Feedback after 1 year of autarky

Studer and Smartsuna share their feedback from the field after the first year of implementation of the solar autarky concept for residential applications in Switzerland. The fact of being able to switch from thermal mobility to real solar mobility is also a factor in the decision. In 2023, the autarky concept expands to buildings and SMEs. A new application to popularize the autarky model and a future virtual power plan business model, the Swiss made autarky concept drafts a potential market of 100M CHF per year where homeowners, public organism, real-state, and SMEs can contribute to the energy transition.


2022 has been a year of great debate around energy in Switzerland as in many other places around the world. The politic agenda oriented towards the preparation of emergency plans in case of potential energy shortages. In Q4 2022 a general electricity price increase was announced. This has created many uncertainties for homeowners and how the situation should impact their energy supply.


Also in 2022, the electric mobility kept boosting, with a market that has doubled in Europe according to the European Automobile Manufacturers’ Association (ACEA). In Switzerland the heat pump technology has quadrupled since 2010 and represents 75% of the heating solutions installed in residential applications since the last decade (source: Swiss Federal Statistical Office FSO). The electrification of end-use consumption is a trend representing an important electrical demand increase for houseowners in order to be more efficient in terms of their energy consumption


and align with their willingness of reducing their carbon footprint. With that situation, many houseowners have questioned themselves what should be their energy strategy for the next years. Studer and Smartsuna introduced in 2022 a new concept of solar autarky that has been very successful.


Your house, your own electrical production site


With most of the solar installers proposing standard solar rooftops installations, the energy is produced just during the time the demand is lower for residential applications. Without storage, the excess of non-used energy is re-sold back to the grid at a low price. During the night all the energy is taken from the grid. In addition, this solution does not provide backup during a blackout.


With a smart solar autarky installation, the client benefits from a battery that stores the non-used energy, providing a great flexibility in the use. In case of grid failure, the system continues to supply energy. An annual autarky rate between 60-85% is easily achievable and the impact of fluctuation in electricity prices is therefore negligible. This high level of independence provides financial security against fluctuating electricity prices.


A stand-alone energy management system

Connected to photovoltaic panels, the batteries and inverter provide intelligent energy management.


The autarkic home


With a system consisting of around 15-20kW of solar rooftop, between 15-30 kWh of batteries and 1 next3 16kW 3-phase smart inverter, a house becomes autonomous in terms of electricity. With an initial investment that can go up to 2 times the cost of a standard solar system, mostly because of the initial cost of the storage, a homeowner can ensure the electrical supply for the next decades, with an electrical bill close to 0. Investment return rates below 10 years are easily achievable, with the support of regional subsidies and tax deductions. Furthermore, the power electronics are 100% Swiss Made by Studer, a very powerful device ready for the new market applications, with an extraordinary 15-year warranty period and reparable for the peace of mind of the clients.

Another differential factor is that combining an autarkic home with the electric mobility, the houseowners benefit from a solar pump directly at home. This is a game changer especially in terms of transportation and ecological cost replacing a thermal combustion car.


Self-sufficient villas

Two neighbouring villas with smartsuna systems for solar self-sufficiency


365 days, four seasons feedback from the field


Many bright indicators from the above were collected during the several installations of autarkic homes in the French-speaking Switzerland implemented by Smartsuna in 2022.


Autarky rates of 98% in two autumn days (17-18/10) with solar energy supplying 200km of solar mobility (30kWh), 28kWh of direct energy consumption and 24kWh of energy fed back to the grid, with a tariff that will compensate the energy consumed from the grid on less sunny winter days. The extra energy sold from spring to autumn offsets the cost of buying energy during the winter months, so this system guarantees that our electricity and mobility bills will be close to 0CHF, regardless of current and future energy prices.

Several owners are surprised to learn that their existing solar installation stops working in the event of a power cut. 20% of Smartsuna projects in 2022 consisted of installing a next3 and storage in order to switch to the solar autarky.


The autarky model for buildings and SMEs


The success of the residential solar autarky has served to raise awareness also for public organisms, real-state and SMEs, which are confronted to the same energy scenario.


The first 100% autarkic demonstration industrial and educational site in Switzerland, the AutarCity project will consist of 3000 m2 of solar rooftop and 6 next3 with batteries to supply the Studer factory and a municipal childcare facility and secure the production in case of interruptions in the electrical supply.

“Solar autarky will enable us to decarbonise our factory and the mobility of our employees. What’s more, thanks to our energy conversion and storage technology, we will be able to drastically reduce our electricity bills and secure the essential operation of the factory in the event of a power cut” Loïc Viret, CEO of Studer Innotec. “We are delighted to be able to move from the tried and tested model of the self-sufficient solar home to that of the self-sufficient factory, and thus meet the expectations of the market,” says Julien Morard, CEO of Smartsuna.

Studer factory

The autarky model applied to SMEs or public organisations


A bright future ahead of us


In Switzerland we are fortunate to have one of the most powerful solar sector in the world. The Swiss innovation DNA as igniter of several startups and SMEs proposals for the future of the energy supply. The company 3S has been developing and producing solar modules in Switzerland for more than 20 years. At the forefront of technology, integrated solar solutions over the entire surface of any building envelope. Studer Innotec manufactures in Switzerland since more than 35 years the top-leading power electronics for offgrid installations around the globe. An example of a 100% Swiss made solution to secure our energy supply in the next decades.


The autarky model brings a wide range of options. Smartsuna is introducing an application to popularize the autarky model and approach it to everyone. The Smartsuna model is being developed in other neighboring countries such as France, Germany and Spain. And smartsuna team is already drafting the next business application of the autarky model. . By grouping several autarky installations in a virtual power plant (VPP) it is possible to participate in the grid management and bring a powerful, innovative asset with full flexibility.


2023 is the year to validate the autarky model also for buildings and SMEs. A great step towards the energy transition, Studer and Smartsuna bring their Swiss made autarky concept to a potential market of 100M CHF per year where homeowners, public organism, real-state, and SMEs can contribute to the energy transition.


About Studer

Studer is a manufacturer of high-end power electronics for off-grid, on-grid and hybrid applications. World leader in its domain, Studer has been offering reliable solutions for more than 35 years. The last power conversion equipment manufacturer with 100% of the production chain in Europe.

About smartsuna

A startup created by Studer, providing digital and engineering services to facilitate access to the autarky technology for the general public, but also for companies wishing to shift their way of consuming and/or producing electrical energy.


Julien Morard, CEO smartsuna and Loïc Viret, CEO Studer



Loïc Viret, CEO Studer Innotec and founding member of the board of directors of smartsuna


Julien Morard, CEO Smartsuna


Studer Innotec SA
rue des Casernes 57, 1950 Sion, Suisse │+41 27 205 60 80

Smartsuna SA
rue des Casernes 57, 1950 Sion, Suisse │+41 27 205 60 86