Search found 87 matches

by ichiban
Jan 02 2019 8:37pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 92213

Re: kWeld - "Next level" DIY battery spot welder

New stuff is in production, I expect to receive that within one or two weeks from now! 8) NZ is possibly, but you'd need to calculate ~40€ for shipping. tatus, I'm thinking about modding the electrodes a little bit. I don't know what exact material the electrode is made out of, can I just bend the ...
by ichiban
Jan 01 2019 9:20am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

You most likely won't be able to do anything with the bottom spacing on the forks steerer as it will affect the crown race/ bearing seating and smooth operation. The steerer bottom end is slightly flared/tapered to enable the crown race to be a very tight fitting to prevent it spinning. I thought m...
by ichiban
Dec 31 2018 12:34pm
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

After test installing my new 14S5P in aluminum tube under bike's downtube (there will be another 14S7P in the triangle), here a problem arises : The clearance between the front wheel and the 14S5P case is about 4.5 cm. But when the front fork hit bumps, it retracts to the shortest of 5.7 cm (per my ...
by ichiban
Dec 31 2018 12:08pm
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

Update Build 14S5P (2018.12.31 going into 2019.01.01) Up to now, this installation is still temporary. I still use rope to fix the pack into position and test ride to see how it feels and how the pack performs. Actual mounting might be 3d printed brackets from my brand-new Creality-10X, it will take...
by ichiban
Dec 30 2018 12:33pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 92213

Re: kWeld - "Next level" DIY battery spot welder

May be it is also like tatus said, the longer the welding cable the higher energy stored in the inductance L and thus it will find a way to keep that current to flow. Resulting in fire back to the mosfets in the circuit for every shot of welding. Premature life of mosfets can be expected. :!:
by ichiban
Dec 30 2018 12:25pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 92213

Re: kWeld - "Next level" DIY battery spot welder

I welded a 300 Cell Pack with the stock cables just fine. You need to have the Welder above the Cells, similar to this: https://endless-sphere.com/forums/download/file.php?id=239781 Thanks for sharing, eee291. Your set-up is a perfect welding station ! Add a pneumatic plunger, it will become a indu...
by ichiban
Dec 30 2018 11:36am
Forum: E-Bike Technical
Topic: Mounting Turnigy Watt Meter
Replies: 175
Views: 36467

Re: Mounting Turnigy Watt Meter

new GT Power R shunt mod 2018.12.30 Here are what I have done to find out where should the problem be at : Both old and new (mod unit) GT Power meters connected in series, measuring the same current flow to the same controller & motor. 1) Check V across R shunt @ remote location : out from BMS & bat...
by ichiban
Dec 30 2018 2:20am
Forum: E-Bike Technical
Topic: Mounting Turnigy Watt Meter
Replies: 175
Views: 36467

Re: Mounting Turnigy Watt Meter

Thanks amberwolf. You are always my guardian angel ! :D :thumb: Unfortunately, I've done some checking to confirm like what you suggested. There's some voltage across R Shunt sense pads up to the meter itself. Everything looks fine but the display still shows 0. I have not tested this GT meter befor...
by ichiban
Dec 30 2018 12:57am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 92213

Re: kWeld - "Next level" DIY battery spot welder

tatus, Please find a way to extend the length of the welding electrode cables since it is hard to weld with stock short cables even with 14S5P I just did. Just like they did in this thread JP spot welder : https://endless-sphere.com/forums/viewtopic.php?p=1434926#p1434684 It will be awesome whenever...
by ichiban
Dec 29 2018 12:46pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1095
Views: 88702

Re: bluetooth BMS?

trazor, I understand how frustrating that might be with all the resources we put into this. I really wanna help but I am very new to this BT BMS thing and still in the learning process. Since the app and the BMS's capability to adjust various parameters, it is quite complicate by the nature of it's ...
by ichiban
Dec 29 2018 12:16pm
Forum: E-Bike Technical
Topic: Mounting Turnigy Watt Meter
Replies: 175
Views: 36467

Re: Mounting Turnigy Watt Meter

I have been using a cheap GT Power watt meter (Turnigy clone) on my handle bar for quite sometime (5-6 months) before I came across this thread. As usual, I ran big wires 4 x 6sq.mm = 2 x forth and 2 back to and from the batt pack and the GT Power and that bothers me everytime I look at it. I unpack...
by ichiban
Dec 24 2018 11:16pm
Forum: E-Bike Technical
Topic: Mounting Turnigy Watt Meter
Replies: 175
Views: 36467

Re: Mounting Turnigy Watt Meter

Anyone still doing this mod now ?
by ichiban
Dec 24 2018 11:10pm
Forum: Battery Technology
Topic: PowerBank Hack ?
Replies: 5
Views: 356

Re: PowerBank Hack ?

I did something similar in the past. It takes a really long time to fully charge but works great. You might try just getting a different power bank board and it might have a lower cutoff. Those things are pretty cheap now. Yes fechter, they are really useful especially on the go. I am thinking abou...
by ichiban
Dec 24 2018 12:27pm
Forum: Battery Technology
Topic: PowerBank Hack ?
Replies: 5
Views: 356

Re: PowerBank Hack ?

Thanks for the reply amberwolf :) I thought people have already gone to celebrate their Christmas. Merry Christmas & Happy New Year to everyone here on ES . :D I will have to check out what you recommend carefully since I believe there will be more of the big powerbanks for me to make. Your method i...
by ichiban
Dec 23 2018 7:59am
Forum: Battery Technology
Topic: PowerBank Hack ?
Replies: 5
Views: 356

PowerBank Hack ?

I recently bought some powerbank cases with charging/discharging circuit included. They are cheap and useful to utilize our spare 18650s. Dual USB 8*18650 Power Bank Battery Box Mobile Phone Charger DIY Shell Case : https://www.aliexpress.com/item/Rovtop-Hot-sale-5V-Dual-USB-8-18650-Power-Bank-Batte...
by ichiban
Dec 15 2018 12:07pm
Forum: Battery Technology
Topic: How does a BMS balance cells ?
Replies: 11
Views: 729

Re: How does a BMS balance cells ?

I'm also dreaming about making an EV from a used car. First, determine the range needed...like 200 km/charge. Assuming avg 125wh/km energy needed for a 4-door sedan - is that a close enough figure ? So I will need 200km x 125wh/km = 25kwh. Spare 10% or so, that it will be 27.5kwh needed. That is app...
by ichiban
Dec 15 2018 11:31am
Forum: Battery Technology
Topic: How does a BMS balance cells ?
Replies: 11
Views: 729

Re: How does a BMS balance cells ?

Thanks amberwolf :D
by ichiban
Dec 15 2018 10:40am
Forum: Battery Technology
Topic: How does a BMS balance cells ?
Replies: 11
Views: 729

Re: How does a BMS balance cells ?

..... The common cheap BMS just resistively drain any cell that goes above a certain voltage (depends on the BMS type, etc), until the cell drops below that setpoint. Usually it also turns off the charge port FETs while it's doing this, and turns them back on once the cell drops far enough. There a...
by ichiban
Dec 11 2018 10:22am
Forum: E-Bike Build Threads / Photos & Video
Topic: 27.5 plus mid drive
Replies: 24
Views: 2762

Re: 27.5 plus mid drive

It is a nice and sturdy battery compartment build ! And what size is your EM3EV battery ? ...S...P ? Have not seen any motor you are using with your kit. Hub or mid-drive ? My 27.5 hardtail does not have a big triangle space like yours, so the 14s7p pack is needed to be squeezed into that tight spac...
by ichiban
Dec 11 2018 10:10am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

The following activity is what I mentioned as "the big riding day". Estimated over half a million bikers joined the event, one of the largest, if not the largest, biking event in the world. Hopefully, it will be held annually. The main biking route pass near my house, so I joined in automatically. :...
by ichiban
Dec 08 2018 10:43am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

My major frustration here is just I needed this charger badly to charge my new 14s5p pack I just finished assembling today for the big riding tomorrow. Lesson learned, I will always need spare charger. :warn:
by ichiban
Dec 08 2018 10:37am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

My concern is whether these cheap $50-$60 chargers will last a good while - just like my late Luna
charger's 6-month life span and just died without any prevalent sign. Actually, I paid around $100.- + shipping for it.

May be I'll buy 2 units and use them alternately to extend their longevity.
by ichiban
Dec 08 2018 10:29am
Forum: Battery Technology
Topic: Large lead acid forklift battery self discharging
Replies: 20
Views: 1032

Re: Large lead acid forklift battery self discharging

As regards the existing Battery. A shorted cell or two is probable. Shorts across the cell is not so likely since there is usually something like a fibreglass mat to keep the two parts of the cell apart. Plate material usually crumbles off of the plate due to miss use and gathers in the bottom of t...
by ichiban
Dec 08 2018 8:02am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 44
Views: 2561

Re: New 14S7P & 14S5P packs need advices (to climb high mountain)

I found some 14s 7A plain cheap chargers : https://www.aliexpress.com/store/product/58-8V-7A-Li-ion-Battery-Charger-Aluminum-Case-For-14S-51-8V-Lipo-LiMn2O4-LiCoO2/1728275_32888961073.html?spm=2114.12010612.8148356.66.6b6c7e935OmuzP and https://www.aliexpress.com/item/58-8V-4-5A-5A-5-5A-6A-6-5A-7A-7...