Fireproof insulated outdoor enclosure for energy storage. PassivX.
Reclaim space at home and protect your family. A2 fire-resistant enclosures for LiFePO4 and Li-ion batteries.
Fireproof thermally insulated outdoor enclosure PassivX — patented ESS enclosure system designed for outdoor installations. Panel construction with mineral insulation provides fire protection and thermal stability for LiFePO₄ and Li-ion battery packs. Perfect solution for subsidy programs – safe outdoor battery placement.
Why PassivX?
A1 Fire Resistance
Non-combustible materials protect family and property. Certified construction resistant to thermal runaway.
Stable Temperature
Mineral insulation extends battery life. Won't freeze in winter, won't overheat in summer.
Space Saving
Move storage outdoors. Reclaim valuable square meters inside your home or garage.
What is PassivX?
PassivX is a fireproof thermally insulated outdoor enclosure system for electrical energy storage (ESS). Panel construction using cement-fiber boards and mineral insulation provides fire protection, thermal stabilization, and weather resistance. Compatible with LiFePO₄ and Li-ion technologies.
PassivX Fireproof Insulated Enclosures
Modular systems from 15 kWh to MW scale
PassivX Small Unit
Compact fireproof insulated outdoor enclosure
Dimensions
120 × 70 × 120 cm
Capacity
Up to 15 kWh
- •Panel construction: cement-fiber board + mineral insulation
- •Passive thermal regulation without active systems
- •Fire resistance class: A1/A2
- •Ground mounting: plug-and-play installation
- •Compatibility: LiFePO₄, Li-ion
PassivX Large Unit
High-capacity fireproof insulated industrial enclosure
Dimensions
120 × 70 × 220 cm
Capacity
Up to 60 kWh
- •Scalable modular architecture
- •Reinforced steel construction
- •Active ventilation + temperature monitoring
- •Industrial certification: EN 62619, IEC 62933
- •Expansion: cascading unit configuration
PassivX Technology
The PassivX platform was designed as a modular and durable construction intended for long-term operation in outdoor installations. The enclosure uses passive temperature regulation and materials with low thermal conductivity, which supports the stability of energy storage operation.
Key construction features:
- •Layered partition: two cement-fiber boards approximately 10 mm thick each and a layer of mineral wool approximately 80 mm provide a rigid structure and limited heat exchange with the environment.
- •Non-combustible materials: the enclosure is built from components with declared non-combustibility of at least A2 (e.g., cement-fiber boards, mineral wool), which minimizes the share of combustible elements.
- •Thermal insulation: mineral wool λ ≈ 0.035 W/mK allows achieving an approximate thermal transmittance U ≈ 0.4 W/m²K for the wall (estimated value, depending on manufacturer and installation).
- •Environmental resistance: materials designed for outdoor operation maintain stable mechanical and thermal properties for many years of use.
Winter temperature behavior
The layered partition significantly limits heat loss, which at a temperature difference of around 20-25 K (e.g., interior +5°C, environment -15 to -20°C) translates to a heating power requirement of several dozen to around one hundred watts for enclosures of similar dimensions to standard PassivX models.
In practice, this means that maintaining positive temperature is possible using small low-voltage heat sources, powered e.g., from a single PV panel and/or a small wind turbine or the storage itself. However, the exact power depends on the specific enclosure model, battery size, and installation conditions.
Summer temperature behavior (Central Europe)
In summer conditions typical for Poland, Czech Republic, Slovakia, and Germany, where maximum temperatures usually range between 25-32°C, the layered construction and mineral insulation limit rapid heating of the enclosure interior. As a result, the internal temperature rises more slowly than the outside air temperature, and the enclosure exhibits natural thermal inertia.
With proper placement and typical current loads of many installations, energy storage systems with capacities up to approximately 60 kWh can operate without the need for active cooling, although this depends on:
- •enclosure location and sun exposure,
- •storage operation intensity,
- •thermal characteristics of specific batteries,
- •use of passive or semi-passive ventilation.
PassivX Technology Legal Protection
Note: PassivX technology is legally protected.
All key construction elements, including modular enclosures, temperature regulation systems, and layered solutions, are covered by patent applications and utility model:
UPRP applications:
– External modular enclosure for energy storage — P.453636
– Autonomous enclosure with temperature regulation system — P.453656
– Non-combustible enclosure with layered insulation construction — W.133096
Any copying, imitation, or reproduction of these solutions — even partial — will be treated as a violation of the law and may result in full liability for damages.
Produce originally. Do not copy PassivX technology.
PassivX Safety & Certification
PassivX enclosures were designed using non-combustible materials, mineral insulation, and construction with high thermal stability, which increases the safety level of energy storage operation in outdoor conditions.
Material selection and design assumptions were prepared based on the requirements of European standards for batteries, ESS systems, and stationary installations, including:
Design reference standards:
- EN 62619 – Safety requirements for industrial lithium batteries
- EN 50272-3 – Safety principles for battery installations
- IEC 62933 – Energy storage systems – safety requirements
- EU 2023/1542 – Ecodesign and battery safety
Design features affecting safety:
- Non-combustible cement-fiber boards combined with mineral insulation
- Weather resistance and dimensional stability
- Passive temperature stabilization (slower heating in summer, slower cooling in winter)
- Optional PASSIVX-SAFE degassing system with flame arrestor element
- Possibility of installation at greater distance from buildings and combustible elements
Benefits for the user:
- Support for overall ESS installation safety
- Reduction of thermal risk in outdoor applications
- Protection of LiFePO₄ and Li-ion batteries from temperature fluctuations
- Construction prepared for year-round operation in Central Europe
Note: The standards listed above serve as design reference. Full installation compliance depends on the batteries used, BMS and system configuration and may require independent technical assessment.
Support for Distributors & Installers
Professional technical support
PassivX provides full support for trade partners, designers and energy storage system installers. We help at every stage — from model selection, through installation, to system commissioning.
Technical documentation
Partners receive access to:
- chamber installation and foundation instructions
- ventilation, spacing and configuration guidelines
- material technical data sheets
- integration recommendations for PV and ESS systems
Training and onboarding
We offer online and in-person training:
- PassivX chamber installation
- ESS safety (Li-ion)
- best practices for hybrid and off-grid systems
- case studies from real installations
Project support
We help with:
- selecting the appropriate model (5–60 kWh)
- location and ground analysis
- preparing layouts and models for PV projects
- technical consultations with clients and experts
Assistance with first installations
For new partners we provide:
- remote support during first installation
- execution quality control
- assistance with inverter and BMS integration
Priority partner support
Partners receive:
- fast communication with technical department
- access to new products before launch
- dedicated consultation line
- marketing materials package (graphics, 3D, visualizations)
Logistics and availability
We ensure:
- fast delivery times
- regional warehousing
- wholesale and individual shipments
- dropshipping options to distributor customers
Industrial applications
PassivX designed for stationary ESS installations in development, industrial and infrastructure sectors. Solutions for PV farms, microgrids, data centers and critical backup power.
Frequent Questions
Frequently Asked Questions
Technical Questions
Subsidies – "My Wind Power Plant" Program
Contact
Need specifications or a quote? Contact the PassivX team.
Kontakt
Telefon: +48 607 747 694
E-mail: info@passivx.pl
Adres:
ELITSOL Tomasz Mazurek
ul. Zamkowa 38
43-445 Dzięgielów