They claim 400 watts for the frunk in the latest T-Sportsline video.
(400 watts) / (48 volts) = 8.3 amperes
T Sportline: "Confirmed with Tesla, both [roof | frunk] auxiliary power taps are rated to 400 watts. Both are protected with solid state circuits, if you exceed 400w, they shut off."
Title: Dissecting a Cybertruck Part 2! Tesla Auxiliary Power Under Frunk, Inspection & More, first look
7:26
(400 watts) / (48 volts) = 8.3 amperes
T Sportline: "Confirmed with Tesla, both [roof | frunk] auxiliary power taps are rated to 400 watts. Both are protected with solid state circuits, if you exceed 400w, they shut off."
Title: Dissecting a Cybertruck Part 2! Tesla Auxiliary Power Under Frunk, Inspection & More, first look
7:26