Comparison Between Sungrow SG350HX-V134 and SG350HX-20 Inverters: Which Version Should You Choose for Your Solar Plant?
Sungrow‘s grid-tied inverters are among the most widely used options in large-scale projects due to their reliability, efficiency, and compatibility with next-generation modules. In this guide, we take a deep dive into the technical differences between the SG350HX-v134 and SG350HX-20, two models designed for utility-scale solar plants with advanced features.
If you’re considering which Sungrow inverter is best for your PV installation, this article will give you the key insights to make an informed decision.
1. MPPT and String Inputs: Optimized Architecture Based on Your Needs
One of the most relevant technical aspects between these models is the MPPT architecture and input current capacity.
SG350HX-V134
- 12 or 16 MPPTs
- 24 or 32 DC inputs (2 per MPPT)
- Max input current: 30 A (16 MPPT) / 40 A (12 MPPT)
SG350HX-20
- 6 MPPTs
- 30 DC inputs (5 strings per MPPT)
- Max input current: 75 A
2. DC Protection: Smarter Features in the SG350HX-20
In terms of DC protection, the SG350HX features a fuse-free design, while the SG350HX-20 includes:
- Smart DC switch
- Active DC protection
- 24/7 insulation monitoring (also available on the SG350HX with EMU200)
These features enhance operational safety and reduce diagnostic times in case of faults.
3. Thermal Management and Smart Maintenance
The SG350HX-20 stands out for including an AI-based air duct management system, which is not present in the previous SG350HX version.
This system improves thermal performance and extends the inverter’s lifespan, especially in environments with extreme temperatures or dust accumulation.
4. AC Connection Terminals: Greater Design Flexibility
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SG350HX-V134: Single or dual AC terminal
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SG350HX-20: Dual AC terminal by default, also configurable in single mode
This feature simplifies system design, especially in plants with specific power evacuation needs.
5. Grid Response and Grid-Forming Compatibility
Both inverters are equipped to handle grid events such as UHV, LVRT, and HVRT, with a response time of 30 ms.
However, the SG350HX-20 offers an improvement:
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Minimum SCR (Short Circuit Ratio) of 1.1 with automatic adjustment to grid behavior, compared to the 1.15 SCR of the previous model.
This enhances stability and compatibility in more demanding or unstable grid environments.
Technical Summary of Key Differences
Which Sungrow Inverter Is Best for Your Project?
The choice between the SG350HX-v134 and SG350HX-20 depends on your photovoltaic modules and system design:
🔹 If you’re using high-power bifacial panels, such as TOPCon modules with >20 A per string, the SG350HX-20 is the best choice thanks to its high input capacity (75 A) and advanced protection features.
🔹 If your design requires more independent MPPTs or you’re working with lower-current modules, the SG350HX-v134 remains a solid, reliable, and widely used option
At Vico Export Solar Energy, we are official distributors of Sungrow.
Are you working on a project and need expert guidance? Contact us and discover how we can help you get the most out of your solar system. We’re here to support you every step of the way.
