Resun

What Resun does

Resun GmbH is a privately held German solar technology company founded in 2013 and headquartered in Malsch, Germany. The company delivers end-to-end photovoltaic solutions to private homeowners, commercial businesses, and municipalities within the Malsch region and surrounding catchment. Its service stack spans free initial consultation, on-site assessment, customized PV system design, equipment procurement, professional installation, grid connection administration, and post-installation maintenance. The core technology offering centers on crystalline PV modules, Sungrow string inverters ranging from 2 kW to 352 kW, and compatible battery storage systems, supplemented by solar carports (Krinner), solar street lighting (Photinus), hybrid-capable submersible pumps up to 400m depth, and Wallbox EV charging. Specialized services include drone-based thermography inspections for performance loss detection and certified TÜV expert assessments authored by Managing Director Michael Ganz, a credentialed Sachverständiger authorized to issue inspection reports for PV dispute cases.

Name

Resun

Legal name

Resun GmbH

Website

https://resun.biz

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

Resun GmbH is a regional German solar PV installer and equipment supplier serving private, commercial, and municipal customers in the Malsch area with rooftop systems, storage, EV charging, and inspection services.

Ownership category

akta.pro rank

Product category

Photovoltaic Installation Services

NAICS

Electric Lighting Equipment Manufacturing (33513)

SIC

Misc Industrial & Commercial Machinery & Equipment (3590)

akta.pro primary industry

Energy & Renewables Specialty Contracting (Solar PV, Storage, EV Charging) (IMAFALAJ)

Keywords

• Photovoltaic installation
• Solar system integration
• PV components supply
• Solar maintenance services
• Renewable energy consulting

Headquarters

HQ city

Malsch

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. PV System Sales and Installation: Complete photovoltaic system delivery, installation, and commissioning for residential, commercial, and municipal customers. Revenue generated from equipment supply and installation labor.
2. Component Sales: Sales of PV modules, inverters (Sungrow), battery storage systems, solar lights, and solar pumps as standalone components or bundled with installation services.
3. PV Repair and Maintenance Services: Repair services for existing PV installations and ongoing maintenance support.
4. TÜV Inspection Services: Certified expert assessments and TÜV inspections for existing PV systems, particularly for dispute cases regarding proper installation.
5. Consulting Services: Free initial consultation with paid project planning and custom quotation for PV solutions. Services billed by effort for specialized consulting.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels3 records

Core offering

Resun GmbH is a regional German solar technology provider based in Malsch that delivers, installs, and commissions complete photovoltaic (PV) systems for residential, commercial, and municipal customers. The company supplies PV modules, string inverters (Sungrow), and battery storage systems, complemented by add-on products such as solar carports, solar lights, solar pumps, and EV wallboxes, along with repair, maintenance, drone-based thermography inspections, and certified TÜV expert assessments.

Product overview

Resun GmbH is a solar technology company offering a comprehensive portfolio of photovoltaic products and services. The core offering consists of complete PV system installation (PV-Anlagen) including delivery, mounting, and commissioning, complemented by specialized components (PV modules, Sungrow inverters, and battery storage systems) and add-on products (Solar-Carports, Wallbox, Solarleuchten, and Solarpumpen). The company also provides value-added services including drone-based PV inspections using thermography, TÜV expert assessments, repair services, and free initial consultations. The product ecosystem ranges from residential solutions (string inverters 2-352 kW) to industrial applications, with the company serving private customers, commercial businesses, and municipalities.

Differentiator

Problem solved

Functional benefit

Products and services

• PV-Anlagen (Photovoltaic Systems) Complete PV system installation service including delivery, professional mounting, and commissioning for residential, commercial, and municipal customers. Includes handling of all paperwork with grid operators.
• Solar Carports Carport systems from Krinner that combine vehicle shelter with integrated solar panels for renewable energy generation, offered as part of Resun's product portfolio.
• PV Inspections with Thermography Drone Drone-based PV inspection using thermography technology to quickly identify performance losses and damage on modules for maximum yield optimization.
• PV Modules New and used PV modules from leading manufacturers in crystalline technology, tested and immediately available, and professionally installed.
• Sungrow String Inverters String inverters from Sungrow that convert DC power generated by PV modules to AC power for grid feed-in. Available in power ranges from 2 kW to 352 kW for residential and industrial applications.
• Battery Storage Systems Battery storage systems compatible with Sungrow inverters, suitable for various application scenarios, PV modules, and grid connections.
• Solar Lights (Photinus) Solar-powered street and area lights from Photinus with motion sensors and individual control, ideal for public pathways and squares without requiring underground cable installation.
• Solar Pumps High-performance submersible pumps capable of reaching depths up to 400 meters. Hybrid-capable with solar, grid power, or diesel. Flow rate up to 100,000 liters per hour.
• Wallbox (EV Charging) EV charging station installation services, customized to customer needs and integrated with PV systems.
• PV Repair Service Repair service for existing PV installations to maintain system performance.
• TÜV Expert Assessment TÜV inspection and expert assessment services for existing PV systems, provided by certified expert Mr. Ganz for dispute cases regarding proper installation.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature3 records

Partnerships

One partnership is on record.

• IONOS SEminorOthersExternal hosting provider for the company website. Website hosting services from IONOS SE, Elgendorfer Str. 57, 56410 Montabaur.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Viessmann: Large German HVAC and renewable heating supplier expanding into PV, battery storage and heat-pump integrated solutions. Comparable as a broader incumbent targeting the same residential decarbonization stack (heat + PV + storage) that Resun sells into.
• Solarwatt: Established German manufacturer of glass-glass PV modules and provider of PV + storage + EV solutions through its own installer network. Comparable as a broader incumbent operating in the same product categories and customer use cases as Resun.

Direct peers

• Enpal: Germany's leading solar leasing company installing rooftop PV, batteries and EV chargers for homeowners with a digital sales funnel. Comparable because it sells the same PV + storage + EV stack to the same residential segment that Resun targets.
• IBC Solar: German photovoltaic specialist active since 1982 in PV distribution, project development and turnkey installations for residential, commercial and utility customers. Comparable because it sells the same modules/inverters and executes the same type of PV installations across multiple customer segments.
• Zolar: Online platform that connects German homeowners with regional solar installers and supplies PV system quotes. Comparable as it operates in the same German residential PV installation market and aggregates the same installer network that Resun competes against.
• MEMO-SUN: Regional German solar installer delivering turnkey PV systems, battery storage and EV charging to homeowners and businesses. Comparable as a similarly sized regional full-service PV installer competing for the same customer segments.
• Enerix: German franchise network of regional solar installers offering turnkey PV and storage for residential and commercial customers. Highly comparable regional-install business model to Resun's direct regional delivery motion.
• 1Komma5°: German residential and commercial solar installer offering full-service PV, storage, heat pumps and EV charging with a sales-led, consultation-driven model. Closest scaled analog to Resun's regional full-service PV proposition, just at national scale.

Others

• SMA Solar Technology: Germany's leading inverter manufacturer and a direct competitor/alternative to the Sungrow inverters Resun currently resells. Comparable as a critical ecosystem participant whose product decisions directly shape Resun's bill of materials and service offerings.
• Krinner Solar Carports: German manufacturer of solar carport and ground-mount systems currently supplied to Resun as a partner. Comparable because its products are part of Resun's commercial offering and a potential vertical-integration or white-label alternative for Resun's carport line.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/resun-gmbh

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Resun