Solar PV & Energy Storage Solutions
Reliable Switching for Clean Energy
Solar photovoltaic systems and energy storage require robust switching solutions that can handle high DC currents, provide safety isolation, and maintain reliable operation over decades of service life.
HONGFA relays provide the performance, safety, and longevity needed for solar inverters, battery systems, and grid-tie applications in the rapidly growing renewable energy sector.
Solar Energy Market Growth
20%
Annual Growth
Global solar market CAGR through 2030
1,000GW
Installed Capacity
Global solar PV target by 2030
$1.8T
Investment
Required for renewable transition
50%
Cost Reduction
Solar LCOE decrease since 2020
Solar & Energy Storage Applications
String Inverters
DC switching and isolation relays for residential and commercial string inverters.
- 1000VDC switching capability
- Arc suppression technology
- UL 1741 compliant
- 20-year service life
Recommended: HONGFA HVDC series
Energy Storage Systems
Battery management and protection relays for grid-scale and residential ESS.
- High current DC switching
- Emergency disconnect function
- Fire safety integration
- Remote monitoring capability
Recommended: HF18FF industrial series
Grid-Tie Systems
Utility interconnect and protection relays for grid-connected solar installations.
- IEEE 1547 compliance
- Anti-islanding protection
- Utility grade reliability
- Remote disconnect capability
Recommended: HFE18 latching series
Central Inverters
High-power switching solutions for utility-scale solar power plants and farms.
- MW-scale power handling
- Parallel operation capability
- Maintenance disconnect
- Weather-resistant design
Recommended: Custom high-power series
Residential Solar
Compact, cost-effective relays for rooftop solar and home energy systems.
- Compact form factor
- Easy installation
- Code compliance
- Long-term reliability
Recommended: HF115F power series
Monitoring & Control
Signal and control relays for performance monitoring and system optimization.
- Low-level signal switching
- Data acquisition support
- Communication interface
- Environmental monitoring
Recommended: HFD3 signal series
Solar System Relay Challenges
DC Arc Suppression
Unlike AC systems, DC arcs don't naturally extinguish at zero-crossing points, making DC switching more challenging. Solar relays must incorporate advanced arc suppression technologies.
High Voltage Operation
Modern solar systems operate at up to 1000VDC, requiring specialized relay designs with enhanced dielectric strength and creepage distances.
Environmental Exposure
Outdoor installations subject relays to UV radiation, temperature cycling, humidity, and contamination. Relay selection must account for 20-25 year service life requirements.
Safety & Code Compliance
Solar installations must meet stringent electrical codes including NEC Article 690, UL 1741, and IEEE 1547 standards for grid interconnection.
Rapid Shutdown Requirements
NEC 690.12 requires rapid shutdown capability for rooftop installations, demanding relays that can quickly isolate DC circuits during emergencies.
Maintenance Access
Service disconnect switches must provide visible isolation for maintenance work, often requiring manual operation capability alongside remote control.
HONGFA Solar Relay Solutions
High-Voltage DC Switching
Key Features:
- 1000VDC switching capability
- Advanced arc chamber design
- Silver alloy contacts optimized for DC
- High dielectric strength (>5kV)
- Rapid switching response (<10ms)
- Parallel operation capability
Performance Benefits:
- Reliable arc extinction
- Minimal contact erosion
- Low contact resistance
- Extended electrical life
- Reduced maintenance requirements
- Enhanced safety operation
Environmental Protection
- UV Resistance: Housing materials tested to ASTM G154 standards
- Temperature Cycling: -40°C to +85°C operation with cycling endurance
- Moisture Protection: IP65/IP67 sealing for outdoor installations
- Chemical Resistance: Compatible with cleaning agents and environmental contaminants
Solar Application Relay Specifications
| Application | Voltage Rating | Current Rating | Key Requirements |
|---|---|---|---|
| String Inverter DC Input | 1000VDC | 15-30A | Arc suppression, UL 1741 |
| Battery ESS Disconnect | 600VDC | 100-300A | Emergency disconnect, fire safety |
| AC Grid Disconnect | 480VAC | 50-100A | IEEE 1547, anti-islanding |
| Combiner Box | 1000VDC | 10-20A | String isolation, monitoring |
| Rapid Shutdown | 80VDC | 5-15A | Fast response, NEC 690.12 |
Customer Success Story
Major Solar Inverter Manufacturer
"We've been using HONGFA's high-voltage DC relays in our string inverters for over 5 years. Their consistent performance and reliability have been crucial to our product success. The technical support from LiTong helped us optimize our designs for both performance and cost, enabling us to maintain our market leadership position."
Results achieved:
- 99.7% field reliability over 5-year deployment
- 15% reduction in warranty claims vs. previous relay supplier
- Successful UL 1741 certification for all product lines
- On-time delivery performance >98% for high-volume orders
— Chief Technology Officer, Leading Solar Inverter Company
Solar Development Support
Code Compliance
Expert guidance on NEC, UL, and IEEE standards for solar installations and grid-tie systems.
Access Resources →Arc Testing
DC arc suppression testing and validation services for high-voltage solar applications.
Request Testing →Custom Solutions
Specialized relay configurations for unique solar and energy storage requirements.
Discuss Custom Needs →Power the Future with Reliable Solar Solutions
Our solar relay experts can help you design safer, more reliable renewable energy systems.
Start Your Solar Project