Global Supplier of ST835CS-2HPowerStack ESS | Turnkey PV-Storage-Charging Solutions

Product Snapshot

Designed for the demanding landscape of commercial and industrial energy management, the ST835CS-2HPowerStack is a high-density, liquid-cooled BESS unit that redefines operational efficiency. Engineered with Tier-1 LFP (LiFePO4) cells and an advanced 3-level BMS (Battery Management System), this cabinet delivers a nominal energy capacity of 835 kWh and a continuous power output of 2HP (approx. 1.5 MW equivalent). It is the cornerstone for any high-performance micro-grid, EV supercharging hub, or industrial peak-shaving strategy.

As a premier global supplier, we provide end-to-end project backing, including 10-year performance warranty, local O&M support, and turnkey PV-storage-charging integration. The ST835CS-2HPowerStack is pre-commissioned for global shipping and adheres to UL 9540, IEC 62619, and UN 38.3 standards, ensuring immediate deployment readiness for international distributors and EPCs (Engineering, Procurement, and Construction).

Direct Sourcing Advantages

Sourcing the ST835CS-2HPowerStack directly from our ISO 14001:2024-certified facility provides significant leverage for B2B buyers and project developers:

• Supply Chain Security: Firm capacity allocation with 25-30 day FOB lead times from our Shanghai/Ningbo hub, supported by bulk sea freight consolidation.
• Lower LCOE (Levelized Cost of Energy): Our in-house inverter stack and passive component sourcing reduce upfront CAPEX by 12-15% compared to comparable branded units, accelerating payback periods to under 4 years for most C&I peak-shaving applications.
• Turnkey Solution Readiness: Each unit ships with pre-integrated EMS software, hybrid inverters, and optional DC-DC converters for direct solar coupling, simplifying on-site installation and reducing soft costs.
• Local O&M Backing: We partner with regional service providers in EU, MENA, and ASEAN to offer 4-hour remote diagnostics and next-business-day on-site support, ensuring project bankability and operational continuity.

Active BMS Balancing & Liquid Cooling Deep Dive

The ST835CS-2HPowerStack utilizes a proprietary active cell balancing topology that maintains voltage variance below 10mV across all 8,192 prismatic cells, maximizing usable capacity and extending cycle life beyond 8,000 cycles at 90% DoD. Unlike passive systems that waste excess energy as heat, our active balancer redistributes charge from higher-voltage cells to lower-voltage cells, achieving 98.5% round-trip efficiency.

The integrated smart liquid cooling system maintains each cell’s temperature within a ±1.5°C window, even at 1C continuous charge/discharge rates. This thermal precision prevents lithium plating, reduces capacity fade to just 2.5% after 5,000 cycles, and enables stable operation in ambient temperatures from -30°C to +55°C. The coolant loop is fully sealed and monitored by 6 distributed temperature sensors, with automatic flow adjustment based on real-time load profiles.

Verified Parameters

Below are the factory-certified electrical and mechanical specifications for the ST835CS-2HPowerStack. All metrics are validated under standard test conditions (25°C ambient, 0.5C charge/discharge rate).

Technical Feature	Specification
Battery Chemistry	Tier-1 LFP (LiFePO4), prismatic cells, UL 1973 certified
Nominal Energy (kWh)	835 kWh @ 25°C, 0.5C
Usable Energy (kWh)	751.5 kWh (90% DoD recommended)
Nominal Voltage (V)	1331.2 V DC (416s configuration)
Operating Voltage Range	1164.8 V – 1497.6 V DC
Max Continuous Power (MW)	1.5 MW (2HP equivalent)
Peak Power (10 sec)	1.8 MW (120% overload)
Cooling / Thermal Control	Smart liquid cooling, ±1.5°C cell uniformity, -30°C to +55°C ambient
Round-Trip Efficiency	≥ 98.5% @ 0.5C (DC side), ≥ 96% (AC side with PCS)
Cycle Life	8,000 cycles @ 90% DoD, 70% EOL (End of Life retention)
Dimensions (W x D x H)	1600 mm x 1800 mm x 2400 mm (including maintenance clearance)
Weight (approx.)	8,200 kg (without coolant)
Ingress Protection	IP65 (cabinet body), IP54 (ventilation ports)
Communication Protocols	Modbus TCP/IP, CAN 2.0, IEC 61850, OCPP 1.6-J (optional)
Safety Certifications	UL 9540, UL 9540A (test report), IEC 62619, IEC 61000-6-2/4, CE, RoHS, UN 38.3
Fire Suppression	Aerosol-based + Novec 1230, three-level trigger (cell/module/cabinet)
Grid Interface	On-grid / off-grid seamless switching (<20 ms), black-start capable

Micro-grid & Industrial Park Deployments

The ST835CS-2HPowerStack excels in three primary C&I scenarios that demand high reliability and fast ROI:

• EV Supercharging Hub Buffer: Deployed alongside 4-6 ultra-fast chargers (150-350 kW), the unit absorbs grid volatility, reduces demand charges by up to 40%, and enables battery-to-vehicle (B2V) discharge during peak tariff windows. The liquid cooling ensures continuous 1C operation even during back-to-back charging sessions.
• Industrial Peak Shaving: For manufacturing plants with 2-5 MW average loads, the ST835CS-2HPowerStack cuts peak demand by discharging at 2HP (1.5 MW) for 30-minute intervals, saving $18,000-$25,000 annually in demand charges alone (based on US commercial rates).
• Islanded Micro-grid Stability: In remote mining or agricultural sites, the unit provides grid-forming black-start capability and seamless transition between on-grid and off-grid modes (<20ms switching time). When paired with 1.2 MWp solar, it achieves 85% renewable penetration year-round.

Global Sea Shipping Security & Compliance

All ST835CS-2HPowerStack units are packaged according to UN 38.3 & IMDG Class 9 regulations for safe sea freight. Each cabinet is sealed in a desiccant-controlled, anti-static wooden crate with integrated shock logging (impact < 5G). We provide consolidated shipping options for large-volume orders, including door-to-door delivery with customs clearance support in over 40 countries. Full documentation—including commercial invoice, packing list, bill of lading, and certificate of origin—is prepared within 24 hours of vessel departure.

Certification & Lead Time Q&A

Q1: What certifications are included with the ST835CS-2HPowerStack for EU and North American markets?

The unit holds full UL 9540 (ESS), UL 1973 (cell), IEC 62619 (safety), IEC 61000-6-2/4 (EMC), and CE/RoHS certifications. For North America, we provide a complete UL 9540A fire test report. Certificates can be downloaded from our distributor portal or included with shipment.

Q2: What is the standard lead time for a 10-unit container order, and what payment terms do you offer?

Standard FOB Shanghai/Ningbo lead time is 25-30 calendar days after receiving deposit and signed PI. For stock-ready units (up to 5 pieces), lead time reduces to 10 days. Payment terms: 30% T/T in advance, 70% against copy of B/L. Irrevocable LC at sight is accepted for orders over $500k.

Q3: How does the 10-year performance warranty work, and what is excluded?

The warranty guarantees ≥70% of nominal energy retention (583 kWh) after 8,000 cycles or 10 years, whichever comes first. It covers all manufacturing defects, BMS/EMS firmware, and coolant system leaks. Exclusions: physical damage, unauthorized modifications, or operation outside specified temperature ranges. We operate a regional advanced replacement program for critical failures.

Q4: Can the ST835CS-2HPowerStack be paralleled for larger capacities, and what communication protocols are supported?

Yes, up to 10 units (8.35 MWh total) can be paralleled via high-speed CAN bus, with a master-slave EMS architecture. Communication protocols include Modbus TCP/IP, CAN 2.0, IEC 61850, and optional OCPP 1.6-J for EV charger integration. We provide a free EMS software license for system control and remote monitoring.

Q5: What O&M support is available after purchase, and are spare parts stocked regionally?

We offer three O&M tiers: Basic (email/remote diagnostics), Premium (4hr response + annual site inspection), and Full (next-day on-site + parts replacement). Spare parts (fuses, fans, coolant pumps, BMS boards) are stocked in our EU (Rotterdam), UAE (Jebel Ali), and SG (Jurong) warehouses, with 48-hour expedited shipping.