Hoymiles HMT-1800-4T-208-NA
The Hoymiles HMT-1800-4T-208-NA is the mid-tier four-input three-phase microinverter in the HMT NA series, sized for 360-600W modules and delivering 1800VA peak output on 208V commercial grids.
At a glance
Value comparison (same class)
How the Hoymiles HMT-1800-4T-208-NA stacks up against other microinverters near its 1.8 kW class.
| Model | Score | Peak Eff | AC Power | MPPT | Warranty | Value |
|---|---|---|---|---|---|---|
| ★ THIS — Hoymiles HMT-1800-4T-208-NA | 87 | 96.5% | 1.8 kW | 2 | 25 yr | Good |
| APsystems QT2 | 92 | 96.8% | 1.4 kW | 4 | 25 yr | Excellent |
| APsystems DS3 | 87 | 96.5% | 730W | 2 | 25 yr | Good |
| APsystems EZ1-M | 79 | 96.5% | 800W | 2 | 12 yr | Solid |
Where this inverter works best
Panel-level optimization plus IP67-rated outdoor durability (-40C to +65C) makes the HMT-1800-4T-208-NA a strong pick across all US climates — especially hot states where shading and heat-induced mismatch matter most.
Click a state for the full local solar buying guide (incentives, payback, top installers).
Pricing
Estimated street price: $630–$990 per unit (hardware only, before installation)
Microinverters are priced per unit and you need one per panel. A typical 8 kW system using ~20 HMT-1800-4T-208-NA units would cost approximately $12,600–$19,800 in microinverters alone (excludes panels, gateway, racking, labor).
Live historical pricing trends coming in v0.3 (integrating manufacturer MSRP + reseller data).
Recent news about Hoymiles
Latest manufacturer announcements, firmware updates, and product roadmap from public sources:
Best for these scenarios
- ✓ System size: 10.8 – 54 kW (scales linearly — one microinverter per panel)
- ✓ Monthly production: 1,458 – 7,290 kWh/month (assuming 4.5 peak-sun hrs/day average US)
- ✓ Best for: Commercial and three-phase residential installations using 360-600W panels that want module-level monitoring and rapid shutdown without a separate MLPE device
- ✗ NOT ideal for: large commercial arrays where centralized string inverters are more cost-effective per watt
Full Datasheet — every parameter ▾
Key Specifications
| Brand | Hoymiles |
| Model | Hoymiles HMT-1800-4T-208-NA Three-Phase Microinverter |
| Type | Microinverter |
| Max AC Power | 1800W |
| Max DC Power | 2400W |
| Peak Efficiency | 96.5% |
| CEC Efficiency | 96.5% |
| DC Voltage Range | 16-60V |
| Max Input Voltage | 65V DC |
| Max Input Current | 15A |
| Output Voltage | 208V 3-phase |
| MPPT Trackers | 2 |
| Monitoring | Hoymiles S-Miles Cloud (WiFi) |
| Communication | Sub-1G RF via DTU |
| Dimensions | 326 x 222 x 40.6 mm |
| Weight | 5.8 kg |
| IP Rating | IP67 |
| Operating Temperature | -40C to +65C |
| Warranty | 25 years |
| Certifications | UL 1741, UL 1741 SB, IEEE 1547, CSA C22.2 No. 107.1-16, FCC Part 15B, FCC Part 15C |
Pros & Cons
Pros
- ✓ 1800VA peak output sweet-spots current 400-540W bifacial residential and small-commercial modules
- ✓ Three-phase output halves AC trunk conductor sizing versus equivalent single-phase microinverter strings
- ✓ Galvanically isolated HF transformer topology improves DC-fault containment versus transformerless inverters
- ✓ 25-year warranty matches Enphase IQ8 series at a typically lower per-watt cost
Cons
- ✗ Higher per-watt cost than a single string inverter for arrays above ~25kW
- ✗ DTU gateway is mandatory for monitoring and adds setup steps
- ✗ Smaller US installer community than Enphase means more self-commissioning for many homeowners
Best For
Commercial and three-phase residential installations using 360-600W panels that want module-level monitoring and rapid shutdown without a separate MLPE device
Is the Hoymiles HMT-1800-4T-208-NA Worth It?
The Hoymiles HMT-1800-4T-208-NA delivers 1.8 kW of AC output with a peak efficiency of 96.5% and a CEC weighted efficiency of 96.5%. This places it slightly below 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 HMT-1800-4T-208-NA 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 HMT-1800-4T-208-NA 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 Hoymiles HMT-1800-4T-208-NA can be a reasonable choice depending on your priorities and budget. Weigh its 96.5% efficiency and 25-year warranty against competing models to determine if it delivers the best value for your specific installation needs.
Installation & Compatibility
DC Input Specifications
- DC Voltage Range
- 16-60V
- Max Input Voltage
- 65V DC
- Max Input Current
- 15A
- MPPT Trackers
- 2
- Max DC Input
- 2.4 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
- 1.8 kW
- Max DC Input
- 2.4 kW
- Output Voltage
- 208V 3-phase
- IP Rating
- IP67
- Operating Temperature
- -40C to +65C
- Dimensions
- 326 x 222 x 40.6 mm
- Weight
- 5.8 kg (12.8 lbs)
Monitoring & Communication
- - Monitoring: Hoymiles S-Miles Cloud (WiFi)
- - Communication: Sub-1G RF via DTU
- - Certifications: UL 1741, UL 1741 SB, IEEE 1547, CSA C22.2 No. 107.1-16, FCC Part 15B, FCC Part 15C
Frequently Asked Questions
What type of inverter is the Hoymiles HMT-1800-4T-208-NA?
The Hoymiles HMT-1800-4T-208-NA is a microinverter rated at 1.8 kW AC output. Microinverters are installed on each individual panel, offering panel-level optimization and monitoring.
What is the CEC efficiency of the Hoymiles HMT-1800-4T-208-NA?
The CEC weighted efficiency is 96.5%, with a peak efficiency of 96.5%. 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 Hoymiles HMT-1800-4T-208-NA?
The Hoymiles HMT-1800-4T-208-NA 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 Hoymiles HMT-1800-4T-208-NA compatible with battery storage?
The Hoymiles HMT-1800-4T-208-NA 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 Hoymiles HMT-1800-4T-208-NA support?
The Hoymiles HMT-1800-4T-208-NA 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 HMT-1800-4T-208-NA is rated for a maximum DC input of 2400W, so it pairs well with panels up to that wattage.
Does the Hoymiles HMT-1800-4T-208-NA have rapid shutdown?
Yes. Microinverters like the Hoymiles HMT-1800-4T-208-NA 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 Hoymiles HMT-1800-4T-208-NA suitable for my system size?
The Hoymiles HMT-1800-4T-208-NA is rated at 1.8 kW AC output per unit, making it suitable for pairing with individual panels up to 2400W. Microinverter systems scale easily: simply add one microinverter per panel. This makes the HMT-1800-4T-208-NA 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 Hoymiles HMT-1800-4T-208-NA offer?
The Hoymiles HMT-1800-4T-208-NA includes Hoymiles S-Miles Cloud (WiFi) monitoring capabilities via Sub-1G RF via DTU 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 Hoymiles for specific app availability and any subscription requirements for advanced features.
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Last updated: May 2026