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: Specifically for your exact model number. Contact EASun Support or check their download portal to obtain the correct .hex files.
: Expert users like "Coulomb" provide patched firmware versions to address issues like MPPT "stuck" voltages at low levels, which official updates may not fix. Critical Risks to Consider
Once the update finishes, you must recalibrate your settings: Turn on the inverter's main power switch. Reconnect your PV and AC grid breakers.
Right-click the update application ( .exe ) and select . easun firmware update
Right-click the Windows Start button, open , and expand the Ports (COM & LPT) section. Note the number assigned to your adapter (e.g., COM3 ). If you see a yellow warning triangle, you must install the driver for your USB-to-Serial adapter. 3. Prepare the Files
Users turn to firmware updates for a variety of reasons, primarily to fix a specific bug or gain new functionality.
Wait for a popup window stating "Update Successful", "Ready", or "100% Complete". Step 5: Reboot and Verify : Specifically for your exact model number
This feature enables users to update the embedded firmware of EASUN power inverters (e.g., Solar, Off-Grid, Hybrid series) to improve performance, add new functionalities, or resolve known issues. The update process supports both local (USB/RS232) and remote (WiFi/Bluetooth dongle) methods.
Click "Browse" or "Open File" and select the .hex firmware file Easun provided.
: The inverter display will often go dark or show an "UP" status during the 5–15 minute process. Do not disconnect cables until a "Successful" message appears. 3. Known Risks & Issues Issue Description Bricked Inverters Critical Risks to Consider Once the update finishes,
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).
with your order number and model to receive the correct firmware package. Software Hubs: WatchPower/SolarPower: Used for SPR, SMR-II, and VE-II series. Voltronic FTP: Often hosts firmware for SMV, SMW, and SV-II series. Manuals & Drivers: EASUN Energy Download Center for general documentation. 3. Step-by-Step Update Procedure Prepare Connection:
Disconnect heavy AC loads (appliances) from the inverter’s output to prevent power drops during the flash.
