While the term “built-in inverter” can sometimes refer to micro-inverters directly on the back of individual panels, this article focuses on comprehensive solar solutions where the inverter is a core, integrated component of the system or portable power unit. . That's precisely what solar panels with built-in inverters offer – a revolutionary step towards simpler, more accessible renewable energy. About. . An inverter is one of the most important pieces of equipment in a solar energy system. It's a device that converts direct current (DC) electricity, which is what a solar panel generates, to alternating current (AC) electricity, which the electrical grid uses.