Copper Flexible Connections for Solar Energy Systems
High-conductivity copper braided and laminated flexible connectors for PV inverters, DC combiner boxes, and utility-scale solar installations.
Why Solar Systems Demand Reliable Flexible Connections
Solar PV systems operate across extreme temperature cycles — from sub-zero nights to 70 °C+ module temperatures. Rigid connections crack under thermal expansion; flexible copper connectors absorb this stress while maintaining ultra-low contact resistance. Yulian manufactures copper flexible connectors specifically engineered for the high-current DC environment of modern solar installations, using 99.99% C11000 electrolytic copper with tinned or silver-plated terminals for long-term outdoor corrosion resistance.
Product Types for Solar Applications
Laminated Copper Busbars
- Stacked 0.1–0.3 mm copper foils, press-welded ends
- Low inductance — critical for inverter DC bus
- Current capacity: 100 A – 5000 A
- Insulation: PVC sleeve, heat-shrink, silicone
- Ideal for: string inverter DC bus, combiner box outputs
Braided Copper Flexible Connectors
- Multi-layer tinned copper braid, excellent vibration absorption
- Lugs: crimped, welded or bolted flat terminals
- Cross-section: 16 mm² – 400 mm²
- Voltage: up to 1500 V DC
- Ideal for: transformer-to-inverter links, array grounding
Solar Application Areas
- String Inverter DC Bus: Laminated copper shunts connecting PV string inputs — low ESL, high ripple current tolerance.
- Combiner Box to Central Inverter: High-current braided connectors, 1000 V DC, 200–2000 A, IP65-rated outdoor installations.
- Transformer LV Terminals: Flexible braids connecting inverter output to step-up transformer, absorbing thermal displacement.
- Array Grounding & Bonding: Tinned copper grounding straps meeting NEC 690 and IEC 62548 requirements.
- BESS Integration: Flexible busbars between battery modules and inverter in solar+storage hybrid systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Conductor material | C11000 / C10200 electrolytic copper, 99.97%+ purity |
| Surface finish | Bare, Sn-plated (5–20 μm), Ag-plated (5–15 μm) |
| Current range | 50 A – 5000 A continuous |
| Voltage rating | Up to 1500 V DC |
| Temperature range | -40 °C to +150 °C |
| Flexibility standard | IEC 60228 Class 5 / Class 6 |
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