# Christoph Ostermann

> Christoph Ostermann is a Series A investor at Sonnen backing Energy Storage and Renewable Energy. See 4 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Sonnen](https://shizune.co/investors/profile/sonnenbatterie)
- Location: Kempten, Germany
- Total investments: 4
- Last investment: Aug 2023
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/christoph-ostermann-bb804976/

Christoph Ostermann is a Co-Founder at Sonnen.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Energy Storage | 2 | 50% |
| Renewable Energy | 2 | 50% |
| Energy | 1 | 25% |
| Clean Energy | 1 | 25% |
| Electric Vehicle | 1 | 25% |

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 2 | 50% |
| Seed | 1 | 25% |
| Series B | 1 | 25% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Germany | 2 | 50% |
| Austria | 1 | 25% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Efficient Energy Technology | Efficient Energy Technology makes renewable energy simple, safe, and dependable for everyone. Efficient Energy Technology develops a small power plant consisting of photovoltaic and storage for complete self-installation. | $7.2M | Series A | Aug 04, 2023 |  |
| ESFORIN | ESFORIN SE is a fully digital energy company, offering modularly integrable energy solutions – for both, power and gas. | $8.1M | Series B | May 24, 2023 |  |
| Numbat | Numbat is a clean-tech company from Kempten (Allgäu). The competence lies in the development and production, as well as the operation of High-Power charging solutions with integrated battery storage system. The goal is to establish Europe's densest High-Power charging infrastructure to support e-mobility and its challenges. The battery storagereduces electricity costs and eases the burden on grids, while the integrated fast charging station allows customers/visitors/employees to fully charge their electric vehicles within 15 minutes. Depending on the location, the Numbats can be provided free of charge in a platform model. With its patented climate protection technology and multi-lifecycle approach, the Numbat is the most sustainable solutions on the market. |  | Seed | Jul 28, 2022 |  |
| ESFORIN | ESFORIN SE is a fully digital energy company, offering modularly integrable energy solutions – for both, power and gas. |  | Series A | Apr 20, 2021 |  |

4 of 4 investments shown.

## Co-investors
- [ERAME Equity](https://shizune.co/investors/profile/erame-equity) — VC Fund, 2 deals together
- [SET Ventures](https://shizune.co/investors/profile/set-ventures) — VC Fund, 2 deals together
- [eCAPITAL ENTREPRENEURIAL PARTNERS](https://shizune.co/investors/profile/ecapital-entrepreneurial-partners-ag) — VC Fund, 1 deal together
- [Junction Growth Investors](https://shizune.co/investors/profile/junction-growth-investors) — VC Fund, 1 deal together
- [SEB Greentech Venture Capital](https://shizune.co/investors/profile/seb-greentech-venture-capital) — VC Fund, 1 deal together
- [Statkraft Ventures](https://shizune.co/investors/profile/statkraft-ventures) — VC Fund, 1 deal together

## About Sonnen

VC Fund · Wildpoldsried, Germany

Sonnen offers solutions which are much more than only storage and includes many additional benefits like active energy management, smart metering and virtual power plant integration. Different system sizes are offered, optimally customized to the requirements of residential homes, agricultural farms and commercial firms. Sonnenbatterie wasintroduced to the German and Austrian markets in January 2011 as one of the first proven and transportable intelligent lithium storage systems.

5 contacts available at Sonnen.

| Name | Title | Profile |
| --- | --- | --- |
| Christoph Ostermann | Co-Founder & CEO | https://shizune.co/investors/profile/christoph-ostermann |
| Jean-Baptiste Cornefert | Managing Director | https://shizune.co/investors/profile/jean-baptiste-cornefert |
| Nathan Dunn | Chief Commercial Officer; CEO APAC/Managing Director sonnen Australia Pty Ltd | https://shizune.co/investors/profile/nathan-dunn |
| Oliver Koch | COO & Managing Director | https://shizune.co/investors/profile/oliver-koch |
| Torsten Stiefenhofer | CINO | https://shizune.co/investors/profile/torsten-stiefenhofer |

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## FAQ

### What does Christoph Ostermann invest in?

Christoph Ostermann invests primarily in Energy Storage, Renewable Energy and Energy startups, most often at Series A and Seed stage. Most of the 4 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Christoph Ostermann last invest?

The most recent investment recorded for Christoph Ostermann closed in Aug 2023. Shizune tracks 4 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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