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Transformer Solutions for Solar & Energy Storage (BESS)

Solar & New Energy Power Supply

 

Industry Challenges

Solar farms and BESS (Battery Energy Storage System) installations demand distribution transformers that operate reliably under three extreme conditions: wide DC-to-AC inversion voltage swings, harsh outdoor environments with high UV and dust exposure, and frequent load cycling between peak generation and zero-output night mode.

The Pain Point:

Ordinary distribution transformers degrade rapidly under these thermal-mechanical stress cycles, leading to insulation breakdown and premature failure — often within 3–5 years instead of the designed 25+ year solar plant lifespan.

PV Box-Type Substation in Solar Farm
 

Our Transformer Solution

We deploy cast-resin dry-type distribution transformers (SCB series) and hermetically sealed oil-immersed distribution transformers (S13-M series) purpose-engineered for PV and BESS step-up applications, typically 0.4kV/10kV–35kV.

SCB Series Dry-Type

Class F/H insulation (155°C/180°C temperature rise), inherently flame-retardant and self-extinguishing — ideal for containerized BESS installations where fire safety is paramount. The epoxy resin encapsulation eliminates partial discharge risk under inverter-induced harmonic distortion.

S13-M Oil-Immersed Series

Fully sealed corrugated tank design with nitrogen-blanketed oil preservation — zero oil contact with ambient air, preventing moisture ingress and oxidation. No-load loss as low as 65W for a 100kVA unit, meeting IE4-level efficiency standards critical for maximizing LCOE.

Key Advantage: Our distribution transformers incorporate double-sided M5-grade grain-oriented silicon steel cores and step-lap joint construction, reducing no-load current to ≤1.2% — significantly below the industry average of 1.8%–2.5%. This directly translates to lower parasitic losses during the 12+ hours of daily zero/minimal generation.

Recommended Products

SCB10 / SCB13
Cast-Resin Dry-Type

Capacity: 30–3150 kVA

Flame-retardant, harmonic-tolerant

S13-M
Sealed Oil-Immersed

Capacity: 50–2500 kVA

Ultra-low no-load loss, maintenance-free

ZGS11-Z.G
PV Box-Type Substation

Capacity: 100–1600 kVA

Integrated MV/LV + inverter bay

Operational Track Record

  • 120+ MW of installed PV distribution transformer capacity currently in operation across utility-scale solar farms.
  • Multiple 50MW solar-storage hybrid projects supplied with SCB13 dry-type transformers, operating continuously for 4+ years with zero insulation failure incidents.
  • Ongoing supply partnership with a major EPC contractor for annual delivery of 80+ units of S13-M sealed distribution transformers for distributed PV projects.
  • All units comply with IEC 60076-11 (dry-type) and IEC 60076-1/3 (oil-immersed), with type-test reports available.

Technical Parameter Quick Reference

Parameter SCB13 Dry-Type S13-M Oil-Immersed
Rated Capacity 30–3150 kVA 50–2500 kVA
HV Rating 6/10/20/35 kV 6/10/20/35 kV
LV Rating 0.4 kV 0.4 kV
Cooling AN/AF ONAN
No-Load Loss (100kVA) ≤200W ≤65W
Vector Group Dyn11 / Yyn0 Dyn11 / Yyn0
Insulation Class F / H A
Temperature Rise 100K (Class F) 65K