The Atmoce MI-425 microinverter is a single-module, module-level power electronics (MLPE) device designed to convert the DC output of one solar panel directly into grid-compliant AC power at the panel itself. With a nominal output of 425W and a peak efficiency of 97.4%, the MI-425 is built for residential and small commercial rooftop installations where module-level optimisation, safety, and simple cable management matter.
Operating at a safety DC voltage below 60V, the MI-425 removes the high-voltage DC arc risk associated with traditional string inverters, while its IP67-rated, 1.3kg housing and Plug-and-Play cabling keep on-roof installation fast and straightforward.
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425W
Nominal Output
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97.4%
Peak Efficiency
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<60V
Safety DC Voltage
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IP67
Ingress Protection
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1.3kg
Unit Weight
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25 Yrs
Warranty
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Please Note: Compatible PV modules for the MI-425 must have a maximum power rating that does not exceed the microinverter's DC input limits. Always check the module's Pmax and voltage window against the datasheet below before installation.
Extra-Low DC Voltage
Operates on a safety DC voltage well under 60V, virtually eliminating the risk of a dangerous DC arc fault compared with high-voltage string inverter systems.
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Class-Leading Efficiency
Delivers a peak efficiency of 97.4% and a European weighted efficiency of 97.0%, with MPPT tracking efficiency of 99.9% to capture the maximum available yield from every panel.
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Module-Level Optimisation
Each microinverter is paired with a single PV module, so shading, soiling or partial faults on one panel never drag down the output of the rest of the array.
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Plug-and-Play Installation
A lightweight 1.3kg housing with Plug-and-Play AC cabling and a one-by-one flexible module configuration makes for fast, straightforward rooftop installation.
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Cable-Free Communication
Built-in Power Line Communication (PLC) reports module-level performance data without any additional signal wiring, feeding straight into app-based monitoring.
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Outdoor-Rated Durability
Housed in an IP67-rated, Class II double-insulated enclosure built for outdoor exposure, backed by a 25-year manufacturer warranty and over 1,000,000 hours of reliability testing.
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| Input (DC) Parameters |
| Model |
MI-425 |
| Max. power of compatible PV module |
700 W |
| Max./min. input voltage |
16 to 60 V |
| Peak power tracking voltage range |
30 to 55 V |
| Max. continuous input current |
16 A |
| PV module compatibility |
54-cell/108 half-cell, 60-cell/120 half-cell, 66-cell/132 half-cell and 72-cell/144 half-cell |
| DC connector type |
MT-02502-D |
| Number of DC connectors |
1 pair |
| Output (AC) Parameters |
| Nominal output power |
425 W |
| Max. apparent power |
425 VA |
| Nominal output voltage |
230 V |
| Voltage range |
184 to 276 V |
| Nominal output current |
1.85 A |
| Max. output current |
1.94 A |
| Nominal frequency |
50/60 Hz |
| Power factor |
>0.99 (adjustable 0.8 leading to 0.8 lagging) |
| Total harmonic distortion |
<3% |
| AC connector type |
MT-02502-A (must be used with matching AC cables) |
| Efficiency |
| Peak efficiency |
97.4% |
| EU efficiency |
97.0% |
| MPPT efficiency |
99.9% |
| Mechanical & Environmental |
| Dimensions (W x H x D, without bracket) |
248 x 164 x 38.5 mm |
| Weight (without bracket) |
1.3 kg |
| Enclosure protection class |
Outdoor - IP67, Class II double-insulated |
| Ambient temperature range |
-40°C to 65°C |
| Storage temperature range |
-40°C to 85°C |
| Relative humidity range |
4% to 100%, condensing |
| Cooling |
Natural convection |
| Communication |
Power Line Communication (PLC) |
| Indicator |
1 x LED status indicator |
| Compliance |
| Safety |
EN IEC 62109-1/-2 |
| EMC |
EN IEC 61000-6-1/-2/-3/-4, EN 62920 |
| Grid compliance |
VDE 0124, VDE 4105, UTE 0126, EN 50549, EN 50530 |
| Warranty |
25 years |
What panel size does the MI-425 support?
The MI-425 is compatible with 54-cell/108 half-cell through to 72-cell/144 half-cell PV modules, covering the vast majority of residential and small commercial panel formats currently on the market.
Can I mix panel wattages across an array using microinverters?
Yes. Because each unit performs module-level MPPT tracking independently, panels of different ages, orientations or wattages can sit on the same string without one underperforming panel dragging down the rest of the array.
How is the microinverter monitored?
The unit communicates via built-in Power Line Communication, sending module-level performance data back to the system's monitoring platform without any additional signal cabling.
What is the maximum number of units per branch circuit?
This depends on local wiring regulations and circuit rating (20A or 25A); an installer should confirm circuit design against the MI-425's nominal output of 425W per the full electrical datasheet.
Is the microinverter suitable for outdoor rooftop mounting?
Yes. It carries an IP67 ingress protection rating and a Class II double-insulated enclosure, and is approved for wet locations, so it can be mounted directly behind the PV module on an outdoor roof array.
