OwnTech’s µVerter is an open-source photovoltaic microinverter development project aimed at making inverter design easier to understand, reproduce and repair. Its repository publishes a 450 VA target and design files, firmware and simulation material—but the target figures do not establish tested performance, certification or permission to connect a prototype to a public grid.
What is OwnTech’s µVerter?
The µVerter is a community-built solar microinverter project. Its manifesto sets out three goals: create what it describes as the first open-source PV microinverter, make the design easy to repair, and avoid dependence on proprietary cloud monitoring. The electronics are designed in KiCad, mechanical interfaces are modeled in FreeCAD, and the project includes ngSpice-oriented simulation material. The hardware is licensed under CERN-OHL-S 2.0.
Those choices make the project useful as a design that people can inspect and develop, rather than a black-box appliance. Open files and an open hardware license do not, by themselves, show that a build can be reproduced without specialist work or that it is safe or compliant when connected to a particular electrical system.
Is it a product or a reference design?
Treat the µVerter as an advanced development project, not as a verified retail inverter. The repository describes intended specifications and provides design and firmware materials; the information available here does not establish a certified, production-ready unit or a commercially supported product. The project itself is shared “as-is,” without warranty or a guarantee of safety, electromagnetic compatibility (EMC), or grid-connection compliance.
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- Turn Sunlight into Power for Your Home: Put solar energy to work with up to 96% peak conversion efficiency and pure sine wave output matched to your 120V AC utility grid. This micro inverter delivers up to 1200W continuous AC output to help offset electricity drawn from the grid. Actual output varies with solar panel capacity, sunlight, temperature, and installation conditions
- See How Your Solar System Performs: Check solar generation data and operating status from your phone with the Smart Life app. WiFi monitoring helps you stay informed about your system’s performance without checking the inverter in person. App connectivity requires a 2.4GHz WiFi network; solar generation continues without WiFi when solar input and grid conditions support operation
- Get More from Two Solar Panels: Independent dual MPPT channels track each panel separately, helping optimize energy harvest when sunlight or panel conditions differ. Each channel supports up to 18A continuous input current and a 22–55V MPPT range. Recommended panel power is 200–625W per channel; ensure each panel’s open-circuit voltage remains below 60V, including in cold weather
- Built for Outdoor Solar Use: An IP67-rated aluminum enclosure provides protection against dust and water for outdoor installations. The housing also dissipates operating heat through passive cooling. Designed for ambient temperatures from -20°C to +60°C; mount in a shaded, well-ventilated location with clearance around the unit for heat dissipation
- Grid-Connected Power with Anti-Islanding Protection: Designed to feed solar-generated electricity into an active 120V AC utility grid, with built-in anti-islanding protection that stops AC output during a grid outage. Intended for grid-connected solar systems, not standalone off-grid or backup power. Confirm local installation and utility interconnection requirements before use
OwnTech’s repository places the 450 VA design in the context of commercial microinverters from Hoymiles, Enphase, Envertech and TSUN in the 300–600 VA class. That is a useful power-class reference, not evidence that the µVerter matches those products in certification, field reliability, warranty, installation support or measured performance.
What are the published electrical targets?
The values below are design targets stated in the OwnTech Foundation’s 2026 repository snapshot. They should not be read as independent test results or as approval for installation.
| Parameter | Published target | How to interpret it |
|---|---|---|
| Rated apparent power | 450 VA | Apparent power is not the same as real output power in watts; the repository does not state a measured real-power result here. |
| PV input voltage | 16–58 V DC | A stated operating target, not confirmation that every panel or array within those nominal values is suitable. |
| Recommended PV input | 350–550 W | The repository’s recommended panel-power range; it is not a guarantee of output under all conditions. |
| Efficiency | Above 95% | A target; no test conditions or measured result are established by this figure alone. |
| Power factor | Approximately 1 | A power-quality target, not a reported test result. |
| Total harmonic distortion (THD) | Below 5% | A target; the figure does not establish a certified measurement or compliance finding. |
| Isolation | Galvanic isolation | Included in the stated design targets; this is not a substitute for verifying a particular build’s isolation and protection. |
| AC output | 220–250 V AC at 50–60 Hz | The repository explicitly says the hardware is not compatible with 110 V grids. The stated voltage and frequency range does not establish compatibility with every grid in that range. |
| Monitoring and connectivity | Wi-Fi connectivity | A stated feature target; the project’s goal is to avoid reliance on proprietary cloud monitoring. |
In practical terms, a 450 VA rating identifies the design’s apparent-power class, not a universal amount of usable household energy. Whether its output can be used depends on a complete, compliant installation and the local grid requirements. In particular, the repository’s explicit warning about 110 V grids rules out treating this design as a general-purpose inverter for those systems.
Rank #2
- 【Advanced MPPT & Grid‑Tie Efficiency – Boosts Yield by Up to 25%】: This grid tie solar inverter integrates high‑precision MPPT technology to continuously track and lock the maximum power point of your solar panels, improving energy harvest by up to 25%. With a 99.9% reverse power transmission rate, surplus electricity flows back to the utility grid efficiently – making this micro inverter an ideal choice for plug‑in solar systems and residential solar kits.
- 【Built‑in LCD Display for Real‑Time System Monitoring】: Stay informed with the clear LCD screen that displays key operating parameters – voltage, power, frequency, and current – all at a glance. This solar micro inverter allows you to verify performance instantly, ensuring your grid‑tie setup runs smoothly and helps you detect any issues early.
- 【32‑Bit DSP Digital Control for Stable & Fast Response】: Employing intelligent soft‑switching, high‑frequency switching power supply, and 32‑bit DSP full digital SPWM control, this microinverter delivers strong anti‑interference capability, rapid processing, and high intelligence. The robust digital architecture supports consistent operation, suitable for both residential and light commercial inverter applications.
- 【Full Electrical Isolation – Enhanced Safety for Your System】: The input and output circuits are completely electrically isolated, providing superior insulation and minimizing shock risks. This fully isolated boost topology ensures safer power distribution, giving you added confidence when integrating this grid tie solar inverter into your existing solar array.
- 【Six Protections + IP65 Weatherproof Enclosure】: Over‑temperature, under‑voltage alarm, under‑voltage protection, over‑voltage, short‑circuit, and overload protections are built in to safeguard the unit. The IP65‑rated housing resists rain and dust, making this solar micro inverter durable for outdoor installation – reliable performance year after year.
How does the inverter work?
PV-side conversion
A DC/DC front end controls the panel’s operating point and raises the DC bus. This stage is intended to draw useful power from the PV input while supplying the downstream conversion stage.
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An AC stage shapes the output for the grid. Measurements and commands pass through data I/O and a grid-compliance controller, which the control overview describes as handling line synchronization, harmonic limits and safe power flow. The repository’s targets for power factor and THD describe intended power quality; they do not show that a finished unit has passed grid testing.
Firmware timing and operating states
The firmware configures sensors and power stages, runs a state machine and controls the boost and inverter legs. The project describes critical control running every 100 µs, with supervisory logic for idle, startup, power and error modes. That timing describes the control design; it is not a guarantee of performance or protection in a completed build.
Rank #3
- High-Efficiency Solar Power Conversion: Designed for grid-connected solar systems, this 800W micro inverter delivers up to 96% peak efficiency with a power factor above 0.99. Converts DC power from compatible solar panels into 120V AC power for residential grid-tie applications
- WiFi App Monitoring: Connect to the Smart Life App through 2.4GHz WiFi to monitor your solar system from your phone. View operating data including voltage, current, power generation, and historical generation records for convenient system monitoring
- MPPT Solar Tracking & Wide DC Input: Built-in MPPT technology automatically tracks the maximum available power from connected PV modules. Supports a 16–60V DC input range, 22V starting voltage, and 22–55V MPPT operating range for use with appropriately matched solar panels
- IP67 Protection & Fanless Cooling: Features an IP67-rated enclosure for indoor and outdoor installation. The aluminum housing uses natural fanless heat dissipation, with an operating temperature range of -20°C to 60°C (-4°F to 140°F)
- 120V Grid-Tie Design & Multiple Protections: Designed for 120V AC grid-connected solar systems with 50Hz/60Hz operation. Includes overvoltage, undervoltage, overfrequency, underfrequency, anti-islanding, overcurrent, overload, and overtemperature protection
What files and software support the project?
The repository brings together materials intended to help people inspect and develop the design:
- KiCad electronics design files and a FreeCAD mechanical model.
- ngSpice-oriented simulation material.
- Firmware, a test plan, grid-regulation notes and contribution guidance.
- OwnTech’s Power API, modular embedded software based on Zephyr.
Official examples for the Power API cover boost converters, grid-forming and grid-following inverters, and AC/DC microgrid patterns. These examples provide software patterns and context; they do not certify a µVerter build or prove that its hardware, firmware and protections meet local requirements.
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Can you build one from the files?
The project provides a starting point for technically capable builders to study and develop a design. But having design files is not the same as having a ready-to-assemble kit or a validated set of manufacturing instructions. A builder still has to establish that the chosen parts, assembled board, firmware, mechanical construction and protection measures work together safely.
Rank #4
- Efficient Solar Power Conversion: Designed for 120V grid-connected solar systems, this 800W micro inverter delivers up to 96% peak efficiency with a power factor above 0.99, helping convert available solar energy into stable AC power for everyday home solar applications
- Smart WiFi App Monitoring: Connect through 2.4GHz WiFi and use the Smart Life App to monitor key operating data from your phone. View PV input, grid information, power generation, and historical generation records for convenient daily system monitoring
- MPPT Solar Tracking & Flexible DC Input: Built-in MPPT technology automatically tracks the maximum available power from connected PV modules. Supports a 16–60V DC input range, 22V starting voltage, and 22–55V MPPT operating range for appropriately matched solar panels
- IP67 Protection for Outdoor Use: The IP67-rated enclosure helps protect internal components from dust and water exposure. Its aluminum housing provides natural fanless heat dissipation and supports operation from -20°C to 60°C (-4°F to 140°F)
- Multiple Grid-Tie Protection Functions: Designed for 120V AC grid-connected systems with 50Hz/60Hz operation. Built-in protection includes anti-islanding, overvoltage, undervoltage, overfrequency, underfrequency, overcurrent, overload, and overtemperature protection
Before considering any build, a responsible engineering process would need to address, at minimum:
- Whether the components and layout match the intended electrical and thermal conditions.
- Protection against faults, excessive current, stored energy, overheating and fire.
- Verification of isolation, control behavior and failure handling on the completed hardware.
- Electrical safety and EMC testing, followed by assessment against the applicable grid-connection rules.
The repository’s existence of a test plan and grid-regulation notes is useful, but it does not establish that these checks have been completed for a particular unit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is it safe or legal to connect to a house?
Do not connect a µVerter prototype to the public grid. The project maintainers state this directly and disclaim any guarantee of safety, EMC compliance or grid-connection compliance. A grid-tied inverter can expose people and equipment to hazardous voltage, fast-switching electronics, stored energy, fire risk and interactions with the electrical network.
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- 800W High Power Output & 96% Efficiency – Delivers up to 800W output with 96% conversion efficiency and dual MPPT tracking for stable, efficient solar energy conversion. Supports 16-60V DC input, 60V max input voltage, and 22V start voltage for reliable performance.
- IP67 Waterproof for Outdoor Use – Built with IP67 waterproof and dustproof protection to withstand rain, snow, heat, and cold. Operating temperature range from -40℃ to 65℃ ensures long-lasting outdoor durability.
- Smart WiFi Monitoring & APP Control – Built-in WiFi allows real-time monitoring through mobile APP. Easily check power generation, energy data, and system status anytime, anywhere.
- Compact Plug & Play Design – Compact size with included 16.4ft AC cable for fast installation. Lightweight and space-saving design ideal for balcony solar systems, home solar setups, and DIY applications.
- Wide Solar Panel Compatibility – Compatible with most solar panels and suitable for plug-and-play solar kits, balcony solar systems, and residential solar applications. Built-in multiple safety protections for stable daily use.
The repository identifies EN IEC 62109-1 and EN IEC 62109-2 for photovoltaic converter safety, EN 62920 for PV power-conversion EMC, and ETSI radio standards for Wi-Fi equipment. Naming standards is not the same as demonstrating compliance. The applicable approval path also depends on the country and its grid rules; passing one kind of assessment would not, on its own, establish every other required approval.
For a real installation, use equipment and an installation process accepted by the relevant local authorities and grid operator, and involve qualified professionals as required by local rules. Do not infer permission to connect the µVerter from its published voltage, frequency or power targets.
How should you compare it with a commercial microinverter?
Compare documented evidence, not just headline power ratings. OwnTech’s repository gives the µVerter a target rating of 450 VA and places it alongside commercial products in the 300–600 VA class, but the material summarized here does not establish equivalent product-level data for the other comparison dimensions.
| Comparison point | µVerter project information | What to verify for a commercial inverter |
|---|---|---|
| Power class | 450 VA target (OwnTech Foundation, 2026 repository snapshot). | Rated output and the conditions attached to the manufacturer’s rating. |
| PV input window | 16–58 V DC target; recommended PV input 350–550 W (same snapshot). | Allowed PV voltage and current range, panel compatibility and operating limits. |
| Efficiency and power quality | Above 95% efficiency, power factor approximately 1 and THD below 5% are stated targets (same snapshot), not established test results here. | Measured or certified figures, their test conditions and the applicable product documentation. |
| Isolation | Galvanic isolation is a design target (same snapshot). | The product’s isolation design and relevant safety documentation. |
| Monitoring and repair | Wi-Fi is a target; the project emphasizes openness, repairability and avoiding proprietary cloud dependence. | How monitoring works, whether cloud access is required, and what repair support is available. |
| Certification, warranty and installation responsibility | Not established as certified, warrantied or approved for a particular installation by the project information summarized here. | Local approvals, warranty terms, installer requirements and manufacturer support. |
A commercial unit with a similar VA rating may be more appropriate where a buyer needs a documented installation pathway, warranty and manufacturer support. The µVerter’s distinguishing value is its open development approach, not evidence that it is interchangeable with a certified retail inverter.
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