XEYAR Sodium-Ion BESS.
Zero Lithium. Zero Cobalt. Zero Compromise.
Lithium-free electrochemical storage built on polyanion cathode and hard-carbon anode in a non-flammable electrolyte. 20,000+ cycles, 25-year design life, 100% usable depth-of-discharge, and a −40°C to +60°C operating envelope. FEOC-compliant pathway for the 30% US Investment Tax Credit. Built for energy-dominant duty cycles.
A Sodium-Ion BESS Needs Sodium-Ion Software.
Sodium-ion cells have distinct open-circuit voltage curves, distinct degradation mechanisms, and a thermal envelope that lithium BMS firmware was never written for. A generic BMS bolted onto Na-ion cells produces wrong SOC, wrong SOH, and wrong charge limits at temperature extremes. XEYAR Nexus patents the dedicated sodium-ion control layer — and the FEOC compliance manager that turns Na-ion's supply-chain advantage into IRA-eligible projects.
The XEYAR Nexus Provisional Patent Application covers the unified intelligent management platform for energy storage and EV charging infrastructure. Its 45 claims span 11 technical modules, including the chemistry abstraction layer, hybrid orchestration engine, dedicated sodium-ion battery management module, OCPP 2.0.1 bidirectional charger management, virtual power plant dispatch engine, FEOC compliance manager, and federated learning analytics.
For a XEYAR Sodium-Ion BESS deployment, the most relevant patented module is §7.5 — Sodium-Ion Battery Management Module. The module implements model-based SOC estimation calibrated to Na-ion's distinct OCV curves, impedance-based SOH tracking calibrated to sodium-ion degradation mechanisms (not graphite SEI growth), and temperature-compensated charge/discharge limits across the −40 °C to +60 °C operating envelope. None of these are calibrations a lithium BMS exposes — they are sodium-ion-specific algorithms.
The Nexus patent also covers §7.10 — the Compliance Manager, which automates FEOC supply-chain attestation for the US 30% Investment Tax Credit. For Na-ion deployments, this is where the chemistry's earth-abundant supply chain becomes a verifiable, automated, audit-ready compliance pathway — not a marketing claim.
- Claims
- 45 total
- Technical Modules
- 11
- Independent Claims
- 1 · 15 · 25 · 35
- Na-ion BMS Module
- §7.5
- Compliance Manager
- §7.10 · FEOC
- Inventor
- Sal Möten
- Parent Application
- Cluster (39 claims)
- Status
- Patent Pending
What Nexus Patents — for Na-ion
Model-Based SOC for Na-ion OCV
Patented SOC estimation calibrated to sodium-ion's distinct open-circuit voltage curves. OCV-lookup combined with coulomb counting and periodic rest-period recalibration — none of it transferable from a lithium codebase.
BMS · SOCImpedance-Based SOH (Na-ion-Specific)
Patented State-of-Health tracking calibrated to sodium-ion degradation mechanisms. Lithium-ion SOH algorithms model SEI growth and graphite expansion — irrelevant to Na-ion. The Na-ion SOH model tracks polyanion-cathode aging instead.
BMS · SOH−40 °C / +60 °C Temperature Compensation
Patented temperature-compensated charge/discharge limits across the full Na-ion envelope. No HVAC-dependent derating, no climate-specific firmware, no separate cold-climate SKU. One BMS image, every climate.
BMS · ThermalFEOC Compliance · 30% US ITC
Patented compliance module that automates supply-chain attestation for FEOC (Foreign Entity of Concern) audit and the US 30% Investment Tax Credit under the Inflation Reduction Act. Audit trail, AHJ documentation, insurance-carrier reporting — generated, not assembled.
Compliance · ITCVPP Dispatch · Energy Arbitrage
Patented automated participation in CAISO, ERCOT, PJM, NYISO, and National Grid ESO via OpenADR 2.0 and IEEE 2030.5. Sodium-ion's energy density and 100% usable DoD make it the right chemistry for arbitrage and demand-response revenue tiers.
Grid ServicesRevenue Distribution Engine
Patented automated settlement among platform operator (XEYAR), regional aggregator, certified installer, and asset owner. Configurable percentage splits per deployment. Metered energy contributions, availability tracking, and grid-service revenues distributed without manual reconciliation.
Software · RevenueNone of the cited prior art references, alone or in combination, discloses: (1) a unified chemistry abstraction layer managing both electrostatic and electrochemical (sodium-ion) storage with opposite thermal coefficients; (2) time-domain hybrid dispatch routing sustained loads to electrochemical storage with thermal-aware allocation; (3) OCPP 2.0.1 bidirectional charger management integrated with VPP dispatch and sodium-ion storage; (4) automated FEOC compliance attestation integrated with energy storage operations; and (5) federated learning for fleet-wide predictive maintenance across sodium-ion deployments.
Sodium-Ion. Electrochemistry, Rebuilt.
A next-generation electrochemical cell built on earth-abundant sodium, polyanion cathode materials, and hard-carbon anodes. Zero cobalt, zero lithium, zero nickel, zero thermal runaway — engineered for sustained energy delivery across the widest temperature envelope in the industry.
How it works
Sodium-ion chemistry operates on the same intercalation principle as lithium-ion — but substitutes sodium (Na⁺) for lithium (Li⁺) as the charge-carrying ion. XEYAR Na-ion cells pair a polyanion cathode with a hard-carbon anode in a non-flammable electrolyte, delivering stable performance across a 2.4–3.4 V per-cell window (2.95 V nominal).
Sodium is approximately 500× more abundant than lithium in the earth's crust. There is no cobalt, no nickel, and no lithium in the cell — and none of the material scarcity, price volatility, or FEOC exposure that comes with them. The chemistry is intrinsically non-thermal-runaway, ships non-hazardous, and remains code-compliant in occupied indoor installations without dedicated fire suppression.
The real engineering breakthrough is structural: the polyanion cathode exhibits approximately 4% volumetric expansion during cycling — versus ~8% for NTP and ~30% for graphite. The anode and cathode operating potentials sit strictly within the electrolyte's electrochemical window, producing zero SEI/CEI layer formation, zero parasitic side reactions, and zero active-material consumption. The capacity-fade mechanisms that limit lithium-ion cycle life simply do not exist in this system.
Cell architecture
Polyanion Cathode
3D framework-stabilized material with reversible sodium-ion channels. ~4% volume change during cycling — a fraction of graphite's ~30% — is the structural basis for ultra-long cycle life.
Hard-Carbon Anode
Disordered carbon structure provides stable Na⁺ storage sites. No lithium plating at sub-zero temperatures, no dendrite formation, no internal-short risk.
Non-Flammable Electrolyte
Engineered for wide-temperature operation and non-flammability. Thermal decomposition of electrode materials exceeds 1000 °C — orders of magnitude above typical abuse conditions.
XEYAR BMS (ESMS 125a)
Dedicated Battery Management System monitors SOC (OCV-lookup + coulomb counting + rest-period recalibration), SOH via impedance, cell temperature, and faults. Enforces 2.4–3.4 V per-cell voltage windows.
Full Technical Specifications.
Every parameter behind the 14-year North American warranty. These specs reflect the system-level performance of XEYAR Sodium-Ion BESS as deployed inside the UL 9540 3rd Edition DC ESS boundary, governed by the ESMS 125a management layer.
Why XEYAR Sodium-Ion Wins.
Six engineering and supply-chain properties that deliver the lowest LCOS for energy-dominant applications.
Widest Thermal Envelope
Full rated performance from −40°C to +60°C. Unheated enclosures in Manitoba winters, Dubai summers, and Arizona rooftops — one chemistry, no climate-specific SKUs.
Zero SEI · Zero Side Reactions
Anode and cathode operate strictly within the electrolyte's electrochemical window. Result: zero SEI/CEI layer formation, zero parasitic reactions, zero active-material consumption. The capacity-fade mechanisms that limit lithium-ion simply don't exist here.
Scales to Gigawatt-Hours
Energy density (~59 Wh/kg) sufficient for residential 6.9 kWh all the way to 2,362 kWh containerized BESS. UL 9540A Pass removes the 50 kWh-per-unit cap — a single certified enclosure aggregates to 144+ kWh.
FEOC-Ready for the 30% ITC
Sodium-ion bypasses lithium supply-chain FEOC exposure. XEYAR's non-Chinese BMS and US/CA/EU-origin PCS pathway supports compliance with the 30% US Investment Tax Credit for qualifying projects.
Zero Thermal Runaway
Polyanion cathode + non-flammable electrolyte. Thermal decomposition above 1000°C. UL 9540A Pass. Code-compliant for indoor and MURB installation without dedicated fire suppression.
100% Usable DoD
20,000+ cycles at 50% DoD or full 100% DoD with no calendar penalty. The cell is sized for the energy you need — not 130–150% (lithium) — directly improving capex and LCOS.
FEOC Compliance & the 30% ITC.
Sodium-ion bypasses the lithium supply-chain exposure that creates compliance risk for lithium-based projects under the Inflation Reduction Act.
FEOC compliance pathway for qualifying projects
The US 30% Investment Tax Credit requires that batteries, BMS, and key components be sourced outside Foreign Entity of Concern jurisdictions. XEYAR's non-Chinese-origin BMS, US/CA/EU-origin PCS qualification pathway, and the inherent absence of lithium / cobalt / nickel in the cell create a structural advantage over lithium-based competitors. Final compliance depends on project-specific BOM and origin documentation; XEYAR provides full supply-chain attestation at project engineering.
Certified to Every Applicable Standard.
XEYAR Sodium-Ion BESS carries certifications for North American, European, GCC, MENA, and Indian markets. The DC ESS boundary is fully UL 9540 3rd Edition listed; subsystems carry independent listings.
XEYAR Sodium-Ion BESS is selected when the application is energy-dominant: multi-hour commercial and grid-scale BESS (up to 2,362 kWh containerized); solar-plus-storage arbitrage (charge midday, discharge evening peak); data-center UPS sustained backup (600 kW × 6–10 minutes); residential self-consumption (from 6.9 kWh per unit, stackable); off-grid microgrids for remote and indigenous deployments with diurnal solar; FEOC / 30% US ITC projects; and cold-climate indoor deployments where −40°C operation and non-thermal-runaway behavior open code-compliance options that lithium cannot match.
The Technical Questions We Hear Most.
Direct, engineering-grade answers to common questions about XEYAR Sodium-Ion BESS — the chemistry, the warranty, FEOC compliance, and how to know when sodium-ion is the right answer for your project.
How is sodium-ion different from lithium-ion (LFP)?
Sodium-ion uses sodium (Na⁺) instead of lithium (Li⁺) as the charge-carrying ion. Sodium is approximately 500× more abundant than lithium in Earth's crust and is not subject to the same supply-chain or geopolitical constraints.
The XEYAR Na-ion cell pairs a polyanion cathode with a hard-carbon anode in a non-flammable electrolyte — yielding 20,000+ cycles, 25+ year design life, −40°C operation, 100% usable DoD, and intrinsic non-thermal-runaway behavior. Every lithium chemistry, including LFP, carries thermal runaway risk and triggers NFPA 855 / IBC fire-code restrictions in indoor and occupied environments.
Why does sodium-ion last 20,000+ cycles when lithium-ion lasts only 3,000–6,000?
The polyanion cathode in XEYAR Na-ion exhibits approximately 4% volumetric expansion during cycling — versus ~30% for graphite in lithium-ion. The anode and cathode operating potentials sit strictly within the electrolyte's electrochemical window.
The result: zero SEI/CEI layer formation, zero parasitic side reactions, zero active-material consumption. The capacity-fade mechanisms that limit lithium-ion cycle life simply do not exist in this system.
Does XEYAR Sodium-Ion BESS qualify for the 30% US Investment Tax Credit?
Sodium-ion bypasses the lithium supply-chain FEOC (Foreign Entity of Concern) exposure that creates compliance risk for lithium-based projects. XEYAR's non-Chinese-origin BMS and US/CA/EU-origin PCS qualification pathway supports compliance with the 30% US ITC for qualifying projects under the Inflation Reduction Act.
Final compliance depends on project-specific BOM and origin documentation; XEYAR provides full supply-chain attestation at project engineering.
What temperatures can XEYAR Sodium-Ion BESS operate in?
−40°C to +60°C operating envelope. The 10–35°C range is recommended for optimal performance, but full rated capacity is available across the entire envelope without active thermal conditioning for most deployments.
This enables unheated enclosures in Manitoba winters, Dubai summers, and Arizona rooftops with one chemistry and no climate-specific SKUs — a meaningful capex and maintenance simplification compared to lithium-ion systems that require HVAC and de-rating in extreme conditions.
What is the warranty on XEYAR Sodium-Ion BESS?
10-year standard warranty globally. For North American deployments, a 14-year extended warranty is available, administered entirely by XEYAR for FEOC compliance.
The warranty covers defined capacity-retention thresholds over rated cycle life. Design life is 25+ years — the warranty is well within the operational lifetime, not at the limit of it.
What applications is XEYAR Sodium-Ion BESS best suited for?
Energy-dominant applications: multi-hour commercial and grid-scale BESS (up to 2,362 kWh containerized); data-center UPS with sustained backup (600 kW × 6–10 minutes); solar-plus-storage arbitrage (charge midday, discharge evening peak); residential self-consumption (from 6.9 kWh per unit, stackable); off-grid microgrids; and battery-buffered EV charging where sessions extend beyond a few minutes of sustained high-power draw.
The 100% usable DoD and 20,000+ cycle life produce the lowest LCOS in this class of duty cycles.
Is XEYAR Sodium-Ion BESS code-compliant for indoor or MURB installation?
Yes. Sodium-ion is classified as non-thermal-runaway (UL 9540A Pass), meeting NFPA 855, IBC, IFC, NEC Article 706, CEC, and CSA requirements for indoor and multi-unit residential deployment without dedicated fire suppression infrastructure.
Thermal decomposition of electrode materials exceeds 1000°C — orders of magnitude above any reasonable abuse condition. The non-flammable electrolyte and zero off-gassing further support occupied-space deployment in data centers, hospitals, and high-rise residential buildings.
What is the energy density of XEYAR Sodium-Ion BESS?
~59 Wh/kg at the cell level — sufficient for installations from 2.3 kWh residential up to 2,362 kWh containerized BESS, and unlimited via aggregation of multiple containers.
Energy density is lower than high-end NMC lithium (200–300 Wh/kg) but on par with mature LFP for stationary applications. For stationary BESS the trade-off favors sodium-ion: longer life, better safety, FEOC compliance, and 100% usable DoD.
Ready to deploy
lithium-free, FEOC-ready energy storage?
Every XEYAR Sodium-Ion BESS project starts with a free engineering consultation. Share your site profile, daily energy throughput, duty cycle, and FEOC / 30% ITC requirements — our team will size the system for the lowest lifetime LCOS for your specific use case. Transparent math, 100% usable DoD, full supply-chain attestation.