Warranty Policy - YUEGU Energy Storage Systems

5-Year Technical Warranty

Guaranteed performance covering manufacturing integrity, cell chemistry stability, and BMS logic. Backed by rigorous R&D validation and traceable production standards.

COVERAGE OVERVIEW

Performance Parameters

5

Years

Valid from shipment date for modules, BMS hardware, and structural components.

6000

Cycles

Or 6000 full charge/discharge cycles at 0.5C, whichever occurs first.

≥80%

SOH Guarantee

Minimum State of Health (SOH) retention under specified datasheet conditions.

Term Definition: Warranty activates on the invoice shipment date. Valid for 5 years or 6000 equivalent cycles. We guarantee ≥80% rated capacity retention assuming operation within defined temperature and C-rate limits.

TECHNICAL SCOPE

Component Coverage

Protection against manufacturing deviation and material defects under standard protocol.

Battery Cells & Modules

Covers LiFePO4 cell consistency, internal resistance stability, and laser weld integrity.

  • ✓ SOH degradation exceeding linear projection
  • ✓ Internal short/open circuit anomalies
  • ✓ Busbar connection and laser weld defects
  • ✓ Voltage deviation beyond passive balancing logic

Battery Management System (BMS)

Hardware reliability for PCB control units, analog front-ends (AFE), and MOSFET/relay arrays.

  • ✓ Master/Slave board component failure
  • ✓ NTC temperature and voltage sensor precision
  • ✓ CAN/RS485 communication IC defects
  • ✓ Solid-state or mechanical relay malfunction

Structure & Enclosure

Mechanical integrity of the chassis, ingress protection (IP) seals, and mounting points.

  • ✓ Structural deformation or stress cracking
  • ✓ Terminal block and connector insulation
  • ✓ Gasket failure compromising IP rating

Active Thermal Control

Functionality of forced-air cooling or liquid heating subsystems where applicable.

  • ✓ Fan motor operational life
  • ✓ Heating element continuity
  • ✓ Thermostat and control relay logic
LIMITATIONS

Exclusion Criteria

Warranty is voided by operation outside engineered parameters or unauthorized intervention.

❌ Installation Non-Compliance

  • Reverse polarity or short circuit during commissioning
  • Ingress damage from installing indoor models outdoors
  • Insufficient thermal clearance or ambient airflow
  • Physical impact damage during transport/mounting

❌ Electrical Parameter Violation

  • Inverter settings conflicting with battery datasheet
  • Deep discharge bypassing BMS low-voltage cutoff
  • Current throughput exceeding C-rate specifications
  • Integration with incompatible power conversion systems

❌ Environmental Stress

  • Operation outside -10°C to +50°C thermal envelope
  • Exposure to corrosive industrial or marine atmospheres
  • Force majeure (fire, flood, grid surges, lightning)
  • Long-term storage without maintenance charging

❌ Unauthorized Modification

  • Disassembly by uncertified personnel
  • Third-party firmware flashing or BMS replacement
  • Tampering with serial number labels or safety seals
  • Integration of unapproved peripheral devices

❌ Normal Wear & Tear

  • Cosmetic blemishes not affecting structural integrity
  • Expected capacity loss within guaranteed SOH limits
  • Connector oxidation due to lack of maintenance
  • Operational noise within acoustic standards
SERVICE PROTOCOL

RMA & Claim Procedure

Standardized workflow to ensure rapid diagnosis and system restoration.

1

Incident Reporting

Submit technical data to support (charles@yvalleyenergy.com / +86 131 0672 8908):

  • Product Serial Number (S/N)
  • Proof of Purchase / Commercial Invoice
  • Error logs, alarm codes, or installation photos
2

Technical Diagnostics (1-2 Days)

Engineering analysis of BMS logs and inverter parameters to identify fault origin. We determine if the issue is hardware failure or configuration error.

3

Warranty Validation

Verification of warranty status, usage history, and environmental conditions. Confirmation that the failure mode falls within coverage scope.

4

Component Dispatch (3-7 Days)

Immediate express shipment of replacement parts or modules. YUEGU covers logistics costs for valid claims. Defective units may be recalled for lab analysis.

5

Recommissioning Support

Remote engineering guidance for component replacement and system restart. Post-service monitoring ensures stability.

LIFECYCLE SERVICES

Post-Warranty Support

Designed for 15+ year service life. We ensure operational continuity beyond the warranty period.

Spare Parts Integrity

Inventory of critical PCB and cell components maintained for 15 years post-production.

Technical Consultation

Lifetime engineering access for troubleshooting, system expansion, and optimization.

Maintenance Services

Cost-effective out-of-warranty repairs, module balancing, and refurbishment.

Firmware Evolution

Ongoing updates for latest inverter protocols and grid compliance standards.

Technical Inquiries

Contact our engineering team for detailed warranty terms, specific use-case evaluation, or claim initiation.

Contact Support