{"id":33440,"date":"2026-06-10T08:32:13","date_gmt":"2026-06-10T06:32:13","guid":{"rendered":"https:\/\/www.victronenergy.com\/blog\/?p=33440"},"modified":"2026-06-10T08:32:13","modified_gmt":"2026-06-10T06:32:13","slug":"community-generates-four-times-the-energy-it-consumes","status":"publish","type":"post","link":"https:\/\/www.victronenergy.com\/blog\/2026\/06\/10\/community-generates-four-times-the-energy-it-consumes\/","title":{"rendered":"Community generates four times the energy it consumes"},"content":{"rendered":"

Viewed from the village square, Alte Schmitte<\/em> appears to be an ordinary residential neighbourhood. PV modules are integrated into roofs and fa\u00e7ades rather than added as separate elements, allowing the buildings to exhibit a cohesive architectural appearance.<\/p>\n

Behind that appearance, however, is an energy system that enables twenty-seven households to live in a community which generates far more electricity than it consumes. More than four times as much, in fact.<\/p>\n

The community is in the Swiss village of G\u00fcttingen which lies on the shores of Lake Constance. A former smithy – Alte Schmitte –<\/em>was redeveloped into an energy-efficient residential neighbourhood. The development consists of six buildings: four are newly-constructed timber buildings, two are historic houses which have been renovated. Together they provide 27 rental apartments in the centre of the village – new housing which preserves the character of its village location between the church and community centre.

\"\"<\/div><\/a><\/p>\n

The project received both the Norman Foster Solar Award from the Swiss Solar Prize and the European Solar Prize 2025 in the category of Solar Architecture and Sustainable Design.<\/p>\n

With high levels of energy efficiency the buildings use a Minergie-P building envelope, sheep’s wool insulation, geothermal heat pumps and passive cooling. Minergie-P is a Swiss building certification similar to Passivhaus.<\/p>\n

The solar based power system was designed, programmed and is maintained by Solar Energy Anstalt<\/a>.<\/p>\n

The photovoltaic array measures more than 3000m\u00b2 and provides 413.7 kWp of generation capacity across roofs, balconies and building fa\u00e7ades. The annual electricity production from these panels is 371,000 kWh, yet annual energy demand from the twenty seven occupancies is around 92,400 kWh – most of the surplus energy is exported to the public grid.<\/p>\n

Six MultiPlus-II<\/a> 48\/15000 inverters configured for three-phase supply provide 90 kVA of power. They’re sized for peak loads, rather than annual kilowatt-hours. In off-grid mode, whenever the grid has failed, this architecture is designed to supply priority loads via a separate emergency power sub-distribution system: that ensures continuity of building services, elevator, ventilation, control systems, lighting, security, and access control.<\/p>\n

It’s important to note that when the grid fails the MultiPlus-II inverters make the switch to private supply in under 20 milliseconds\u2014faster than a conventional UPS.<\/p>\n

\"\"<\/div><\/a>Charge Control of the extensive solar arrays is provided by numerous Solar Charge Controllers including the SmartSolar MPPT RS<\/a> 450\/200, SmartSolar MPPT 250\/70<\/a>‘s, and SmartSolar MPPT 150\/20<\/a>, models. Groups of charge controllers are daisy-chained to provide synchronised battery charging as the sun-shadow moves around the development.<\/p>\n

In practice, this configuration allows between 100 to 140 MWh per year to be generated by day yet used in the evening and overnight, allowing a self-consumption percentage of between 55\u201370%. And in the event of a power outage, the 400kWh Pytes battery bank can easily power the neighbourhood’s prioritised services for a full day and night.<\/p>\n

The Pytes batteries and Cerbo GX<\/a> are connected by a VE.Can-to-CAN-bus BMS cable. All battery-side data flows into the Victron system and from there to the Victron Remote Management VRM Porta<\/a>l for remote access, alerts, and long-term logging.<\/p>\n

\"\"<\/div><\/a><\/p>\n

Technical support and system integration were provided by Franz (Solar Energy), the Victron sales partner for the project. Project management was handled by Fabrice from the architectural firm Giuseppe Fent AG<\/a>.<\/p>\n

Integration of the Pytes battery system with Victron technology; configuration of battery communications, Fronius PV inverters are controlled by the MultiPlus II’s for charging the Energy Storage System (ESS); \u00a0and provision for data collection and long-term monitoring has been enabled for the Zurich University of Applied Sciences ZHAW Winterthur<\/a> have all be commissioned and are running successfully.<\/p>\n

\"\"<\/div><\/a>Timber construction and fa\u00e7ades made from Swiss silver fir were chosen as part of the overall design approach. Near Vertical mounted solar panels seem to contribute well to the clean aesthetic without detracting for the timber frame. Both the buildings and their technology fit easily into their historic setting.<\/p>\n

Images are by Julian Schmelz Inger.<\/p>\n","protected":false},"excerpt":{"rendered":"

Viewed from the village square, Alte Schmitte appears to be an ordinary residential neighbourhood. PV modules are integrated into roofs and fa\u00e7ades rather than added as separate elements, allowing the buildings to exhibit a cohesive architectural appearance. 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