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Greetings
I have putting together my setup and recently received my Multiplus Compact, what a nice unit! After inital configuration i discovered that in the charger settings aren't conducive to Tesla LiIon batteries.
Question 1: Does anyone have this battery, what settings do you set in the charger tab?
Question 2: I have AC In connected, is there a way to prioritize solar over AC In?
Thank you
I'd use:
-charge voltage (in old terms: absorbtion) 6x 4.1 V = 24.6 V
-float I usually set a little bit lower to prevent trickle charging: 24.6V (or 24.5) [edit, this was first a typo, adjusted)
-discharge voltage: 6x 3.3V = 19.8V
Pleas note: a battery protect only works in one direction, and is not adviced to use between battery and inverter.
What BMS are you going to use?
I'm not using a Tesla module myself at the moment, but other 6s battery modules with Tesla BMS slaves (plus SimpBMS)
Thanks Boekel.
I will use those settings.
So i should remove the battery protect from in between the battery and inverter? Where should i place in the diagram?
As far as BMS, I am still waiting for the Batrium WatchmonPlus which they promise it will manage these cells. I have also looked at Tom's simpBMS, i've asked him, via PM, if he has any in stock. I am not sure however if my slave (see below) will work.
Someone selling a few on DIYEV
https://www.diyelectriccar.com/forums/showthread.php?t=199931
Tom's BMS works perfectly with that slave board, and with Victron systems. (CANbus to the Venus)
It's currently out of stock, new batch is being made.
I'd use a breaker between the battery and the rest of the system, the SimpBMS has an output that triggers at over voltage / under voltage / over temperature, and I use that to activate a trip-unit coupled to the breaker.
I will keep an eye out for them, once them are in stock I'll grad a few. Have you looked at the Batrium upcoming WatchmonPlus, any advice?
thank you
I do not have experience with Batrium, only with REC
If you can re-use the existing OEM CMU (BMS slave boards) that is of course a big plus.
If you do choose another bms, also take a look at the BMS connection boards from Zero-EV:
https://zero-ev.co.uk/product/tesla-model-s-x-battery-module-replacement-bms-board/
https://zero-ev.co.uk/product/tesla-model-s-x-battery-module-replacement-bms-board-v1/
Please note that 25.6 is way too high for these modules. 25.2 is the max they should be charged at, and even that should be avoided. Is that a typo or am missing something? :)
I personally would not charge those modules above 80% capacity of around 23.8, (they will last longer and gives one a wider margin of error in case of mishaps) but 24.6 should be perfectly fine for near-full capacity.
Thank you!!! that was a typo (on the 'float' charge voltage)
I've edited the post.
I agree: lower voltage = more life.
When using for storing solar the charged voltage isn't kept long, so then I have less problems with it. (on backup system's I also use a lower voltage)
