acollins22
1 µW
- Joined
- Dec 9, 2019
- Messages
- 4
Hello everyone,
I have recently started on my first EV project, the recommissioning of a Citroen C1 Evie from 2009. It has been pointed out to me that it is a lost cause because of its faults but being a hands-on rather than off-the-shelf kind of guy and also because it owns me money, I'm in up to my neck.
The first problem is the batteries which were beyond reclamation and have been scrapped. It's in their replacement where I need your help.
There were two trays of Thundersky 160AH/3.2V LifePo4 cells. Sixteen under the bonnet, 9 under the rear seats where the fuel tank would have been. They were wired in series and so I should have 80V. There are 400A fuses in each battery tray.
I have sourced a number of EIG C020 LiPo cells (20AH/3.2V) that I plan to use but I could do with a bit of guidance.
A bit more background... There is an AC charger in the car, a 12V DC/DC converter, a bespoke BMS (monitor and balance only) and Curtis motor controller.
If I was to replace the LifePos with the same power LiPos, I would need 22S8P which would give me about the same power at about 81V. Close enough for folks.
I would like more power though and here's where I have dilemmas.
I would like 200AH cells rather than 160 provided by Thundersky. To get that, the obvious way is 22S10P but I an not sure that 10 cells paralleled up is a good idea. Is it?
Failing that, I could go for two strings of 22S5P but would need to replace the existing BMS with two new ones. Is that wise? Would I need some more control kit than just two BMSs in parallel?
What do you think?
Thanks for your help.
Andy.
I have recently started on my first EV project, the recommissioning of a Citroen C1 Evie from 2009. It has been pointed out to me that it is a lost cause because of its faults but being a hands-on rather than off-the-shelf kind of guy and also because it owns me money, I'm in up to my neck.
The first problem is the batteries which were beyond reclamation and have been scrapped. It's in their replacement where I need your help.
There were two trays of Thundersky 160AH/3.2V LifePo4 cells. Sixteen under the bonnet, 9 under the rear seats where the fuel tank would have been. They were wired in series and so I should have 80V. There are 400A fuses in each battery tray.
I have sourced a number of EIG C020 LiPo cells (20AH/3.2V) that I plan to use but I could do with a bit of guidance.
A bit more background... There is an AC charger in the car, a 12V DC/DC converter, a bespoke BMS (monitor and balance only) and Curtis motor controller.
If I was to replace the LifePos with the same power LiPos, I would need 22S8P which would give me about the same power at about 81V. Close enough for folks.
I would like more power though and here's where I have dilemmas.
I would like 200AH cells rather than 160 provided by Thundersky. To get that, the obvious way is 22S10P but I an not sure that 10 cells paralleled up is a good idea. Is it?
Failing that, I could go for two strings of 22S5P but would need to replace the existing BMS with two new ones. Is that wise? Would I need some more control kit than just two BMSs in parallel?
What do you think?
Thanks for your help.
Andy.