This guide assembles commercial components rather than designing a homemade battery or underwater powertrain.
This guide assembles commercial components rather than designing a homemade battery or underwater powertrain. Design value: fit a compatible assist low on the mast, with maker-approved clearances, cable routing and controls. A complete eFoil is a different integrated product.
The sizing example is a rider of 193 cm and 87 kg.
The sizing example is a rider of 193 cm and 87 kg. Design values: roughly 110–125 L board volume is a starting range to try, not a stability guarantee. Budget uses a candidate 2,100 cm² foil and a used 112 L board; Solid uses a branded foil package and a new board whose local price remains open.
Maker-stated quote: by email to the factory, November 2026, C-foil states 20–25 min per requested 480 Wh pack for this 87 kg example and 2,100 cm² wing.
Maker-stated quote: by email to the factory, November 2026, C-foil states 20–25 min per requested 480 Wh pack for this 87 kg example and 2,100 cm² wing. Battery labels, thrust and rider-limit statements still conflict. Two packs are intended for sequential sessions, not parallel wiring.
Dealer quote, November 2026: approximately 45 min for MAX+ is an estimate.
Dealer quote, November 2026: approximately 45 min for MAX+ is an estimate. Foil Drive states 648 Wh at 43.2 V, 2,150 W peak and 1,750 W sustained. No written maker runtime for this exact low-mount assembly is established. At 1,750 W, 648 Wh gives about 22.2 ideal minutes before losses and reserve; that is a design calculation.
Design value: allow 6–10 h for inspection, dry fitting, assembly and checks after compatibility is closed, excluding delivery, active charging, lessons and sea trials.
Design value: allow 6–10 h for inspection, dry fitting, assembly and checks after compatibility is closed, excluding delivery, active charging, lessons and sea trials. Required flotation, exact torque tools, mounting choices and landed costs remain open.