Devices regain Power Points just like a character, at the rate of one point per hour. Recharging may represent the device being plugged into an outlet, gathering solar rays, or even fritzing out for a while until it miraculously just starts working again. Regardless of the description, however, it regains Power Points at the rate of one per hour just like other power types. The Power Edges Rapid Recharge and Improved Rapid Recharge apply to all of the inventor's devices rather than the inventor himself.

Savage Worlds Deluxe Edition p. 120