Balcony solar in Switzerland: why 600 W still applies
Switzerland still follows the 2014 ESTI rule of 600 W per circuit. A federal report of February 2026 proposes new categories that include small batteries.
The current rule
In Switzerland, ESTI Bulletin 7 of 2014 still applies: at most 600 W AC per circuit behind a meter, residual current monitoring in the inverter, and a written notice to the grid operator before you start using the system. Many kits sold in Europe have 800 W inverters. An 800 W inverter limited to 600 W by software has reportedly not been accepted as a 600 W device, so check with ESTI or your operator before you rely on it.
What the 2026 federal report proposes
A report for the Swiss Federal Office of Energy, prepared with the Bern University of Applied Sciences and Electrosuisse and published on 28 February 2026, found no known damage or injuries caused by balcony systems. It puts the technical potential at 3.01 TWh per year. It recommends a new Swiss guideline with two categories: single phase systems with up to 2,000 W DC and 800 W AC, and three phase systems with up to 6,000 W DC and 2,400 W AC, both including small batteries. For now this is a proposal, and the 600 W rule remains in force.
What to do now
Buy an inverter rated at 600 W, or one your operator confirms in writing. Send the notice before you plug in. If you are waiting for a battery, compare models now but keep the receipt and the operator's answer, because the categories may change. Prices in Switzerland are often higher than in neighbouring countries, so compare the same model across markets on our product pages once they are available.