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String Grid-tie Inverters
2 Product Series · 18 Models available
String grid-tie inverters turn the DC output of PV modules into grid-synchronised AC. QDTB string inverters cover 3 kW to 110 kW in single- and three-phase frames, each with multiple independent MPPT trackers so differently oriented or partially shaded strings do not drag each other down. A wide DC input window, 1500 V maximum voltage support and peak efficiencies above 98 % keep energy yield high, while IP65/IP66 enclosures allow outdoor wall mounting beside the array. Built-in communication and monitoring ports make fleet-level operation straightforward for residential and commercial installations.
Specifications Range
All specifications and dimensions can be customized upon request
| Key parameters | Model Range |
|---|---|
| Rated Power | 3–250 kW |
| Max DC Voltage | 1100 V, 1500 V |
| MPPT Trackers | 2–12 |
| AC Voltage | 220 V, 380 V |
| Frequency (Hz) | 50 Hz |
| Max Efficiency | 97.5–99 % |
| Protection Level | IP65, IP66 |
Available Series
SI-1000
→SI-1000 Series — 1500 V Three-Phase String Inverters
The SI-1000 platform covers 3–36 kW three-phase inverters on a 1500 V DC architecture, reducing string count and cable losses for residential and small commercial arrays.
SI-1500
→SI-1500 Series — High-Power Commercial String Inverters
The SI-1500 platform scales to 110 kW for commercial and utility string applications, packing many MPPT channels and full grid-code compliance into a compact, serviceable cabinet.
Application Scenarios
Residential Grid-Tie
3–10 kW single-phase inverters sized to a household array, with smart monitoring for self-consumption.
Commercial Rooftops
20–110 kW three-phase units that aggregate multiple strings across large warehouse and factory roofs.
Partial-Shade Arrays
Multiple MPPT channels isolate shaded or east/west strings so each operates at its own maximum power point.
High-Voltage Systems
1500 V DC input designs that reduce string count, cable cross-section and DC losses for large plants.
Retrofit & Expansion
Scalable string architecture lets new strings be added incrementally without replacing existing inverters.
Harsh Outdoor Sites
Fanless or forced-cooled IP65/IP66 enclosures withstand rain, dust and coastal salt spray.
Technical Advantages
Multi-MPPT Design
Two to twelve independent trackers per unit maximise yield across mismatched orientations and shading.
98 %+ Peak Efficiency
High-frequency topologies and low-loss magnetics hold conversion loss below 2 %.
Wide DC Input Window
Broad MPPT voltage ranges accept short and long strings, simplifying system design.
Built-In Monitoring
WiFi, 4G and RS485 connectivity stream performance and fault data to local and cloud platforms.
Frequently Asked Questions
What is the difference between string and central inverters?
String inverters connect one or a few module strings per unit and offer granular MPPT and easy maintenance; central inverters aggregate hundreds of strings into one large unit for utility plants.
How many MPPT trackers do I need?
One tracker per orientation or shading group is ideal — east/west, pitched/veranda and partially shaded zones should each have their own MPPT.
Can I oversize the array relative to the inverter?
Yes, a DC-to-AC ratio around 1.1–1.3 is common and lets the inverter clip only briefly at peak while recovering energy in low light.
What protection class is suitable for outdoor mounting?
IP65 or IP66 enclosures are recommended for wall mounting outdoors; indoor units may use IP20.
Do your inverters support remote monitoring?
Yes, standard RS485 plus optional WiFi/4G modules feed real-time generation, voltage and fault data to a monitoring platform.
Instant Selection & Quote Calculator
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| Base price (interpolation) | $390 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Complete equipment — no winding copper linkage
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All specifications and dimensions can be customized upon request