openinverter forum

So the plan is simple. Take the race car built over 30 years ago and modernize it.

After breaking many drive shafts that were supposed to be unbreakable, I decided to go electric. As I have a Roadster I could only think of one solution for what I wanted. So I started with a LDU with the revision done so it’s a good candidate to push the limit with.

After doing a lot of reading the simple solution was to go with Toms BMS, Damien’s LDU control board. I have an 80A original HPWC for my Roadster so it seems crazy to pass up on the gen 3, 72a charger, once again controlled by Damien’s board. A Volt DC/DC converter was employed for the 12v heating and switching, while deciding on batteries I wanted to use the whole Tesla BMS but with higher output cells. I grabbed 12 Pacifica modules and an in the process of reconfiguring them for 2P 96s which should happily give me 1200A+ for the short duration I will be using them.

Great project, good to so some use my BMS in another frankenstein.

How easy is it to reconnect the Pacifica cells? Also are there any heat spreaders in those modules Pacifica?

Did you check the temp sensor whether it is close to the same as a model S pack, as you need to know how hot these are getting if you are going to push them?

I literally took the module apart last night before it got to cold. There are 4 sensors on each module both on the outer pouch making one of each pair fairly redundant. I’ll put my meter across them today. Between each pouch there’s a substantial aluminium plate that is an inverted T so I’m going to sit them on another plate to sink heat. Each series cell is connected to a tab that also supplies the balance leads. Ill take more picks today before o go home. But there’s a lot of extra pins I want to trace first. I think I can make the BMB boards and the modules plug and play meaning swapping out will be fairly straight forward. The modules will be 2P 8S Making additional checks with my cellog 8 a simple task.

The trays are lined with aluminium and sandwich a pair pouches except for the end plates. So it’s pouch-plate-pouch-pouch-plate. The trays holding the plates interconnect like LEGO.

On the end of the assembled module this end cap lines up with the pouch cell tabs. They are identical as they are 1p 16s. Each plate also has 2 temperature probes. The main plug has 12 pins. 9 for monitoring the cells and balancing and I assume 3 for the 2 thermistors sharing a common. I’ll trace these later.

One of the end plate I’ll call the ‘power’ side terminates into the positive and negative terminals, this is the side I will be using to monitor and connect the newly formed 2P 8S modules.

Rover V8 removed, a long time since the engine bay has been empty. Yes when I built the headers one side went around the steering shaft. At the time it seemed trivial.

Some dirty calculations
The Rover V8 weighed 320lbs
The Porsche Transaxle weighed 125lbs
The Tesla drive unit 295lbs.
The modules are 40lbs each totaling 480lbs
I am hoping I can fit 4 in the trans tunnel
That leaves 320lbs to be either put back up front or to play around with

https://photos.app.goo.gl/aNZ4tLZSKVZ6i4ye7
In case anyone was hoping to balance charge via the plugs, the circuit board has pretty thin traces under the vulcanization