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250 W microinverter for plug-in PV panels demonstration board
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The STEVAL-ISV003V1 is a demonstration board which implements the microinverter concept and is designed to optimize the power production of each single solar panel by means of DC-AC conversion. The conversion system is capable of both grid synchronization and maximum power point tracking (MPPT) thanks to the use of an advanced control algorithm implemented in the 32-bit STM32 microcontroller. The MPPT function is based on the perturb and observe (P & O) concept which seeks the best operating point of the panel, thus maximizing the energy produced under any environmental condition. The grid synchronization algorithm has the advantage over standard solutions of a decoupled control of active and reactive power. The STEVAL-ISV003V1 demonstration board uses a high-frequency (HF) isolated DC-DC converter with interleaved current and an optimized full-bridge DC-AC inverter. The typical solar panel voltage is first stepped up to about 400 V and then converted into AC to create a sinusoidal output.

An LED display provides a user-friendly interface for the end user which allows the monitoring and/or modifying of some of the main operating parameters. Two modes of operation are available and can be selected to allow either open-loop operation or closed-loop operation in synchronization with the grid.

In open-loop mode the sinusoidal reference is created internally by means of a standard lookup table, while in closed-loop mode, a sinusoidal voltage feedback which is proportional to the grid voltage is used. This system can be connected to a 50 Hz network (STEVAL-ISV003V1) and to a 60 Hz network (STEVAL-ISV003V2), based on local requirements. The RS-232 interface can be used for serial data transfer of specified voltage, current and current signals.

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Data Brief

Key Features

  • Input voltage range from 20 V to 40 V
  • Output voltage 230 V AC, 50 Hz
  • Grid connection algorithm and MPPT capability
  • Digital control section managed by the STM32
  • Reactive power management
  • RS-232 for communication
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1458: 250 W microinverter for plug-in PV panels demonstration board
3.0 553 KB

Application Notes

Description Version Size
AN4070: 250 W grid connected microinverter
1.0 4,851 KB

User Manual

Description Version Size
UM1538: STEVAL-ISV003V1: 250 W microinverter for plug-in PV modules
1.0 2,767 KB
UM1561: STEVAL-ISV003V1: firmware user manual
1.0 967 KB

Presentations & Training Material


Description Version Size
1.1 639 KB
ST products and solutions for solar energy
1.0.0 2,135 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISV003V1 gerber files
3.0.0 477 KB

Bill of Materials

Description Version Size
3.0.0 29 KB

Schematic Pack

Description Version Size
STEVAL-ISV003V1 schematics
3.0.0 488 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISV003V1ActiveSTM32F103ZET6; STH180N10F3-2; STB42N65M5Buy Direct514.5Distributor reported inventory date: 2014-04-16
Distributor NameRegionStockMin. order

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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