12vdc 80w PWM transistor?

Starting/stall current is usually many times higher than rated current. Measure the resistance between the terminals
to calculate starting current. I = V/R

I'd suggest using a suitable low-resistance MOSFET (depends on the stall current what's suitable)
driven from a MOSFET gate driver chip such as MIC4422 (many many are available, you just need a
low-side driver).