Sonnwende GmbH

What Sonnwende GmbH does

Sonnwende GmbH is a Swiss solar energy installer founded in 2023 and headquartered in Basel. The company plans, sells, and installs photovoltaic (PV) systems for residential and commercial customers in the Basel/NWCH region, offering both Aufdach (on-roof) and Indach (in-roof) configurations, along with building-integrated options such as solar carports, noise barriers, and balcony railings. Its product stack bundles PV with battery storage (Fronius, Tesvolt, salt-water options), smart E-Ladestationen / wallboxes (Easee), and energy management software (SolarManager, Smart Me, egonline), with regenerative heating (heat pumps, wood heating) provided through sister company LWS GmbH in Therwil under a holding structure created in July 2024.

The business operates on a project-based, one-time-sale revenue model with quote-based pricing (50% on order, 40% on completion, 10% on acceptance). It serves two primary customer segments — residential property owners (B2C) and business / commercial customers (B2B) — using a consultative sales motion anchored by a public Solarrechner lead-generation tool, a one-person project leadership GTM model, and partnerships with architecture offices, electricians, roofers, and Microlino for E-mobility cross-selling. Sonnwende is a certified Swissolar SolarProfis installer, holds the Solar Experte label from IGQ (2025), and operates a Lehrbetrieb apprenticeship program with Alteno Solar AG to train Solarinstallateur:in and Solarmonteur:in apprentices.

Name

Sonnwende GmbH

Legal name

Sonnwende GmbH

Website

https://sonnwende.ch

Company type

Private

Founded year

2023

Operating status

Operating

Headcount range

11–50 employees

Short description

Sonnwende GmbH is a Basel-based Swiss installer of photovoltaic systems, battery storage, EV charging, and integrated energy management for residential and commercial customers, with regenerative heating offered through sister company LWS GmbH.

Ownership category

akta.pro rank

Product category

Solar Installation Services

akta.pro primary industry

Solar EPC & Construction (Utility-Scale, Rooftop, Balance of System) (EUAMABAB)

akta.pro secondary industries

Renewable Distributed Generation (Rooftop/Onsite Solar, Small Wind, Small Hydro) (EUACALAJ), Solar Roofing & Roof-Mounted PV Systems (IMADAFAO)

Keywords

• Solar installation services
• Photovoltaic systems
• Heat pump solutions
• Ev charging infrastructure
• Renewable energy consulting

Headquarters

HQ city

Basel

HQ country

Switzerland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Solar Installation Services: One-time installation of photovoltaic systems including on-roof, in-roof, and facade-mounted configurations. Includes planning, advisory, administrative support for subsidies, and installation by their own montage teams.
2. Battery Storage Systems: Sale and installation of solar battery storage systems including lithium and salt-based storage solutions to optimize self-consumption.
3. E-Mobility Charging Solutions: Installation of smart E-charging stations with integration to PV systems and energy management for optimized solar charging of electric vehicles.
4. Heat Pump Systems: Through sister company LWS GmbH, provides regenerative heating systems including heat pumps and wood heating systems for sustainable building heating.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels8 records

Core offering

Sonnwende GmbH plans, installs, and maintains photovoltaic solar systems (rooftop and building-integrated), battery storage, smart EV charging stations, and integrates renewable heating solutions for residential and commercial customers in the Basel region of Switzerland. The company delivers full-service projects from initial consultation and subsidy application through installation by its own Montageteams to commissioning, supported by an in-house Solarrechner tool that generates personalized quotes.

Product overview

Sonnwende GmbH offers a comprehensive renewable energy portfolio centered on photovoltaic systems as the core product. The company provides rooftop-mounted (Aufdach) and building-integrated (Indach) solar installations, complemented by battery storage systems (Solarstromspeicher), smart EV charging stations (E-Ladestationen), and energy management solutions (Energiemanager). The product ecosystem also includes solar-integrated structures (carports, noise barriers, balcony railings) and integration with heat pumps for sustainable heating. A proprietary Solarrechner tool enables customers to calculate personalized quotes. The company serves both residential and business customers (Geschäftskunden) with tailored solutions including ZEV (energy community) projects. LWS GmbH, a sister company since July 2024, handles heat solutions while Sonnwende focuses on solar energy and e-mobility.

Differentiator

Problem solved

Functional benefit

Products and services

• Photovoltaik (PV-Anlagen)
• Solarstromspeicher (Batteriespeicher) Battery storage systems that store excess solar power for use during nighttime or low-production periods, available in various sizes and technologies including lithium-based and salt-water (Salzspeicher) options without lithium.
• E-Ladestationen (Wallbox) Smart EV charging stations (wallboxes) that integrate with PV systems and energy managers, enabling intelligent solar-optimized charging of electric vehicles.
• Wärmepumpen-Integration (Heat Pump Solutions) Integration of heat pump systems for renewable heating, coordinated with solar installations to maximize overall energy efficiency and self-consumption, delivered via sister company LWS GmbH.
• Geschäftskunden-Lösungen (Business Customer Solutions) Tailored PV, heat, and e-mobility solutions for businesses and cooperatives, including special programs for stock ownership communities (ZEV) and commercial installations with attractive depreciation benefits.
• Solarrechner (Solar Calculator Service) Online service that simulates solar installations using high-resolution satellite maps, local electricity tariffs, and heating systems to produce an unverbindliche (non-binding) personalized quote for prospective solar customers.

Quantifiable outcome

• PV systems can operate for more than 25 years reliably
• +2 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature3 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• LWS GmbHcoreStrategic or Co-development PartnerSince July 2024, LWS GmbH (Therwil) became a sister company under a newly formed holding structure. LWS specializes in regenerative heating systems (heat pumps, wood heating). The partnership enables combined PV + heating solutions under one coordinated approach, with Joakim Schibler (co-founder of Sonnwende) leading LWS. LWS has 10 employees and 24 years of experience.
• SwissolarminorOthersSwiss industry association for solar energy. Sonnwende is a member and uses Swissolar's arbitration service (Ombudsstelle Swissolar) for dispute resolution per their AGB.
• Gewerbeverband BaselminorOthersRegional trade association in Basel for small and medium enterprises.
• SuissetecminorOthersSwiss technical trade association for building technology.
• SES (Energiestiftung)minorOthersSwiss Energy Foundation promoting sustainable energy solutions.
• SSES (Schweizerische Vereinigung für Sonnenenergie)minorOthersSwiss Association for Solar Energy, promoting solar energy adoption.
• zRächtCho NWCHminorStrategic or Co-development PartnerPartnership to support employment of people with refugee backgrounds, helping them integrate into Swiss society through job opportunities at Sonnwende.
• CasafairminorOthersAssociation promoting fair construction practices.
• Solarinfoschweiz / SolarexperteminorGTM or Marketing PartnerPartner providing solar information services and certification as Solar Expert.
• PVShareminorGTM or Marketing PartnerPlatform for sharing PV installations and solar energy.
• MicrolinominorGTM or Marketing PartnerPartnership with Microlino for E-mobility: Fresh Microlino drivers receive free PV consultation and 10% partner discount on solar and E-charging solutions; Sonnwende PV customers can test drive Microlino and receive 10% discount on purchase. Stefan Bucher is the contact.
• Alteno Solar AGminorStrategic or Co-development PartnerPartner for solar training programs; Alteno Solar AG is starting apprenticeships for Solarmonteur:in and Solarinstallateur:in professions at Sonnwende's facilities.

Scale indicators1 record

Recent moves7 records

Expansion highlights6 records

Market position

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/sonnwende.ch
• LinkedInlinkedin.com/company/sonnwende-ch
• Instagraminstagram.com/sonnwende.ch

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sonnwende GmbH