279 kWh.
Pure DC.
Zero Integration.
Sodium-Ion NFPP | 821V | 279 kWh | Open Protocol
The Series-DC delivers a fully pre-assembled 279 kWh sodium-ion DC battery block — engineered for integrators, EPCs, and OEMs who supply their own inverter and EMS. Three open protocols. Zero thermal runaway. Ship-ready in one pallet.
Complete DC Block
Everything You Need. Nothing You Don't.
The Series-DC ships as a fully assembled, tested DC battery block. Bring your own inverter, your own EMS, your own enclosure — we handle the chemistry, BMS, and safety. One SKU. One warranty. Zero integration guesswork.
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Sodium-Ion NFPP Battery Modules
279 kWh nameplate, 229 kWh usable at 85% DOD — prismatic cell format with zero thermal runaway risk
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Integrated Battery Management System (BMS)
US-designed BMS with Modbus TCP, CAN Bus, and RS-485 — continuous cell-level monitoring, protection, and SOC reporting
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Three Open Protocol Interfaces
Modbus TCP, CAN Bus 2.0B, and RS-485 — integrates with any third-party inverter, EMS, or SCADA platform out of the box
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Safety & Protection Systems
Over-voltage, under-voltage, over-current, over-temperature, and short-circuit protection — UL 1973 and IEC 62619 compliant
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Full Integration Documentation
Wiring diagrams, protocol specs, commissioning guide, and applications engineering support — included at no cost
Integration Architecture
Three Protocols.
One DC Block.
The Series-DC communicates over Modbus TCP, CAN Bus 2.0B, and RS-485 simultaneously — so your inverter, EMS, and SCADA platform all speak to the battery natively, without gateways or translators.
Industry-standard TCP/IP protocol for integration with SCADA systems, building management systems, and any IP-connected EMS or monitoring platform.
- Real-time SOC, SOH, voltage, current, temperature
- Cell-level monitoring via register map
- Remote charge/discharge control
- Alarm and fault status registers
- Compatible with all major SCADA platforms
High-speed CAN Bus 2.0B for direct integration with inverters and power conversion systems that use automotive-grade communication — common in EV chargers and industrial UPS systems.
- Up to 1 Mbit/s data rate
- Direct inverter-to-BMS communication
- Standard message frames for SOC and limits
- Charge/discharge current limit broadcast
- Compatible with SMA, SolarEdge, Victron, and more
RS-485 serial interface for integration with legacy EMS platforms, building automation systems, and industrial controllers that don't support Ethernet or CAN.
- Multi-drop bus — up to 32 devices per segment
- Long-distance runs up to 1,200 meters
- Noise-immune differential signaling
- Compatible with legacy BMS and SCADA
- Modbus RTU over RS-485 supported
Plug-and-Play Integration
Your Inverter.
Your EMS.
Our Battery.
The Series-DC is designed to disappear into your system architecture. Connect via any of the three protocols, configure the BMS register map, and your inverter sees a fully managed, safe DC source — no custom firmware, no proprietary gateways.
- Compatible with SMA, SolarEdge, Victron, Schneider, ABB, and all major inverter brands
- Works with any third-party EMS — no Coulomb software license required
- Full register map and protocol documentation provided at no cost
- Applications engineering support through commissioning — included
Technical Specifications
Built to Spec.
Engineered to Last.
The Series-DC is engineered for 20-year deployments in demanding commercial and industrial environments. Air-cooled operation from −40°C to +55°C means no HVAC, no moving parts, and no maintenance overhead.
| Nameplate Capacity | 279 kWh |
| Usable Energy (85% DOD) | 229 kWh |
| Nominal Voltage | 821 VDC |
| Voltage Range | 634–994 VDC |
| Max Charge Current | 170 A |
| Max Discharge Current | 170 A |
| Round-Trip Efficiency | >90% |
| Cycle Life | 6,000+ cycles |
| Calendar Life | 20 years (design target) |
| Self-Discharge | <3% per month |
| Chemistry | Sodium-Ion NFPP |
| Cell Format | Prismatic |
| Operating Temperature | −40°C to +55°C |
| Storage Temperature | −40°C to +60°C |
| Cooling Method | Air-cooled (no HVAC) |
| Enclosure Rating | IP54 Outdoor |
| Communication | Modbus TCP / CAN Bus / RS-485 |
| BMS | US-designed, cell-level |
| Thermal Risk | Zero runaway incidents |
| Warranty | 5 years system |
| Certifications | UL 1973, UL 9540, IEC 62619 |
| Protocols | 3 open (no proprietary) |
| EMS Required | Third-party (not included) |
| Inverter Required | Third-party (not included) |
Total Cost of Ownership
14% Lower TCO.
Bankable Economics.
Our sodium-ion technology delivers measurable savings through eliminated HVAC requirements, reduced degradation, and lower maintenance, insurance, and permitting costs — validated by real-world deployments, not laboratory projections.
Model Assumptions
| NFPP installed price delta | $16/kWh |
| Cycles per year | 365 |
| HVAC load delta | 90% |
| Insurance cost delta | 20% |
| Augmentation delta | 20% |
| O&M cost delta | 30% |
| Cell derating / cold temps | 75% |
| Discount rate / NPV calc | 8% |
Applications
Where the Series-DC Integrates
Custom BESS Builds
EPCs and system integrators use the Series-DC as the battery core in custom-configured commercial BESS — paired with their preferred inverter and EMS stack.
UPS & Critical Backup
Replace lead-acid and LFP UPS banks with a zero-maintenance sodium-ion DC block — no thermal runaway, no HVAC, no fire suppression overhead.
Renewable Integration
Pair with any grid-tied or off-grid solar inverter to build a complete solar-plus-storage system — the Series-DC handles the battery side, your inverter handles the AC conversion.
OEM & Microgrid Builds
OEMs building containerized energy storage systems and microgrid developers use the Series-DC as a modular, stackable battery block — multiple units in parallel for multi-MWh configurations.
Get Started
Ready to Integrate?
Our applications engineering team will provide the full integration documentation package, answer your technical questions, and support your team through commissioning — at no cost.