# GCL System Integration NT12R/54GDF 515 W P-185 ![GCL System Integration NT12R/54GDF 515 W](/images/panels/gcl-system-integration-nt12r-54gdf-500.jpg) Sold by [Kilowatts Shop](/shop/kilowatts-uk/) NT12R/54GDF 515 W: 515 W module technology solar panel at 23.15% efficiency for commercial and mixed-use roofs. Check roof area, orientation, shading and the installed system design before ordering. RRP inc VAT £83.95 Price on application SKU: P-185 Available on backorder This product is out of stock. It cannot be ordered until it is available again. ## Choose options Pick an option to see price and stock. RRP inc VAT: **£83.95** · **Available on backorder** · Out of stock That combination is not available. Qty ## Get an installation quote Have this specified, supplied and installed by a vetted installer. [Returns policy](/shop/kilowatts-uk/returns/) · [Back to shop](/shop/kilowatts-uk/) [ Download datasheet ](/images/panels/sheets/gcl-system-integration-nt12r-54gdf-500.pdf) ## NT12R/54GDF 515 W The NT12R/54GDF 515 W is a GCL System Integration module for commercial and mixed-use roofs. Its headline output is **515 W** with a listed module efficiency of **23.15%**. Use this page as a practical starting point for comparing generation, roof space, installation constraints and whole-system value; the panel alone does not determine the annual yield of an array. ### Specification at a glance ManufacturerGCL System IntegrationModel / item codeNT12R/54GDF-515Panel technologymodule technologyPower output515 WModule efficiency23.15%Cell countNot statedFinishstandard frame finishDimensions (W × H × D)1134 mm × 1962 mm × 30 mmWeightNot statedManufacturing originNot stated in the catalogueListed degradation / durabilityNot stated in the catalogue ### What the figures mean The wattage is the panel’s rated output under standard test conditions, while efficiency describes how much of the available sunlight is converted within the module area. Higher efficiency can be useful where roof space is limited, but the best choice also depends on price, inverter sizing, cable runs, roof loading, access and the expected generation profile. Actual UK production varies with orientation, pitch, shading, temperature, soiling and clipping. ### Roof planning and installation Before specifying this module, measure the usable roof area rather than the overall roof. Allow room for edge clearances, access, mounting rails, cable routing and any roof windows or vents. The listed dimensions and weight should be checked against the installer’s structural assessment and lifting plan. Confirm that the proposed inverter, optimisers, isolators and protection equipment accept the panel’s electrical range; do not select a panel from wattage alone. For a residential roof, compare the module footprint with the number of panels needed. For commercial or industrial work, also consider wind exposure, loading zones, maintenance walkways and future access. ### Performance and value A panel with a strong nameplate rating can reduce the number of modules required for a target system size, but yield is a system-level result. Ask for an annual generation estimate based on the site postcode, roof orientation and shading survey. Compare like-for-like quotations that identify the exact module, inverter, mounting system, monitoring, commissioning and warranty terms. A slightly lower-wattage module may offer better value if it fits the roof more efficiently or avoids an expensive structural alteration. ### What to confirm before ordering - Exact model and item code match the quotation and datasheet. - Panel dimensions, weight and finish suit the roof and planning requirements. - Electrical compatibility is confirmed with the chosen inverter and string design. - Warranty, degradation wording and installation workmanship cover are supplied in writing. - Delivery, storage, lifting and replacement-panel arrangements are included in the project plan. [View the available manufacturer or datasheet information](/images/panels/sheets/gcl-system-integration-nt12r-54gdf-500.pdf). Specifications can change between production batches, so the installer should verify the current document before final design. ### Is this panel right for your project? NT12R/54GDF 515 W may suit a commercial installation where its output, efficiency and physical format align with the roof and system design. Request a site-specific quote to check yield, string voltage, mounting, grid requirements and the installed price before committing. ## Specifications NameNT12R/54GDF 515 WManufacturerGCL System IntegrationWattage515 WEfficiency23.15%Cells0Width1134Height1962Weight0 Shop ## Shop [![DAS Solar DAS-DH108NE 515W](/images/panels/das-solar-das-dh108ne-500.jpg) £83.95DAS Solar DAS-DH108NE 515W View product](/shop/kilowatts-uk/panel-das-solar-das-dh108ne-515-113/)[![Sungrow SG-48TG4D 480 W](/images/panels/sungrow-sg-48tg4d-480.jpg) £78.24Sungrow SG-48TG4D 480 W View product](/shop/kilowatts-uk/panel-sungrow-sg-48tg4d-480/)[![DAS Solar DAS-DH108NE 500W](/images/panels/das-solar-das-dh108ne-500.jpg) £81.50DAS Solar DAS-DH108NE 500W View product](/shop/kilowatts-uk/panel-das-solar-das-dh108ne-500-110/)