Question 1

How should DC output power cables be sized and calculated for the ETP48600-C11A1 operating at a 600A full load?

Accepted Answer

At 600A continuous rating, cable sizing must satisfy thermal ampacity and loop voltage drop limits (telecom standards enforce a round-trip drop of ≤0.5V). Using the loop formula: Cross-section S = (I × L) / (γ × ΔU), where I=600A, L is total round-trip cable length (meters), γ is copper conductivity (~57 m/(Ω·mm²)), and ΔU is allowable drop (0.5V). For a 10-meter one-way run (20m total loop), S = (600 × 20) / (57 × 0.5) ≈ 421 mm². In telecom site practice, dual runs of 240 mm² or triple runs of 150 mm² class-5/6 flexible copper cables are run in parallel, terminated with heavy-duty compression lugs, and torqued to specified busbar bolt ratings.

Question 2

What are the typical voltage threshold settings for LLVD (Load Low Voltage Disconnect) and BLVD (Battery Low Voltage Disconnect) in the SMU02 controller?

Accepted Answer

For standard 48V VRLA battery banks (24 cells in series with an end-of-discharge limit of 1.80V/cell), standard settings in the SMU02 are: LLVD1 (non-priority loads) is configured at 47.0VDC to 47.5VDC (approx. 1.96V–1.98V/cell) to shed non-essential loads like comfort climate or secondary carriers during early outage stages. BLVD (Battery Low Voltage Disconnect, or LLVD2 for critical loads) is set between 43.2VDC and 44.0VDC (1.80V–1.83V/cell) to prevent destructive deep discharge and plate sulfation. When using LiFePO4 telecom batteries, BLVD is typically raised to 44.5VDC–45.0VDC to harmonize with the battery pack BMS disconnect curves.

Question 3

What is the operating principle of battery temperature compensation in the ETP48600-C11A1, and how is it verified on site?

Accepted Answer

Lead-acid electrochemical potential is inversely proportional to electrolyte temperature: elevated temperatures increase charge acceptance and risk thermal runaway or dry-out if voltage is unadjusted, while lower temperatures increase internal resistance requiring higher float voltage. The SMU02 measures battery post temperature via an NTC probe and dynamically shifts system float voltage using: V_float = V_ref - (T_actual - 25°C) × N × K_comp, where N=24 cells and K_comp is typically 3.0 to 5.0 mV/(°C·cell). For K_comp = 3.5mV, the overall system adjustment is -84mV/°C. Verification: Measure the DC bus voltage with a calibrated DMM against the displayed SMU02 temperature; applying mild heat/cooling to the NTC probe must trigger an inverse shift in the rectifiers' regulated float voltage output without sensor fault alarms.

Key specifications	Value
Smart Monitoring Controller	SMU02C Central Network Controller Unit
AC Input Voltage	85VAC ~ 300VAC (3-Phase 380V / 220V Dual Source) VAC
Cooling System Architecture	Zoned front-to-rear air cooling
Nominal Output Voltage	-48VDC (-42V ~ -58V) VDC
Rated DC Output Current	600A (System Capacity 34.8kW)
Managed Rectifier Capacity	12 × 50A
Peak Energy Efficiency	≥96.8%
Form Factor Dimensions (HxWxD)	488 (11U) × 482 × 400 mm
Operating Temperature Range	-40°C ~ +65°C

Huawei ETP48600-C11A1 High-Capacity Subrack DC Power System (-48V 600A 11U)

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What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Telecom 4G/5G macro cellular base stations and distributed remote power sites

Enterprise-grade cloud data center mission-critical -48V DC power distribution lineups

Utility power grid dispatch centers and high-voltage substation DC switchgear rooms

Railway transit signaling, automated train control, and communications equipment rooms

Frequently asked questions

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Huawei ETP48600-C11A1 High-Capacity Subrack DC Power System (-48V 600A 11U)

Talk to RICEWIND

Clear support from selection to delivery

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Telecom 4G/5G macro cellular base stations and distributed remote power sites

Enterprise-grade cloud data center mission-critical -48V DC power distribution lineups

Utility power grid dispatch centers and high-voltage substation DC switchgear rooms

Railway transit signaling, automated train control, and communications equipment rooms

Frequently asked questions

How should DC output power cables be sized and calculated for the ETP48600-C11A1 operating at a 600A full load?

What are the typical voltage threshold settings for LLVD (Load Low Voltage Disconnect) and BLVD (Battery Low Voltage Disconnect) in the SMU02 controller?

What is the operating principle of battery temperature compensation in the ETP48600-C11A1, and how is it verified on site?

What is the tolerance standard and troubleshooting procedure for rectifier current sharing imbalance when running multiple units (e.g., R4850G2) in the ETP48600-C11A1?

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