Search found 83 matches

by Okami
Apr 08 2020 2:36pm
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 8
Views: 146

Re: Why Measure Capacity by Discharge and not by Charge?

Yeh, it starts to seem that way. Funny how I relied on such theoretical Wh estimate to calculate range before. It sure is convenient to know batteries WH amount right away than figure out voltage and amp hours for pack versus different voltage pack and its amp hours. Though when charging the charger...
by Okami
Apr 08 2020 12:59pm
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 8
Views: 146

Re: Why Measure Capacity by Discharge and not by Charge?

Well, thinking about consumed energy, im more baffled to which measure I should calculate kilometers per pack. For data monitoring I have G.T. Power Watt meter ------ After a ride I get 7.4 Ah consumed (with 6s li-ion battery) but in terms of Watt Hours, I get 134 Wh consumed. If I multiply 7.4A X 2...
by Okami
Apr 04 2020 3:45am
Forum: Motor Technology
Topic: Rewinding flipsky 80100 motor
Replies: 16
Views: 1218

Re: Rewinding flipsky 80100 motor

Some very good info. Thanks for insights. Also very nice models, clear to see everything. In your opinion, what amperage can these 80 size motors do? Still using 6360-6370 size motors but wondering about amp limits they can do. I know this is purely depending on wiring, copper fill and other factors...
by Okami
Apr 02 2020 11:58am
Forum: Battery Technology
Topic: HUGE EMPTY Downtube/Craddle Battery Box with Keylock
Replies: 28
Views: 4907

Re: HUGE EMPTY Downtube/Craddle Battery Box with Keylock

Nice topic considering downtube cases.

Im facing similar dilemma now. Want something which holds about 60cells and is removable.

Your info u posted definately helped just not sure im ready to pay that sum for a case but it made me to look in the right direction.
by Okami
Mar 25 2020 12:31am
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 99
Views: 29071

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

I've read batteries on sattelites are kept at around 3.9v.

It was said that this voltage is not too high and not too low.

Not sure to what chemistry batteries it was referred though.

More like li-ion variety for sure, not sure about its chemical structure

Sent from my ALE-L21 using Tapatalk

by Okami
Mar 09 2020 1:46pm
Forum: Motor Technology
Topic: What precharge system does Sevcon use?
Replies: 4
Views: 180

Re: What precharge system does Sevcon use?

Sounds good. Relay system would be great indeed.
by Okami
Mar 09 2020 11:34am
Forum: Motor Technology
Topic: What precharge system does Sevcon use?
Replies: 4
Views: 180

Re: What precharge system does Sevcon use?

So do u want to "repair" existing controller or "borrow the idea" and use the relay for different controller?



Sent from my ALE-L21 using Tapatalk

by Okami
Mar 07 2020 12:16pm
Forum: Motor Technology
Topic: Does adding more cap to the DC bus on a controller help? Look in here for the answer.
Replies: 10
Views: 527

Re: Does adding more cap to the DC bus on a controller help? Look in here for the answer.

Thanks for clarifying. Yes, im pretty much noob about custom made brushless motor speed ontrollers but Shaman was the guy which made it more understandable for the common guy. Kudos to him for that. So seems like if developer is keen enough and spends his time to calculate components with the right ...
by Okami
Mar 07 2020 11:41am
Forum: Motor Technology
Topic: Does adding more cap to the DC bus on a controller help? Look in here for the answer.
Replies: 10
Views: 527

Re: Does adding more cap to the DC bus on a controller help? Look in here for the answer.

So is it possible to make your own snubbers or they have to be embedded on the pcb itself? Ive heard a few things about them but not much on how to make one, if the speed controller pcb design does not have it. Seems like major safety improvement, which has not been widely enough executed, at least ...
by Okami
Feb 19 2020 2:53am
Forum: Motor Technology
Topic: Mid-drive motors of 250W compared from a mechanical viewpoint
Replies: 1
Views: 474

Re: Mid-drive motors of 250W compared from a mechanical viewpoint

Well, it would be great to see their real performance vs weight and so on.

But as mentioned, if these are 250W versions their power is software limited, so not always possible to bypass this limitation.

Sent from my ALE-L21 using Tapatalk

by Okami
Feb 17 2020 3:22pm
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2100

Re: DIY Motor Dyno/load?

Nice to see some progress on dyno. I suppose with golden motor ones u mean these ones right: https://www.goldenmotor.com/frame-bldcmotor.htm They do seem fine, though I might look into some non branded ones as I think Golden Motors are putting some margin on them. Seems like gocarts are using them, ...
by Okami
Jan 08 2020 2:32pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 448
Views: 54308

Re: BOSS LEVEL CUSTOM SPOT WELDER

Ok, long story short - I thought my welder went dead when actually it was wire coming loose off the Lipo cell Tab. Due to difficulty soldering the wire back to lipo (because of going from 4s to 3s lipo), the new solder connection didnt stick very well and started coming off. I did think for a few mo...
by Okami
Nov 16 2019 2:34pm
Forum: Battery Technology
Topic: Generic-Chinese-Bluetooth-BMS-communication-protocol
Replies: 35
Views: 9490

Re: Generic-Chinese-Bluetooth-BMS-communication-protocol

A very nice surprise !!! Thank you very much bres55 for this Arduino sketch to read Chinese BMS :D Starting from your sketch for Mega or Uno, I made a version for an ESP8266 variant. The one I used is a ESP8266 DSTIKE DEAUTHER (+-13Euro) board with onboard OLED & Wifi. Possibilities are endless now...
by Okami
Nov 16 2019 2:00pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1332
Views: 162693

Re: bluetooth BMS?

Hi, newbie to bluetooth bms and still havent read whole discussion, but: Has anyone come up with a way to increase range for the bluetooth? I tried to mount this bluetooth on multi rotor drone, to properly see voltage levels, but the 'reception' is so bad, that the connection gets broken apart after...
by Okami
Sep 13 2019 10:02am
Forum: Items for Sale - Used
Topic: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4
Replies: 13
Views: 1217

Re: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4

Yep, those look nice. Did u buy them seperately or they came in larger pack?
by Okami
Sep 07 2019 8:20am
Forum: Items for Sale - Used
Topic: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4
Replies: 13
Views: 1217

Re: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4

Yes but 4 cells not enough, I guess for 12v operation it would work but I was planning ebike build, would need at least 14, and even then I guess 30ah would have been more desireable
by Okami
Sep 06 2019 12:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: new-old build
Replies: 34
Views: 8533

Re: new-old build

Just wanted to comment on this awesome build! Even though this topic is already quite old, wanted to comment how nice and clean it looks and takes up very little space in the middle section of the bike. Been planning to do one on my own (Rc 'mid drive') and drive the rear wheel on the other side, wh...
by Okami
Sep 06 2019 9:37am
Forum: Items for Sale - Used
Topic: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4
Replies: 13
Views: 1217

Re: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4

So do u still have 4 cells or 4 plates left?
by Okami
Sep 05 2019 3:31am
Forum: Items for Sale - Used
Topic: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4
Replies: 13
Views: 1217

Re: Samsung SDI cell - 22Ah - EU - Austria - LiFePO4

For what power levels are they designed? Can they output 3C (66A) continously?

Some clarification would be nice, a bit tight on budget so these would go as 1p config
by Okami
Aug 29 2019 2:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: Nice 5:1 gearbox
Replies: 42
Views: 11306

Re: Nice 5:1 gearbox

Mh yes, Im still not sure how to mount external / extra sprocket on the rear wheel anyway. The current bicycle has disk brakes (dirt / jump style frame) so I would either need to remove them or somehow make the gear larger while still retaining the brakes probably (unless regen braking would be very...
by Okami
Aug 24 2019 2:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: Nice 5:1 gearbox
Replies: 42
Views: 11306

Re: Nice 5:1 gearbox

So are there any more projects using this 5:1 gearbox? Im also considering using it but what I dislike right now is that it would be placed on top of wheel, most likely. That is because most bike frames dont have enough space between rear wheel and triangle frame and fitting inside triangle seems li...
by Okami
Jul 15 2019 5:22am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Honda MT50 road legal conversion
Replies: 27
Views: 10862

Re: Honda MT50 road legal conversion

Just wanted to drop by to tell this is a very nice conversion. Just read that u spent 2500 hours on this which just seems like a crazy number. Been slowly thinking about a way to make road legal electric moped as well. Havent really looked into what donor bike / moped might be suitable. Seems like g...
by Okami
Jul 13 2019 6:11am
Forum: E-Bike Non-hub Motor Drives
Topic: Electric downhill/freeride bike
Replies: 305
Views: 59814

Re: Electric downhill/freeride bike

Sorry to open up old thread again but I suppose u got the bike running. So what power levels do u see while riding and does each 80 turnigy pump out these 5kw of power? I guess for riding on flats a lot less power is needed,.would say up to 4kw for constant speed? Otherwise your 1+kwh battery would ...
by Okami
Jun 27 2019 5:34am
Forum: E-Bike Non-hub Motor Drives
Topic: Annoy bike friction kit: any one tested?
Replies: 8
Views: 1409

Re: Annoy bike friction kit: any one tested?

Hi, no I didnt buy but I would buy a better kit if i was you. Annoy one doesnt look very well made, in my opinion