Industry Solution
Solar Power Distribution Solutions
End-to-end electrical balance-of-system solutions for solar PV plants — from inverter AC output to grid interconnection point.
Solar photovoltaic (PV) power plants require specialized electrical infrastructure to convert inverter output into grid-compatible power. The journey from DC solar arrays to AC grid connection involves multiple critical components: inverter step-up transformers, medium-voltage (MV) switchgear, ring main units (RMU), reactive power compensation, and SCADA monitoring systems.
Ziyao Power provides a complete electrical BoS (Balance of System) package for solar developers and EPC contractors. Our IEC-certified equipment is designed for the unique demands of solar applications: bi-directional power flow, harmonic-rich inverter output, wide temperature variations in desert/field installations, and compliance with stringent grid codes across Middle East, Africa, and Asia.
Whether you're building a 50MW utility-scale solar park in Saudi Arabia, a 5MW commercial rooftop system, or an off-grid solar mini-grid in rural Africa, we configure the right combination of transformers, switchgear, and protection equipment — all pre-tested, pre-documented, and delivered to site on schedule.
Global Solar Capacity Expansion
Over 500GW of new solar PV is expected by 2030. Each MW requires approximately 1.1MVA of transformer capacity plus associated switchgear and grid connection equipment.
Grid Code Compliance
Modern solar plants must meet strict grid codes: fault ride-through (FRT), reactive power capability, power quality standards (IEEE 519), and communication protocols (IEC 61850). Our equipment is pre-tested for compliance.
Cost-Per-Watt Optimization
EPCs are under intense pressure to reduce BoS costs. Our integrated transformer + switchgear packages minimize field installation work, reduce civil costs, and simplify commissioning.
Extreme Environment Operation
Solar plants in desert (Middle East), high-altitude (Andes), tropical (SE Asia), and coastal environments need equipment rated for extreme temperatures, humidity, dust, and salt spray.
Hybrid & Storage Integration
Solar + BESS (Battery Energy Storage System) projects need bi-directional transformers and switchgear capable of managing power flow in both directions.
Accelerated Project Timelines
Solar developers face tight COD deadlines with LD penalties. Our pre-engineered, pre-tested packages reduce on-site commissioning time by 40-60%.
Step-Up Transformers
S22-MOil-immersed S22-M series with dual-voltage taps, designed for inverter-side harmonics, bi-directional flow, and outdoor installation at solar array field edge.
Available with K-factor rating for harmonic-heavy inverter output and electrostatic shielding between windings.
View S22-M Series →MV Ring Main Units (RMU)
RMUSF6-insulated RMUs for solar array field MV collection network. Modular, maintenance-free, remote-controllable for SCADA integration.
MV Metal-Clad Switchgear
KYN28KYN28-12 MV switchgear for main solar substation, utility interconnection, and feeder protection with microprocessor relays.
Prefabricated Substation (PV Station)
YBYB Series solar skid — transformer + MV switchgear + LV AC board pre-installed in a weatherproof containerized housing. Plug-and-play at site.
Containerized PV station reduces site civil work, wiring, and commissioning time by 60%.
View YB Series →Utility-Scale Solar Farm
50MW–500MW ground-mount PV plants with 33kV collector network, main step-up substation, and grid interconnection at 132kV/220kV.
Commercial Rooftop Solar
500kW–5MW rooftop installations with LV AC combiner panels, step-up to 11kV, and utility connection.
Solar + Battery Storage
Hybrid PV+BESS plants with bi-directional transformers managing charge/discharge cycles and grid export.
Agri-Voltaics
Agricultural solar systems combining crop production with PV generation — compact outdoor transformers with minimal footprint.
Remote Mini-Grids
Off-grid and island solar systems with containerized substations for rapid deployment in remote locations.
Floating Solar PV
Water-surface solar arrays requiring humidity-resistant, corrosion-protected electrical equipment on floating platforms.
Reference: 100MW Solar Farm — Electrical BoS
Typical electrical balance-of-system configuration for a 100MW utility-scale solar PV plant with 33kV MV collection network and grid interconnection. This is a reference configuration based on industry standards, not a specific customer project.
| Equipment | Qty | Specification |
|---|---|---|
| Inverter Step-Up Transformers | 40 units | S22-M 2500kVA, 0.8/33kV, Dyn11, ONAN, outdoor |
| MV RMU (Field Collection) | 10 sets | 33kV, 3-way SF6 RMU, 630A, extensible |
| Main Power Transformer | 2 units | S22-M 60/75MVA, 33/132kV, YNd11, ONAN/ONAF |
| 33kV MV Switchgear | 1 set | KYN61-40.5, 2000A, 31.5kA, 10 feeders + 2 incomers |
| 132kV GIS / AIS | 1 bay | Line bay with CB, CT, VT, disconnector, surge arrester |
| Reactive Compensation | 2 sets | ±20 MVAR STATCOM or switched capacitor banks |
| SCADA & Protection | 1 system | IEC 61850 Substation Automation, RTU, fault recorder |
| Station Service | 2 units | SCB13 200kVA, 33/0.4kV, dry-type, auxiliary transformer |
Q: What is the typical transformer size per MW of solar?
Standard sizing: 1.1–1.25 MVA of transformer capacity per MW of solar. For a 100MW plant, you typically need 40× 2.5MVA inverter transformers plus 2× 60MVA main step-up transformers.
Q: Do solar transformers need special harmonic rating?
Yes. Inverters produce harmonic currents that cause additional heating. We supply transformers with K-factor rating (typically K-4 to K-13), electrostatic shielding between HV and LV windings, and oversized neutral conductors for 3rd harmonic handling.
Q: What is the typical voltage configuration for a solar plant?
Most common: Inverter LV (400V–800V) → Step-up to 33kV → Collector network → Main transformer 33/132kV or 33/220kV for grid connection. Some markets use 11kV or 13.8kV as collection voltage for smaller plants.
Q: Can you provide containerized transformer + switchgear packages?
Yes, our YB Series solar skid is a complete containerized solution: transformer + MV switchgear + LV AC board + station service + SCADA panel — all pre-wired and factory-tested. Reduces on-site installation from weeks to days.
Q: What grid code compliance testing do you provide?
We support grid code compliance with pre-tested packages, factory acceptance tests (FAT) witnessed by owner's engineer, and on-site commissioning tests: FRT (fault ride-through), voltage/reactive power control, and power quality verification.
Q: Do you supply to solar EPCs directly?
Yes, we work directly with solar EPC contractors and developers. We offer competitive bulk pricing, consolidated shipments, and dedicated project management for large solar farm orders.
Power Your Solar Project with IEC-Certified Equipment
Tell us your solar plant capacity, grid voltage, and timeline — we'll provide a complete electrical BoS proposal with pricing, SLD, and delivery schedule.