I’m new to this forum and must thank you all for all the very useful info that I found here!
I bought 2nd hand unused Steca SOLARIX PLI 5000-48 that I plan to use with Yuasa LEV50Ah LiMn2O4 cells from a crashed Peugeot iOn (Mitsubishi i-MiEV). The battery pack had 22 4s blocks (88 cells in series).
My original idea was to use the battery packs existing hardware and turn them into 4p 200Ah blocks so I could use 16 in series (16s4p) to make a battery of 200Ah ca 58V nominal. By setting the bulk- and equalization charge voltage to 64V that would give me 4V/cell which would not get them 100% fully charged but it only would benefit the battery life to keep them under 90% SOC and above 20% SOC.
https://www.secondlife-evbatteries.com/ ... s-row1.png
As a BMS I-m going to use the 123smartBMS with bluetooth app and a Raspberry PI will be talking with the SOLARIX PLI through the USB port with a Raspberry PI and the solaranzeige.de software (I have that running now) and the plan is that also the 123smartBMS wil be connected to the RPI so that I can have much better controls of the state of charge, and then let the PI make smart decisions based on the SOC, weather forecast, electricity price like the charge current, cut-off voltage etc.
Now reading through this very informative thread, I have discovered some serious problem with my plan and some solutions too.
1 The electrolytic capacitors connected to the battery and maybe also MOS-fets may need to be replaced with better ones in order to not blow up in the 64V setting?
2 Changing the max utility charge current often is not a very good solution because you loose 40s solar charge after each charge and it is also wearing on the eeprom. But you made better firmware with ”Dynamic Charge Current Control” that could solve that (I currently have fw 72.20).
Q1 should I replace capacitors and MOS-fets or ditch my plan to make a 16S pack and make a 15S4P or even 14S6P even though that will make it more difficult to use the existing hardware.
Q2 there are two versions of the firmware but I didn’t find what is the difference between them, one is ”for lead acid (24S), lithium cobalt-blends (LCO, NMC, NCM, NCA) (14S), and lithium titanate (LTO) (21S or 20S)” the other for 15 or 16S LFP cells. If I would like to go to the higher voltages of 15S (or even 16S) should I use the LFP version of the software for my LMO cells or the lead acid software and what is the difference?
Currently I have a test setup with used 16S GBS LFP 50ah cells and with this relative small capacity the lack of kettle compensation is very obvious but I haven tried lowering the low voltage cut-off to see if that helps.
[ Edited Coulomb: added URL link above image, since there is robot check step that needs to happen before you can see the image the first time. ]