Endless Sphere

Did modification to my windows logging software, so it could now automatically detect what battery pack is installed. There will be endurance race at the end of month, 50 laps in a 1km track. I need to cap my performance so that i could drive 50 laps and not overheat my motor. But with my calculatio...

I'm using this in my kart, its very small and light.
https://www.mouser.ee/ProductDetail/108-HA1SV12008PRFA

if you have 2 sets of winding it should work Planned but low priority, i heard only 3 people requested it so far If you will implement it in near future, will it also be available with current versions via firmware upgrade? I have a revolt rv-160pro motor that i have installe sin/cos myself, becaus...

January 2019 I tested one of my 7s 5Ah brick with 70A As you can see that after 3 minutes my duo 4010 stopped discharge because of cell voltage went under 3,5v under load. I must admit that it was not charged to 4,2v but to 4,1v so there can be a little bit more inside :) And as I said earlier I got...

I used in practice 5,37Ah and in 1st race 6,44Ah, so together 11,81Ah. Battery should be 35Ah but when I tested one brick with 70A then usable was around 3,6Ah, that makes usable in whole battery 25,2Ah :) And as cell voltage after 1st race were around 3,81v i tought that i let lipo be in storage vo...

Went to race lately, it was special race as we used obstacles and only 3 laps each race. All together 1 practice and 3 races. I used at practice and first race my lipo battery and 2nd and 3rd race my smaller lifepo4 battery. There was no elecricity in that track :( And it seems that lipo has more po...

Tested lipo pack in kart track. Was not regular race but special event, only 3 laps + tire warmer lap. But it seems that voltage drop was very minimal. 558A was max i got on that track (because of the obstacles) and with that voltage was 103,43V. At beginning of the race voltage was 114,51v but max ...

How about a wrecked zero motorcycle? You can get from there motor + controller that are already working together, so no need to program the controller. You can use twist throttle also with a kart if you want :) If you make a similar voltage battery that zero has (if battery is broken on wrecked zero...

Yes, i have rewelded the sidepods and using larger tube that goes over the frame. sidebars.jpg And i used 5mm aluminium sheets so I could place my first battery cells "winston 60Ah lifepo" 16pcs in left and right. sidebumperholders.jpg With my lighter 37kg small lifepo4 pack left and right side are ...

Actually when racing I do not have time to look at my tablet at all. I have cycle analyst in my wheel and in straights i can see how many Ah I have used, but thats also not important anymore, because I know how many Ah i'm using per lap. I have low voltage cutoff configured in sevcon and that is eno...

Zeva by themself are selling also master unit.
https://zeva.com.au/index.php?product=132

Yes I'm. But zeva bms is not stand alone product. And for me it is just perfect because of that. You need some kind of master communication unit, zeva bms just listens commands and outputs information through canbus. Also it's balance current is very small, but it's not revelant for me. I have 9 pcs...

Changed my zeva measurements wires to eliminate false reading due voltage drop between pack interconnections.
And now I can measure what is voltage drop between my packs that are connected to 7x8AWG wires.
Actually lipo bricks have 10AWG wires itself

It is actually the same weight as my 2,5kw lifepo4 pack. My small lifepo4 pack has also had over 600A output. The voltage drop were yes a little bit higher in lifepo4 but then lifepo4 does not have voltage drop when it gets empty as does lipo. Yes I measured tempereture in outside of the lipo but th...

Made a quick test today, just one stright road and two accelerations. But it behaved ok (just need to add 3 extra wires for measuring 2,3,4 bricks first cells, right now these showed lower than the rest). So 102,25 Voltage with 615,38 Ampers will do 62922,605 Watts from the battery, biggest amount I...

Pack has now sat on balance voltages for a month. in 23th of april voltages were min: 3,830 and max: 3,836 so difference 6mV now today 24th of may there was min: 3,820 and max 3,826 difference still 6mV But discharge was 0,01V or 10mV in 30 days. And this was bms that was taking this :) So we can sa...

Hey I do not like your tone :) but i have searched and here are my answers. I got license from this email <sh***ker@borgwarner.com> last time but in 2016 got it from here <****.conboy@sevcon.com> They each time asked from i have bought it and to what company i have bought it to also. I bought my IXX...

I'm not intending to upgrade my software because there is no need doing that.
they, is some guy in sevcon as i wrote email to my reseller when it first expired and they forwaded me to sevcon.

PS! i have replaced my laptop once in these years and they gave me license to the new laptop also.

I bought my IXXAT in 2015. And had to renew each year. As have not used it from 2018 i need to renew it again to be able to program some parameters in my kart. For the renew they did not charge any money but it's inconvient for me. And for a 600€ USB IXXAT device with a license I assumed I will get ...

I do plan to charge when arriving on track. As i also have lifepo4 packs then i can charge them previous evening. And then use my 3kw elcon charger to charge lipo on racing track. As i have already balnced them and have zeva bms units inside pack i can easyli charge them all to 4,15v (this is my bal...

Did a first charge and discharge test yesterday. H8lBknp5E84 It seems i need to charge them again to 4,15V and then use my iCharger 4010 Duo to top balance each parallel 7s group to 4,2v. When I thought it in my mind it did not looked so messy with the balance leads :) Only reason I have built it wi...

Weighted how heavy is battery box without batteries Also did first voltage test with 4pcs of 7s bricks in series.
https://www.youtube.com/watch?v=rNIpTjdEGmw

Some progress

Making of harness: Harness done and final weight:

Now two output 350A andersons are done.
Also zeva bms is in place and wired also dc/dc.
Olimex and LCD is still to be added.
And then I need to do all XT90 wires from bricks.

For bigger 40Ah and 4kwh battery i do not have separate thread (I have in this thread some pictures). But for 25Ah and 2,5kwh battery i have a separate build thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=85912 There is also two youtube videos about these battery-s. Bigger and smalle...