What WATT HOUR does

WATTSTUNDE GmbH is a German off-grid solar energy solutions provider headquartered in Lüneburg, Germany, operating in the DACH region (Germany, Austria, Switzerland). Founded over 15 years ago, the company is positioned as a mid-sized (mittelständisch) privately held GmbH with no external funding, parent company, or subsidiaries.

The company develops and distributes three proprietary product lines under the SOLA, TARA, and NOVA brands. SOLA covers solar modules in rigid (Frame Mono, Frame Black, Frame Daylight) and flexible/foldable (Flex Mono, Flex Daylight, Ease) formats. TARA includes power electronics—Sync inverters and Flow MPPT charge controllers. NOVA covers battery storage: Base² (LiFePO4), Core² (LiFePO4 with heating function), and Lead (AGM). The company also resells EcoFlow's portable and home battery systems (RIVER, DELTA, STREAM, PowerOcean) as an authorized reseller, alongside cables and accessories. It offers OEM/customized solutions for partners.

WATTSTUNDE operates a dual-channel go-to-market: a B2C e-commerce shop (SOLARKONTOR at solarkontor.de) and a dedicated B2B portal (b2bshop.wattstunde.de), supplemented by a physical retail store at its Lüneburg headquarters and a Premium Partner program for resellers/installers. Distribution is also supported through trade show presence (e.g., Abenteuer & Allrad) and warehouse logistics from a second Lüneburg location.

Name

WATT HOUR

Legal name

WATTSTUNDE GmbH

Website

https://wattstunde.de

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

51–100 employees

Short description

WATTSTUNDE GmbH is a German mid-sized off-grid solar energy provider in Lüneburg, offering proprietary solar modules, charge controllers, inverters, and battery storage systems (SOLA, TARA, NOVA brands), plus EcoFlow reselling, to B2C and B2B customers across the DACH region.

Ownership category

akta.pro rank

Headquarters

HQ city

Lüneburg

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Revenue model

1. Solar Module Sales: Sale of proprietary solar photovoltaic modules across three frame types (SOLA Frame MONO, BLACK, DAYLIGHT) and two flexible lines (SOLA Flex MONO, DAYLIGHT), plus portable SOLA Ease foldable solar bags. Modules range from 10Wp to 340Wp. Revenue is one-time per unit, sold through B2C (SOLARKONTOR) and B2B (WATTSTUNDE B2B-Shop) channels.
2. Battery & Energy Storage Systems: Sale of proprietary LiFePO4 batteries (NOVA Base², NOVA Core²) and AGM batteries (NOVA Lead). Batteries are sold as standalone units or as components of full system packages. Revenue is one-time per unit with long replacement cycles.
3. Power Electronics & Accessories: Sale of TARA-series MPPT charge controllers (TARA Flow), sine wave inverters (TARA Sync), cables, mounting hardware, and installation accessories. Complementary product lines that round out system solutions and drive repeat purchase through installation and maintenance.
4. EcoFlow Reseller (Third-Party Products): Authorized EcoFlow reseller selling EcoFlow RIVER and DELTA power stations, STREAM balcony solar systems, and PowerOcean home storage. WATTSTUNDE earns reseller margin on third-party products sold through its SOLARKONTOR and B2B shops, bundling EcoFlow products with its own ecosystem.
5. Customized/OEM Solutions (B2B Project Business): B2B project-based revenue from custom solar module manufacturing (Customized Solutions) for OEM, vehicle manufacturing, maritime, and infrastructure clients. Includes system planning support, component specification, and project-specific product bundles for installers and system integrators.
6. System Planning & Consulting Services: WATTSTUNDE provides project consultation, system sizing (via Solarrechner tool and direct inquiry), and planning support for mobile, island, and custom solar projects. While primarily bundled with product sales, this service supports the project business and B2B channel partner ecosystem.

Pricing tiers

Go-to-market motion3 records

Distribution channels5 records

Marketing channels5 records

Core offering

No substantive information was provided in the input to describe the company's core offerings.

Product overview

WATTSTUNDE offers a comprehensive product ecosystem for autonomous solar energy solutions for mobile and stationary applications. The portfolio consists of three core product lines: SOLA (solar modules in flexible, framed, and foldable formats), TARA (power electronics including MPPT charge controllers and inverters), and NOVA (battery storage systems in LiFePO4 and AGM technologies). The SOLA line covers semiflexible (SOLA Flex Mono/Daylight), framed rigid (SOLA Frame Mono/Black/Daylight), and portable foldable (SOLA Ease) solar modules. The TARA line provides TARA Flow MPPT charge controllers and TARA Sync inverters for complete power management. The NOVA line offers LiFePO4 batteries (NOVA Base 2, NOVA Core 2) and AGM batteries (NOVA Lead) with integrated BMS and Bluetooth connectivity via the NOVA App. As an authorized EcoFlow reseller, WATTSTUNDE also offers EcoFlow power stations, balcony power systems, and home storage solutions. The portfolio is complemented by a full range of cables and professional installation accessories.

Differentiator

Problem solved

Functional benefit

Brands

• SOLA: Solar module product line including flexible (SOLA Flex) and framed (SOLA Frame) modules for mobile and stationary applications
• TARA
• NOVA

Quantifiable outcome

• LiFePO4 batteries achieve up to ~60% weight reduction vs. equivalent AGM batteries, improving vehicle payload efficiency
• +5 more outcomes

Segments6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Five partnerships are on record, tiered core and minor.

• EcoFlowcoreChannel Partner/ Reseller/ DistributorWATTSTUNDE is an Authorized EcoFlow Reseller (EcoFlow Authorized Reseller in Deutschland), offering EcoFlow RIVER and DELTA power stations, STREAM balcony solar systems, and PowerOcean home storage products through both its SOLARKONTOR (B2C) and B2B shops. This partnership extends WATTSTUNDE's addressable market into the home/residential segment and provides a complementary product line to its own battery and solar module offerings.
• SolaraminorChannel Partner/ Reseller/ DistributorSolara is listed as one of the brands WATTSTUNDE has interest in distributing. Solara manufactures flexible solar modules for marine and industrial applications.
• Super BminorChannel Partner/ Reseller/ DistributorSuper B is listed as one of the brands WATTSTUNDE has interest in distributing. Super B manufactures lithium batteries for mobile and industrial applications.
• VotronicminorChannel Partner/ Reseller/ DistributorVotronic is listed as one of the brands WATTSTUNDE has interest in distributing. Votronic manufactures battery chargers, inverters, and solar charge controllers for mobile applications.
• mellow GmbHminorOthersmellow GmbH (Brunnenstraße 16, D-35041 Marburg) is WATTSTUNDE's design and development agency partner responsible for website and digital experience design. www.mellow.studio

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Emerging players

• Super B: Dutch manufacturer of lithium batteries for mobile and industrial applications, including campervans and marine. Direct overlap with WATTSTUNDE's NOVA LiFePO4 battery lines.

Broad incumbents

• Bluetti: Global portable power station and home storage brand with growing presence in Europe. Competes with WATTSTUNDE in the broader LiFePO4-based off-grid and residential energy storage market.
• Renogy: US-headquartered off-grid solar and battery products maker with strong European e-commerce presence. Overlaps with WATTSTUNDE across solar modules, MPPT controllers, and LiFePO4 batteries.
• EcoFlow: Global portable power station and home storage maker (RIVER, DELTA, STREAM, PowerOcean). WATTSTUNDE is an authorized EcoFlow reseller in Germany, and the two compete indirectly on LiFePO4 batteries and complete off-grid systems.
• Jackery: Global portable power station brand with strong consumer recognition in Europe. Competes with WATTSTUNDE's EcoFlow-resold portable power offerings and broader off-grid energy proposition.

Direct peers

• Votronic: German manufacturer of battery chargers, inverters, and solar charge controllers for caravaning and mobile applications. Direct overlap with WATTSTUNDE's TARA Sync and TARA Flow products in the German mobile off-grid market.
• Solara: German manufacturer of flexible and rigid solar modules for marine, industrial, and mobile use. Direct overlap with WATTSTUNDE's SOLA Frame and SOLA Flex module lines in the German off-grid channel.
• Offgridtec: German specialist retailer and manufacturer of off-grid solar systems, modules, and batteries with a strong B2C and B2B online presence. Direct competitor to WATTSTUNDE in the German off-grid solar market.
• Victron Energy: Dutch manufacturer of inverters, MPPT charge controllers, and battery systems widely used in off-grid, marine, and mobile applications. Direct overlap with WATTSTUNDE's TARA power electronics and NOVA battery systems in the same customer segments.
• Phaesun: German off-grid solar specialist and distributor with deep roots in solar island systems across Europe. Compares closely with WATTSTUNDE's off-grid solar island and B2B distribution model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@wattstundegmbh
• Facebookfacebook.com/WATTSTUNDE
• LinkedInlinkedin.com/company/wattstunde-gmbh

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

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 WATT HOUR