Easun Firmware Update Jun 2026
Most Easun inverters (including popular models like the SMG II and SMH III) follow a similar update procedure using a PC. Guide to Firmware Update | Lenovo US
Before beginning, ensure you have the following hardware and environmental conditions to avoid "bricking" the device: Original Communication Cable:
Connect your laptop to the inverter's communication port. Open "Device Manager" on your PC to identify which the inverter is using. Step 3: Run the Reflash Tool
You will likely need the RS232 to Ethernet adapter cable that came with the inverter. easun firmware update
The inverter fans may spin up to maximum speed, and the LCD screen might go blank or show U1 / UP .
Click "Browse" or "Open File" and select the .hex firmware file Easun provided.
If requested by support, safely power down the unit and check the white sticker printed directly onto the green mainboard. Most Easun inverters (including popular models like the
: Use the WatchPower app or scroll through the inverter's LCD menu to identify your current CPU and remote panel firmware versions. Establish Connection :
Executing the update requires a direct tether between your Windows PC and the inverter. Step 1: Gather Your Tools Windows-based Laptop or PC. Original communication cable (RJ45-to-USB or RS232-to-USB).
Easun produces variations of control boards even within the same model name. Step 3: Run the Reflash Tool You will
Do not mix up firmware meant for high-voltage MPPT models (e.g., 450VDC PV input) with low-voltage MPPT models (e.g., 150VDC PV input).
EASUN does not maintain a public, centralized firmware repository. You can obtain files through:
Use the inverter screen menu (usually the last few program settings) or the WatchPower/SolarPower software to find your current CPU/U1/U2 firmware version.
Most modern Easun units are updated using a Windows laptop running a proprietary manufacturing utility like , WatchPower , or a standalone ISP (In-System Programming) Tool . Step 4.1: Preparation and Isolating the Inverter