Grammer Solar
- Company typePrivate
- Founded1977
- HeadquartersAmberg, Germany
- Headcount11–50
- GTM typeB2B and B2C
- OfferingHardware or Manufacturing
What Grammer Solar does
Grammer Solar GmbH is a German solar energy company headquartered in Amberg, Bavaria, that designs, manufactures, and installs two core product lines: SolarLuft (solar air collectors under the TWINSOLAR and JUMBOSOLAR brands) used for building ventilation, heating, and agricultural drying, and SolarStrom (turnkey photovoltaic systems) ranging from residential rooftops to commercial and ground-mounted installations. The company holds the distinction of being the first Solar Keymark certified solar air collector manufacturer in Europe (2018) and operates a zero-emission factory in Amberg where its products are manufactured. Its technology portfolio includes the TWINSOLAR compact (an autonomous, solar-cell-powered air collector requiring no grid connection), TWINSOLAR Duo (a 106mm-thick facade-mounted variant with optional external PV module), and JUMBOSOLAR (large-area GLK collectors for industrial halls, sports facilities, and drying processes), complemented by add-on offerings in battery storage and EV charging infrastructure.
The company monetizes primarily through one-time equipment sales and installation services for both product lines, supplemented by recurring maintenance/repair contracts and advisory services for BAFA and KfW subsidy programs. It sells directly from its Amberg headquarters and through wholly-owned subsidiaries in Spain (Valencia, 2006), France (Montrottier, 2011), and Chile (Santiago, 2014), and distributes via a network of more than 40 certified partner businesses across 15+ European countries. Customers are horizontally diversified across residential, commercial/industrial, agricultural, municipal, and niche segments such as alpine huts and research stations, with 6,000+ cumulative installations and 100+ MWp of total installed PV capacity reported.
Grammer Solar is a private, family-owned company following a 2000 management buyout from Grammer AG by Siegfried Schröpf and Wolfgang Dotzler. The company is currently undergoing a generational transition, with energy engineer Walther Geiger and electrician master Simon Schwab acquiring shares in late 2025/early 2026 while Schröpf retains majority ownership and his managing director role. Headcount is reported in the 11-50 range, no external institutional funding or private equity backing is indicated, and revenue is not publicly disclosed.
Grammer Solar firmographics
Firmographics- Name
- Grammer Solar
- Legal name
- Grammer Solar GmbH
- Website
- https://grammer-solar.com
- Company type
- Private
- Founded year
- 1977
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Ownership category
- akta.pro rank
Grammer Solar industry classification
Industry- Product category
- Solar Energy Equipment
- NAICS
- Solar Electric Power Generation (221114)
- SIC
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)
- akta.pro primary industry
- Solar Roofing & Roof-Mounted PV Systems (IMADAFAO)
Keywords
Where Grammer Solar is headquartered
LocationHeadquarters
- HQ city
- Amberg
- HQ country
- Germany
- HQ region
- Europe
Offices3 records
Markets served
Grammer Solar business model
Business model- GTM type
- B2B and B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Solar Air Collector Sales: Sale of TWINSOLAR and JUMBOSOLAR solar air collector systems for ventilation, heating and drying applications. Includes package solutions with all necessary components for installation.
- PV System Installation: Turnkey photovoltaic system installation for residential, commercial, agricultural and ground-mounted applications. Includes planning, components, installation and grid connection.
- Solar Services: Maintenance, repair, and service contracts for solar installations. Includes regular inspections, troubleshooting, and component replacement.
- Subsidy/Funding Consultation: Advisory services for government subsidies and funding programs including BAFA and KfW support for solar air and PV systems.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | TWINSOLAR compact packages |
| Unit Pricing | Pay-as-you-go | TWINSOLAR Duo packages |
| Unit Pricing | Multi-year contract | JUMBOSOLAR collector packages |
Go-to-market motion2 records
Distribution channels5 records
Marketing channels5 records
Grammer Solar product offering
Product offeringCore offering
Grammer Solar manufactures and installs proprietary solar air collector systems (TWINSOLAR, TWINSOLAR Duo, JUMBOSOLAR) for building ventilation, heating, and drying applications, and delivers turnkey photovoltaic (PV) systems for residential, commercial, agricultural, and ground-mounted installations. The company offers complete package solutions including planning, components, installation, battery storage, EV charging, and maintenance services, all manufactured at its zero-emission facility in Amberg, Germany.
Product overview
Grammer Solar offers two core product lines: SolarLuft (solar air collectors) and SolarStrom (photovoltaics), both developed and manufactured at their zero-emission facility in Amberg, Germany. The SolarLuft portfolio includes the TWINSOLAR compact (autonomous, self-powered air collector), TWINSOLAR Duo (with external PV module for flexible mounting), and JUMBOSOLAR (large-scale collectors for industrial applications). The SolarStrom line provides turnkey PV installations for residential, commercial, agricultural, and open-space applications. Add-on services include battery storage solutions and EV charging infrastructure. All systems are backed by planning, maintenance, and repair services, with SolarLuft collectors holding Solar Keymark certification as the first certified manufacturer in Europe.
Differentiator
Problem solved
Functional benefit
Brands
- TWINSOLAR: Autonomous air collectors for solar ventilation - simple and operationally safe, from small holiday homes to residential buildings. Features solar cell powered fan, filter, and insulated air collector that heats air by up to 40°C.
- JUMBOSOLAR
Products and services
- SolarLuft (Solar Air Collectors) Solar air collector systems that harness solar energy for ventilation, heating, and tempering of buildings using air as heat transfer medium. Operationally safe, low-maintenance, suitable for residential homes, holiday houses, mountain huts, sports halls, and industrial buildings.
- SolarStrom (Photovoltaic Systems) Turnkey photovoltaic (PV) systems for generating solar electricity, installed on residential, commercial, agricultural buildings, and open-space installations. Includes planning, components, installation and grid connection with over 6,000 installations completed and more than 100 MWp total capacity.
- TWINSOLAR compact Self-contained solar air collector system for autonomous ventilation, heating, and moisture control. Integrated solar cells power the fan, requiring no external electricity connection. Available in collector sizes from 1.3 to 6.0 m², delivering up to 125 m³ warm fresh air per hour.
- TWINSOLAR Duo Facade-mounted solar air collector with external PV module arrangement. Features only 106mm height and 22kg weight, enabling flush wall installation with flexible mounting options for partially shaded situations.
- JUMBOSOLAR Large-scale solar air collector packages using GLK (Große LuftKollektoren) collectors for heating, ventilation, and drying applications. Designed for sports halls, industrial halls, agricultural buildings, and process heat applications with no size limitations on collector area.
- Speicherlösungen (Battery Storage Solutions) Battery storage solutions integrated with PV systems to increase self-consumption rates and provide backup power capability for residential and commercial customers.
- Elektro-Mobilität (EV Charging / Wallbox) Electric vehicle charging solutions including Wallbox installations, often combined with PV systems for sustainable transportation energy for residential and commercial customers.
- SolarDienstleistungen (Solar Services) Comprehensive solar services including planning, maintenance, repair, and subsidy/financing consultation for SolarStrom and SolarLuft systems. Includes advisory on government subsidies like BAFA and KfW programs.
Quantifiable outcome
- SolarLuft systems deployed in over 50 countries
- +3 more outcomes
Companies that use Grammer Solar
Customer profileNamed customers10 records
Segments4 records
Ideal customer profiles3 records
Grammer Solar technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Grammer Solar partnerships and signals
Strategic signalPartnerships
15 partnerships are on record, tiered core and minor.
- GRAMMER Solar Chile SpAcoreRegional headquarters for Chile market, located in Santiago de Chile. Established in 2014.
- TÜKENMEZ ENERJI Ltd.minorExclusive partner for Turkey. Located in Bornova, Izmir. Handles sales and installation of Grammer Solar products in Turkish market.
- Kippel Leo & Söhne AGminorPartner in Switzerland, located in Susten. Provides solar air and PV solutions in the Swiss market.
- SoloSolar GmbHminorPartner in Switzerland, located in Wallisellen. Specializes in solar air collector solutions.
- Solaire 1300minorPartner in Switzerland, located in Gryon. Provides solar solutions in the Swiss market.
- SAS SOLARISminorExclusive partner for France, located in Saint-André-de-Corcy. Managed by Claude Gaget.
- Solar-kW Pitiusa S.L.minorPartner in Spain (Ibiza), located in Santa Eulalia del Rio. Handles solar installations in the Balearic Islands.
- GRAMMER Solar ValenciacoreRegional headquarters for Spain and Portugal markets. Located in Valencia with contact Laura Tarin.
- Bas de BouwerminorPartner in the Netherlands, located in Zoeterwoude.
- BIO-4 Umwelttechnik GmbHminorPartner in Austria, located in Absam. Managed by Christian Becker.
- PETER KAPELARI Berge - Menschen - Wege zum ZielminorPartner in Austria, located in Mieders im Stubaital. Specializes in mountain shelter solar installations.
- ENER GREEN GATE srlminorPartner in Italy, located in Piacenza. Managed by Claudio Minelli.
- Pinelies shopminorPartner in Greece, located in Mykonos. Handles solar solutions in the Greek island market.
- Miravolt, Servicos de Energia, Unip. Lda.minorPartner in Portugal, located in Sabóia.
- PolyvivacminorCo-development partner for specialized vivac ventilation projects in Austrian Alps. Jointly developed integrated solar ventilation concept for mountain shelters.
Scale indicators5 records
Recent moves11 records
Expansion highlights5 records
Grammer Solar competitors and assessment
Company assessmentBroad incumbents
- Vaillant: Major European heating technology provider with solar thermal offerings (heat pumps, boilers, solar collectors). Overlaps with Grammer Solar's solar air and PV-plus-heating propositions at the residential and commercial building level.
- E.ON Solar / E.ON Energie Deutschland: Major German energy utility with a residential and commercial solar PV installation arm. Competes with Grammer Solar in turnkey PV sales and benefits from significantly larger capital, brand, and customer-acquisition resources.
- Viessmann: Large German heating, industrial, and refrigeration systems company with a solar thermal product line. Competes with Grammer Solar in solar-assisted heating but operates as a broad incumbent across many HVAC technologies.
Emerging players
- Zolar: German online solar marketplace connecting homeowners with regional installers for PV and storage. Competes indirectly with Grammer Solar for residential PV customers via a digital-first channel model.
- Enpal: German solar lease and installer offering residential PV, battery storage, heat pumps, and EV chargers. Overlaps with Grammer Solar on residential PV but operates a leasing model rather than direct equipment sales.
- 1Komma5°: Fast-growing German residential solar, heat pump, and EV charging installer. Competes with Grammer Solar for residential PV customers but offers a much broader digitally-enabled integrated energy product.
Direct peers
- Solvis: German manufacturer of solar thermal and hybrid heating systems including solar air collectors. Closely comparable to Grammer Solar in technology (solar thermal collectors), German manufacturing base, and heating-focused customer base.
- Wagner Solar: German solar thermal and PV installer/manufacturer with a focus on solar heating, hot water, and combined PV/thermal systems. Closely comparable product overlap with Grammer Solar's SolarLuft and SolarStrom lines.
- SolarVenti: Danish manufacturer of solar air collectors for ventilation and drying. Direct competitor to Grammer Solar's TWINSOLAR line, serving overlapping residential, agricultural, and remote-building use cases across Europe.
- IBC Solar: German PV system integrator and EPC contractor serving residential, commercial, and utility-scale customers. Closely comparable to Grammer Solar's SolarStrom turnkey PV business and its distribution-channel model.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks7 records
Key highlights7 records
Customer concentration
Grammer Solar social profiles
Digital presenceGrammer Solar financial estimates
Financial estimateRevenue estimate
Valuation estimate
Grammer Solar leadership team
Management profileNumber of profiles
Profiles4 records
Grammer Solar subsidiaries and ownership
Company hierarchySubsidiaries3 records
Grammer Solar funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Grammer Solar M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Grammer Solar
What does Grammer Solar do?
Grammer Solar manufactures and installs proprietary solar air collector systems (TWINSOLAR, TWINSOLAR Duo, JUMBOSOLAR) for building ventilation, heating, and drying applications, and delivers turnkey photovoltaic (PV) systems for residential, commercial, agricultural, and ground-mounted installations. The company offers complete package solutions including planning, components, installation, battery storage, EV charging, and maintenance services, all manufactured at its zero-emission facility in Amberg, Germany.
Is Grammer Solar a public or private company?
Grammer Solar is a private company. It is classified as family owned and is currently operating.
When was Grammer Solar founded?
Grammer Solar was founded in 1977. It employs 11 to 50 people.
Where is Grammer Solar based?
Grammer Solar is headquartered in Amberg, Germany, in the Europe region.
How does Grammer Solar make money?
Four revenue lines are on record. Solar Air Collector Sales are the primary driver. The others are PV System Installation, solar Services and subsidy/Funding Consultation.
Who are Grammer Solar's main competitors?
Broad incumbents on record are Vaillant, E.ON Solar / E.ON Energie Deutschland and Viessmann. Emerging players are Zolar, Enpal and 1Komma5°. Direct peers are Solvis, Wagner Solar, SolarVenti and IBC Solar.
Does Grammer Solar have an API?
No public API is recorded for Grammer Solar.
What industry is Grammer Solar in?
Grammer Solar's product category is Solar Energy Equipment. Its primary akta.pro industry code is IMADAFAO, Solar Roofing & Roof-Mounted PV Systems. Its NAICS code is 221114 and its SIC code is 3585.