Is plug-in solar safe?

Plug-in solar: small panels that plug into a wall outlet. The idea is simple, but it puts power into your home's wiring in a new way. Safety experts name three risks, and the laws differ by state.

What plug-in solar is

A kit has one or more panels and a small box called an inverter. You plug its cord into an outlet. The power flows into your home's wiring and covers part of what your home is using.

The state laws we read cap a kit at 1,200 watts in most places. Watts: how fast something uses power. By our count that is about what one microwave uses.

How it differs from a power station

A power station is a battery in a box. You plug your things into the box. Nothing flows into the house wiring.

A plug-in solar kit works the other way around. UL Solutions, a safety lab, says these kits send power back into a home circuit through a normal outlet. It says today's electrical codes were not written for that.

Question	Plug-in solar kit	Portable power station
Where does the power go?	Into your home's wiring	Only into the things you plug into it
Does it work in a blackout?	No, it must shut off	Yes, until it is empty
Does it store power?	Only if the kit has a battery	Yes

Three safety risks to know

UL Solutions names three risks.

1. Can the plug shock you? UL says the plug's metal blades can be live when the panel is in the sun.
2. Can it overload a circuit? UL says power from the kit and power from the grid can add up in one wire, and the breaker may not trip.
3. Does the shock protection still work? UL says a kit can "blind" a GFCI, the safety device used for outdoor and wet places.

In January 2026, UL Solutions opened a certification program built on UL 3700, its outline for plug-in solar. UL says it calls for features that guard against touching live parts, guard against overloads and stop power from flowing the wrong way.

Some sellers say a kit is "compliant" with UL 3700. That is not the same as listed. As of October 4, 2026, we could not confirm that any complete kit you can buy has a UL 3700 listing.

Will it power your home in a blackout?

In most cases, no. The laws we read make the kit shut off when the grid goes down.

Connecticut's law says the device must keep from energizing the building during a power outage. Maine's law says the inverter must shut off after 0.2 seconds if power is disrupted. California's law calls for a certified feature that cuts the device off in an outage, so it cannot push power back into the grid.

The exception is a kit with a battery made for the job. EcoFlow says its STREAM system stops feeding the grid in an outage. Then you plug your things straight into the outlets on the unit.

For power in a blackout, a power station is the simpler tool. Start with Find My Power, or read backup power for a whole home.

Where the laws stand

As of October 4, 2026, 6 states have a plug-in solar law in effect. 4 more have passed a law that starts later. Our plug-in solar state map shows every state and links each law.

State	Watt limit	Status and key rule
Colorado	1,920	In effect. One device per address. It must be listed by a safety lab.
Connecticut	1,200	In effect. One device per meter. It must be safety-certified.
Maine	1,200	In effect. Up to 420 watts you can plug in yourself. Above that: a licensed electrician, a dedicated circuit, and notice to the power company within 30 days.
Maryland	1,200	In effect. One system per meter. Tell the power company before you install it.
Utah	1,200	In effect. The kit must be safety-certified. We read this law in an archived copy of the state's file.
Vermont	1,200	In effect. The kit must meet UL 3700, and the home needs a smart meter.
California	1,200	Passed. Starts January 1, 2027.
New Hampshire	1,200	Passed. Starts January 1, 2027, but the City of Dover says use will not be legal until the state certifies a national safety standard.
Virginia	1,200	Passed. Starts January 1, 2027. You send a notice form to the power company first.
New Jersey	1,200	Signed September 1, 2026. We have not read the law's text. Bill trackers give March 1, 2027 as the start. We could not confirm it.

The other 40 states and Washington, D.C. have no plug-in solar law yet.

These laws remove the need for the power company's approval. They do not make an uncertified kit OK. Connecticut's law says building and fire codes still apply.

Rules differ, and this page is not legal advice. Check with your power company before you buy.

Before you buy

• Look up your state on our map.
• Ask the seller for proof that the whole kit is listed by a safety lab, not just one part of it.
• Ask a licensed electrician about the outlet and the circuit you plan to use. UL lists a dedicated circuit as one way to lower the overload risk.
• If you rent, read your lease and ask your landlord first.

A kit is not backup power. For that, see our picks or compare two boxes. Our guide to the two numbers on every box helps you read a spec sheet. We opened and read every law and maker page linked here. See how we check.

Questions people ask

Does plug-in solar work when the power is out?

In most cases, no. A kit must shut off when the grid is down, unless it has a battery made for outages.

Is there a plug-in solar law in my state?

As of October 4, 2026, six states have one in effect and four more have passed one that starts later. The table above names them. See the state map for the rest.

What is UL 3700?

It is UL Solutions' outline for plug-in solar equipment. UL opened a certification program based on it in January 2026. Vermont's law names it.

How many watts can I plug in?

1,200 in most of the states with a law. Colorado's limit is 1,920. In Maine, anything above 420 watts needs a licensed electrician.