Multiplus II 48/3000 GX keeps going offline

DIY
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1

I bought an unused Multiplus II GX off ebay a while ago (August 2023) and finally got it installed with a few solar panels in late 2024, along with a second Multiplus II 48/3000 (non GX) to parallel up. It works fine supplying AC to my offgrid installation, but now we have sun in the UK and the batteries are fully charged each day the GX keeps going offline, and restarting. The output of AC is fine during these times.
I did a google search and came across this old post: Multiplus II GX regularly rebooting and causing MPPT RS to go offline - VictronEnergy
This states that some older GX equipped units have a faulty GX card. Mine has a 2021 build serial number and I am wondering what my options are. Obviously the original owner and supplier are unknown to me, buying the unit secondhand. Will Victron honour the warranty or am I on my own? I am happy to dismantle a unit and swap out a board, but I don’t want the system to be offline for weeks. Or do I have to change the resistor myself as described in the pdf about the problem (see: https://communityarchive.victronenergy.com/storage/attachments/2021-05-easysolar-ii-gx-and-multiplus-ii-gx-displa.pdf )

Thanks, Paul

2

Are you using a system where the DC voltage exceeds the specified 55V?
Then are you using a 16S battery system?

Normally Victron tolerates this case, because the warranty still applies for the resale of components. You just don’t have a dealer through whom the exchange can take place …

3

I’m actually using a 14s Li Ion (leaf cells) system 57.4V top voltage (4.1V/cell). But this is well within the specs of the inverter.
So are you saying I should contact Victron directly and they should honour this?

4

14s Li Ion (leaf cells) system 57.4V top voltage … :+1:

Have you ever directly compared the serial numbers to see if the device falls into this category?

Since there is a technical defect in the production on the part of Victron and no user error on your part, I would be very optimistic … But even if Victron were to rule this out … the small SMD resistor can certainly be replaced by someone who has a bit of experience with soldering.
I’ll keep my fingers crossed

5

Hi i had a similar problem in 2022, my issue was even worse, whole system just got stuck and would charge over 60v (48v batt), only a manual reboot helped

my victron dealer swapped the gx board, i could wait for repair

Ask your local official victron dealer what they can do for you

This old post was als my problem: