Can I plug a solar panel into any outlet?

Only a kit built for it. Plug-in systems use a microinverter that syncs with grid power and shuts off when the grid or the plug is disconnected. Connecting an ordinary panel or an off-grid inverter to an outlet is dangerous and not what any state law allows.

Does plug-in solar work during a power outage?

No. Every state law requires the system to stop sending power into the building wiring when the grid goes down, so line workers and your own wiring stay safe. Some kits add a battery with a separate outlet you can use during an outage.

How much power does a balcony solar kit make?

In our model, an 800 W kit hung vertically on a south-facing railing makes roughly 750 to 930 kWh a year in states that have passed plug-in laws, less than a tenth of what a typical US home uses. East or west railings make about a fifth less.

Do I need my utility's permission?

In the states with plug-in laws, utilities generally cannot require approval or charge a fee, but several states still require you to notify the utility first. Virginia and Maryland require notice before installation. Check your state page.

What is plug-in solar? How balcony solar kits work in the US

A plug-in solar system, often called balcony solar, is a small solar kit you connect to your home by plugging it into an ordinary wall outlet. It usually has one to four panels and a microinverter, and it is sized to cover part of the power your home is already using, not to replace your utility.

Until 2025 there was no clear legal path for this in the US. Utah changed that with HB 340, and by October 2026 ten states had signed plug-in solar laws. Most cap a system at 1,200 W. See the state map.

A typical setup: panels hang on the railing, a short cable runs to the microinverter, and a plug goes to an outlet inside. Drawing by Balcony Solar Atlas.

What is in a kit

A plug-in kit has four parts, and the microinverter is the one that matters most for safety.

Panels. Usually one to four, often 100 to 450 W each. Balcony kits use lighter frames or flexible modules and come with railing clamps or a stand.
Microinverter. Converts the panels’ direct current into 120 V alternating current that matches the grid. State laws require it to stop feeding power if the grid goes down. Utah’s statute calls this a “device or feature that prevents the system from energizing the building’s electrical system during a power outage.”
Cable and plug. Carries the AC output to a standard outlet. Newer certified systems are designed so the plug’s pins cannot carry live voltage once unplugged.
Mounting. Railing hooks, wall brackets or a ground stand. In practice this decides how much energy you get, because the angle and direction of the panels matter more than any other choice. More on orientation.

Some kits add a battery that stores midday output for the evening. A battery changes the economics and the safety review, so we cover it separately in how to choose a kit.

Where the power goes

Plug-in solar does not store or export power in any useful way. It offsets what your home is drawing at that moment. That is why sizing against your always-on load matters more than buying the biggest kit.

When the microinverter pushes power into the outlet, it flows to whatever is running on your home wiring at that moment: the fridge, the router, a laptop charger. Your meter sees less demand, and that is the saving.

What plug-in solar does not do well is earn money from exports. Vermont’s law says plainly that these devices get no net metering and exported power is not compensated, and Maine excludes them from net energy billing. Maryland’s Public Service Commission warns that if your meter cannot measure power going back to the grid, the excess may count as zero or even be added to your usage. The practical rule is to size the kit to your home’s background draw. Our calculator does this for you.

How much can it power?

A small kit runs part of your always-on load. In our model, an 800 W kit hanging vertically on a south-facing railing produces about 800 kWh a year in Maryland and about 930 kWh in California. That is more than a typical modern refrigerator uses in a year.

Kit, mounted vertically facing south	Maryland	California	Vermont
400 W (one or two panels)	about 400 kWh/yr	about 465 kWh/yr	about 380 kWh/yr
800 W (two to four panels)	about 800 kWh/yr	about 930 kWh/yr	about 760 kWh/yr
1,200 W (state maximum)	about 1,200 kWh/yr	about 1,390 kWh/yr	about 1,140 kWh/yr

These figures come from our model, which combines NREL sun data for each state’s largest city with our own tilt and orientation analysis. Tilting the panels toward the sky on a stand instead of hanging them flat can add about half again as much energy, if your balcony and building rules allow it. See the method.

Why it is suddenly legal

Small solar used to fall under the same interconnection rules as a rooftop system: an application, a utility review and often an electrician. That paperwork made no sense for a few hundred watts. The new state laws carve out a simpler category. Typically they:

Cap the size, usually at 1,200 W of output.
Require certification by a nationally recognized testing laboratory, increasingly to UL 3700, the first US test program written for plug-in solar.
Exempt the device from interconnection agreements and utility fees.
Replace approval with, at most, a notification form.

The details differ in ways that matter. Vermont gives tenants a defined notice process. New Jersey bars landlords and HOAs from banning the devices outright. California’s law leaves lease terms in force. New Hampshire’s law waits on a state-recognized safety standard before use is allowed. Each state page lists the exact rules with links to the statute.

Is it for you?

Plug-in solar makes the most sense if you:

Pay a high electricity rate. In the EIA’s 2026 data, residential prices run from about 12 cents per kWh in North Dakota to over 32 cents in California and 46 cents in Hawaii.
Have a railing, wall or patio that gets several hours of direct sun, ideally facing between southeast and southwest.
Have an always-on load of a couple of hundred watts during the day, which most homes with a fridge do.
Live in a state with a plug-in law, or have confirmed with your utility that it is allowed.

It makes less sense on a north-facing balcony, under heavy shade, or where your lease or building rules forbid fixtures on the railing. Read is plug-in solar worth it for payback by state, and is plug-in solar safe before you plug anything in.