Abstract: An apparatus includes a housing. The housing has an interface portion configured to complementarily fit with an interface portion of an appliance. The apparatus includes a communication interface configured to be removably coupled with the appliance. The apparatus includes a power interface configured to be removably coupled with the appliance. The apparatus includes a processor configured to identify an appliance type of the appliance based on appliance communications and generate a signal based on the appliance type. The apparatus includes an AC interface configured to be coupled with an AC grid. The apparatus includes a battery. The apparatus includes a multi-mode inverter configured to receive power from the AC grid and/or the battery and send power to the appliance, based on the signal. The communication interface, the power interface, the processor, the AC interface, the battery, and the multi-mode inverter are each at least partially disposed in the housing.

Abstract: A knob assembly for a coupled appliance includes a base static part and an actionable cap part, where the base static part includes a substrate base, a bearing holder fixed to the substrate base, a sleeve bearing fixed to the bearing holder, and a set of coupling magnets disclosed between the bearing holder and the substrate; the actionable cap part includes a covering cap, a rotor shaft attached to the covering cap, and a control magnet fastened to the rotor shaft. The knob assembly is capable of detachably attaching to a surface of the coupled appliance.