How to setup the old Multiplus with 19xxxxx firmware so that the Tesla is charged and discharged correctly ? I mean setting up minimal and max voltages.
asked
Setting up Old Multiplus with firmware 19xxxxx and Tesla Model S batteries
I'm having a very hard time configuring SimpBMS with 6S Tesla pack, combined with an older version of Multiplus firmware 1910209, MPPT 100/50 and Venus GX.
I'm posting some pictures of my settings from the real time situation, maybe some will find an answer why it is not working as it should.
1.) SimpBMS settings
I'm sorry I missed the fact that the old firmware is not capable of using DVCC. I don't know from memory if the MPPT's listen to the BMS without DVCC enabled. did you try this?
The Multi you can use the two wire bms assistant I think.
Hello Tomskk,
While it might work, there are limitations using Tesla batteries with Victron equipment - there is a very in depth community post here that outlines what those are:
Batteries that have been tested and are known to work reliably and as expected with Victron equipment are documented here - https://www.victronenergy.com/live/battery_compatibility:start
Thanks Guy, can you explain me the logic of Multiplus and charging from solar cells. I'm using Smart Solar 100/50 and am a little confused who is in charge of charging the bateries ? MPPT or Multiplus ? Multiplus won't be connected to grid.
Hi @tomskk
Your BMS will be in charge of the charging voltage and current, maximum discharge voltage you'll have to set in the Multi
For safety set the charging voltage in the Multi and MPPT to a maximum of 4.1V per cell, so 24,6V
The BMS connects to your Venus, the Venus tells the Multi and MPPT what to do, if you configure like this document:
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom
only you can leave 'SVS' on at the DVCC settings.
But....please make sure you have your wiring etc. properly and safely installed, maybe ask an electrician to help you with that.
Also make sure the battery has enough cooling, and your MPPT is mounted upright so the cooling fins can work.
Mounting equipment that produces heat onto a wooden surface I wouldn't recommend, the MPPT can get quite hot, and will dry out the wood until it gets easily combustible.
@Boekel thanks for the answer, will follow your recomedations. Yesterday the storm came to early and the sun was gone, and Tesla was only at 21.7V (bummer) so the Multi didnt want to start :-).
Disconected the NG125N and now must wait for the sun to fill up the Tesla over 21.8V so that the Multi will start inverting.
How much current can I allow MPPT to put through to Tesla cells ?
