Thanks :) The system has been working great running 24/7 for well over 3 years now. I did do a couple upgrades in that time which have improved the system all together. I added a Raspberry Pi 3 running Victron Venus OS monitoring all the Victron components in VRM with remote access capability. I then removed the old daisy chained loop cable connections to each module and got a custom solid busbar going across the entire stack with smaller angled busbars from each terminal. After that I added a much larger 100mm2 battery cable from the battery to the upper section and re did the distribution area. I removed the old Chinese MCBs and replaced them with Blue Sea Systems 187 series breakers and another custom solid busbar distribution system connected to each one. Then I added a second solar array with 6 445W shingled panels for an additional 2.6kWp of solar power, and another Victron SmartSolar 150/100Tr charge controller for the new array. I basically completely re built both the upper section and lower section since this video :)

Overheating on either the GoPro or its micro SD card. Didn't notice until after.

​@@ZaiFuchigamiI also thought of the darkness, it may have lowered frame rate to get more light

I added a second array and second charge controller after this so I have a bit over 5,500Wp of solar installed. I have some shading issues and a current bottleneck from using 24v which limits the total power I can harness. My current record is 22kWh of solar generation in one day.

Good question. The simple answer is that the load on the packs is a fraction of what it saw when driving the car motors or when Supercharging, which is when the packs heat up. The max power in or out of the pack in my system is only about 4kW, as opposed to the 400kW it’ll see in the car.

Caught that after this video went up. All fixed now :)

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You're right, I did catch that issue and fixed it after the video went up. I actually re did the whole wiring setup a few weeks ago with a new single busbar and solid right angle bus bar strips connecting each battery replacing the old daisy changed cable link.

The Victron MultiPlus doesn't have a built in MPPT charger. It's an inverter and AC charger combo unit. I also prefer having separate components for singular purposes for better redundancy.

Hi! Thanks for the kind words! Your systems sounds great, its always cool to see others DIY-ing their own off gris setups. If I didn't use a BMS the total cost would only go down around $400USD, or the cost of the simpBMS itself. The benefit of using the simpBMS is the simplicity of setup as it uses the original Tesla slave BMS boards and original Tesla wiring harness. It's almost plug and play reading data from only 4 pins from the daisy chained wiring harness. Adding a BMS to your system would be slightly more difficult as the 54V Tesla SmartCar modules don't have slave BMS boards and you'd have to use a multi channel BMS board like a Batrium or Orion system reading cell data from the balance connector.

Well, no. The Tesla modules each have a slave BMS installed which handles balancing directly on the board for that module. The slave BMS boards are then daisy chained together to send and receive data to the master BMS which is the SimpBMS I installed. The SimpBMS reads the balance data from each module and can command the specific module to start balancing if required. It also isn’t “flooding” power into the packs. All the modules are connected in parallel so they all charge at virtually the same rate.

The cool thing is that the new max power draw is so much lower than the draw of the Tesla drivetrain and motors, the batteries don’t even heat up above ambient. So cooling isn’t required.