Capacitors for Power Tech Generators. Although most Power Tech generators require voltage regulators, there are some generators that use capacitors to regulate the voltage. The Power Tech 3 KW Sprinter Van Generator and the 5 KW APU Truck Generator are two models that require a capacitor instead of a voltage regulator. Also listed in this category are the capacitors for remote fans. The list below are all the capacitors available from Power Technology Mobile Generators.