APsystems QT2 Specifications & Review
The APsystems QT2 is a four-input microinverter that handles four solar panels simultaneously with independent MPPT per channel, delivering the lowest per-panel hardware cost in the microinverter category.
What Makes the APsystems QT2 Different
The APsystems QT2 Quad Microinverter is a 4-input microinverter delivering 1440W total AC output across 4 independent MPPT channels — each handling 360W per panel. APsystems pioneered the multi-input microinverter concept, and the QT2 takes this further with four panels per unit, delivering the lowest per-panel microinverter cost in the market. The IP67-rated enclosure, 25-year warranty, and 96.8% peak efficiency make it competitive with Enphase at a lower per-panel cost.
Key Specifications
| Brand | APsystems |
| Model | APsystems QT2 Quad Microinverter |
| Type | Microinverter |
| Max AC Power | 1440W |
| Max DC Power | 1920W |
| Peak Efficiency | 96.8% |
| CEC Efficiency | 96.3% |
| DC Voltage Range | 16-55V |
| Max Input Voltage | 60V DC |
| Max Input Current | 32A |
| Output Voltage | 240V |
| MPPT Trackers | 4 |
| Monitoring | APsystems EMA App (WiFi) |
| Communication | Zigbee / WiFi via ECU |
| Dimensions | 298 x 220 x 38 mm |
| Weight | 3.1 kg |
| IP Rating | IP67 |
| Operating Temperature | -40C to +65C |
| Warranty | 25 years |
| Certifications | UL 1741, IEEE 1547, FCC Part 15 |
Pros & Cons
Pros
- ✓ Four-in-one design delivers the lowest per-panel microinverter cost on the market
- ✓ Four independent MPPT trackers ensure optimal performance even with mismatched panels
- ✓ Single AC output connection for four panels dramatically simplifies wiring and reduces installation time
Cons
- ✗ A single unit failure takes four panels offline simultaneously
- ✗ Larger physical footprint may not fit under all panel frame mounting configurations
- ✗ ECU gateway required for monitoring adds to system component count
Best For
Large residential and small commercial arrays that want microinverter-level optimization at the lowest possible per-panel inverter cost
Is the APsystems QT2 Worth It?
The APsystems QT2 delivers 1.4 kW of AC output with a peak efficiency of 96.8% and a CEC weighted efficiency of 96.3%. This places it in line with the average for microinverters (approximately 97%). While not the highest-efficiency option in its class, the difference of a fraction of a percent typically amounts to only a small reduction in annual energy yield for most residential systems.
The QT2 includes a industry-leading 25-year warranty. The industry standard for microinverters is 25 years, so this warranty meets the industry benchmark, offering reliable coverage for the expected life of the equipment.
As a microinverter, the QT2 provides panel-level power optimization and monitoring. Each panel operates independently, so shading or debris on one panel does not drag down the output of others. Microinverters also inherently comply with NEC rapid shutdown requirements, simplifying installation and improving rooftop safety for firefighters and maintenance crews.
Overall, the APsystems QT2 can be a reasonable choice depending on your priorities and budget. Weigh its 96.8% efficiency and 25-year warranty against competing models to determine if it delivers the best value for your specific installation needs.
Real-World Performance
The QT2 achieves 96.3% CEC efficiency in field operation. Each of the 4 MPPT channels operates independently, so shading on one panel does not affect the others connected to the same unit. The -40C to +65C operating range with IP67 protection ensures reliable outdoor performance in all climates. APsystems' EMA monitoring app provides production data per channel, though it requires an ECU gateway for communication. Field reliability data shows microinverter failure rates comparable to Enphase at approximately 0.05-0.1% per year.
Who Should Buy the APsystems QT2?
System Design Tips
Pair the QT2 with panels rated 1224-1824W for optimal DC/AC ratio. The 32A maximum input current across 4 channels accommodates most residential panels. An APsystems ECU gateway is required for monitoring (except EZ1-M which uses Bluetooth). The IP67 enclosure mounts directly behind each panel for weather-resistant outdoor installation.
Price Estimate
The APsystems QT2 Quad Microinverter typically costs $360-$576 per unit (covering 4 panels), putting the per-panel inverter cost at approximately $90-$144. For a 10 kW residential system using 25 panels, total microinverter cost runs approximately $3024-$4032. Total installed system cost is typically $2.80-$3.80/W for microinverter-based residential systems before the 30% ITC.
How the APsystems QT2 Compares
| Model | AC Power | Efficiency | MPPT | Warranty |
|---|---|---|---|---|
| APsystems QT2 (this inverter) | 1.4 kW | 96.8% | 4 | 25 yrs |
| Hoymiles HMS-1600-4T | 1.6 kW | 96.7% | 4 | 25 yrs |
| Hoymiles HMS-2000-4T | 2.0 kW | 96.7% | 4 | 25 yrs |
| Hoymiles HM-800 | 800W | 96.5% | 2 | 25 yrs |
Compare This Inverter
Installation & Compatibility
DC Input Specifications
- DC Voltage Range
- 16-55V
- Max Input Voltage
- 60V DC
- Max Input Current
- 32A
- MPPT Trackers
- 4
- Max DC Input
- 1.9 kW
Microinverters pair with individual panels. Match the panel wattage to the maximum DC input rating for optimal performance.
System Sizing & Environment
- Max AC Output
- 1.4 kW
- Max DC Input
- 1.9 kW
- Output Voltage
- 240V
- IP Rating
- IP67
- Operating Temperature
- -40C to +65C
- Dimensions
- 298 x 220 x 38 mm
- Weight
- 3.1 kg (6.8 lbs)
Monitoring & Communication
- - Monitoring: APsystems EMA App (WiFi)
- - Communication: Zigbee / WiFi via ECU
- - Certifications: UL 1741, IEEE 1547, FCC Part 15
Frequently Asked Questions
What solar panels are compatible with the APsystems QT2 Quad Microinverter?
The QT2 works with panels that have Vmp in the 16-55V range and Imp up to 32A per channel. This covers most residential panels from 300W to 480W. For optimal performance, match panels rated at 360-456W per input for a DC/AC ratio of 1.0-1.3.
What is the warranty on the APsystems QT2 Quad Microinverter?
APsystems provides a 25-year standard warranty on the QT2. This is the longest warranty available in the inverter market, matching the expected lifespan of the solar panels themselves.
Can the APsystems QT2 Quad Microinverter work with battery storage?
Microinverters are AC-coupled, so battery storage must be added as an AC-coupled system (like Enphase IQ Battery, Tesla Powerwall, or Franklin WH aPower). The battery connects to the AC side of the electrical panel, not directly to the microinverters.
What type of inverter is the APsystems QT2?
The APsystems QT2 is a microinverter rated at 1.4 kW AC output. Microinverters are installed on each individual panel, offering panel-level optimization and monitoring.
What is the CEC efficiency of the APsystems QT2?
The CEC weighted efficiency is 96.3%, with a peak efficiency of 96.8%. CEC efficiency is a more realistic measure of real-world performance than peak efficiency, as it accounts for varying power levels throughout the day.
How long is the warranty on the APsystems QT2?
The APsystems QT2 comes with a 25-year manufacturer warranty. This is one of the longest inverter warranties available, matching the lifespan of most solar panel warranties.
Is the APsystems QT2 compatible with battery storage?
The APsystems QT2 is a microinverter and does not directly integrate with battery storage. However, you can add an AC-coupled battery system (such as the Enphase IQ Battery or Tesla Powerwall) alongside microinverters. The battery charges from AC power produced by the microinverters or from the grid.
How many panels can the APsystems QT2 support?
The APsystems QT2 is a microinverter designed to pair with a single solar panel (or sometimes two panels on dual-input models). Each panel in your system gets its own microinverter, so the total number of panels is determined by how many microinverters you install, not by a single unit's capacity. The QT2 is rated for a maximum DC input of 1920W, so it pairs well with panels up to that wattage.
Does the APsystems QT2 have rapid shutdown?
Yes. Microinverters like the APsystems QT2 inherently comply with NEC 2017/2020 rapid shutdown requirements because each unit is mounted at the panel and can be individually de-energized. When the AC supply is disconnected, the microinverter stops converting power within seconds, ensuring rooftop safety.
Is the APsystems QT2 suitable for my system size?
The APsystems QT2 is rated at 1.4 kW AC output per unit, making it suitable for pairing with individual panels up to 1920W. Microinverter systems scale easily: simply add one microinverter per panel. This makes the QT2 suitable for systems of any size, from small 2 kW residential setups to large 20 kW+ arrays, with the flexibility to expand over time.
What monitoring options does the APsystems QT2 offer?
The APsystems QT2 includes APsystems EMA App (WiFi) monitoring capabilities via Zigbee / WiFi via ECU communication. With microinverters, you get panel-level production monitoring, allowing you to identify underperforming panels instantly. Most monitoring platforms offer web dashboards and mobile apps for real-time and historical data access. Check with APsystems for specific app availability and any subscription requirements for advanced features.
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Last updated: February 2026