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Commercial production and sales were still being assessed, and no UK installer, warranty or product listing is identified. Cycle life, pack energy density and a temperature window were not published, so the outing is not a procurement specification. A completed cruise should be kept separate from a product that is ready to specify." } }, { "@type": "Question", "name": "Did the drone fly for nearly two hours on sunlight alone?", "acceptedAnswer": { "@type": "Answer", "text": "No. Pegasus completed an almost two-hour, 75 kilometre flight on one lithium-sulphur pack, with flexible perovskite cells also fitted. The pack, management system, power electronics and solar array are reported to have operated together, but the split between battery energy and solar energy was not published. Solar-assisted does not mean the aircraft flew on sunlight alone. 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The percentage should not be rewritten as 80 per cent more range in service." } }, { "@type": "Question", "name": "Is about 347 watt-hours per kilogram the rating of the battery that flew?", "acceptedAnswer": { "@type": "Answer", "text": "No. The company stated the cells on that flight at 382 watt-hours and 1.1 kilograms, and dividing those figures gives about 347 watt-hours per kilogram. That is arithmetic on stated cell numbers, not an independent test, and it is not the energy density of the installed pack. Housing, connectors, protection, the management system and any heating or cooling still have to be carried, and pack mass was not published. Power in kilowatts was not published either." } }, { "@type": "Question", "name": "Could this aircraft cut the cost of inspecting UK solar farms or other energy sites?", "acceptedAnswer": { "@type": "Answer", "text": "Not on this evidence. A longer cruise might later reduce launches on a large or linear site, but only if it were shown to be repeatable and lawful to fly here, and a 75 kilometre transit in Australia does not establish fewer visits or a lower cost. Payload, wind limit, downlink and time on the asset were not stated, and a fixed-wing cruise is a poor match for hovering beside a turbine blade. Unmanned aircraft in the UK are regulated by the Civil Aviation Authority, and a flight of this length is not routine visual-line-of-sight work." } }, { "@type": "Question", "name": "Does the announcement change UK solar grants, MCS certification or grid connection?", "acceptedAnswer": { "@type": "Answer", "text": "No. The source identifies no UK grant, installer, warranty or product listing, and no cost, payback or subsidy should be inferred. MCS certification and distribution-network connection rules do not govern this aircraft. This article is not a statement of aviation law. 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Two patent applications do not close that gap: an application is not a granted patent and not a UK right." } } ], "about": { "@id": "https://kilowatts.uk/resources/yesterday-uk/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/resources/yesterday-uk/#webpage", "url": "https://kilowatts.uk/resources/yesterday-uk/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/resources/yesterday-uk.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/resources/yesterday-uk.schema" } ], "name": "Lithium-Sulphur Battery and Perovskite Solar Drone Completes Two-Hour Flight", "headline": "Lithium-Sulphur Battery and Perovskite Solar Drone Completes Two-Hour Flight", "description": "A lithium-sulphur battery drone with perovskite solar cells flew almost two hours. 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