· 5 min read · By Hotsolar engineering team
A balcony solar kit is one or two panels with a small inverter that attach to your railing and supply electricity to your home. Germany has more than 1.3 million registered, even though each panel there produces quite a bit less than in Andalucía. If you live in a flat or rent, it's the simplest way to start saving with the sun.
The German phenomenon
In Germany they call them Balkonkraftwerk, "balcony power station". According to the official German register of installations (Marktstammdatenregister), in May 2026 there were about 1.33 million balcony kits in operation. The real number is higher, because not everyone registers them.
The rules have helped a lot. In 2024 Germany simplified registration and raised the inverter power limit to 800 W. And since most people there rent, a kit that needs no building work is a very good fit.
Why it makes even more sense in Spain
In Seville, each kWp of panels produces about 1,600 kWh a year; in Germany, roughly 1,000. The same kit produces around 60% more in Andalucía.
On top of that, in Spain many people live in flats without a roof of their own, and for them the balcony is the only space available.
How it works
The panels attach to the railing, the wall or the balcony floor, facing the best possible direction (south, south-east or south-west). A microinverter converts their energy into the same kind of current your home uses, and the home uses it straight away: the fridge, the router, the computer, or the washing machine if you run it during the day.
A balcony kit mainly covers your base load, the electricity used by appliances that are always on. That's why almost everything it produces gets used.
How much it saves in Andalucía
With a 400 Wp kit in Seville or Málaga:
| Without battery | With battery | |
|---|---|---|
| Production per year | 250 to 450 kWh | 250 to 450 kWh |
| Savings per year (approx.) | €25 to €60 | €35 to €85 |
Indicative estimate at electricity prices of €0.15 to €0.20 per kWh. Real savings depend on orientation, shading and your habits. With a battery you can also use the sun's energy in the evening and at night.
The savings are smaller than with a rooftop system, but so is the investment, and there's no building work.
Advantages for consumers in Spain
- No building work: you don't permanently touch the roof or the façade.
- It works in flats and penthouses where a rooftop system isn't possible.
- If you rent and move, you take it with you.
- What it produces is used straight away, so you save from day one.
- You can see what you produce on your phone, which helps you understand your consumption before considering something bigger.
What Spanish regulations say
Spain doesn't yet have its own legal category for balcony kits, as Germany does. The general self-consumption rules apply.
Under Real Decreto 244/2019 (Royal Decree 244/2019), if the kit exports energy to the grid, however little, it counts as self-consumption with surplus and must be entered in the regional self-consumption register. The technical requirements are set by ITC-BT-40 of the Spanish low-voltage electrical regulations, which for installations with surplus require a dedicated circuit: you can't just plug it into any extension lead. The installation certificate is signed by an authorised installation company.
Beyond the electrics, check your community of owners' statutes, because some restrict changes to balconies and façades. And depending on the municipality, the town hall may ask for prior notice or nothing at all.
It's legal, but it has to be done properly. We choose a kit with a certified inverter, check your electrical installation and handle the paperwork. This is general information, not legal advice.
Mistakes to avoid
- Putting it on a north-facing or heavily shaded balcony: it will produce very little.
- Fixing it with improvised brackets. In the wind a panel acts like a sail; use brackets designed for railings.
- Buying inverters without European certification.
- Plugging it into an extension lead instead of a suitable point in your installation.
Frequently asked questions
Do I need permission from the community of owners? It depends on the statutes and on whether the kit changes the façade. We check this with you before installing.
Does it work on an east- or west-facing balcony? Yes, although it produces a little less than facing south. Facing east it produces in the morning and facing west in the afternoon.
Can I add more panels later? Up to a point, yes. If you want a lot more power, a rooftop system or shared self-consumption in your building will probably be better value.
Ask for information
We'll advise you, with no obligation, on the kit that suits your balcony. There are more details on our balcony solar page, or you can message us on WhatsApp.
Sources
- Deutscher Presseindex: more than 1.3 million balcony kits in the German register (August 2026, in German)
- BalconWatt: legality of plug-in solar kits in Spain (in Spanish)
- Hotsolar production estimates using PVGIS data (European Commission)
