Sunstall
Sunstall is a US ground-mount solar installation contractor specializing in pile driving, racking, and module installation across 38 states. Headquartered in Novato, California, the company serves solar developers, EPCs, and institutions with 800 MW+ installed and proprietary robotics technology.
- Company typePrivate
- Founded2010
- HeadquartersNovato, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Sunstall does
Sunstall is a US-based solar installation contractor founded in 2010 and headquartered in Novato, California, specializing in ground-mount photovoltaic (PV) construction. Core services include pile driving, racking assembly, module installation, and load testing. The company operates across 38 US states and has completed more than 700 projects representing 800 MW+ of cumulative installed capacity, serving solar developers, EPCs (engineering, procurement, and construction firms), and institutional customers including UC Davis, Colorado State University, Gehrlicher Solar, Wolf Engineering, TTS Construction, Advanced Energy Systems, OMCO Solar, and Coldwell Solar.
The company's technology stack comprises two proprietary offerings: SunRobi, a robotic-assisted installation platform launched in January 2026 that integrates AI-enabled site intelligence and GPS-guided precision, and Sunzaun, a vertical bifacial racking system. Sunstall is a certified installer for five major racking OEMs — NEXTracker, GameChange, Array Technologies, Schletter, and FlexRack — and its crews are experienced across more than 35 racking systems. In February 2026 the company added Cosmic Robotics' Cosmic-1A robotic system to its certified technology portfolio, signaling a robotics-forward installation approach. The business has expanded beyond utility-scale ground-mount into adjacent verticals including agrivoltaics, airports, and canals.
Sunstall operates a B2B, project-based revenue model with custom quotations per project and no disclosed subscription or recurring-revenue component. The company is privately held with no disclosed external funding, maintains a workforce of 11–50 employees, and is led by co-founders Helge Biernath (CEO), Craig Dinsdale (COO), and Stefan Bauer (CTO). It was recognized with the U.S. Installer Award in 2024.
Sunstall firmographics
Firmographics- Name
- Sunstall
- Legal name
- Sunstall Inc.
- Website
- https://sunstall.com
- Company type
- Private
- Founded year
- 2010
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Sunstall is a US ground-mount solar installation contractor specializing in pile driving, racking, and module installation across 38 states. Headquartered in Novato, California, the company serves solar developers, EPCs, and institutions with 800 MW+ installed and proprietary robotics technology.
- Ownership category
- akta.pro rank
Where Sunstall is headquartered
LocationHeadquarters
- HQ city
- Novato
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Sunstall business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Supply Chain, Others
Revenue model
- Solar Installation Services: Sunstall generates revenue by providing professional installation services for ground-mount solar arrays. Services include pile driving, racking assembly, module installation, load testing, and post-installation maintenance/repair. Revenue is project-based with pricing negotiated for each contract based on scope, location, and system specifications.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom project-based pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
Sunstall product offering
Product offeringCore offering
Sunstall provides professional mechanical installation services for utility-scale ground-mount solar arrays, including pile driving, racking assembly, module installation, load testing, and post-installation repair, repower, and warranty services. The company operates across 38 US states and supports 35+ different racking and tracker systems. Beyond installation services, Sunstall offers two proprietary product lines: SunRobi, a robotic-assisted installation platform (with certification as the first US operator of Cosmic Robotics' Cosmic-1A autonomous systems), and Sunzaun, a vertical bifacial racking system for agrivoltaics and space-constrained applications.
Product overview
Sunstall is a solar installation company offering services for ground mount solar systems. Its product portfolio includes SunRobi, a robotic-assisted installation platform that integrates autonomous robotics, GPS-guided precision, and AI-enabled site intelligence for utility-scale solar construction; and Sunzaun, a vertical bifacial solar mounting solution designed for agrivoltaics, canal, and railway applications. The company also provides installation services including pile driving, racking assembly, module installation, load testing, and repair/repower/warranty services, working with various racking manufacturers and tracker systems across commercial and utility-scale projects.
Differentiator
Problem solved
Functional benefit
Brands
- SunRobi: Robotic-assisted solar installation platform integrating robotic equipment, GPS-guided precision, AI-enabled site intelligence and field-proven construction expertise for utility-scale solar construction.
- Sunzaun
Products and services
- SunRobi Robotic-Assisted Installation Platform Technology-agnostic robotic-assisted solar installation platform that integrates robotic equipment, GPS-guided precision, and AI-enabled site intelligence to accelerate, standardize, and de-risk utility-scale solar construction while augmenting human workers. SunRobi is also the first US certified operator of Cosmic Robotics' Cosmic-1A autonomous solar module installation system.
- Sunzaun Vertical Bifacial Racking System Purpose-built vertical bifacial PV racking system for dual-use applications such as canals, railways, and agrivoltaics. The vertical ground-mounted system collects sunlight from both east and west, offers even shading, easy equipment access, and strong crop compatibility, reducing soiling by up to 95% versus tilted panels and delivering 87% of annual energy with superior winter performance.
- Pile Driving Service Specialized pile driving service for ground-mount solar foundations, supporting racking and tracker installations across varied terrains and soil conditions. Targeted at utility-scale solar developers and EPCs needing reliable foundation work for ground-mount arrays.
- Racking Assembly Service Mechanical assembly of racking and mounting structures for ground-mount solar arrays. Sunstall has experience with 35+ different racking and tracker systems including NEXTracker, GameChange, Array Technologies, Schletter, FlexRack, and OMCO Solar products.
- Module Installation Service Nationwide installation of solar modules on ground-mount arrays, delivered as a contracted service for utility-scale solar developers and EPCs across 38 US states.
- Load Testing and Value-Added Services Post-installation load testing and other value-added services that validate structural integrity and quality of ground-mount solar installations before handover, helping reduce long-term O&M costs.
- Repair, Repower and Warranty Services Post-installation inspection, maintenance, repair, repower, and warranty services for existing ground-mount solar arrays, supporting both Sunstall-installed and third-party systems over the asset lifecycle.
Quantifiable outcome
- 800 MW+ installed capacity across 700+ projects
- +4 more outcomes
Companies that use Sunstall
Customer profileNamed customers6 records
Segments2 records
Ideal customer profiles3 records
Sunstall technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability1 record
Feature2 records
Sunstall partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core and minor.
- Cosmic RoboticscoreSunRobi, the robotic-assisted construction division of Sunstall, became the first certified operator of Cosmic Robotics' autonomous solar module installation system (Cosmic-1A). This partnership integrates advanced construction robotics into real-world production environments at utility scale, enabling higher throughput while reducing physical strain on workers. The certification validates that robotic-assisted installation can materially improve speed, consistency, and workforce sustainability, directly addressing skilled labor shortages.
- Coldwell SolarcoreSunstall celebrated completion of its 100th solar project in collaboration with Coldwell Solar and OMCO Solar. This milestone highlights the strength and consistency of a long-standing partnership across multiple solar installation projects.
- OMCO SolarcorePartnership established in 2018-2019 for solar installation projects. Together, Sunstall and OMCO Solar have installed over 30 MW of clean solar energy spanning 25 project sites ranging from dairy farms to food and beverage facilities to retail power entities. The partnership continued to grow, completing their 100th joint project in 2025. OMCO's pre-assembled product components are designed for fast and safe installation, which Sunstall provides.
- NEXTrackercoreCertified partner and installer of NEXTracker products. Sunstall has installed Nextracker systems including single-axis trackers on various projects including the Cooley Quarry project.
- GameChange RackingcoreCertified partner and preferred installer of GameChange racking systems.
- Array TechnologiescoreCertified installer partner for Array Technologies' single-axis solar trackers. Sunstall participated in Array's Certified Installer Program launch.
- Schletter GroupcoreCertified partner and installer of Schletter Group racking and mounting systems.
- Solar Flex Rack (FlexRack)corePreferred installer partner for Solar Flex Rack's ground-mount solar mounting solutions.
- Sandbox SolarminorLocal EPC and recognized leader in agrivoltaics that served as the main contractor for the Colorado State University viticulture-focused agrivoltaics project. Sunstall served as the installation contractor.
- University of California DavisminorSunstall installed all four systems (448 modules totaling 200.44 kW) at UC Davis's expanded agrivoltaics research site. Sunstall donated the original Sunzaun installation in 2023 and installed the expanded system in October 2025.
- SunzauncoreSunzaun is a product line and subsidiary of Sunstall offering purpose-built vertical bifacial solar racking systems. Sunstall serves as the parent company and installer for Sunzaun products, which are ideal for narrow corridors, canal banks, and space-constrained applications.
Scale indicators7 records
Recent moves7 records
Expansion highlights5 records
Sunstall competitors and assessment
Company assessmentDirect peers
- SOLV Energy: SOLV Energy is one of the largest US utility-scale solar EPC contractors, providing engineering, procurement, and construction services for ground-mount and tracker-based projects—directly comparable to Sunstall's core installation services across racking, pile driving, and module installation.
- Swinerton Renewable Energy: Swinerton Renewable Energy is a major US solar EPC focused on utility-scale and commercial ground-mount projects, offering racking installation, pile driving, and module deployment—directly overlapping with Sunstall's service portfolio and customer base of developers and EPCs.
- McCarthy Building Companies: McCarthy's Renewable Energy group provides utility-scale solar EPC and installation services, competing for the same developer and IPP contracts as Sunstall on ground-mount projects across the US.
- Mortenson Construction: Mortenson's Renewable Energy group delivers large-scale wind, solar, and storage EPC, with deep utility-scale ground-mount solar installation capabilities that directly compete with Sunstall for major developer projects.
Broad incumbents
- Primoris Services Corporation: Primoris is a publicly traded infrastructure contractor with a substantial utility-scale solar construction arm; it competes with Sunstall on large ground-mount projects but operates a much broader portfolio spanning power, pipeline, and civil work.
- IEA Constructors (a MasTec company): IEA/MasTec Renewables is a large utility-scale wind and solar EPC operating nationwide, with installation services that overlap with Sunstall's offering as part of a much larger infrastructure construction portfolio.
- Blattner Energy (a Quanta Services company): Blattner, now part of Quanta Services, is a leading US wind and solar EPC contractor providing utility-scale installation services—comparable to Sunstall in solar ground-mount installation but operating within a much larger infrastructure platform.
Emerging players
- Cosmic Robotics: Cosmic Robotics develops the autonomous Cosmic-1A module installation system that Sunstall's SunRobi division is the first certified operator of; adjacent as the technology partner enabling Sunstall's robotics differentiation.
Others
- OMCO Solar: OMCO Solar is a strategic partner of Sunstall and a major US solar racking manufacturer with whom Sunstall has installed 30+ MW across 25 sites and completed its 100th joint project in 2025; comparable as a partner-channel rather than a direct competitor.
- NEXTracker: NEXTracker is the largest US solar tracker manufacturer and a certified-partner customer of Sunstall; comparable as a downstream channel that influences Sunstall's project pipeline rather than as a competing installer.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Sunstall social profiles
Digital presenceSunstall financial estimates
Financial estimateRevenue estimate
Valuation estimate
Sunstall leadership team
Management profileNumber of profiles
Profiles4 records
Sunstall subsidiaries and ownership
Company hierarchySubsidiaries2 records
Sunstall funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Sunstall 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 Sunstall
What does Sunstall do?
Sunstall provides professional mechanical installation services for utility-scale ground-mount solar arrays, including pile driving, racking assembly, module installation, load testing, and post-installation repair, repower, and warranty services. The company operates across 38 US states and supports 35+ different racking and tracker systems. Beyond installation services, Sunstall offers two proprietary product lines: SunRobi, a robotic-assisted installation platform (with certification as the first US operator of Cosmic Robotics' Cosmic-1A autonomous systems), and Sunzaun, a vertical bifacial racking system for agrivoltaics and space-constrained applications.
Is Sunstall a public or private company?
Sunstall is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Sunstall founded?
Sunstall was founded in 2010. It employs 11 to 50 people.
Where is Sunstall based?
Sunstall is headquartered in Novato, United States, in the North America region.
How does Sunstall make money?
One revenue line is on record: solar Installation Services.
Who are Sunstall's main competitors?
Direct peers on record are SOLV Energy, Swinerton Renewable Energy, McCarthy Building Companies and Mortenson Construction. Broad incumbents are Primoris Services Corporation, IEA Constructors (a MasTec company) and Blattner Energy (a Quanta Services company). Cosmic Robotics is listed as an emerging player. Others are OMCO Solar and NEXTracker.
Does Sunstall have an API?
No public API is recorded for Sunstall.