https://cavlab.co.uk/ Engineering, tested and explained. en Sun, 08 Nov 2026 14:12:39 GMT https://cavlab.co.uk/splash-frost-false-alarms-winter-ip-rated-garden-sensors/ https://cavlab.co.uk/splash-frost-false-alarms-winter-ip-rated-garden-sensors/ Five outdoor smart sensors, one British winter and a set of IP ratings that promised more than they could deliver. We compare claimed ingress protection with condensation, cold batteries and the realities of a wet garden. CavLab Hardware & Standards Sun, 08 Nov 2026 12:11:20 GMT https://cavlab.co.uk/load-heat-paperwork-measuring-7-4-kw-ev-charger-legacy-consumer-unit/ https://cavlab.co.uk/load-heat-paperwork-measuring-7-4-kw-ev-charger-legacy-consumer-unit/ A 7.4 kW charger is a 32 A load that runs for hours, not minutes. We instrumented one on an older consumer unit to see where thermal behaviour, voltage drop and diversity diverge from the installation paperwork. CavLab Energy & Retrofit Sun, 08 Nov 2026 12:11:20 GMT https://cavlab.co.uk/listening-at-the-router-smart-home-traffic-week/ https://cavlab.co.uk/listening-at-the-router-smart-home-traffic-week/ Smart thermostats and hubs promise convenience, but their network behaviour is rarely examined. Using a mirrored WAN port and local DNS logging, we mapped a week of traffic from common UK smart-home devices and tested how much control survives without the cloud. CavLab Hardware & Standards Sun, 08 Nov 2026 08:10:53 GMT https://cavlab.co.uk/eight-hundred-watts-one-grey-season-balcony-pv-kit/ https://cavlab.co.uk/eight-hundred-watts-one-grey-season-balcony-pv-kit/ Plug-in solar kits are being discussed as a simple route to domestic generation, but a British winter is a stern test. We instrumented an 800 W balcony kit for six months, logging yield, inverter behaviour and the arithmetic behind payback. CavLab Energy & Retrofit Sun, 08 Nov 2026 08:10:53 GMT https://cavlab.co.uk/lorawan-allotment-soil-sensors-solar-gateway-season/ https://cavlab.co.uk/lorawan-allotment-soil-sensors-solar-gateway-season/ Eight soil-moisture nodes, one solar-powered gateway and a Grafana dashboard, run across the 2026 growing season on a UK allotment site. Here is what the radio link, the batteries, the enclosures and the data actually did when the weather stopped cooperating. CavLab Hardware & Standards Sun, 08 Nov 2026 04:11:56 GMT https://cavlab.co.uk/smart-kettles-calibrated-energy-meter-bench-test/ https://cavlab.co.uk/smart-kettles-calibrated-energy-meter-bench-test/ Four connected kettles, one dumb control and a calibrated power analyser: we measured real energy-to-boil, idle radio draw, keep-warm costs and whether a 70 °C setting actually reaches 70 °C. Some features earn their Wi-Fi. Most do not. CavLab Energy & Retrofit Sun, 08 Nov 2026 04:11:56 GMT https://cavlab.co.uk/counting-kilowatt-hours-twice-smets2-meter-calibrated-logger/ https://cavlab.co.uk/counting-kilowatt-hours-twice-smets2-meter-calibrated-logger/ A SMETS2 electricity meter, its in-home display and a calibrated energy logger were logged side by side for 30 days. Daily totals agreed closely, but tariff boundaries and display rounding showed where a time-of-use household can misread its own data. CavLab Energy & Retrofit Sun, 08 Nov 2026 00:12:07 GMT https://cavlab.co.uk/contention-at-teatime-full-fibre-throughput-latency-loss-uk-home/ https://cavlab.co.uk/contention-at-teatime-full-fibre-throughput-latency-loss-uk-home/ A 900 Mbps full-fibre service was instrumented for 30 days to separate access-line performance from Wi-Fi and home-network effects. Wired throughput held close to the advertised median at peak, but latency and the tenth percentile told a more honest evening story. CavLab Hardware & Standards Sun, 08 Nov 2026 00:12:07 GMT https://cavlab.co.uk/where-the-watts-sleep-standby-audit-british-home/ https://cavlab.co.uk/where-the-watts-sleep-standby-audit-british-home/ A week with plug-in monitors and a whole-house logger in a Sheffield semi quantifies what stays awake when the house is quiet. The always-on floor is larger than most smart-home advice assumes, and much of it cannot sensibly be switched off at all. CavLab Energy & Retrofit Sat, 07 Nov 2026 20:12:22 GMT https://cavlab.co.uk/bench-versus-tarmac-uk-e-bike-battery-audit-2026/ https://cavlab.co.uk/bench-versus-tarmac-uk-e-bike-battery-audit-2026/ CavLab put four UK-market e-bike packs through a controlled discharge and charger test regime, then rode a fixed Pennine loop to see how bench watt-hours translate into real miles. The gap between nameplate capacity, usable energy and advertised range turns out to be engineering, not marketing alone. CavLab Hardware & Standards Sat, 07 Nov 2026 20:12:21 GMT https://cavlab.co.uk/uk-plug-bs-1363-teardown/ https://cavlab.co.uk/uk-plug-bs-1363-teardown/ The UK three-pin plug is heavier, bulkier and more expensive than almost any rival — and it is still the safest domestic mains connector in common use. We dismantled one, traced the design decisions behind BS 1363, and asked whether a standard written for post-war copper shortages still fits a home full of EV chargers and heat pumps. CavLab Hardware & Standards Sat, 07 Nov 2026 16:12:32 GMT https://cavlab.co.uk/victorian-terrace-heat-pump-test-rig/ https://cavlab.co.uk/victorian-terrace-heat-pump-test-rig/ Solid walls, suspended timber floors and a bay window: the pre-1919 terrace is the hardest test in British retrofit. We built an instrumented rig to model one, ran it across a range of flow temperatures, and compared the measured results with the figures printed in manufacturer literature. CavLab Energy & Retrofit Sat, 07 Nov 2026 16:12:32 GMT