Plug-in solar FAQ
Short, sourced answers. If your question is not here, ask us and we will add it.
Questions
Is plug-in solar the same as balcony solar?
Yes. "Balcony solar" (Balkonkraftwerk) is the European name. In the US, laws and retailers mostly say "plug-in solar" or "portable solar systems."
Which US states allow plug-in solar?
As of late 2026: Utah, Maine, Virginia, Colorado, Maryland, Connecticut, New Hampshire, Vermont and New Jersey have enacted laws, California's takes effect January 1, 2027, and New York's is awaiting signature. See the state map for details and dates.
Do I have to ask my utility?
In states with a plug-in law, qualifying certified kits are exempt from interconnection applications. Everywhere else, assume yes: plugging in a grid-tie inverter without approval can breach your service agreement.
Is it safe?
Certified kits are designed to be. The inverter shuts off when the grid goes down and limits output so your wiring is not overloaded. Use a dedicated circuit, never an extension cord or power strip, and never a damaged outlet.
Do plug-in kits qualify for the federal solar tax credit?
The residential clean energy credit (25D) was changed by the 2025 federal tax law and is being phased out for systems placed in service after 2025. Check the current IRS guidance before counting on it, and check your state page for local incentives.
How much power does an 800 W kit really make?
Typically 900 to 1,400 kWh a year on a tilted south-facing mount, and 30 to 50% less on a vertical balcony railing. Our calculator uses your state's solar resource.
Can I use it in an apartment?
Yes, that is the main point. Railing mounts, patio stands and even window-adjacent setups work. Check your lease and HOA rules on appearance and drilling.
What happens to extra power I do not use?
It flows out to the grid. If you have net metering you may be credited; most plug-in laws do not require utilities to pay for exports, so the economics depend on using the power as it is made.
Can I add a battery later?
Some systems (EcoFlow STREAM, Anker SOLIX Solarbank, Zendure SolarFlow) are modular and accept a battery later. Simple panel + microinverter kits generally cannot.
Will it damage my appliances or meter?
No. The inverter produces clean 60 Hz power synchronized to the grid. Older analog meters may run backwards; utilities usually swap them for digital ones.