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SI-1500 Series — High-Power Commercial String Inverters
9 Models available · String Grid-tie 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.
Model Number Breakdown
- Up to 110 kW output
- Up to 12 MPPT channels
- Anti-PID and surge protection
- Remote firmware update
Specifications Range
All specifications and dimensions can be customized upon request
| Key parameters | Model Range |
|---|---|
| Rated Power | 50–250 kW |
| Max DC Voltage | 1500 V |
| MPPT Trackers | 4–12 |
| AC Voltage | 380 V |
| Frequency (Hz) | 50 Hz |
| Max Efficiency | 98.7–99 % |
| Protection Level | IP66 |
⚙How It Works
The SI-1500 platform scales string topology to commercial and utility power levels — up to 110 kW per unit — while keeping the granular MPPT advantage of string architecture. Many independent MPPT channels isolate mismatched strings across a large roof, and the high-frequency transformerless bridge holds conversion loss below 2 %. Built-in anti-PID, AFCI and Type 2 surge protection keep large installations safe and compliant.
▦Structure & Composition
The SI-1500 uses a modular power-stage design: multiple DC input boards feed parallel MPPT boost stages into a common DC link, followed by a high-power three-level inverter bridge and an output filter. A serviceable cabinet layout with front access simplifies maintenance, and dual communication ports (RS485 + Ethernet/WiFi) support fleet monitoring and remote firmware updates.
Model Range
| Model | Rated Power | Max DC Voltage | MPPT Trackers | Max Efficiency | AC Voltage | Reference Price |
|---|---|---|---|---|---|---|
| QD-SI-50 | 50 kW | 1500 V | 4 | 98.7 % | 380 V | … |
| QD-SI-60 | 60 kW | 1500 V | 4 | 98.7 % | 380 V | … |
| QD-SI-80 | 80 kW | 1500 V | 6 | 98.7 % | 380 V | … |
| QD-SI-100 | 100 kW | 1500 V | 6 | 99.0 % | 380 V | … |
| QD-SI-110 | 110 kW | 1500 V | 6 | 99.0 % | 380 V | … |
| QD-SI-125 | 125 kW | 1500 V | 8 | 99.0 % | 380 V | … |
| QD-SI-150 | 150 kW | 1500 V | 8 | 99.0 % | 380 V | … |
| QD-SI-200 | 200 kW | 1500 V | 10 | 99.0 % | 380 V | … |
| QD-SI-250 | 250 kW | 1500 V | 12 | 99.0 % | 380 V | … |
Applications
Selection Guide
- Commercial rooftops and ground plants of 20–110 kW per unit, scalable by adding inverters per zone.
- Use the high MPPT count to segregate large strings by orientation and shading without combiner losses.
- Verify grid-code compliance (voltage, frequency, anti-islanding) for the target utility before finalising the model.
Frequently Asked Questions
How many strings can one SI-1500 handle?
Up to 12 MPPT channels aggregate many strings, so a single 110 kW unit can serve a large, mixed-orientation rooftop.
Is a transformer needed for grid connection?
No — the transformerless bridge meets grid codes directly, with anti-PID and surge protection built in.
How is maintenance handled?
Front-access serviceable cabinets and remote firmware updates minimise downtime across large fleets.
Instant Selection & Quote Calculator
Select your specifications to get an estimated price instantly.
| 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
Reference prices are for estimation only and do not constitute a formal offer.
We will reply with your latest quote instantly.
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