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Huawei / Indoor power systems

Huawei S4875G1 Solar Rectifier Equipment information & support

The Huawei S4875G1 is a high-efficiency, hot-swappable 1U DC-DC telecom solar converter module engineered with state-of-the-art Maximum Power Point Tracking (MPPT) topology, transforming high-voltage photovoltaic array input ranging from 100V to 430V DC into a regulated -48V DC bus power with up to 98.5% industry-leading efficiency.

Equipment information

Brand
Huawei
Equipment model
Huawei S4875G1 Solar Rectifier
Equipment type
Indoor power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
Huawei S4875G1 Solar MPPT Rectifier Module 4000W 75A -48V Telecom Power Official Studio Photo 3

Information below comes from the current product catalogue. Confirm the controller, software version and configuration of the installed equipment separately.

Rated Output Power
4000W PV Solar DC Conversion Power
Physical Form Factor
1U Standard High-Density Hot-Pluggable Module
Rated Output Current
75A (-48V DC Continuous High Current)
PV Solar Input Range
100V DC ~ 430V DC (MPPT High Efficiency Tracking)
Power Conversion Efficiency
≥ 98.5% (Industry Leading MPPT Efficiency)
Cooling Method
Built-in Intelligent Variable Speed Fan

Alarms & troubleshooting

PV_IN_FAIL (PV Input Abnormal)
Green Power LED off, Yellow Alarm LED solid on
PV string DC input voltage below startup threshold (<58V DC), exceeds maximum operating limit, PV string polarity reversed, or input breaker tripped.
1. Use a digital multimeter to measure open-circuit voltage (Voc) and verify correct DC polarity at the module input terminals. 2. Inspect upstream PV combiner box, DC surge protector, and circuit breaker status for trips or blown fuses. 3. Check solar array strings for physical shadowing, surface contamination, or open-circuit cabling faults.
OUT_OVP (DC Output Overvoltage Lockout)
Green Power LED off, Red Fault LED solid on
Internal voltage regulation loop failure causing output voltage to exceed hardware safety threshold (typically >59.5V DC), triggering latching shutdown.
1. Unlock and pull the faulty rectifier module out of the subrack slot to disconnect it. 2. Wait 3 minutes for internal high-voltage capacitors to fully discharge, then re-insert to clear lockout. 3. If the module triggers overvoltage lockout again while bus voltage is normal, replace the module.
OVER_TEMP (Over-Temperature Shutdown & Derating)
Yellow Alarm LED solid on (derating); Green LED off and Yellow LED solid on upon thermal shutdown
Module air intake clogged with dust, ambient cabinet temperature exceeding 65°C, internal airflow obstruction, or heavy heatsink fouling.
1. Inspect cabinet cooling units (fans/heat exchangers) and verify cabinet ambient temperature is within normal limits (<55°C). 2. Remove the module and use low-pressure compressed air to clean front air vents, dust filters, and rear heatsink fins. 3. Ensure adequate clearance around module airflow path and verify no hot air recirculation inside the enclosure.
FAN_FAIL (Fan Locked-Rotor & Speed Fault)
Red Fault LED solid on
Fan blades mechanically blocked by foreign debris, fan power cable loose/unplugged, or tachometer feedback circuit failure.
1. Remove the module, visually check for physical obstructions in fan blades, and gently spin by hand to verify smooth rotation. 2. Inspect the internal 4-pin fan connector on the control board for loose contacts or damaged pins. 3. Re-seat module and observe startup self-test; if fan fails to rotate or report speed, replace the fan assembly or module.
COMM_FAIL (CAN Communication Loss)
Green Power LED blinking (0.5 Hz), Yellow Alarm LED blinking
Poor contact on module backplane connector pins, host controller (SMU) CAN interface failure, missing termination resistor, or address conflict.
1. Eject the module, inspect rear gold finger pins for bending or corrosion, clean with isopropyl alcohol, and firmly re-seat. 2. Access the site controller (SMU02B/C) interface and verify module registration, slot numbering, and CAN link status. 3. Inspect backplane ribbon cables and termination resistor integrity; trigger a module re-scan from the controller UI.

Access Complete Maintenance & Full Alarm Troubleshooting Manual

This page lists high-frequency critical alarm codes commonly encountered in field maintenance. Comprehensive manufacturer troubleshooting matrices, board-level repair guides, detailed electrical schematics, and firmware commissioning manuals are delivered alongside equipment upon formal project procurement, accompanied by dedicated FAE technical support.

Contact Account Manager for Full Manual

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