Capacitor Solution for High-Reliability Photovoltaic (PV) Inverters
1. Solution Introduction
The reliability of a photovoltaic (PV) inverter is paramount, as it is expected to operate continuously for up to 25 years in harsh outdoor environments. Capacitors, particularly in the DC-Link and auxiliary power stages, are critical components that directly impact the inverter's lifespan and efficiency. This solution leverages the high-performance portfolio of Jianghai to address these challenges, ensuring maximum energy yield and long-term stability.
2. Solution Block Diagram
Fig. 1: Key capacitor locations in a typical string PV inverter architecture.
3. Core Advantages of this Solution
- Extended Lifespan: Utilizes film capacitors with self-healing properties for the critical DC-Link stage and 105°C long-life aluminum electrolytic capacitors for auxiliary power, matching the 25-year design life of solar panels.
- High Efficiency: Jianghai's DC-Link film capacitors feature extremely low ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance), minimizing power losses and improving the overall efficiency of the inverter.
- Thermal Performance: Selected components are designed to operate reliably at high ambient temperatures, a common condition for inverters installed outdoors.
- Optimized Cost-Performance: Provides a robust technical solution while maintaining cost-effectiveness, crucial for the competitive solar energy market.
4. Recommended Bill of Materials (BOM)
The following Jianghai components are recommended for a typical 5kW string inverter. Specific values will depend on the design's voltage and power rating.
| Function | Recommended Series | Key Benefits | Link |
|---|---|---|---|
| DC-Link Filtering | Jianghai CBB 131 / CBB 136 | High ripple current, low ESR, excellent self-healing | View CBB131 |
| Auxiliary Power Supply (Input) | Jianghai CD 297 | 105°C, miniaturized size, long life | View CD297 |
| Auxiliary Power Supply (Output) | Jianghai CD 295 | 105°C, 5000+ hours, high reliability | View CD295 |
| EMI Filtering (X/Y Capacitors) | Jianghai Film Safety Capacitors | Certified to safety standards (UL, VDE) | Contact Us |
Note: This is a generalized recommendation. Contact our FAEs with your specific design parameters for a customized BOM and samples.