Question for battery pros
I have a 12s9p 40T pack and went for a long ride today. Battery was reading roughly 41.5v when I got home. When does it completely die? I felt like I had zero sag issues and my app was reading 0% battery, so curious how far down I should push it.
41.5v is only 3.45v per cell, almost storage chargeâŚ
Normally I stop about there as well, but on a long ride i feel comfortable taking the cells down to 3.0v or 36v pack voltage
What are your battery cut-off voltages?
I honestly donât even know how to set those lol, is it in VESC tool?
Yeah itâs in the vesc toolâŚ
And I donât know about your bms⌠If itâs a smart bms and is running discharge there may be a setting in there as wellâŚ
itâs automatic in the wizard idk what the default is, 3.2V?
Nah itâs not a smart BMS, itâs probably set to default.
Is it bad long term to run it down to 3.2?
if you rip a battery hard enough to ruin it you deserve to buy a better one.
It sounds like you gots some reading and learning to doâŚ
3.2v per cell is pretty safe
Haha yeah when it comes to the technicals about batteries, I definitely have learning to do. Thanks for the help though!
Learn to read the spec sheet on your specific battery cell, look at the discharge graphs and the battery aging data and then youâll be much more capable at intelligently setting up your battery as it suits your use.
Im gonna look into it. Shouldnât be hard. Honestly want some now for pack centers and edges, etcâŚ
I think itâs like glass-fiber sheet or something, Iâve seen it in many stock batteries too
Edit: looks like itâs not hard to get since itâs on amazon
Iâm building something similar. I have almost everything I need. Im building a waterproof( except being submerged) portable battery pack. Itâs going to have about 2.5kwh pack with a 2kw 24v inverter.
If itâs G10/FR-4 thatâs âblankâ (no copper) circuit board material. Pretty tough and doesnât start to go plastic until itâs up around 100°C if itâs the regular type. There are higher temp versions too though.
Yo!
Iâve been searching for a smart bms for several months now and had some shipping issue with LLT power.
That issue is most likely solved now and my new plan is to buy 10-15 bms (charge only) to make up for the expencive shipping rate⌠Is there a demand on those bmsâs here? I only need two 10s for my builds and will sell the others.
He ships from US right?
Oh youâre EUâŚmaybe the guys at Nexus or Apex might be convinced to stock them?
Here you go
