openinverter forum

I have my 2 leaf motors in my truck but I have not figured out the best way to do the BMS for 2 to 4 parallel Volt packs. The existing equipment from the packs in still sitting on the cells. Are they useful or is it best to take everything off and start from scratch? It seems like a waste to do that.

I still have not decided on a DC-DC or charger system yet although I have the top part of the Leaf which has the DC-DC. (I can get a tesla 10kw charger but will need help in making it run)

What would you suggest. I would prefer a plug-n-play solution if I can.

Mike

CanadaLT28 wrote: ↑Wed Sep 25, 2019 1:08 am I have my 2 leaf motors in my truck but I have not figured out the best way to do the BMS for 2 to 4 parallel Volt packs. The existing equipment from the packs in still sitting on the cells. Are they useful or is it best to take everything off and start from scratch? It seems like a waste to do that.

Have you looked at Simp BMS (here)?

One thing to note, since the packs have fixed interal Canbus IDs you need something capable of managing 4 can buses.

tom91 wrote: ↑Wed Sep 25, 2019 10:29 am One thing to note, since the packs have fixed interal Canbus IDs you need something capable of managing 4 can buses.

Is your system able to do that and could it be capable of expansion? If not, what would it take?

I am currently working on trying to get two canbuses on existing hardware. This would enable the use of a Volt/ampera pack and then chargers/dcdc on different can speed.

However I currently do not have plans for a system capable of 4 canbuses. Seeing that running that many packs separate you need to put alot of thought into safety.

Have a read of this article by Orion, https://www.orionbms.com/manuals/pdf/pa ... trings.pdf

tom91 wrote: ↑Wed Sep 25, 2019 4:22 pm I am currently working on trying to get two canbuses on existing hardware. This would enable the use of a Volt/ampera pack and then chargers/dcdc on different can speed.

However I currently do not have plans for a system capable of 4 canbuses. Seeing that running that many packs separate you need to put alot of thought into safety.

Have a read of this article by Orion, https://www.orionbms.com/manuals/pdf/pa ... trings.pdf

I will read the Orion article. In the mean time, I may just stick with the 2 Volt packs I now have. It is sooooo hard to decide as I just missed one more pack for $950. Eventually 75kw packs will be relatively cheap and I can turn the current ones into powerwalls.

I have lots to do before I have to decide on the BMS/chargers. I will pick up a Chademo port (which I don't have) so that I am ready. Should I consider using the Leaf dc/dc/charger combo for anything or should I consider it surplus for when you get the canbus working on 2 packs?

Luckily right now I am working on a new version based on the Teensy 4.0.

This should yield a BMS master with three native Canbus's, I will have two canbusses compatible with slave strings and one for 'vehicle' side communication.