Plug-in solar panels: what is actually sold in the US

The first job is deciding which of the three you are actually shopping for. They are not variations on a theme; they solve different problems and none of them substitutes for another.

Group one, the true plug-in system. A panel feeds a microinverter, the inverter ends in a standard plug, and the power goes backwards into the circuit that outlet sits on. Your meter sees less draw. Nothing is stored. This is the only group the phrase plug-in solar properly describes.

Group two, the battery charger. Panels charge a portable station or a home battery. Nothing flows back into the house wiring; the battery supplies a socket on the box. Useful during an outage, which group one can never be.

Group three, the off-grid panel set. Panels, a charge controller and cables. No inverter, no plug, no grid. These are for sheds, boats and vans, and they are the cheapest thing in the results because they are the least complete.

One reading tip that saves time. If the listing mentions a charge controller or a lithium battery, it is not in group one. If it mentions a microinverter and a plug, it might be. If it mentions neither, it is a panel.

Two standards appear in this category, and they cover different things.

UL 1741 is the standard for grid-tied inverters. It covers the electronics that synchronize with the grid and disconnect when the grid goes away. That last behavior is anti-islanding protection, and it exists to protect line workers, not to improve your system.

UL 3700 is newer and narrower: it addresses a complete plug-in system, including the cord and the plug, tested as a unit in the outlet-connected configuration. The distinction matters because an inverter tested in a hardwired installation has not been tested the way you intend to use it.

Here is the part that requires care. A listing for one standard is not a listing for the other, and a missing certificate does not by itself settle whether something is permitted. Rules differ by state and by utility, and some states have created a specific legal pathway for small outlet-connected systems. Do not treat a page like this one as a verdict. Treat it as the list of questions to put to your utility.

People assume the limit on a plug-in system is the space available for panels. It is almost always the circuit. A 15 A, 120 V branch circuit is rated for 1,800 W, and electrical code limits a continuous load to 80% of that, which is about 1,440 W (NEC 210.19(A)(1), the 125% continuous-load rule). Continuous means three hours or more, and a solar array runs all afternoon.

That 1,440 W is a ceiling for the whole circuit, not for your kit. A television, a lamp and a charger share it. So a realistic plug-in system sits at 600 to 800 W per circuit, which is why almost every microinverter in this category stops there, and why the 1,200 W and 1,600 W kits are documented as multiple inverters rather than one big one.

The practical consequence: a large array means planning circuits, not buying a bigger box. Two inverters on two circuits is a normal design. One inverter asked to carry 1,600 W through a single outlet is a fire risk dressed up as a specification.

One more thing about that ceiling: it applies to the circuit, not to the panel. Two identical 800 W arrays on two circuits are safer than one 1,600 W array on one, and they cost about the same in hardware. The planning effort is what differs, and it is the part nobody advertises.

This table is where most of the kits in the next sections fall into place, and it is also the reason a 1,600 W kit is not automatically better than an 800 W one. If you have one usable outlet, the bigger kit is not an upgrade; it is a constraint you have not noticed yet.

A plug-in kit is described by its watts, but the watts are the least interesting part. What decides whether the install happens next weekend is what arrives in the box.

There is a quick way to tell how complete a kit is: count the nouns in the listing. Panels, inverter, cable, mount, plug, warranty, manual. A listing that names five of those seven is a kit. A listing that names two is a component with a marketing department.

Three things are frequently missing. Mounting hardware is sometimes listed as included and sometimes is a rail system sold separately. Cable length is the second: a 16 ft cable rules out most balconies, a 50 ft cable is what makes a ground-floor outlet reachable. The plug type is the third, and it is the one people check last: NEMA 5-15 is the ordinary three-prong household plug, and anything else means an adapter, which is exactly the kind of shortcut that turns a safe install into an unsafe one.

A fourth item is not in the box and never will be: knowledge of your circuit. Before the kit arrives you should know which breaker the outlet is on, what else shares it, and whether it is GFCI protected. That is fifteen minutes with a lamp and a breaker panel, and it prevents the whole plan from collapsing on delivery day.

The list below splits by what you are trying to do, because two people buying the same 800 W kit are often solving different problems. Check the certification and the circuit plan on the listing before buying; check the price there too, because we do not print prices and a price printed today would be wrong tomorrow.

Kits and inverters are sold separately often enough that a combination is sometimes the better purchase. The two below are the ones the numbers support, and both stay inside the circuit limits above.

The third row is the one most people should consider first. An inverter with no stated certification is not a bargain; it is an unfinished product with a price tag, and the missing part is the part that keeps your wiring safe.

One place to compare the shortlist without scrolling back. The right column is the part that matters: in this category the difference between a good purchase and a return shipment is usually something the listing does not include.

• PluggedSolar 800 W kit — four panels and one inverter.
• PluggedSolar 1,200 W kit — six panels.
• PluggedSolar 1,600 W kit — eight panels.
• PluggedSolar wall-plug kit — the simplest box to understand.
• PluggedSolar 1.8 kW kit — the largest here.
• Renogy 200 W suitcase set — panels, a 20 A controller and a carry case; lacks an inverter.
• HQST 200 W panel — two panels in one folding case; lacks an inverter.
• Jackery SolarSaga 200 W — one rigid panel; lacks an inverter and a controller.
• — a portable panel; lacks an inverter and a controller.

Read the right-hand column as a to-do list rather than a disqualification. Most of those gaps are cheap to close with a cable, a rail kit or a phone call. The two that are not cheap are certification and circuits, which is why they sit at the top of the page rather than at the bottom.

This is the step people skip, and it is the only one that can invalidate the purchase entirely. Two questions decide it.

Is an outlet-connected system permitted here at all? Some states have passed laws creating that pathway for small systems; others have not, and local code may still require a dedicated circuit or a permit. A state law that permits something does not remove a utility's interconnection process.

Does your tariff credit exported power? If it does, surplus generation has value and a slightly larger array makes sense. If it does not, surplus is donated to the grid and the only savings come from power you use while it is produced. That single answer moves the right array size by a panel or two, and no listing will tell you which case you are in.

Ask both before the purchase, not after. A kit that arrives in a state where the connection is not permitted is not a bargain; it is a return shipment.

Every list on this page is organized by watts, and watts are the wrong place to start. Start with your daily energy and your local sun hours, then let the arithmetic choose the array. The calculator on the right does exactly that: daily energy in Wh, peak sun hours, panel size, system efficiency and inverter size, and the panel count falls out.

Two of those inputs are yours and one is your location's. Daily energy comes from your appliances and our load calculator turns a list of them into Wh. Sun hours are regional, and the full method, with the losses that make the array bigger than the division suggests, is on the panel sizing page.

A useful sanity check before you shop: a house using 2,160 Wh a day in a 4.5 sun-hour region needs about 600 W of panels. In a 3.2 sun-hour region it needs about 844 W, which rounds up to three panels. Same house, two different purchases, decided before any brand entered the conversation.

Buying a battery charger believing it is plug-in. The photographs look identical and the outcome is completely different: nothing feeds the house, and the bill does not move.

Assuming a certification you did not read. A listing that mentions an inverter standard is not the same as one that mentions the outlet-connected standard. Read the model, not the brand.

Sizing to the outlet you have rather than the one you could add. Two circuits often cost less than the upgrade path people buy instead.

Skipping the export question. Without export credit, an oversized array wastes money on panels whose output is given away at noon.

Treating watts as the quality measure. A certified 800 W kit outperforms an uncertified 1,600 W kit in every way that matters, including whether you can legally plug it in.

We have not bought or tested any product on this page. Specifications come from the listings, the grouping comes from the arithmetic above, and the certification column is the one to verify yourself. This page is not electrical advice and it is not legal advice: connecting a generating source to a house involves code, utility and equipment questions that vary by state and by city, and regulations change. Have a licensed electrician review the circuit, and ask your utility about interconnection and metering before anything is plugged in.

Deciding between panels and a battery is a different question from choosing panels, and the plug-in solar vs power station comparison prices both routes on the same axes, including the backup hours a grid-tied array cannot provide.

New to the category? The guide on how plug-in solar works walks the chain from panel to meter, including why it stops in an outage.

If you are still deciding whether this category suits a balcony at all, the guide on balcony solar kits covers the box contents, the circuit limit and what a balcony really produces.

Unit questions go to the unit converter, and the charge side to the controller sizing calculator.