How Many Balcony Solar Panels Can I Plug In? State Limits

How many balcony solar panels you can plug in is set by watts, not by a panel count. US plug-in laws cap the inverter’s AC output, usually at 1,200 W, and many also allow only one system or device per meter. You can connect more panel watts than the cap, but the inverter throws away whatever it can’t deliver.

What matters is your state’s cap and what it counts per: device, outlet, meter, customer or home. The table below covers every state with a signed law, taken from the law texts.

Why the inverter, not the panel count, sets the limit

The inverter sets the limit because every state law measures what the kit pushes into your wiring, and that is the inverter’s AC output. Panels make DC power that the inverter converts, so the panel count only matters up to what the inverter can deliver.

You can see it in the wording. New Hampshire’s law allows “a maximum inverter output of 1,200 watts AC” (Chapter 262). Vermont caps the “maximum combined inverter capacity” (Act 149). Maine counts “combined inverter output” (Chapter 644), and Colorado counts output “to the electric grid” (HB26-1007).

With panels of about 400 watts each, the size BSW-Solar calls standard, a 1,200 W cap matches three panels on a 1,200 W inverter. Which size actually pays off for you is a different question, covered in our balcony solar kit size guide.

How many balcony solar panels can I plug in, state by state?

States with a plug-in solar law split into three groups: one system per meter or address, a combined cap per meter or home that can cover several devices, and a cap written per device.

State	How many	Cap	Counted per	Law
Colorado	One system; one device per outlet	1,920 W to the grid	Address	HB26-1007
Maryland	One system	1,200 W	Electric meter	Chapter 353
Connecticut	One device	1,200 W	Customer meter	HB 5340
New Hampshire	One system	1,200 W AC	Metered customer	Chapter 262
Vermont	One or more devices	1,200 W combined	Electric meter	Act 149
Virginia	More than one allowed; utility may add a disconnect switch	1,200 W	Customer, or unit in multi-family housing	Chapter 1052
Maine	Any number within the total	420 W DIY; up to 1,200 W with an electrician	Service address	Chapter 644
California	Any number within the total	1,200 W aggregated AC	Dwelling	SB 868
New Jersey	Any number within the total	1,200 W combined	Not stated per meter	S2368
Utah	Cap written per device	1,200 W	Device	HB 340

Timing matters too. California, New Hampshire and Virginia take effect January 1, 2027, and most reporting puts New Jersey at March 1, 2027. Our balcony solar laws by state page tracks the status, cap and sources for all 50 states.

The one-per-meter states: Colorado, Maryland, Connecticut, New Hampshire

In Colorado, Maryland, Connecticut and New Hampshire, you get one plug-in system or device, so the honest answer to “how many” is one kit at or under the cap. Adding a second kit later on the same meter breaks the rule.

Colorado defines the device as “a single photovoltaic system per address” and caps it at 1,920 W to the grid. It also says a customer “shall not connect more than one device to a single wall outlet per address.” The law has been in effect since August 12, 2026.
Maryland says a person may install “not more than one” portable system “per electric meter for residential use only,” up to 1,200 W. You must notify your utility before installing.
Connecticut allows one device of up to 1,200 W per customer meter, plugged into a standard 120-volt outlet.
New Hampshire gives “each metered customer” a maximum of one system, from January 1, 2027.

Colorado’s 1,920 W cap is the highest in the US, but it comes with a circuit catch. By my math, 1,920 W at 120 volts is 16 amps, more than a 15-amp circuit’s rating.

The combined-cap states: Vermont, Virginia, Maine, California

Vermont, Virginia, Maine and California let you split the allowance across more than one device, as long as the total stays under the cap.

Vermont is the clearest. A customer “may install one or more plug-in photovoltaic devices per electric meter” if their “maximum combined inverter capacity” is 1,200 W or less. Vermont also requires a smart meter.

Virginia caps output at 1,200 W per customer, or per unit in multi-family housing. With more than one device at a property, or where the circuit requires it, your utility may install an automatic locking disconnect switch. You also file a notification form before you install, and the utility has 15 days to review it.

Maine counts per service address. You can install up to 420 W of combined inverter output yourself. Above 420 W, up to 1,200 W, each system needs a Maine-licensed electrician on a dedicated circuit with a single outlet, plus a utility notice within 30 days.

California caps the “aggregated AC output” at 1,200 W per dwelling under SB 868, starting January 1, 2027.

Utah is the odd one. Its law caps each device at 1,200 W, and I found no per-meter or per-home count in it. That isn’t permission to stack kits: the circuit limits in the next sections still apply.

A real example: two 600 W microinverters in Vermont vs New Hampshire

Two 600 W microinverters on one meter are legal in Vermont and doubtful in New Hampshire, even though the total is the same 1,200 W. The difference is what each law counts.

Say you buy a 600 W kit this spring and want to add a second one next year. In Vermont, both devices together total 1,200 W of inverter capacity, which is exactly the combined limit. By my math, they’d add 10 amps at 120 volts, the same as one 1,200 W inverter.

In New Hampshire, the law allows one system per metered customer. A second kit bought later is a second system, which the rule doesn’t allow. Whether two inverters sold together as one kit count as one system, the text doesn’t say. Maryland’s and Connecticut’s wording raises the same question, so ask your utility before you buy.

Can panel watts exceed inverter watts? Clipping explained

Panel watts can exceed inverter watts, and on a balcony kit they often do, because state caps count only AC output. When the panels could make more than the inverter’s rating, the inverter caps its output and the surplus is lost. That loss is called clipping.

Sandia’s modeling group says clipping “occurs when the DC power from the PV array exceeds the maximum input level for the inverter.” NREL’s PVWatts manual says that above the rating, output “is clipped to the nameplate value.” Its default DC-to-AC ratio is 1.1.

Some oversizing pays, because extra panels keep producing in mornings, evenings and cloudy hours. Our microinverter guide modeled 1,600 W of panels on an 800 W inverter. That setup lost 13% to 18% of the year’s energy to clipping, but still made 63% to 73% more than 800 W of panels alone. By my math, four 400 W panels on a 1,200 W inverter is a ratio of 1.33.

Two limits still apply. Panel voltage must stay under the inverter’s maximum input voltage, Sandia notes, and the inverter’s datasheet sets how many panels each input takes.

Daisy-chaining microinverters: why more devices add current

Daisy-chaining means wiring several microinverters’ AC outputs together on one circuit, and their currents add up. More devices on one circuit means more current in that wire, which your breaker can’t see.

Hoymiles, a microinverter maker, showed the math in a December 2022 installer guide. Its HM-1500 puts out 6.52 amps. Three units total 19.56 amps, under the 25-amp terminal rating; four total 26.08 amps, which exceeds it. So that model’s datasheet allows three units per branch.

The bigger risk on a balcony is the house wiring. UL Solutions warns in IAEI Magazine that combined utility and solar current “can exceed conductor ratings without tripping the circuit breaker.” An Intertek column in the same magazine flags overcurrent “if multiple devices are connected to the same branch circuit.” It adds that questions like how many devices one circuit can take don’t yet have consistent answers.

Our wall outlet guide covers outlet types and dedicated circuits, and the fire guide explains how an overloaded wire heats up. Germany’s consumer center, the Verbraucherzentrale, says to connect only one device, directly to the outlet, with no power strip.

What Germany allows: 2,000 W in law vs 960 W in the norm

Germany allows up to 800 VA of inverter output and 2,000 W of panels in total per household connection under its renewable energy law. A separate product norm sets a lower 960 W panel threshold for using an ordinary household plug.

The law. Since Solarpaket I came into force in May 2024, Section 8(5a) of the EEG covers “one or more” plug-in devices with up to 2 kW of installed power and 800 VA of inverter power in total, behind one consumer’s connection point. The Bundesnetzagentur, the federal grid regulator, says all devices behind the same connection point are added together.

The product norm. DIN VDE V 0126-95 is a safety standard for the device itself. BSW-Solar says its simplifications cover up to 960 W of modules with an inverter of at most 800 W. The Verbraucherzentrale adds that above 960 W of modules, the norm requires a special feed-in plug instead of a standard Schuko plug.

A German household can legally run 2,000 W of panels, but past 960 W the kit falls outside the plug-and-go norm. By my math, the legal ceiling is a DC-to-AC ratio of 2.5, while the norm’s is 1.2. The 800 VA output cap is the same under both.

My take, and the limits of this guide

My take: count inverters, not panels. Buy one certified kit whose AC output fits your state’s cap, then add panels only up to a modest ratio over the inverter. In a one-per-meter state, a second kit next year isn’t an option, so pick the size you’ll keep.

The limit of this guide: several laws don’t define whether two inverters sold as one kit are one “system,” and New Jersey’s text, as summarized, doesn’t say what the combined cap is counted per. Laws also change: Massachusetts and New York have bills pending. Read your own state’s law text, check your lease or HOA, and ask your utility when the wording is unclear.

FAQ

How many plug-in solar panels can you have?

US laws don’t count panels. They cap the inverter’s AC output, usually 1,200 W, and several limit you to one system or device per meter. You can hang more panel watts than the cap, but the inverter clips the extra at midday.

What are the laws in Colorado regarding plug-in solar panels?

Colorado’s HB26-1007, in effect since August 12, 2026, allows one plug-in system per address of up to 1,920 W to the grid. You can’t connect more than one device to a single wall outlet, and the device must be listed by a national testing lab.

Can I plug two balcony solar kits into different outlets?

It depends on your state. Vermont allows more than one device per meter if the combined inverter output stays at 1,200 W or less. Maryland, Connecticut and New Hampshire allow only one system or device per meter, and Virginia lets your utility add a disconnect switch if you have more than one device.

Can I have a solar panel on my balcony?

In states with a plug-in solar law, yes, within the wattage cap and any per-meter limit, though your lease or HOA may add rules. In states without a law, a grid-tied kit usually needs your utility’s interconnection approval.