ABMS + Victron Multiplus 3k - Max Charge Amps & Settings


  • Interesting start to my Multiplus 3K with the ABMS. Followed the instructions on page 20 of the ABMS/Victron/Wakespeed manual to get the BMS talking and managing the MP3K via CANBus. I did update the MP3K settings via Victron Connect to:

    General Table: Enable Battery Monitor, Update Battery Capacity (1120ah), Reduce incoming Amps to 13 (I\'m bench testing in the garage). Left everything else default (85% SOC for Bulk finish; Charge Efficiency 1.0)

    Charger: Enabled Lithium. Left everything else default.

    Disconnects/Alarms on Startup From there I switched the main on/off from the MP3K to the battery bank and in shortly thereafter I could hear the charger activate and see the inflow of current via the REC BMS PC app as well as the GX screen. However, moments later I heard the main connector relay disconnect. This cycled a few times and then I got a series of \"CAN-Bus battery / Alarm / High Voltage\" warnings with voltages ranging from 13.88 to 13.98v. Troubleshooting These warnings were confusing as they only represented 3.4975v per cell which is below the end of charging (3.58v) and max cell voltage (3.65) set in the ABMS settings. Nonetheless, I tried to resolve this looking to a few sources, which led me to think the 14.4 default charge rate on the Victron might be too high. So I reduced absorption to 13.8 and float to 13.5.  This didn\'t resolve it. After several attempts which ended like the first (startup... initial charge... disconnect... reconnect... disconnect... alarm... manual turn off of charger), I reduced the standard 90 Amp output of the MP3K to 50 Amps and tried again. After this the charger started and the BMS did not disconnect. While it\'s nice for things to be working, I\'m wondering why it\'s not possible to charge at the full 90 Amp capacity of the MP3K. Also, wondering what are the preferred charger settings for the MP3k (absorption/float voltages, etc)?      


  • Not sure what\'s causing  your issue -- I have a similar hardware setup  with a MP3K and am able to charge at the full 120A capacity reliably. However, I am using lower voltages for  bulk and float (I\'ll check but  I  think bulk is 14.2v or lower)

  • I think I figured it out. I\'m bench testing everything in my garage with the inverter plugged into a 15A 120v circuit. I\'ve limited the MP3k to 13A input. From what I read last night after more searching, it appears the MP3k would trip off when trying to charge at 90A with the smaller AC input. Since then, I\'ve been able to test things and found I can get about 60A charging when limiting to 13A incoming.

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