Hello everyone. I’m having a minor problem with my Multiplus II 3000 GX inverter. The USB port has stopped working. That is, it supplies power, but it no longer recognizes the Smart Solar charger. I know the charger is working because I tested it by connecting it directly to the ve.direct port (ins…

[image] Multiplus II 3000 GX USB died DIY I’m using the USB on my Multiplus II 3000 GX as a VE direct connection to an MPPT that suddenly stopped working. I won’t get any response using the USB port anymore and there are no other ports to try. Can I reset the U…

Try to connect the ve.direct to usb cable to a smartphone or PC with Victron Connect and see if communication with the solar charger is possible.

Indeed, after connecting the charger directly to the smartphone via the USB/ve.direct interface, it doesn’t show up in the Victron Connect app. So I suspect it’s the cable’s fault—who would have guessed? I ordered a new cable. I’ll let you know once I test it to see if it works. Thanks for the tip.

Hello again, the new cable arrived. I connected it and everything works. The charger is back and visible in the system. I wouldn’t have thought this USB/VE direct cable was so fragile. It probably has some kind of protection. I wonder if it’s repairable and if I can try replacing something?

If you need PCB shots of an undamaged one, here are some USB-VE.direct PCB - Google Drive

Oh, thanks a lot. I’ll try to take it apart and see if I can see any damage. Do you know which component is most likely to fail? I probably created a ground loop when disconnecting/connecting the chargers.

Not offhand no. The damage is unlikely to be visible

[image] Cywiński Rafał: ground loop when disconnecting/connecting the chargers. That should not harm the adapter, since it has an Adum1201 optocoupler with about 500V isolation https://www.analog.com/media/en/technical-documentation/data-sheets/adum1200_1201.pdf

Ve.direct ports are isolated. A VE.Direct to USB interface cable can be purchased from Victron Energy (“VE.Direct to USB”, part number ASS030530000). This interface cable provides a virtual comport through USB as well as galvanic isolation. Most Victron products came with 5 year warranty So if f…

Problem with the USB port on the Multiplus_II_3000_GX

Q&A and troubleshooting

lxonline (LX) 3 February 2026 16:35 2

There are other options.

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Problem with the USB port on the Multiplus_II_3000_GX

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