All guides

Answers to the most common questions

Is a home battery worth it?Prices per kWh, self-consumption with and without a battery, a worked example for 10 kWp and a rule of thumb for when a battery pays off.
Bidirectional charging: what works in Switzerland?V2H and V2G in Switzerland: what is allowed, which cars and wallboxes can do it, what the pilot projects showed and what you can provide for when installing an EV charger today.
Hail damage to a solar system: what to do?What to do after hail, how to report and document the damage and who pays: cantonal building insurance or a private policy.
In-roof or on-roof?Cost, look, yield, watertightness, subsidies and permits: when an in-roof solar system makes sense and when on-roof remains the better choice.
EV charger: 11 kW or 22 kW?Wallbox 11 kW or 22 kW in a single-family home: what the car accepts on AC, how long charging takes, what the cable costs and who has to agree.
EV charger with a solar system: charging with your own roof powerHow to charge your electric car with your own solar power: surplus charging, wallbox, battery and a calculation with 10 kWp, 15,000 km a year and grid power at 27.7 ct.
What is a local electricity community (LEG)?Possible since 1.1.2026: share solar power over the public grid with a reduced grid fee. Requirements and the difference from ZEV and vZEV.
Air-to-water or ground-source: which heat pump fits?Cost, seasonal performance factor, permits, noise and space: when drilling for a borehole pays off and when the air-to-water heat pump is the better choice.
Do I need a permit for my solar system?When is the notification under Art. 18a RPG enough, and when do you need a building application? Requirements, historic cores, protected buildings and process.
A solar system on a flat roofEast-west or south, tilt, ballast and structure, green roofs and permits: what matters for a solar system on a flat roof.
What subsidies are there for a solar system?One-off payment from Pronovo, tax deduction, feed-in tariff and cantonal grants. With a worked example for a 10 kWp system.
How long does a solar system last?Lifespan of modules and inverter, what maintenance means, what monitoring is for and what to bear in mind with insurance.
Photovoltaics on the facadeWinter electricity, VKF fire protection, one-off payment for integrated systems and the notification procedure: what architects clarify for a solar facade.
What subsidies are there for a heat pump?Who subsidises the heat pump, why you apply before building starts, how the tax deduction works and where to find the amounts for your canton.
Heat pump with solar system: is the combination worth it?How much of your heating electricity your roof supplies, why grid power remains in winter and what to watch for in size, storage and control.
What does an EV charger cost?What a wallbox costs in a single-family home: unit, cable, registration, possible subsidies and electricity cost per 100 km, with grid and with solar power.
What does a solar system cost?Prices by system size, cost items, one-off payment and tax deduction. With a worked payback example for a single-family home.
Solar power: your own roof or a green tariff?Buy green or nature power from the utility, or generate your own? Difference, self-consumption, feed-in tariff, guarantees of origin and ZEV.
What does a heat pump cost?Air-to-water or ground-source: what a heat pump costs in a single-family home, how much electricity it uses and when it pays off against oil heating.

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