Last checked: 31 October 2026 · Rules change fast, so always check your local rules before you buy.

Plug-In Solar (Balcony Solar): The Complete Guide + Savings Checker for Any Country

A small solar kit that plugs into a wall socket and cuts your daytime power bill. Here is how it works, whether it's allowed where you live, and what it could save you.

Compare plug-in solar kits

These are the brands we compare below. Check each store for the current price, local certification and whether it ships to your country. We may earn a commission if you buy through these links, at no extra cost to you.

Compare EcoFlow plug-in kitsECOFLOW_AFFILIATE See Anker SOLIX balcony solarANKER_AFFILIATE See BLUETTI Balco balcony solarBLUETTI_AFFILIATE See Jackery (US store)JACKERY_AFFILIATE Jackery SolarVault (Germany/EU store)JACKERY_DE_AFFILIATE

On this page: What it is How it works Savings checker Cost & payback Seasons Kit comparison Rules by country US states Excess power Renters Safety Install steps Batteries Your bill Myths CO2 FAQ Sources

1. What plug-in solar is, from zero

Plug-in solar (also called balcony solar, Balkonkraftwerk in Germany, or a "Steckersolargerät") is a small solar power system you can set up yourself. A typical kit has one to four solar panels, a small box called a microinverter, and a cable with a plug.

You hang the panels on a balcony railing, stand them in the garden, or fix them to a wall or flat roof. Then you plug the cable into an outdoor or indoor wall socket. That's it. No roof crew, no big contract.

How it works

Panels turn sunlight into direct current (DC) electricity.
The microinverter turns that into the same alternating current (AC) your home uses, and matches the grid's voltage and timing.
The power flows through the socket into your home's wiring. Your fridge, router, TV or washing machine, if running at that moment, use the solar power first.
Your meter sees less power coming from the grid, so you buy less. That's where the saving comes from.
If the grid goes down, the inverter switches off automatically (anti-islanding). This protects line workers.

Benefits

Lower bills on power you use during the day.
Works for renters and flat owners who can't get rooftop solar.
You can take it with you when you move.
No installer needed where the law allows DIY plug-in.

Limits (the honest part)

It's small. Legal caps are about 800 W (Europe, UK) or 1,200 W (most US laws). It won't run a whole house.
It only saves money on power you use while the sun shines, unless you add a battery.
Power you don't use often goes to the grid for little or no pay (see excess power).
It does not work in a power cut on its own.
Shade and a bad angle can cut output a lot.

2. Plug-in solar savings checker

Where do you live?

Total panel power (watts, DC) Add the watts on each panel's label. Example: 2 × 400 W = 800 W. Panel tilt Panels face Shade Share you use yourself (%) Your assumption. Higher if someone is home in the day or you have a battery; lower if the house is empty all day. A smart plug or app shows your real number. Your electricity price per kWh () What you are paid for exported power per kWh () Usually 0 for plug-in kits. Check your supplier. What the kit costs you, total () Use the real checkout price including mount and any electrician. We do not guess prices.

How it works: sunlight per country comes from the EU's PVGIS tool (version 5.3, 1 kW panel, 35° facing the equator, 14% system loss) for one city per country or US state. Tilt and direction factors come from PVGIS runs for Berlin, so they're rough elsewhere. We count panel watts only up to the local legal inverter cap where there is one (this slightly under-states output for oversized panels). Prices are official averages; your own bill rate is better. This is an estimate, not a promise.

3. Cost breakdown and payback

Payback = what you paid ÷ what you save each year. The checker does this for you once you enter your real cost. What goes into the cost:

Panels + microinverter (or a kit with both). Example: EcoFlow's STREAM Microinverter alone listed at USD $369 on EcoFlow's US store on 31 Oct 2026; panels cost extra.
Mounting: railing hooks, ground stand or wall brackets.
Optional battery: often costs more than the panels and lengthens payback.
Optional electrician: e.g. an "energy socket" in Germany for more than 960 Wp of panels, or a dedicated circuit in Maine above 420 W.

Official pointers: the UK government said plug-in panels could save households "up to £110 a year" (GOV.UK, 27 Aug 2026). Your number depends on your inputs above.

4. Seasonal output: what to expect month by month

kWh per month from 1 kW of panels at 35° facing the equator (PVGIS 5.3). An 800 W kit makes about 80% of these numbers.

City	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Berlin	32	56	91	122	132	133	130	122	103	71	39	28	1058
London	41	53	87	115	119	123	123	110	95	69	48	36	1019
Madrid	108	113	138	142	153	154	169	166	146	126	101	102	1619
New York	102	111	136	134	131	127	132	127	117	105	97	85	1402
Los Angeles	130	132	156	159	158	156	160	166	158	152	133	120	1780
Johannesburg*	132	124	136	132	150	145	158	164	164	154	140	136	1737

*Johannesburg panels face north. In Berlin, December makes about a fifth of June. Near the equator and in the US Sun Belt, output is steadier through the year.

5. Plug-in solar kits compared

Specs from each maker's official product page, checked 31 Oct 2026. Prices change daily, so we don't print them. Check the current price and which country versions are certified.

Product	Type	Grid output	Battery	Solar input	Notes
EcoFlow STREAM Microinverter (US)	Microinverter	1,200 W, 120 V	None (pairs with STREAM Ultra)	Up to 1,200 W, 3 MPPT, 4 PV inputs	UL 1741, NEMA 6, 10-year warranty. EcoFlow lists plug-in use as permitted in UT, MD, CT, CO.
EcoFlow STREAM Ultra (US)	All-in-one with battery	800 W on-grid alone; 1,200 W with Microinverter	1.92 kWh, expandable	4 MPPT	NEMA 4. Ask your utility about net metering first.
Anker SOLIX Solarbank 3 E2700 Pro (EU)	All-in-one with battery	800 W balcony mode (1,200 W AC charging)	2,688 Wh, expandable to about 16 kWh	Up to 3,600 W, 4 MPPT	230 V. Anker DE product page.
Jackery SolarVault 3 Pro (DE)	All-in-one with battery	1,200 W bidirectional AC (set to the local limit)	About 2.5 kWh class (model JS3-2500), expandable	Check page	Jackery Deutschland. Plug-and-play.
BLUETTI Balco 260 (EU)	All-in-one with battery	1,200 W battery output; limited to 800 W where rules require	2,560 Wh, up to 6 units	2,400 W, 4 MPPT	IP65. BLUETTI EU page.

Buying tips: in the US look for UL 3700 or UL 1741 listing (your state's law names which). In Germany look for VDE-AR-N 4105 and DIN VDE V 0126-95. In Great Britain the device must meet the government's Interim Product Specification. In Austria, at least CE marking plus safety instructions.

See the kits

See EcoFlow STREAM plug-in solarECOFLOW_AFFILIATE See Anker SOLIX balcony solarANKER_AFFILIATE See BLUETTI Balco balcony solarBLUETTI_AFFILIATE See Jackery (US store)JACKERY_AFFILIATE Jackery SolarVault (Germany/EU store)JACKERY_DE_AFFILIATE See plug-in solar accessories (energy monitor plugs, mounts)AMAZON_FALLBACK

Prefer to build your own? See the DIY solar guide (test offer)SOLAR_SWITCH_CB

6. Rules by country (last checked October 2026)

Country	Status	Limit	What you must do
Germany	Legal	800 W inverter, 2,000 Wp panels	Register in the Bundesnetzagentur's Marktstammdatenregister within 1 month of switching on. No grid-operator notice if you waive feed-in pay (since 16 May 2024, Solarpaket I). A normal Schuko plug is in line with the standard only up to 960 Wp panels with a device meeting DIN VDE V 0126-95 (from 1 Dec 2025); above that you need an energy socket or a fixed connection by an electrician. Old meters may be swapped for free.
Austria	Legal	800 W per customer	No approval, but tell your grid operator at least 2 weeks before switching on (often online). No feed-in pay. Owner may require an electrician. Never use extension cords or power strips (E-Control, OVE).
United Kingdom (GB)	Legal since 27 Aug 2026	800 W AC, 2,000 W DC	Device must meet the Interim Product Specification and plug directly into a fixed BS 1363 socket. One device per household under G98. Notify your DNO. Check landlord, freeholder, planning or listed-building permission. Check you have modern RCBO protection. Not on buildings under external-wall remediation. No batteries with these devices yet.
Netherlands	Allowed; check rules	Check your grid operator	Net metering ends 1 Jan 2027; after that you get a supplier feed-in rate and may pay feed-in charges.
United States	State by state	Mostly 1,200 W	10 states have laws; see below. Elsewhere, utility interconnection rules apply.
Australia	Not yet	n/a	AS/NZS 4777 requires inverters on fixed wiring installed by a licensed electrician; kits are sold but can't legally be plugged in. WA opened consultation on a safety standard (Oct 2026); energy ministers are exploring a national path.
New Zealand	Not yet	n/a	Government has flagged plans (reported Sep 2026). Check WorkSafe NZ.
South Africa	Check municipality	n/a	NERSA requires registration of grid-connected systems; municipalities set their own rules. City of Cape Town treats a genuine plug-in unit on a socket circuit (not wired to the board, no fixed panels) as non-SSEG; wired or fixed systems need SSEG approval with NRS 097-2-1 inverters.
Other EU countries	Varies	Often 800 W	Ask your grid operator or energy regulator before connecting.

US states with plug-in solar laws

State	Status	Cap	Key points
Colorado	in force	1,920 W	HB26-1007, in force since 12 Aug 2026. Up to 1,920 W; some parts start 1 Jan 2027.
Connecticut	in force	1,200 W	HB 5340 / PA 26-127, in force since 1 Oct 2026. UL 1741 + IEEE 1547; extra output may be billed as usage without a net-metering meter.
Maine	in force	420 W	LD 1730, in force since 29 Jul 2026. 420 W DIY; 420 to 1,200 W only with a licensed electrician on a dedicated circuit.
Maryland	in force	1,200 W	HB 1532 (2026). One system per meter; notify your utility before installing.
Utah	in force	1,200 W	HB 340, in force since 7 May 2025. 120 V outlet, UL or equivalent certification.
Vermont	in force	1,200 W	S.202 / Act 149, in force since 1 Jul 2026. Smart meter required; exported power is not paid.
California	starts 1 Jan 2027	1,200 W	SB 868, signed 30 Sep 2026. Reported 1,200 W per home; check final text and your utility.
New Hampshire	starts 1 Jan 2027	1,200 W	SB 540 (RSA 362-A:10). One system per metered customer, up to 1,200 W AC.
New Jersey	starts 1 Mar 2027	1,200 W	S2368 Garden State Balcony Solar Act. Up to 1,200 W; UL 3700 or comparable.
Virginia	starts 1 Jan 2027	1,200 W	HB 395 / SB 250. Notify your utility on the state form before installing.

All other states: no plug-in law yet (several have bills moving). Sources: state law texts and the New Hampshire statute, with cross-checks from pluginsolarguide.com, solar.com and ecogenamerica.com. Re-checked monthly.

7. What happens to power you don't use

Germany: plug-in kits get "free acceptance": extra power goes to the grid without pay unless you register for feed-in pay with your grid operator.
Austria: no feed-in meter point and no pay for small plug-in units (Salzburg Netz).
Netherlands: net metering until 31 Dec 2026; from 2027 a supplier feed-in rate, possibly with feed-in charges.
UK: ask your supplier whether it pays for exports from a plug-in device.
US: most state laws make plug-in kits ineligible for net metering or don't address it. Vermont doesn't pay for exports. Connecticut devices must warn that extra output may be billed as usage without a net-metering meter. EcoFlow advises checking with your utility first.
Zero-export: some battery systems (e.g. with a smart meter) only feed what your home uses right now, so nothing leaves the house.

Bottom line: size the kit to your daytime base load (fridge, router, standby), not to make export income.

8. Renters, landlords and owners' associations

Germany: since 17 Oct 2024, plug-in solar is a "privileged measure". Tenants can demand permission (§ 554 BGB) and apartment owners can demand approval (§ 20 WEG); refusal only in exceptional cases. The landlord can set how it's mounted.
Austria: clear it with the owner, who may require an electrician.
UK: landlord and/or freeholder permission may be needed, plus planning or listed-building consent in some cases.
US: Vermont (tenant gives 10 days' notice), Colorado (unreasonable bans void from 1 Jan 2027), Virginia (landlords with more than 4 units can't ban), New Jersey (landlords and HOAs can't ban; 14 days' notice). Most other laws are silent, so read your lease and HOA rules.

Plan it before you buy

A printable planner to note your sockets, sun hours, meter readings and monthly savings.

Get the Plug-In Solar Planner & Savings Log on Etsy

9. Basic electrical safety

Do

Buy a certified device for your country (see buying tips).
Plug directly into a fixed wall socket.
Have an electrician check older wiring first (advised by OVE, VDE and the UK specification).
Check you have RCD/RCBO protection.
Use only one device per circuit (UK: one per household).
Fix panels securely against wind; follow the manual.
Keep the inverter shaded and ventilated.

Don't

Never use an extension cord, multi-plug or power strip (Umweltbundesamt, E-Control, EcoFlow).
Don't chain several kits to beat the limit.
Don't exceed the inverter cap by changing software settings: in Germany the nameplate counts.
Don't touch plug pins while panels are in sun; unplug at the socket end only per the manual.
Don't plug into a circuit that already runs big loads (heater, oven) if the manual warns against it.

Call an electrician when

Your home has old fuses or no RCD.
You want more panels than a normal plug allows (Germany above 960 Wp; Maine above 420 W).
Sockets feel warm, scorch marks appear or breakers trip.
You're unsure which sockets share a circuit.

Disclaimer: General information, not electrical, legal or financial advice. Rules change; check your local regulator, utility and landlord before buying. Savings are estimates, not guarantees. Install only certified products per the manufacturer's instructions.

10. Step by step: from unboxing to first power

Check the rules for your country/state and your lease (sections 6 and 8).
Pick the spot: sunniest place, little shade, near a fixed outdoor or indoor socket.
Unbox and inspect: panels, inverter, cables, mount; look for damage and the certification labels.
Mount the panels on the railing, stand or wall bracket. Tighten everything.
Mount the inverter in shade, off the ground.
Connect panels to the inverter (MC4 plugs click together) with the AC side unplugged.
Plug the AC cable into the wall socket, directly.
Wait a minute or so; the inverter checks the grid and starts.
Open the app (if any) and confirm watts are flowing.
Register/notify where required (Germany MaStR within 1 month; Austria 2 weeks before; UK DNO; some US utilities).
Note your meter reading and track savings monthly.

11. Adding a small battery

A battery stores midday power for the evening, which raises the share you use yourself. Units like the Anker SOLIX Solarbank 3, Jackery SolarVault 3, BLUETTI Balco and EcoFlow STREAM Ultra combine battery and inverter.

Evenings: yes, that's the main benefit.
Power cuts: the grid-tied output switches off in a blackout. Only models with a separate off-grid/backup socket can power devices plugged into that socket. Check the spec.
Cost: a battery adds cost and usually lengthens payback. Run the checker with a higher self-use share and the higher cost to compare.
UK: the current specification does not cover batteries with plug-in solar devices.

12. How to read your bill to see the savings

Find the unit rate (price per kWh). That's the number to put in the checker. Ignore the standing/daily charge; solar doesn't change it.
Compare kWh used month by month against the same month last year.
If you have time-of-use rates, daytime kWh are what solar cuts.
With a two-way meter, an "export" line may appear; usually unpaid for plug-in kits.
Take a meter photo the day you switch on, then monthly.

13. Myths, debunked

"It doesn't work in winter." It does, but less: in Berlin December gives about 28 kWh per kW of panels against 133 in June (PVGIS). Cold itself doesn't hurt panels; short days and low sun do.
"It damages the grid." Limits like 800 W exist so the current stays well within normal circuit ratings, and certified inverters switch off when the grid fails (anti-islanding).
"It's ugly." All-black panels exist, and placement is up to you; landlords in Germany can set how it's mounted.
"You need a roof." No. Balcony railings, gardens, walls and flat roofs all work. Vertical railings make about 70% of what an ideal tilt makes in Berlin (PVGIS).

14. Environmental impact

The checker multiplies your yearly kWh by the official grid emission factor where we have one: Germany 344 g/kWh (UBA 2025), US 348 g/kWh (EPA eGRID2023), UK 131 g/kWh (DESNZ 2026), Austria 55, Netherlands 235, France 43, Spain 129, Italy 180 (EEA 2024), Australia NSW/ACT 640 g/kWh (NGA 2025) and South Africa about 1,040 g/kWh (derived from Eskom's 2025 report). It doesn't count the emissions from making the panels. Cleaner grids (France, Austria) mean less CO2 saved per kWh.

More on homemadegenerator.com: Why is my electric bill so high?

FAQ

What is plug-in (balcony) solar?

A small solar kit, usually one to four panels and a microinverter, that plugs into a normal wall socket. It feeds power into your home's wiring, so appliances running at the same time use it first and you buy less from the grid.

Is plug-in solar legal?

It depends on where you live. Germany and Austria allow up to 800 W, Great Britain has allowed compliant 800 W devices since 27 August 2026, and 10 US states have passed laws (6 in force by October 2026). Australia and New Zealand do not allow it yet. Always check your local rules.

How much can a plug-in solar kit save?

It depends on sunlight, panel direction, shading, your electricity price and how much of the power you use as it is made. Use the checker on this page with your own bill rate. Results are estimates, not promises.

Does plug-in solar work during a power cut?

No. By design the microinverter switches off when the grid goes down (anti-islanding), so it cannot back-feed lines that utility workers may be repairing. Only a battery system with its own backup outlet can supply power in an outage.

Can I plug it into an extension cord or power strip?

No. Austria's regulator, Germany's Umweltbundesamt and manufacturers such as EcoFlow say to plug directly into a fixed wall socket, never a power strip or extension cord.

Do I need permission as a renter?

Usually you need to ask. In Germany, since 17 October 2024, landlords can only refuse in exceptional cases. In the UK you may need landlord or freeholder permission. Some US laws protect renters (Vermont, Colorado, Virginia, New Jersey); most do not.