The whole system in one sentence
A panel makes DC electricity, a microinverter converts it to household AC, and a normal plug feeds it into a circuit in your home — where anything currently switched on uses it before the grid.
Step by step
- The panel generates DC. Sunlight on the cells produces direct current, the same as any solar panel.
- The microinverter converts it. A small box, usually attached to the panel, turns that into AC matched to your grid’s voltage and frequency.
- It feeds your circuit. Plugged into an outlet, that power flows into the ring and is consumed by whatever is drawing.
- Your meter sees less demand. You are not selling power. You are simply buying less of it.
There is no battery and no switching. When the sun is out you buy less electricity. When it is not, everything runs from the grid exactly as before. Plug-in solar does not provide backup power — for that you want a power station.
What it offsets
Your background daytime load: fridge, router, standby draw, anything left on. One or two panels cover that and no more. It will not run a house and no honest seller claims otherwise.
Which is why it works best for someone at home during the day. If nobody is in from eight until six, the generation happens with nothing to consume it.
Anti-islanding
Every compliant microinverter shuts down within moments of losing grid power. That prevents it energising wires that a lineworker believes are dead. It is also why plug-in solar is useless in an outage — by design.
The legal question
This varies by state and utility and is genuinely the thing to settle first. Utah legalised small plug-in systems outright; elsewhere it turns on your utility’s interconnection rules. See plug-in solar for where the market stands.