Balcony solar kit in 2026: output, price and real financial return

What is a balcony solar kit?

A balcony solar kit, or “plug & play solar station”, is a miniature photovoltaic installation designed to be set up and plugged in by yourself, with no installer and no building work. It typically consists of one or two panels (400 to 500 Wp each), a built-in microinverter that converts direct current into 230 V, and a cable ending in a household plug that you connect to a wall socket.

The electricity produced instantly powers the appliances in the home. It “flows back” from the socket to the electrical panel and mixes with the current from the grid: your appliances draw on solar power first, and your meter spins less. This is the principle of self-consumption, applied on a very small scale.

What sets a balcony kit apart from a real installation

The difference is not only a matter of size. A plug & play kit does not export paid electricity to the grid, entitles you to no bonus, and involves no buy-back contract. It does not replace a rooftop installation: it foreshadows one, at lower cost and lower risk.

Is it legal in France?

Yes, a balcony kit is perfectly legal. But “legal” does not mean “without any formalities”. Three points deserve your attention.

1. Declaration to Enedis (free, mandatory)

Even if your kit exports nothing to the grid, you must declare the installation to Enedis, the grid operator, through a Self-Consumption Without Injection Agreement (CACSI). It is free, done online, and makes it official that your production is entirely self-consumed. This step protects your liability and avoids any dispute with the grid operator.

2. Electrical safety (NF C 15-100 standard)

Connecting to a household socket is tolerated, but it must comply with the NF C 15-100 standard. In practice: never a power strip or an extension lead, ideally a dedicated circuit protected by its own circuit breaker, and a socket in good condition. The power of “plug” kits is deliberately limited (around 800 W) to stay within safe use on a standard circuit.

3. The difference from the German Balkonkraftwerk

Germany created a specific framework (simplified registration, a clearly defined 800 W ceiling, Schuko plug allowed). In France there is not yet a dedicated regulatory status for a “balcony kit”: ordinary self-consumption law applies. In practice, this means a little more vigilance over the declaration and safety, but nothing blocking for a household.

How much does it really produce?

This is THE question that sellers gloss over. A balcony panel is almost always mounted vertically, flat against the railing, which is the least favourable orientation. We calculated the output of an 800 Wp kit from PVGIS satellite data (the European Commission's official engine), in three cities and for two mounting positions.

Annual output of an 800 Wp kit facing due south, system losses 14%, PVGIS v5.3 data.

Two other factors weigh heavily on a balcony: the imposed orientation (a due-north balcony halves the output, and there is little you can do about it) and the shading from neighbouring buildings, often significant in cities. The figures above assume an unobstructed south-facing exposure: adjust them downwards according to your real situation.

How much does it earn?

Unlike a rooftop installation, a balcony kit sells nothing. There is neither a surplus buy-back by EDF OA nor a self-consumption bonus (itself abolished in June 2026). All the value comes from one thing only: the electricity you no longer pay your supplier for, at 0.2001 €/kWh.

Good news: a small kit has a very high self-consumption rate. Its low power (800 W at most) is almost always absorbed by appliances on standby or running continuously: fridge, internet box, standby loads, lighting. We prudently assume 85% self-consumption.

Price and honest financial return

In 2026, a plug & play balcony kit with 2 panels (~800 Wp) sells for between 400 and 700 € incl. VAT, microinverter included. Single-panel kits (~400 Wp) start at around 200 €. Be careful: bought online and installed yourself, the kit is subject to 20% VAT; the reduced 5.5% VAT applies only to installations fitted by an RGE-certified professional (French quality label).

The financial return of a balcony kit has a particular signature: a short payback period (3 to 5 years thanks to the low cost and high self-consumption), but a modest absolute gain (100 to 200 €/year). Over 20 years, a well-exposed kit earns a few thousand euros net: useful, but nowhere near a rooftop installation.

Limits and pitfalls

A balcony kit remains an excellent supplementary product, provided you go in with your eyes open about its limits.

• Imposed orientation. You do not choose the orientation of your balcony. If it faces north or is heavily shaded, output collapses: measure before you buy.
• Fixing and wind. A poorly secured panel on a railing at height is a danger. The fixing must withstand gusts; in a tall building, this is a non-negotiable point.
• Joint ownership and renting. General meeting approval for any visible change, landlord's approval if you rent. Do not fix anything without it in writing.
• Electrical safety. A dedicated circuit if possible, never a power strip, a socket in good condition. If in doubt, have an electrician check it.
• No surplus income. Anything not consumed at the moment it is produced is lost. The kit must be sized for your daytime consumption.

Balcony kit or conventional installation: who is each for?

The two solutions do not address the same profile. Here is how to decide.

Unsure, or want to put numbers on your specific case, whether a flat's balcony or a house's roof? Our free simulator combines your actual consumption with the weather data for your address, hour by hour. To test a specific use (fridge, internet box, small appliances) with one or two panels, the solar kit tool is made for that.

Frequently asked questions