With the rapid growth of the global photovoltaic (PV) industry, ground-mounted PV power plants are expanding in scale, requiring increasingly stringent cable performance. RHW-2 cables have become an ideal choice for PV wiring due to their excellent heat resistance, moisture resistance, and mechanical properties. This article focuses on the practical applications of RHW-2 cables in ground-mounted PV power plants. It also compares RHW-2 with other commonly used cables, such as THW/RHH, XHHW-2, RHW, and UL 4703, to highlight its advantages in various installation scenarios, helping engineers, designers, and project managers understand its technical value in PV projects.
Overview of RHW-2 Cable
RHW-2 cables are suitable for high-temperature, humid, and outdoor installation environments. The main structure includes:
- Conductor: High-quality oxygen-free copper ensures excellent electrical conductivity and efficient power transmission.
- Insulation: Made of thermoplastic PVC, with a heat rating of 90℃, ensuring stable operation in high-temperature conditions.
- Jacket: Excellent UV and moisture resistance, suitable for outdoor, underground, and humid environments.
Applications include:
- PV module string wiring
- Connections from combiner boxes to inverters
- Internal power distribution and control circuits within power plants
Comparison with Other Common Cables
To better illustrate RHW-2's advantages in PV systems, we compare it with THW/RHH cables:
| Feature | RHW-2 | THW/RHH |
|---|---|---|
| Heat Rating | 90℃ | 75℃/90℃ |
| Moisture Resistance | Excellent, long-term outdoor | Good, may age in prolonged humidity |
| UV Resistance | Excellent, suitable for outdoor | Moderate, long-term exposure requires protection |
| Flexibility | Good, easy to install | Stiff, harder to handle |
| Installation Environment | Ground-mounted PV, combiner boxes, distribution circuits | Industrial wiring, indoor or conduit installation |
| UL Certification | Yes | Some models |
| Safety | Flame retardant, moisture and UV resistant | Flame retardant, moisture resistant, weaker UV resistance |
Technical Insight:
- RHW-2 clearly outperforms THW/RHH in heat and moisture resistance, which is crucial for ground-mounted PV plants. The cables are exposed to direct sunlight, with temperatures exceeding 70℃, and ground-mounted areas are often exposed to rain and dew. RHW-2's comprehensive performance ensures long-term reliability.
RHW-2 Cable Applications in Ground-Mounted PV Plants
PV Module String Wiring
For each PV module in ground-mounted arrays:
- RHW-2's flexibility and weather resistance simplify cable routing and reduce transmission losses.
- High-temperature tolerance ensures stable operation year-round.
- UV resistance reduces replacement frequency.
Combiner Box to Inverter Connections
Cables connecting combiner boxes to inverters often traverse outdoor environments:
- RHW-2 resists moisture and UV exposure.
- Multi-core cables transmit DC power efficiently, reducing wiring complexity.
- Easy installation with mounting on trays or racks.
Internal Power Distribution and Control Circuits
Cables for internal plant control, lighting, monitoring, and automation:
- RHW-2 ensures stable electrical performance.
- Long-term operation without insulation aging or short circuits.
- Multiple sizes available for various current loads.
Direct Burial and Outdoor Installation
For large-scale cable deployment:
- RHW-2 supports direct burial.
- No additional protective conduits needed in high-humidity areas.
- Long service life reduces maintenance costs.
RHW-2 Cable Specifications and Selection
| Model | Conductor Size (mm²) | Max Operating Voltage (V) | Application |
|---|---|---|---|
| RHW-2 4mm² | 4 | 600 | PV module string wiring |
| RHW-2 6mm² | 6 | 600 | Combiner box to inverter DC connection |
| RHW-2 10mm² | 10 | 600 | Main distribution lines, branch power supply |
| RHW-2 16mm² | 16 | 600 | High-load combiner and centralized inverter lines |
Selection Advice:
- Small PV systems: 4~6mm² for flexible wiring
- Medium to large plants: 10~16mm² to reduce voltage drop and improve efficiency
Performance Advantages of RHW-2 Cable
1.Long-term Heat and Moisture Resistance
- Stable operation at 90℃
- Water, moisture, and mold resistant
2.Safety and Reliability
- Flame retardant
- UL certification ensures safe usage
3.Easy Installation
- Flexible, small bending radius
- Can be installed in trays, racks, or on the ground
4.Low Maintenance Costs
- Weather and UV resistant
- Long service life reduces inspection and replacement frequency
Marketing Highlights of RHW-2
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Professional UL Cable Manufacturing
We specialize in UL-certified cables, including THHN, THW, MC cable, AC cable, and more, to meet diverse project requirements. Detailed product information is available in our UL wire series.
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Compliant with Americas Market Standards
All RHW-2 cables meet North and South American standards, suitable for various PV engineering projects.
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Complete Specifications and Full Coverage
From small module wiring to large distribution lines, RHW-2 offers multiple conductor sizes for different current and voltage requirements.
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Strong Delivery Capability for Any Order Size
We provide fast delivery for both small and large-scale projects, ensuring on-time commissioning.
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Professional Technical Support
Comprehensive technical support is available, including cable selection, routing solutions, installation guidance, and maintenance advice.
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Extensive International Cooperation
Years of export experience with partners worldwide, covering projects in the Americas, Asia-Pacific, and Europe.
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UL Certification Ensures Reliability
Each batch of RHW-2 cables is UL-certified to meet international safety standards.
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Customizable Colors and Options
We provide customization for materials, sizes, lengths, colors, performance, labeling, and packaging to meet diverse engineering needs.
Application Case Studies
1.50MW Ground-Mounted PV Plant in California, USA
- RHW-2 used for module string wiring and combiner box connections
- Stable performance under high-temperature sunlight exposure
2.PV Plant in Northeast Brazil
- High heat and humidity
- Direct burial of RHW-2 cables without extra protective measures
- Reduced long-term maintenance costs
3.Large PV Plant in Mexico – Combiner Lines
- 10~16mm² RHW-2 used to connect centralized inverters
- Ensured efficient power transmission and safe operation
RHW-2 Provides Superior Performance for PV Projects
RHW-2 cables offer excellent heat resistance, moisture resistance, flame retardancy, and long-term reliability, making them ideal for ground-mounted PV power plant wiring. With multiple sizes, rich customization options, and professional technical support, RHW-2 cables are widely applied in PV projects worldwide.
Company Information
Dongguan Greater Wire & Cable Co., Ltd.
- Tel/WhatsApp/WeChat: +86 135 1078 4550 / +86 136 6257 9592
- Email: manager01@greaterwire.com