I’m not surprised by the amount of sag. I would say I see similar sag on with 25rs. Thats why I want to build a bigger pack with 18650s. I have 4p pack also but considering 5p for my next board for this reason (30qs). I would say you’re cutting down range by a lot though as you might reach cutoff sooner than if you were pulling less amps. How much range you get?
Looks pretty standard. Check the two squares I highlighted. In the first pic your at about 3.64v/cell resting. After you pull load (74A, rounding to 80A) that’s about 20A/cell which gets to about 3.1-3.15v/cell at the same mAh which is about what you’re seeing with 37.8v/12 = 3.15v/cell
Seems like a lot, but if you look at discharge charts, it is exactly what you’d expect
You’re drawing about 75A, which is almost 20A/cell. Your cells drop to 3.64V nominal voltage under this load. Comparing the 0.2A line to the 20A line, you see a voltage drop of 0.5V/cell. At 12s this equates to a 6.0V drop at 80A total
The vesc won’t cut out it will just reduce power. That can actually be a problem though because it won’t cut power and you can still throttle very slowly under your cutoff end. It’s pretty obvious you should stop though.
That’s really good range I would say I only get about 16miles on 25r 12s4p pack the way I like riding.
I really should do this at some point with my 30Q 12S5P packs.
behaviorally they seem to give you serious load support all the way up until the BMS shuts down but i’d love to see the actual numbers in action (meaning video overlays like this) without having to move to the android ecosystem.
if anyone else has a similar config and can do so please post it.
I’m more curious about your power consumption. Wh/AH there can be huge difference between riding style. For example slow cruising for me its 15 and normal riding it’s 23 and going a little faster I’ve seen 30 wh/ah per mile so power consumption is a huge factor
How much range/miles do you get minimum or average with the lipo packs you have?
i’m curious about this too because on the packs i use i get over 30 miles at what you consider normal riding speed, which is kind of fast for a lot of people.
sag in very high discharge packs vs sag in lower discharge packs of higher overall power is a neat topic because the higher the cell count in the lower discharge packs the closer you get to being a higher discharge pack while simultaneously eliminating more sag.