Solar Inverter Solution

Application

Description

High-efficiency power stage solution for solar PV inverters using Slkor IGBTs and SiC devices

Core Advantages

Ultra-High Efficiency SiC diode integration and optimized IGBT selection deliver peak efficiency above 98.5%, maximizing energy harvest and ROI
Wide MPPT Range 200V to 850V MPPT voltage range accommodates various panel configurations and shading conditions
Rugged Design IP65 protection and -25°C to +60°C operating range ensure reliable operation in harsh outdoor environments
Grid Compliant Meets IEEE 1547 and IEC 61727 standards with THD <3% and power factor >0.99

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 SL40T120FL 1200V 40A IGBT for H-bridge 4 📄 Download
2 SLC06S065 650V SiC Schottky diode 2 📄 Download
3 SL20N65 650V MOSFET for boost switch 1 📄 Download

Applications

Residential rooftop solar systems
Commercial solar installations
Solar pumping systems
Battery energy storage inverters
Microgrid applications
Solar-diesel hybrid systems

Technical Specifications

D C Input Voltage
200V - 850V MPPT range
A C Output Voltage
230V/400V AC ±10%
Output Power
3kW - 50kW
Peak Efficiency
> 98.5%
European Efficiency
> 97.5%
T H D
< 3% at rated power
Power Factor
> 0.99
Protection Class
IP65
Operating Temperature
-25°C to +60°C

Customer Success Stories

SunPower Installations

Solar Energy | Residential Solar Inverter

Challenge

A solar installer needed cost-effective inverters for residential rooftop systems. The inverters needed 98%+ efficiency to maximize energy harvest, wide MPPT range for varying panel configurations, and competitive pricing to win utility-scale residential projects.

Solution

Developed a 5kW single-phase inverter using SL40T120FL IGBTs for the H-bridge and SLC06S065 SiC diodes for the boost stage. The design included dual MPPT inputs, WiFi monitoring, and compact IP65 enclosure for outdoor installation.

Results

  • Peak efficiency of 98.3% achieved
  • European efficiency of 97.8%
  • Cost reduction of 25% compared to imported inverters
  • MTBF > 100,000 hours demonstrated in field
  • Over 2,000 units installed with <0.5% failure rate

AgriSolar Solutions

Agriculture | Solar Water Pumping System

Challenge

An agricultural equipment provider needed solar-powered water pumps for remote irrigation. The system needed to operate with variable solar input, provide soft-start for pumps, and withstand harsh outdoor environments with temperatures up to 50°C.

Solution

Designed a specialized solar pump inverter using SL20T65F IGBTs with derating for high ambient temperatures. The system included maximum power point tracking optimized for pump loads, soft-start to prevent water hammer, and IP65 rating with conformal coating.

Results

  • Successfully operates with solar input from 30% to 100%
  • Water delivery increased by 40% compared to diesel pumps
  • Zero fuel costs and minimal maintenance required
  • Operating temperatures up to 55°C ambient verified
  • Deployed in 500+ agricultural sites across rural regions

FAE Expert Insights

S

Senior FAE

Applications Engineer

10+ years

Professional Insights

[Data Pending] FAE insights to be added based on actual application experience with this solution.

Key Takeaways

  • Use SiC diodes in the boost stage to eliminate reverse recovery losses
  • Select 1200V IGBTs for 1000V DC solar systems with safety margin
  • Optimize switching frequency for balance of efficiency and filter size
  • Design for full power operation at 50°C ambient minimum
  • Implement comprehensive grid protection and anti-islanding

Decision Framework

Decision Framework
Steps:
  1. Evaluate requirements
  2. Compare solutions
  3. Consult FAE

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

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Frequently Asked Questions

Why use SiC diodes instead of silicon diodes in the boost stage?

SiC Schottky diodes provide three key advantages over silicon diodes in solar boost converters: First, SiC diodes have zero reverse recovery charge, eliminating reverse recovery losses that can be 1-2% of total power in silicon diodes. Second, SiC diodes can operate at higher temperatures (175°C vs 150°C) with lower leakage, improving reliability in hot outdoor environments. Third, SiC diodes enable higher switching frequencies (50-100kHz vs 20-30kHz), reducing boost inductor size and cost. The efficiency improvement of 0.5-1% directly translates to higher energy harvest over the system lifetime, justifying the higher diode cost.

For maximum efficiency and reliability, always use SiC diodes in solar boost stages. Contact our FAE team for SiC device selection and cost-benefit analysis.

What switching frequency is optimal for solar inverters?

The optimal switching frequency for solar inverters involves trade-offs between efficiency, filter size, and EMI. For residential single-phase inverters (3-10kW), 16-20kHz is typical - high enough to keep magnetics small and avoid audible noise, but not so high that switching losses dominate. For commercial three-phase inverters (10-50kW), 8-12kHz is common due to higher power and IGBT limitations. Higher frequencies (>30kHz) using SiC or GaN devices enable very small filters but require careful thermal design. The European efficiency standard (weighted average across load points) is the key metric - optimize frequency to maximize this rather than peak efficiency alone.

Start with 16kHz for single-phase and 10kHz for three-phase designs. Our FAE team can provide efficiency analysis across switching frequencies for your specific power level.