar farm need before construction?
How is a solar PV panel inspected by drone?
What accuracy does a BESS compound survey need?
Can a drone inspect wind turbine blades?
Does a solar farm survey cover the grid connection route?
Bring engineering precision to your next project.
Most scoping responses sent within one business day.
RICS-regulated work, led by Philip M. Angell MRICS.