Quick answer: Plug-in solar is a small solar kit, usually up to about 1,200 watts, that plugs into a standard household outlet and feeds power into your home’s circuits. It lowers your electric bill a little every sunny day, needs no roof and no installer in states that allow it, and can move with you. It does not keep your lights on during a blackout unless you add a battery.
Plug-in solar (also called balcony solar or plug-and-play solar) started in Germany, where millions of small systems hang on balconies and fences. In the U.S. it was a legal gray zone until 2025, when Utah became the first state to pass a law for it. Several more states followed in 2026, including California, whose law takes effect on January 1, 2027. See our state-by-state guide for where it stands today.
How plug-in solar works
A plug-in solar kit has three main parts:
- One or more solar panels, typically 400 to 1,200 watts in total.
- A microinverter that turns the panels’ DC power into the same AC power your outlets use.
- A plug and cable that connect the inverter to an ordinary outlet.
When the sun shines, the inverter pushes power into the circuit. Anything running in your home at that moment (fridge, router, TV, laptop chargers) uses the solar power first, so you buy less from the utility. When the grid goes down, a certified inverter must switch off within a fraction of a second. That is a safety feature: it stops the panels from sending power into lines that utility workers may be repairing.
How much can it save?
Savings depend on four numbers: the kit’s size, how much sun it gets, how it is angled, and what you pay per kilowatt-hour (kWh). Here is the formula we use:
Yearly kWh ≈ kit watts ÷ 1,000 × peak sun hours × 365 × system factor
The system factor covers inverter losses, heat, shade and panel angle. A panel tilted toward the sun might reach 0.75. A panel hanging flat against a balcony railing may get closer to 0.45. These are our estimates, not measurements.
| Example (800 W kit, 4 peak sun hours) | Yearly output | Savings at 18.2¢/kWh |
|---|---|---|
| Well angled, south-facing (factor 0.75) | about 876 kWh | about $160 |
| Vertical balcony railing (factor 0.45) | about 526 kWh | about $96 |
The 18.2¢/kWh rate is the U.S. average residential price the Energy Information Administration expects for 2026. If you pay more (much of New England and California pays 25¢ to 30¢ or more), your savings rise in proportion.
The catch most sellers skip: most plug-in laws do not pay you for power you send back to the grid. If your panels produce 600 watts at noon but your home only uses 200 watts at that moment, the extra 400 watts flow out for free. A kit pays off fastest when it is sized to your home’s daytime base load: the power your home draws all day even when you are out. Read our full breakdown in Is Plug-In Solar Worth It?
Where is plug-in solar legal?
As of November 2026, around ten states have signed plug-in solar laws, including Utah, Maine, Virginia, Maryland, Colorado, Connecticut, New Hampshire, Vermont, New Jersey and California. New York’s bill passed the legislature and was waiting for the governor’s decision when we last checked. Signed is not the same as in effect: California’s law starts January 1, 2027, and New Jersey’s takes effect six months after it was signed.
Most laws share the same core ideas:
- A size cap, usually 1,200 watts of AC output (Colorado allows more; Maine has a lower no-electrician limit).
- The device must be certified by a recognized testing lab such as UL.
- The utility cannot require a full interconnection agreement or charge fees, though some states allow a simple registration or notice.
- No payment for exported power in most cases.
In states without a plug-in law, your utility’s normal solar rules still apply, which usually means an application before you connect anything. Check our state-by-state guide before you buy.
Can renters use plug-in solar?
Often, yes. That is one of the main reasons people want it. You need a balcony, patio, fence or yard with sun, and an outdoor or nearby outlet. But a state law that stops utilities from blocking plug-in solar does not automatically override your lease or HOA rules. Some states, such as Virginia and Colorado, add protections for renters or HOA members; others, such as California, do not. Ask your landlord in writing before mounting anything to the building.
What to check before you buy a kit
- Your state’s law and its start date. Do not connect before the law is in effect.
- Certification. Look for a kit certified for plug-in use by a recognized lab, not just “UL-listed parts.”
- Total AC output. Stay at or below your state’s cap, and remember the cap is usually per home or per meter.
- The circuit. Plug into a circuit that is not already heavily loaded. If in doubt, ask an electrician.
- Mounting. Balcony railings, ground stands and walls each need different hardware. Wind matters.
- Your daytime use. Size the kit to what your home uses during sunny hours, not to the maximum allowed.
Plug-in solar vs. a power station vs. a home battery
These three products solve different problems:
| Product | Lowers your bill? | Works during a blackout? | Typical use |
|---|---|---|---|
| Plug-in solar kit (no battery) | Yes, a little every sunny day | No | Everyday savings |
| Portable power station with solar panels | Slightly | Yes, for what you plug into it | Outages, camping, apartments |
| Home battery backup | Can, with solar and the right rate plan | Yes, for wired circuits | Whole-home or essential-circuit backup |
Some newer plug-in kits include a small battery, which lets you store midday solar for the evening and, on some models, power a few devices during an outage. Check exactly what a model can do during an outage before you count on it.
Is plug-in solar safe?
Certified plug-in systems are designed to shut off instantly when the grid fails, and laws require that protection. The main risks come from uncertified equipment, overloaded circuits and poor mounting. Use a certified kit, a suitable circuit and solid mounting hardware, and follow the manufacturer’s instructions. Never build your own “suicide cord” setup with male-to-male plugs.
Frequently asked questions
How many watts is a typical plug-in solar kit?
Most kits sold for U.S. plug-in laws are between 400 and 1,200 watts, because 1,200 watts is the most common legal cap.
Do I need an electrician?
In states with a plug-in law, a certified kit within the size limit usually does not need one. Maine requires a licensed electrician above 420 watts. If your wiring is old or your outlet is on a busy circuit, an electrician visit is cheap insurance.
Will my utility know?
Some states let utilities require a simple registration with your address and the kit’s make and model. Others require nothing. Your meter will simply show lower usage.
Does plug-in solar work during a power outage?
Not on its own. A certified inverter shuts down when the grid goes down. You need a battery or power station for outage power.
Sources
- U.S. Energy Information Administration, Short-Term Energy Outlook (2026 residential price forecast).
- State bill texts and legislature pages, summarized in our state-by-state guide.
*Last checked: November 5, 2026. Savings figures are estimates based on the stated assumptions.*