Search found 69 matches

by Okami
May 23 2017 9:06am
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

Good info :)

Shows that compared to other 'zones' most capacity is in ~3.6v region.
by Okami
May 05 2017 12:03pm
Forum: E-Bike Technical
Topic: Custom frame, full suspension cargo bike thread
Replies: 102
Views: 28703

Re: Custom frame, full suspension cargo bike thread

Hi @agniusm , Very nice and somewhat detailed buildlog! I wanted to ask - Could you give out more details about the BMS you use? From which place / source did you get it? Do you know if the manufacturer also makes 10-12S BMS modules with the same screen / software output you have? Seems pretty cool ...
by Okami
Mar 09 2017 3:33am
Forum: Battery Technology
Topic: Time based charging / computer controlled charger?
Replies: 18
Views: 1191

Re: Time based charging / computer controlled charger?

There are scientific experiment on calendar aging in function of State of Charge (also depending on storage temps ans chemistry : https://endless-sphere.com/forums/viewtopic.php?f=14&t=86777 Let's say is best to store a 50% SOC if you were to store at 6 months... The thing that's hard to grasp is, ...
by Okami
Feb 18 2017 8:52am
Forum: Stand-up E-scooters and E-skateboards
Topic: 5" or 6" pneumatic wheels.
Replies: 118
Views: 19531

Re: 5" or 6" pneumatic wheels.

DON'T BUY THESE: DON'T BUY THESE, THEY WILL FALL APART What happened to them? Can't seem to find a post explaining how they failed Which wheels are you talking about Maxid? He's talking about the ''wheelbarrow'' ones seen on the 2nd page of this topic.. I believe the ''center part'' of the hub brok...
by Okami
Feb 14 2017 4:34am
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

Yeah, I usually dont run them down that much! This was more ''for the science'' than for everyday use. Just ppl didnt believe that I should stop discharging below 3.45 no load voltage.. As basically, there is about 100mah left below that anyways per cell, which isnt very useful as it is not ''easly ...
by Okami
Feb 12 2017 12:27pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Is grass a drag?
Replies: 16
Views: 1967

Re: Is grass a drag?

Check ''wacky boards'' website.. just search on google for it.. Im sure you will find lots of crazy ideas to properl your imagination further..
by Okami
Feb 12 2017 12:24pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC
Replies: 5
Views: 1514

Re: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC

How do you like riding with bindings? Havent you got a need to ''jump out'' of them yet? I've ran into problems 2 times because of using bindings.. one time I couldnt turn enough and my foot got into the wheel, so that threw the board (me included) forward.. the second time I hit an ice block with a...
by Okami
Feb 08 2017 6:31pm
Forum: Battery Technology
Topic: 2 new HIGH POWER 18650 cells coming soon- Sony and Panasonic
Replies: 27
Views: 6592

Re: 2 new HIGH POWER 18650 cells coming soon- Sony and Panas

Can someone comment on how much that temperature graph is correct? It start to seems like there are cells which does not like cold weather at all.. some report even a 50% decrease in capacity at -10C till -20C temperatures.. (-4F till -14F) From the chart it looks like the VTC's 4 might only lose ab...
by Okami
Feb 07 2017 12:48pm
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

It is a simple ''car esc'' with a fan.. it is designed for 6s lipo, so im not so sure can it take more than that.. I also run sensorless, if that makes any sense and use a brushless motor. - I can set up the cut-off on the esc.. but it is set to something like 3.0v, have not really checked in a whil...
by Okami
Feb 07 2017 12:05pm
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

Yep, I already do have such alarm (without the nice case, though).. Besides - I started ''mapping'' the voltage against AH / distance graph from what you gave me.. Today I had only something like 600mah(150mah per cell) usable below 21.07v (3.51v per cell) I feel that coldness might also affect this...
by Okami
Feb 07 2017 6:46am
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

@DrkAngel thanks for pointing this out! I already saw this graph but had problems inserting it into this thread! Im really happy that you ''confirm'' what I had observed.. It also seems to be correct.. from the numbers you gave me, I should be able to more precisely determine ''how much kilometers''...
by Okami
Feb 07 2017 5:23am
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

Cool, thanks @DrkAngel! I already had this idea in my mind about 'filming'' the charge process, but with your ''methodology'' I should be able to ''stop'' at these set steps, in this way I wouldnt need to stop the video and perhaps get a bit more flexibility / accuracy! So - does this mean - that Ch...
by Okami
Feb 06 2017 6:39pm
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 81
Views: 25431

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

Could somebody to me (as newbie) explain how to ''graph'' the capacity points (''pockets'') for my battery? I've got Sony VTC 4 Cells are: 6 in serial, 4 in parallel configuration (24cells total) [6S4P] .. Details: So far - not fully - depleted battery I've charged till about 1900mah per cell, this...
by Okami
Feb 06 2017 3:47pm
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

Now I sort of understand it better.. high speed or high load does seem logical to cause ''problems''. In simple terms (my understanding) the motion/spinning shaft just cannot keep up with the magnetic force which is making it rotate.. so the force has to ''go elsewhere'' - (heat probably/perhaps?) o...
by Okami
Feb 06 2017 1:38pm
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

What do you call - magnetic fielf slippage? the heat tends to build fast when slippage occurs in the magnetic field to rotor This is something I've never heard of before.. can you tell a bit more about it? The only things I know about overheating the motor.. is that there is a limit on how much heat...
by Okami
Feb 06 2017 4:40am
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

Yes, so I somewhat got your point correctly - it is related with speed and possibly amps, too! (higher voltage, lower amps, for the same power output) I think some of the ''diy'' e-cars uses 100+ volts, high-end motorcycles probably use something way higher but I think some scooters (mopeds) also us...
by Okami
Feb 04 2017 8:45pm
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

huh looks like you've put a lot of work into this! On what motor / controller are you planning to run these 130v? Seems quite high.. deadly fast.. if you ask me :D I think some cars / motorcycles get to run at such voltages.. a moped would be a formula probably haha
by Okami
Feb 04 2017 7:25pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC
Replies: 5
Views: 1514

Re: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC

Oh ok.. I see now the reason behind high gear ratio and low kv motor then ;)

Btw that is one big battery - will u place ''all of it'' in the middle of the board?

Besides - nice DRV chip pic in your profile ;)
by Okami
Feb 03 2017 6:35pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC
Replies: 5
Views: 1514

Re: 1st build - E-MTB | single drive | 6S | APS 6374 | VESC

Looks good. How are these knobby tires? Do they roll nice on pavement/road? Other than that - what battery do you use? Some insight into capacity / discharge rate would be nice :) Looks like it is not from one of the biggest ones out there :) Do you have high gear ratio? It looks like you should get...
by Okami
Jan 11 2017 2:35pm
Forum: Stand-up E-scooters and E-skateboards
Topic: E-MTB with dual 5065 motor???
Replies: 7
Views: 1109

Re: E-MTB with dual 5065 motor???

Cool. In which thread / topic will you post the ''results''?

By the way - did you get them from Banggood? They are super cheap there now.. and there's 149kv and 200kv versions available for the 5065 size.. they come sensored and even has some sort of gear in the kit already.
by Okami
Jan 10 2017 3:45am
Forum: Stand-up E-scooters and E-skateboards
Topic: E-MTB with dual 5065 motor???
Replies: 7
Views: 1109

Re: E-MTB with dual 5065 motor???

Thanks for the answer.. Im asking because there is a really good price for 5065.. The 63'' ones I can get in Eu, cost about 30usd more each. Sorry for being on a budget :D
by Okami
Jan 09 2017 4:30pm
Forum: Stand-up E-scooters and E-skateboards
Topic: E-MTB with dual 5065 motor???
Replies: 7
Views: 1109

Re: E-MTB with dual 5065 motor???

Hey - is there any follow up on this one? I also plan to use (ponder the idea) about using 5065 motors.. ? So how bad are they? I plan to use the 200kv version but there is also 149kv available.. the wheel size is only 6inches, so I hope not to over burden them.. it should be a light commuter board ...
by Okami
Dec 22 2016 5:30am
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

There's no such thing as "too early" when it comes to LION. How else are you going to learn other than to make a few mistakes along the way and of course to read what others did? Yeh, my mistake was to buy some used - overpriced cells when I just could have ordered new and no testing would have bee...
by Okami
Dec 21 2016 10:44am
Forum: EV Business World
Topic: Ideas about opening up an electric bicycle store.
Replies: 37
Views: 5925

Re: Ideas about opening up an electric bicycle store.

Great Discussion! I think the tip - suggestion about how many motorcycle riders do you actually see on the streets are somewhat accurate and should be noted. In this regard some sort of market research to get an approx numbers of bicycle riders (possible ebike users) could be valuable. Also try to d...
by Okami
Dec 21 2016 7:00am
Forum: Battery Technology
Topic: My excellent adventure through some battery builds
Replies: 158
Views: 23882

Re: My excellent adventure through some battery builds

Cool, lots of more info to process now.. :) I tested the cell pack I got - the 4S2P one and it showed that 3650mah were pumpet into the pack, so about 1800mah per cell, just as I ''predicted'' as I also foolishly bought these 2 packs (I got 2 of them) from ebay for about 2 eur per battery, (16batter...