STM Sinewave Inverter Drive Module with Grid Sharing & CT – Zero Export DIY Solar Inverter Control Board

Overview

The STM Sinewave Inverter Drive Module is a sophisticated SPWM (Sinusoidal Pulse Width Modulation) controller designed for high-efficiency power conversion. Unlike basic inverter boards, this module features Grid Sharing technology. When paired with the included Current Transformer (CT), it can sense the real-time load of your home and supplement it with solar or battery power without back-feeding the utility grid. This “Zero Export” functionality is essential for DIY grid-tie systems where net metering is not yet installed.

Key Features

• Pure Sinewave Output: Produces a clean AC wave identical to the grid, safe for fans, refrigerators, and sensitive electronics.

• Grid-Sharing (Zero Export): Uses the CT sensor to match your load perfectly, ensuring zero wastage and no “reverse” billing issues.

• STM32 Powered: Driven by a high-speed STM32 microprocessor for precise wave calculation and lightning-fast protection response.

• Multiple Protections: Built-in safeguards for over-voltage, under-voltage, over-current, and short-circuits.

• LCD Interface Ready: Easily connects to an external display (like the 1602 or 2004 LCD) to show real-time wattage, voltage, and frequency.

Technical Specifications

Feature	Specification
Control Chip	STM32 / Dedicated SPWM Core
Input Voltage	DC 12V / 24V / 48V (Selectable via jumpers/firmware)
Output Waveform	Pure Sinewave (THD < 3%)
Grid Sharing Mode	Current Transformer (CT) Feedback
Frequency	50Hz / 60Hz Adjustable
Driver Type	High-Power MOSFET / IGBT Driver onboard
CT Ratio	Standard 1000:1 or 2000:1 (included)