Semi-solid state BESS engineered for European compliance β proven on Hungarian solar farms and C&I sites.
From 261 kWh cabinets to 5 MWh containers β fire-safe, sub-499 kW DSO-ready, with MVM / E-on / Opus-approved PCS.
Semi-solid BESS deployed across solar farms and industrial sites in Hungary, Romania, Germany and France.
MVM, E-on and Opus-approved 125 kW PCS, with proven sub-499 kW engineering for fast Hungarian DSO approval.
Independent ROI analyses on Hungarian sites: 4.9-year payback Β· 22.6% IRR Β· 41% ROI scenarios β modeled with actual HUPX prices.
Same parent technology behind the NIO 150 kWh EV battery and the world's first 200 MW utility-scale semi-solid BESS (Longquan, China).
Welion Battery Europe is the official Central and Eastern European hub of Beijing WeLion New Energy Technology β a solid-state battery pioneer with 670+ patents, 8 GWh annual production capacity, and the same parent technology supplying NIO's ultra-long-range EV programme.
From our Budapest office, we deliver regional inventory, MVM/E-on/Opus-approved PCS systems, EMS integration with local platforms (Ewiser, Alteneva), and full after-sales coverage across Hungary, Romania, Germany, Poland, Slovakia and the wider CEE region β with native-language project teams that speak DSO.
To be a global pioneer in the solid battery industry
Green energy for all - sustainable energy storage solutions for future generations
Original Innovation, Deep Thinking, Embrace All Possibilities, Extreme Execution
Conventional lithium-ion fails under stress. Semi-solid state batteries don't β and the difference shows in safety, density, lifetime and operating range.
The semi-solid electrolyte eliminates the liquid that drives thermal runaway in standard Li-ion. No fire, no explosion under penetration, short-circuit or overcharge β verified across all stress tests.
vs. liquid LFP / NCMAlmost double the energy density of conventional LFP (~180 Wh/kg). More energy in the same footprint, lighter shipments, smaller containers β significant CapEx and logistics savings at scale.
vs. ~180 Wh/kg LFPStandard liquid LFP can quote 8000 cycles on paper, but ages faster under real-world stress. In long-term cycling simulation, Welion semi-solid cells retain ~75% capacity over a decade of high-frequency operation, outperforming leading liquid LFP cells in measured degradation rate.
vs liquid LFP under real-world stressOperates across the full European temperature range with no performance loss. Less HVAC load, lower auxiliary consumption, smaller cooling capex β particularly relevant in hot Hungarian and Romanian summers.
vs. Li-ion needing active cooling above 25Β°CWelion semi-solid state BESS is delivered DDP to Hungary at price levels comparable to β and in some configurations slightly below β conventional liquid LFP systems. Multi-site orders qualify for additional volume discounts. You're not paying a premium for the safer, longer-lasting chemistry.
European and Chinese reference projects β proven results from real deployments.
Independent ROI analyses with real HUPX prices
5 MW peak Β· 6.3 MWh BESS + 3.75 MWp PV
~780k EUR/year savings Β· 4.9-year payback Β· 22.6% IRR (15 yr)
100 kW MV grid Β· 261 kWh BESS + 50 kWp PV
41.3% ROI Β· ~5,800 EUR/year Β· 9.6-year payback (BESS + export)
522 kWh BESS Β· 50 kWp PV Β· only 150 kW grid connection
Delivers 400 kW dynamic EV charging β boosting capacity beyond grid limit; Tesla Model Y supercharge capable for ~52 min at full load
Hungary Β· Romania Β· Germany Β· France
Welion Group β large-scale & technology firsts
From 261 kWh commercial cabinets to 5 MWh utility containers β fire-safe, sub-499 kW DSO-ready.
Industrial and commercial energy storage systems with semi-solid state battery technology
High energy density and high power batteries for drones and UAVs
LFP and NCM semi-solid state battery cells for energy storage and vehicles
Learn MoreHigh energy density semi-solid state battery packs for various applications
Learn MoreSemi-solid state technology powered industrial energy storage for the CEE region
Semi-Solid Energy Storage Cabinet
High Capacity Semi-Solid Cabinet
Containerized Energy Storage System
From site assessment to long-term operation β delivered locally.
We model your site against real HUPX prices, DSO constraints and your actual load profile β so you see payback, IRR and NPV before you commit. Our Hungarian C&I sites typically pay back in 4.9β9.6 years.
Sub-499 kW Hungarian designs that pass DSO approval in months, not 6β12+ months. MVM/E-on/Opus-approved 125 kW PCS, integrated with Ewiser and Alteneva EMS. Turnkey installation by certified local crews.
Remote diagnostics, preventive maintenance and rapid on-site response across CEE. We aim for sub-48h fault response in Hungary β so your peak shave revenue keeps flowing while standard suppliers are still routing tickets.
5-year standard warranty (or 6,000 cycles, whichever comes first), with a 5-year extension option keeping performance coverage through year 10. Spare parts stocked in EU warehouses β claims processed within 48 hours by your dedicated account manager.
Regional inventory in EU warehouses, customs and VAT handling, drop-shipping for EPC partners. Manufacturing lead time is 30 days; combined with sea freight, plan ~3 months total β no hidden surprises.
Hybrid solar + storage, grid-tied or off-grid, industrial backup. Compatible with In-power, third-party inverters, and tested with Ewiser and Alteneva EMS platforms. We've delivered configurations that boost EV charging beyond grid limit (522 kWh BESS + 150 kW grid β 400 kW dynamic charge).
Get in touch and let us help you find the ideal energy storage solution for your needs.
Our services are available across the entire Central and Eastern European region.