A light switch is the simplest of electrical devices. Flip the switch, electricity flows. Flip it again, electricity stops. Lights on, lights off. That’s great for a small room with one entrance.

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We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Liam McCabe A previous version of this article claimed that the Square D QO ...

Solar panels can only generate electricity; they can’t store it, so you must pair them with a stand-alone battery bank or a power station. For home emergency power (for a few hours of power), we ...