question

@aasgardvidar, Victron will not support (for obvious reasons) any used battery system; neither Tesla batteries nor the SIMP BMS to which you refer are supported devices, so although you may or may not be able to get them to work within a Victron system, you also may or may not void some or all of the connected-devices' warranties by so trying.

For a complete list of Victron-supported batteries/battery systems, please see this list. Using any battery or other component outside of this list may or may not work, but will be unsupported by your Victron distributor and, as mentioned, runs the risk of causing unexpected behavior within the system and/or voiding warranties, so regrettably you're very much on your own if you choose this route.

Furthermore, given the very high possibility of thermal runaway in Tesla batteries, since they're not the safe and stable LFP chemistry that is the current standard in mobile use, you're definitely running several very significant risks by doing this and I very strongly advise that you re-evaluate your current planned system.

Updated Jun 18, 2020 for changes:

There are many folks using Tesla/SimpBMS/Victron. As Justin said you need to be careful. The SimpBMS makes it pretty straight forward if you have a complete Victron system.

NOTE - the information below is for informational purposes only. I won't give any settings, just an overview. I used the following article as a starting point - <edit> note that there is no BMS in this example - possible safety issue </edit> : https://www.mortonsonthemove.com/toms-tech-blog/updated-tesla-module-rv-installation

I consulted the SimpBMS and CCGX manuals for everything else. The only thing not really documented is how the entire system works. I try to explain that below.

System:

• Single Tesla S 233 AH battery
• SimpBMS in ESS Mode
• Main and PreCharge Contactors connected to the SimpBMS
• 1 LEM-CAM300 Sensor connected to the SimpBMS
• Victron CCGX
• Victron 24v MultiPlus 3000
• Victron Smart 150/35 MPPT
• Victron Smart BP 100
• Victron BMV 712 (not needed with the SimpBMS - left over from my prior setup)
• Victron Orion 24/12/70 (overkill, I can only pull a max of 30amps)
• DPST 24v relay
• 24v Temp relay to power on a battery warmer

The SimpBMS is connected to the CCGX via VE.Can

The MPPT and BMV 712 are connected to the CCGX via VE.Direct

MultiPlus connected to the CCGX via VE.Bus (CCGX is also in DVCC mode)

MPPT battery line connected to the Smart BP100 (relay allows charging when closed) THIS IS IMPORTANT - it can only be used one way.

Relay on the CCGX drives the DPST relay

DPST relay enables charging on the MultiPlus and enables the BP to allow the MPPT controller to charge (see above)

With this configuration all battery voltage settings and alarms are done on the SimpBMS console. As a backup, I programmed the settings into each Victron unit.

How it all works:

The SimpBMS provides all voltages from the battery and sends any alerts to the CCGX while in DVCC mode. The CCGX relay is set to open when an alert is received and opens the DPST disabling MPPT Charging via the BP100 and stops the MultiPlus from charging as well.

While in DVCC mode the MultiPlus and MPPT settings are not used. The SimpBMS appears as a Smart Battery and directs the charging voltages and the CCGX prioritizes the MPPT over Shore power if both are available.

If anything goes critical SimpBMS will disengage the Contactors disconnecting the battery from the entire Victron system.

Connection Path:

Battery +

Switch

200 Amp fuse

Precharge Contactor (Connected to SimpBMS) -> Resistor

In parallel to precharge Contactor a Main contactor

Positive Bus Bar

• MultiPlus (Charge enable monitored by Aux1 input from relay)
• Relay Power
• CCGX Power
• BMV712 Power
• 24v Temperature controlled relay for warming blanket
• Orion 24/12 converter out to a 12v positive bus bar

Negative Bus Bar

Shunt

LEM-Can 300 (Connected to SimpBMS)

Battery -

MPPT Path

Battery +

BP 100 in

(Switch controlled by relay)

BP 100 Out to the positive bus bar

I am using a buck converter off of the Tesla to downstep to 12V and feed it to the SimpBMS unit. I added a cheap AC trickle charger for charging the generator battery.

Hope this helps.

John