What Wattsun does

Wattsun (legal entity: WATTSUN pop-up power B.V.) is a Dutch designer and supplier of portable lithium-ion battery systems that replace diesel generators for professional off-grid and temporary-power applications. Founded in 2016 in Arnhem, the company sells two principal hardware platforms: the modular Wattsun Stack (a Dock base unit with stackable Pack expansion modules, scaling from 1.8 kWh up to 11 kWh) and the high-capacity wheeled Wattsun Ventus 6000 (6 kW continuous, 15 kWh). The company's core technical differentiator is an intelligent stacking architecture that automatically discharges modules top-to-bottom and supports hot-swapping of depleted packs without interrupting supply, complemented by built-in UPS, pass-through charging, and dual-MPPT solar inputs. A Solarkit and Foldable Solar line extends the system into fixed and portable PV generation, and a remanufactured product tier offers refurbished modules at lower price points.

The company monetizes primarily through direct quote-based hardware sales and through a Western European dealer and rental network; Boels is a flagship rental partner with Wattsun products at all Boels locations. End markets are vertical-led: construction & infrastructure, events & culture, film & broadcasting, and emergency services & safety, with newer application work in healthcare (Wattsun S1) and rail (ProRail). Pricing is not publicly listed; recurring service revenue (€75/hour workshop rate at the Arnhem service center) and remanufactured product sales supplement new-unit hardware revenue. Distribution is regional, anchored in the Netherlands/Benelux with growing presence in France, Germany, Ireland, Iceland, Czech Republic, Poland, and Switzerland.

Wattsun's customer base includes marquee enterprise references such as Coldplay (world tour), Boels (rental), ProRail (rail incident response), Husqvarna (service vehicles), and major Dutch contractors including VolkerWessels, Heijmans, Dura Vermeer, NTP, Nijhuis Bouw, and Brouwer Group. The company is privately held, founder-led (Koen Olieslagers as Founder & Designer; Bart Hendriks as Co-owner), and has raised modest external capital — approximately $293,601 from EIT InnoEnergy (October 2020) and a €50,000 Rabo Transitieboost grant from Rabobank (May 2026) — with no disclosed institutional equity beyond these. Recognition includes the iF Design Award 2025 for the Stack 3000.

Name

Wattsun

Legal name

WATTSUN pop-up power B.V.

Website

https://wattsun.net

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

11–50 employees

Short description

Wattsun (Arnhem, Netherlands) designs and sells portable, modular lithium-ion battery systems (Stack and Ventus) that replace diesel generators for construction, events, film, and emergency-services professionals across Western Europe, distributed via direct sales and dealer/rental partners including Boels.

Ownership category

akta.pro rank

Product category

Portable Battery Systems

NAICS

Battery Manufacturing (33591), Battery Manufacturing (335910)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB)

akta.pro secondary industries

Batteries & Battery Packs (Rechargeable/Primary, Device-Specific Packs) (CRACATAG), UPS Batteries & Energy Storage Modules (HDACAJAE)

Keywords

• Portable battery systems
• Mobile energy storage
• Off-grid power solutions
• Lithium-ion power systems
• Emission-free generators

Headquarters

HQ city

Arnhem

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Sales: Sale of portable battery systems including Dock, Pack, Ventus, Solar kits, and accessories. Products are sold directly and through dealer network.
2. Rental Revenue: Products available for rent through partner network including Boels and other rental partners across Western Europe.
3. Remanufactured Products: Refurbished battery systems offered at reduced prices, providing accessible entry point while maintaining circular economy model.
4. Service and Repair: Repair services offered at service center in Arnhem with standard workshop rate of €75/hour plus parts.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

Wattsun designs, manufactures, and sells portable, modular lithium-ion battery systems that provide emission-free, silent mobile power for professional users. Its portfolio is anchored by the modular Stack (a Dock base unit paired with expandable Pack modules, configurable from 1.8 kWh to 11 kWh) and the high-capacity wheeled Ventus 6000 (15 kWh, 6000W continuous), complemented by solar panels (Solarkit, Foldable Solar), the compact S1, remanufactured/refurbished units, and accessories such as chargers, locks, and transport boxes.

Product overview

Wattsun offers a modular mobile power ecosystem centered on two main product lines: the Wattsun Stack (portable, stackable battery system) and the Wattsun Ventus (high-capacity mobile power station). The Stack consists of a Dock base unit (available in 2000W and 3000W generations) paired with expandable Pack battery modules that stack on top for additional capacity, configurable from 1.8kWh up to 11kWh. The Ventus 6000 delivers 6000W continuous power with 15kWh capacity for demanding applications. Solar solutions include the Solarkit (fixed panels for site huts/containers) and Foldable Solar (portable panels for remote locations). A specialized S1 unit serves healthcare applications. The accessory lineup includes chargers (360W and 600W), a security lock, charging cable, and transport box. Remanufactured versions of the Dock 2000 and Pack 1.6 offer certified refurbished options at reduced prices.

Differentiator

Problem solved

Functional benefit

Brands

• Wattsun® Stack: Portable and stackable battery system for professionals, consisting of the Dock base unit and modular Pack expansion modules.
• Wattsun® Ventus
• Wattsun® Solar
• Wattsun® Remanufactured
• Wattsun® S1
• Wattsun® Dock
• Wattsun® Pack
• Wattsun® Accessories
• Wattsun Configurator

Products and services

• Wattsun Dock 3000 The base unit of the Wattsun Stack, delivering 3000W continuous power, 1800Wh capacity, a built-in fast charger, UPS functionality, and MPPT solar charging capability. Targeted at professional users needing a portable, emission-free 230V power source on site.
• Wattsun Pack 3000 Expansion battery module for the Dock with 2300Wh capacity. Up to four Packs can be stacked on a Dock for up to 11 kWh total capacity. Features hot-swap capability and a one-handed lifting handle.
• Wattsun Stack The complete modular, stackable battery system combining the Dock base unit with one or more Pack expansion modules. Configurable from 1.8 kWh to 11 kWh, designed for professionals needing scalable mobile power.
• Wattsun Ventus 6000 Wheeled high-capacity mobile battery system delivering 6000W continuous power and 15 kWh capacity. IP65-rated, with integrated UPS and dual MPPT chargers (6500W total) for rapid solar charging. Targeted at heavy-duty professional applications with extended power needs.
• Wattsun Solarkit Fixed solar panel kit for generating, storing, and using energy in site huts, company vans, or containers. Modular from 800W to 1600W nominal output, with IP68-rated panels.
• Wattsun Foldable Solar Foldable solar panel set with three 200W panels delivering 600W total. Portable with a custom carry bag, IP65-rated, monocrystalline cells; suited to remote or temporary deployments.
• Wattsun S1 Ultra-compact battery system with all connections on the front for easy installation in confined mobile applications such as hospital coffee carts. Designed in-house by Wattsun for the Rode Kruis Ziekenhuis project.
• Remanufactured Wattsun Dock 2000 Refurbished original-generation portable battery system with 2000W power, 1400Wh capacity, and 230V outlet. Inspected, restored to like-new condition, and offered with the same warranty and service conditions as new products at a reduced price.
• Remanufactured Wattsun Pack 1.6 Refurbished expansion battery module with 1600Wh capacity, using Panasonic lithium-ion cells, >600 cycles, and compatible with all Wattsun Dock generations. Offered with the same warranty as new products at a reduced price.
• Wattsun Charger 360 360W charger for pre-Dock 3000 Dock and Pack modules. Charges Dock in approximately 4.5 hours and Pack in about 5 hours.
• Wattsun Charger 600 600W fast charger for pre-Dock 3000 Dock and Pack modules. Charges in 2 to 3 hours.
• Wattsun Lock Steady cable lock with 6mm diameter and 300cm length, featuring an adjustable combination code (1,000 possible combinations) for securing Wattsun Stack and Ventus units.
• Wattsun Charging Cable 2-meter charging cable for Wattsun Dock 3000 with Neutrik powerCON connector for safe, reliable grid charging at 820W.
• Wattsun Transportbox Transport crate based on 60x40cm Eurobox dimensions for protecting Wattsun modules during transport. Made of PP material, black color.

Quantifiable outcome

• 41% more battery capacity compared to previous generation in same form factor
• +5 more outcomes

Named customers12 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature7 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• BoelscoreChannel Partner/ Reseller/ DistributorMajor rental partner offering Wattsun Stack and sustainable self-sufficient site huts with Solarkit at all Boels locations in Western Europe. Batteries rented through Boels were used at Belgium's largest carnival parade with 150+ modules deployed.
• Lansing UnitraminorChannel Partner/ Reseller/ DistributorPartner offering Wattsun products, including mobile power solutions for service vehicles and mobile laboratories.
• Brouwer GroupminorChannel Partner/ Reseller/ DistributorPartner providing Wattsun-powered sustainable site hut solutions to their customers in the construction sector.
• Hacon SolarminorChannel Partner/ Reseller/ DistributorPartner offering solar container solutions incorporating Wattsun battery systems.
• Temp-RiteminorStrategic or Co-development PartnerPartner in developing the self-sufficient coffee cart solution for Rode Kruis Ziekenhuis.
• AKBminorStrategic or Co-development PartnerPartner providing buffet carts for Rode Kruis Ziekenhuis project with Wattsun battery integration.
• AnimominorStrategic or Co-development PartnerPartner providing high-quality bean coffee machines integrated with Wattsun S1 battery system for hospital coffee cart.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Aggreko: Aggreko is the world's largest temporary mobile power provider, historically dominant in diesel generator rentals for events, construction, and industry. It is the incumbent Wattsun is displacing in the same end markets and is actively piloting battery-based mobile power.
• HIMOINSA: HIMOINSA designs and manufactures mobile gensets, battery energy storage systems, and hybrid power solutions for rental, events, and industrial customers. It is a broad incumbent addressing the same emission-free temporary power use cases as Wattsun.
• Atlas Copco: Atlas Copco's Power Technique division supplies mobile generators, light towers, and energy storage systems for construction, events, and industrial sites. It is a broad incumbent in the same professional portable-power category Wattsun serves.
• Caterpillar (CAT): Caterpillar, through CAT Rental Power, is a global incumbent in mobile diesel and natural gas generators for construction, events, and utilities, and is launching hybrid/electric mobile power solutions. It competes with Wattsun at the high-capacity end of professional portable power.

Direct peers

• Bluetti: Bluetti designs and sells portable and home backup lithium battery systems, including expandable, stackable power stations with solar charging. Its product architecture and professional/consumer positioning overlap directly with Wattsun's modular Stack and Ventus lines.
• EcoFlow: EcoFlow is one of the largest portable lithium-ion power station brands, offering modular battery systems with solar integration for both consumer and professional/prosumer users. It directly competes with Wattsun's Stack, Ventus, and Solarkit on portable, emission-free power for worksites and off-grid applications.
• Goal Zero: Goal Zero builds portable solar generators and lithium power stations aimed at outdoor, emergency, and professional field use. Its Yeti product line and solar briefcase panels are direct functional equivalents to Wattsun's Stack and Foldable Solar.
• Jackery: Jackery is a major portable power station and solar generator brand focused on outdoor, prosumer, and light-professional use cases. While more consumer-leaning than Wattsun, it competes in the same portable lithium-ion category and at the same price points.

Emerging players

• Anker Innovations (Anker Solix): Anker's Solix sub-brand offers portable and home battery systems with solar charging. It is a credible emerging competitor in the portable lithium-ion power category and overlaps with Wattsun's Stack and Solarkit product positioning.
• Generark: Generark markets portable home backup and outdoor power stations with solar integration, targeting the same lithium-ion portable-power category as Wattsun with comparable capacity and feature sets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/wattsun
• Xx.com/wattsun_net

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds1 record

Investors1 record

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 Wattsun