About Sonnen
Sonnen is an Energy & Utilities company based in Wildpoldsried (Germany) founded in 2010 by Torsten Stiefenhofer, and was acquired by Atrato Onsite Energy in October 2022. Provider of solar integrated power storage system. Sonnen has raised $168.42 million across 7 funding rounds from investors including Shell, eCapital and Envision Group. Sonnen has completed 1 acquisition, including Webatt Energy. Sonnen offers products and services including sonnenBatterie and Smart Energy Solutions. Its focus areas include Energy Tech, Energy Storage Tech, Energy Storage System and Lithium Iron Phosphate. Its legal entity is sonnen GmbH.
Company details
Sonnen was founded in 2010 in Wildpoldsried, Germany, as a provider of solar-integrated energy storage solutions in the renewable energy sector. Systems for residential and commercial applications are offered, including eco, hybrid, and pro series that integrate with fuel cells and wind turbines, featuring built-in inverters. Energy consumption is monitored and controlled via a mobile application. Additional offerings include solar water heaters, power backup systems, and e-vehicle charging solutions.
- Headquarters Wildpoldsried, Germany
- Founders Torsten Stiefenhofer
- Stage Acquired
- SectorsEnergy & Utilities
- Website sonnengroup.com
- Social LinkedIn X Facebook
- Acquired by Atrato Onsite Energy (Oct 2022)
- Legal Name Sonnen Gmbh
- Annual Revenue$132.91 M (USD)41as on Dec 31, 2021
- Net Profit-$6.11 M (USD)-198as on Dec 31, 2021
- EBITDA-$6.11 M (USD)-198as on Dec 31, 2021
- Total Equity Funding$168.42M (USD)
in 7 rounds
- Latest Funding Round$28.5M (USD), Debt – Conventional
Jan 2019
- InvestorsShell
& 10 more
- Investments & Acquisitions
- Acquired by
Products & Services of Sonnen
Sonnen offers a comprehensive portfolio of products and services, including sonnenBatterie and Smart Energy Solutions.
Intelligent battery system for storing renewable energy at home.
Hardware and contracts for efficient sustainable energy use.
Funding Insights of Sonnen
Sonnen has successfully raised a total of $168.42M across 7 strategic funding rounds. The most recent funding activity was a Debt – Conventional round of $28.5 million completed in January 2019. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $168.42M
- Total Rounds 7
- Last Round Debt – Conventional — $28.5M
- First Round $3.3M
(Jan 2013)
- Investors Count 10
All 7 funding rounds of Sonnen with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jan 2019 | $28.5M | Debt – Conventional | – | – | |
| May 2018 | $70.72M | Series C | – | Shell | |
| Oct 2016 | $85M | Series C | – | – | |
| Jun 2016 | Series C | – | General Electric | – | |
| Jul 2015 | Series B | – | Inven Capital | – | |
| Dec 2014 | $9.4M | Series B | – | Munich Venture Partners, SET Ventures | |
| Jan 2013 | $3.3M | Series A | – | – |
11 investors in total: 10 institutional and 1 angel.
Investors in Sonnen
Sonnen has secured backing from 11 investors, including venture fund, institutional, and angel investors. Prominent investors backing the company include Shell, eCapital and Envision Group.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Finance and advisory services for infrastructure projects are provided. | 1958 | eib.org | Luxembourg, Luxembourg | |
Venture capital investments are directed toward Germany and the US. | munichvp.com | Munich, Germany | ||
Investments are directed toward early-stage energy system companies. | setventures.com | Amsterdam, Netherlands | ||
Venture capital firm backed by CEZ Group | invencapital.cz | Prague, Czech Republic | ||
Tech startups are funded through eCAPITAL's venture capital investments. | ecapital.vc | Munster, Germany | ||
Shell is recognized as a global energy and petrochemical company. | 1907 | shell.com | London, United Kingdom | |
Wind energy projects are developed and managed by Envision globally. | 2007 | envision-group.com | Shanghai, China | |
Provider of asset-based, supply chain, and invoice financing solutions | 2006 | ecapital.com | Miami, United States | |
Diversified operations are conducted across multiple industries worldwide. | 1892 | ge.com | United States | |
TP Thomas Putter | Indian angel investor focusing on early-stage startups in tech and innovation. | unknown_add934c229c840fc9 |
Investor details for Sonnen
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
- Complete investor list
- Round participation
- Investor portfolios
- Co-investor network
Verified entity values are shown only after access is granted.
People of Sonnen
1 people are tracked at Sonnen (1 in leadership).
| Name | Role | Group |
|---|---|---|
Torsten Stiefenhofer | Co-Founder & CTO | Leadership |
Complete people profiles for Sonnen
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
- Full employee list
- Team structure
- Board tenure
- Professional contacts
Verified entity values are shown only after access is granted.
Investments & Acquisitions by Sonnen
Sonnen has strategically engaged in corporate development activities, having acquired 1 company. Notable acquisitions include Webatt Energy.
| Company Name | Description | Domain | Location | Founded | Acquired | Amount |
|---|---|---|---|---|---|---|
Solar power plant monitoring solutions are provided for residential use. | webatt.energy | Olot, Spain | 2017 | Jun 2022 | •••• |
Complete acquisition details for Sonnen
Acquired stakes, deal sources and the complete acquisition history require an active premium plan.
- Acquired stakes
- Deal sources
- Complete history
- Exports
Verified entity values are shown only after access is granted.
Timeline of Sonnen
6 dated milestones of Sonnen across 12 years, from founding to its latest funding, stage changes and deals.
- Founded Sonnen is founded.
- Funding First funding round of $3.3M.
- Funding Latest funding round, Debt – Conventional, of $28.5M.
- Exit Acquired by Shell.
- Acquisition Acquires Webatt Energy.
- Exit Acquired by Atrato Onsite Energy.
Web traffic of Sonnen
The website of Sonnen (sonnengroup.com) receives about 8K visits a month.
- Monthly visits8K
▲ 19.9% vs previous month
Websites whose visitors overlap most with Sonnen. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
sonnenusa.com | sonnenusa.com | 100% | #4,456,810 | – | |
sonnen.it | sonnen.it | 80% | #2,758,504 | – | |
| solarmarkt.ch | 79% | 111.2K | #300,029 | View details | |
sonnencommunity.ch | sonnencommunity.ch | 22% | #11,104,338 | – |
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Frequently Asked Questions about Sonnen
Sonnen was founded in 2010 and raised its 1st funding round 3 years after it was founded.
Sonnen is headquartered in Wildpoldsried, Germany. It is registered at Wildpoldsried, Bavaria, Germany.
Sonnen is a funded company, having raised a total of $168.42M across 7 funding rounds to date. The company's 1st funding round was a Series A of $3.3M, raised on Jan 2013.
Annual revenue of Sonnen is $132.91M as on Dec 31, 2021.
Sonnen was founded in 2010 in Wildpoldsried, Germany, as a provider of solar-integrated energy storage solutions in the renewable energy sector. Systems for residential and commercial applications are offered, including eco, hybrid, and pro series that integrate with fuel cells and wind turbines, featuring built-in inverters. Energy consumption is monitored and controlled via a mobile application. Additional offerings include solar water heaters, power backup systems, and e-vehicle charging solutions.
Sonnen offers sonnenBatterie and Smart Energy Solutions.
Sonnen has made 1 acquisition, including Webatt Energy.
Sonnen has 11 investors. Key investors include Shell, eCapital, Envision Group, General Electric, and European Investment Bank.
Sonnen operates through Sonnen Gmbh.
Yes. Sonnen was acquired by Atrato Onsite Energy in October 2022.