1. Core Electrical Specifications and Topology Architecture
The Huawei R4850G2 is a globally deployed benchmark single-phase high-frequency switch-mode telecom rectifier module engineered for mission-critical wireless macro base stations and edge compute power infrastructures. Operating from a nominal 200VAC to 240VAC single-phase grid input, a single module outputs up to 3000W of regulated DC power (calibrated at -53.5VDC nominal with a continuous rating of 50A/56.1A), achieving a peak conversion efficiency surpassing 96.0% and meeting the highest international telecom power efficiency standards.
The rectifier delivers exceptional grid resilience with an ultra-wide AC input range spanning 85VAC to 300VAC. Between 85VAC and 176VAC undervoltage conditions, an internal digital signal processor (DSP) activates linear derating protection to sustain uninterrupted DC output during brownouts or erratic generator power. It features 3000VAC input-to-ground galvanic isolation and continuous output voltage adjustment between -42VDC and -58VDC, catering comprehensively to lead-acid and lithium iron phosphate (LiFePO4) battery charging curves.
Electrical Rating: Single-phase 200~240VAC nominal input, -53.5VDC/50A output (3000W continuous)
Wide Input Resilience: 85VAC~300VAC operational window with adaptive linear derating between 85~176VAC
High Efficiency: Peak conversion efficiency ≥96.0%, Power Factor (PF) ≥0.99, Total Harmonic Distortion (THD) ≤5%
Thermal Management: Variable-speed cooling fans, acoustic pressure ≤55 dBA, wide operational range -40°C to +75°C
2. Subrack Topology & Monitoring System Compatibility Matrix
Verifying backplane current capacity and controller protocol compatibility is the foremost step when integrating the R4850G2 into live telecom plants. Built in a compact 1U standard form factor, the module is native to Huawei's flagship embedded power systems.
Standard deployments include the 1U ETP4830, the 2U ETP4890-A2, and high-capacity multi-unit cabinets such as ETP48200-C5B6 and ETP48300-C9A1. For supervision, the R4850G2 interfaces seamlessly across an isolated backplane CAN bus with Huawei SMU controllers (SMU01A, SMU01B, SMU02B, SMU02C), enabling automated addressing, dynamic active current sharing (current imbalance ≤±5%), and real-time alarms. In standalone configurations without a controller, the module autonomously regulates its default output at -53.5VDC.
Compatible Subracks: ETP4830, ETP4890, ETP48150, ETP48200, MTS9000 modular power systems
Monitoring Support: Full protocol alignment with SMU01 and SMU02 series controllers over CAN bus
Autonomous Operation: Maintains safe default -53.5VDC float voltage when disconnected from supervisory controllers
Parallel Scalability: Supports hot-swappable parallel interconnection of up to 30 modules on a shared DC bus
3. Retrofit Strategies and Capacity Expansion for Legacy Sites
Upgrading legacy telecom sites by substituting standard-efficiency modules (such as R4850N1, R4850N2, or legacy R4830G1) with the high-efficiency R4850G2 delivers substantial operational savings. Transitioning from 91%~92% to over 96% efficiency curtails heat dissipation by nearly 50%, mitigating cabinet thermal load and reducing site PUE.
Engineers must address key physical constraints during upgrades. First, avoid permanent current-sharing disparities by standardizing all modules in a common power shelf to identical R4850G2 hardware revisions. Second, recalculate upstream AC circuit breakers: at 3000W full load, single-phase input draw approaches 15A~16A, requiring upstream breakers rated at 25A or 32A Type-C. Third, confirm DC busbar cross-sectional area and battery charge current limits within the SMU configuration.
Energy Efficiency Yield: Swapping out legacy R4850N units yields a 4%~5% power gain and significant thermal relief
Current Sharing Best Practice: Deploy uniform batches of R4850G2 modules to ensure optimal load balance
AC/DC Sizing Verification: Upgrade upstream AC breakers to 25A/32A and verify DC copper busbar thermal ratings
Mechanical Safety: Ensure front-panel latching mechanisms engage fully to prevent contact fretting and arcing
4. Refurbished Unit Inspection, Anti-Counterfeit & Quality Standards
Due to sustained global demand for legacy site maintenance, refurbished and secondary-market R4850G2 units circulate widely. Low-tier refurbishments often suffer from re-cased oxidized boards, shaved integrated circuits with fake silkscreen prints, and missing internal filter components.
RICEWIND recommends a five-point physical and electrical verification protocol: inspect outer casing stamping and high-resolution laser QR serial numbers; check rear gold fingers and power blades for excessive insertion scratches or plating erosion; verify conformal coating integrity and electrolytic capacitor safety vents; and mandate a rigorous 4-hour full-load (50A continuous) burn-in testing cycle to ensure ripple voltage remains below 200mVp-p.
Nameplate & Laser Tag Verification: Validate laser serial numbers against internal electronic barcodes
Connector Integrity: Inspect gold-finger edge contacts and power pins for thermal oxidation or micro-pitting
Component Health: Examine primary bulk capacitors for venting or electrolyte residue, ensuring intact factory coating
Burn-in Testing Protocol: Enforce a mandatory 4-hour continuous 50A full-load resistive testing before deployment
5. Engineering Technical Support & Global Supply Services
RICEWIND maintains ready inventory of new and certified refurbished telecom rectifiers and subracks from top manufacturers including Huawei, Vertiv, and ZTE. Every refurbished unit undergoes ultrasonic cleaning, component-level health inspection, and full-load burn-in validation to provide unmatched reliability at competitive pricing.
For technical datasheets, subrack compatibility consultations, or volume project quotes, contact our specialized engineering team directly.
Technical Engineering Support: lee@ricewind.com
Global Hotline & Instant Messaging: +86 17621197907
Quality Assurance: Certified full-load testing reports and comprehensive warranty coverage included
Engineering Procurement & Technical Desk
For technical datasheets, custom power topology design, or volume export quotations, reach out to HEFENGQI engineers.
