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Kickr Core won't provide any resistance without power.
As a solution, buy a 12v motorcycle battery and suitable connector cable:
https://www.ebay.co.uk/itm/361074035399
https://www.ebay.co.uk/itm/LONG-4mm-Male-Banana-Plugs-Connectors-to-DC-Plug-2-5mm-Futaba-Cable-Lead/202482491148?You'll need a battery charger too: https://www.ebay.co.uk/itm/OXFORD-900-ANNIVERSARY-OXIMISER-UK-BATTERY-CHARGER-MOTORCYCLE-OPTIMISER/322670322457
Faff, but not too complicated. Keep battery charged as the Kickr power readings can drift if battery voltage drops too low.
Bigger battery = more runtime. The one I linked above is fine for 4-5 hours of turboing.
Thanks all, have click and collected one for the weekend.