String inverters are becoming the preferred choice for utility-scale solar projects because they offer higher energy generation, simplified maintenance, and greater system flexibility than traditional central inverters. As solar plants grow in size and complexity, these advantages can directly improve project performance and reduce operational risks.
In this guide, we’ll explain why utility-scale string inverters are gaining adoption and compare some of the leading options available in India.
What is String Inverters?
String inverters convert the DC electricity generated by PV modules (connected in series as “strings”) into AC electricity that can be used on the grid. While they were once limited to rooftop or small commercial installations, advances in capacity and design have made them a preferred solution for ground-mounted solar systems and PM-KUSUM deployments.
How Does a String Inverter Work?
A string inverter converts the direct current (DC) electricity generated by solar panels into alternating current (AC) electricity that can be used by electrical equipment or supplied to the grid.
In a solar system, multiple panels are connected in a series called a “string.” The DC power produced by each string is sent to the string inverter, which tracks the maximum power point (MPPT) of the connected panels and converts the DC power into grid-compatible AC power.
Modern string inverters often include multiple MPPTs, allowing them to optimize energy production from different panel groups independently. This helps improve system performance in conditions such as partial shading, uneven panel orientation, or varying terrain.
Key Features of String Inverters:
- Modularity: Each unit can manage several PV strings independently. This modularity enables developers to scale the plant as needed without requiring a complete redesign.
- High Efficiency: With conversion efficiencies reaching up to 99%, string inverters ensure minimal energy loss during DC to AC conversion.
- Ease of Maintenance: Faults are easier to isolate and replace in individual string inverters compared to large central systems, leading to reduced downtime and lower O&M costs.
- Scalability: Ideal for distributed applications like PM-KUSUM Component A, B, and C, where projects are decentralized and phased.
- Smart Monitoring: Most string inverters today support remote monitoring, predictive maintenance, and grid-support functions.
Top String Inverters in India
Here are the top string inverters currently dominating India’s utility and government-backed solar market:
| Brand | Model Name | Max Power (kW) | Notable Features |
|---|---|---|---|
| Hopewind | HSHV 385K | 385 | Industry’s highest capacity utility scale string inverter, 8 MPPTs, IP66 |
| Sungrow | SG320HX | 320 | 1500V input, 8 MPPTs, globally trusted, SCADA-compatible |
| WattPower | 330KTL-H1 | 330 | 1500V, 99% efficiency, intelligent diagnostics, 8 MPPTs |
1. Hopewind Inverter HSHV 385K
The Hopewind inverter is the most powerful utility scale string inverter available in India. The Hopewind 385kW inverter is engineered for large-scale projects that demand high energy throughput, lower BOS costs, and optimal performance in harsh Indian climates.
Key Highlights:
- 8 MPPTs and 32 inputs
- Supports 210mm modules (600Wp and beyond)
- IP66 protection for dust-prone and agricultural zones
- AFCI (Arc Fault Circuit Interruption) optional
- Operates up to 60°C without derating
Best Suited For: Large-scale ground-mounted and PM-KUSUM Component A projects across high-temperature zones.
2. Sungrow Inverter SG320HX
A widely deployed and trusted option in the Indian utility space, Sungrow’s SG320HX supports 1500V architecture, making it suitable for most new-age solar modules and plant designs.
Key Highlights:
- 8 MPPTs
- 1500V system voltage
- Integrated smart monitoring and string-level analytics
- Compliance with IEC and CEA grid codes
Best Suited For: Utility developers and EPCs looking for digital integration, excellent technical support, and global warranty coverage.
3. WattPower Inverter 330KTL-H1
The WattPower 330KTL-H1 is a robust, high-capacity string inverter designed for large-scale ground-mounted solar projects. It offers high efficiency, flexibility in design, and intelligent O&M features.
Key Highlights:
- 330kW output capacity
- 1500V DC input, supports next-gen high-power modules
- 8 MPPTs with high precision tracking
- Remote monitoring, string-level analytics, and smart fault detection
- IP66-rated for rugged outdoor applications
Best Suited For: EPCs and developers looking for a balance of high power output, advanced diagnostics, and field-tested reliability in Indian conditions.
Market Insights for EPCs & Developers
- DC Input Voltage: Modern string inverters now support 1100V or 1500V DC inputs, ensuring compatibility with next-gen PV modules and large arrays.
- String Capacity: Models like Hopewind and WattPower can handle up to 32 strings per inverter, allowing denser installations.
- O&M Optimization: String-level diagnostics reduce mean time to repair (MTTR), an essential feature in remote or rural locations such as PM-KUSUM sites.
Grid Compliance: These inverters meet Indian grid code requirements, including LVRT, HVRT, and reactive power support, key for grid-connected utility-scale projects.
Conclusion
String inverters have become the backbone of India’s ground-mounted and distributed solar growth. Thanks to their flexibility, efficiency, and ease of maintenance, they are rapidly replacing traditional central inverters even in large-scale projects.
If you’re planning a utility-scale solar plant or implementing a PM-KUSUM project, the top string inverters in the Indian market include:
- Hopewind Inverter – for high-capacity, rugged installations in high-temperature zones
- Sungrow SG320HX – for balanced performance, digital support, and global reliability
- WattPower 330KTL-H1 – for efficient, intelligent, and future-ready solar plants
By choosing the right string inverter based on capacity, MPPT count, temperature performance, and digital features, EPCs and developers can ensure long-term reliability and maximum ROI in India’s fast-evolving solar sector.
Where Can You Buy Hopewind Inverter?
Ornate Solar is one of the leading solar companies in India with over 10 years of experience in the industry. We are the official partner of Hopewind in India. You can connect with us to get the best prices on the Hopewind inverter.
Ornate Solar has also developed India’s first Solar roof system. Ornate InRoof is a roof made out of solar panels, which is leak-proof and looks aesthetically pleasing.
Ornate Solar is also a trusted BESS manufacturer in India. We have developed UnityESS, an advanced energy storage solution to provide reliable power and energy independence.
If you are exploring solar solutions, reach out to us at 1800 2026 252 to discuss your options.
This is a helpful overview of the top string inverters for utility-scale solar projects in India.