Search found 602 matches

by kdog
Jan 12 2020 4:40pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Gazelle Cabby Electric Conversion
Replies: 3
Views: 1905

Re: Gazelle Cabby Electric Conversion

FYI they look like KT parts (not made by gazelle), if you need replacement electricals (controller, display etc) you will probably be able to get them cheap off aliexpress or ebay.
by kdog
Dec 28 2019 3:45pm
Forum: E-Vehicles General Discussion
Topic: Gear Reduction Motor Heating
Replies: 20
Views: 846

Re: Gear Reduction Motor Heating

Ha I knew that was going to trip me up.... Haven't used the simulator for s while....but I have never noticed that option. Thanks for pointing it out. If I plugin enough reduction to keep speed down to 3kph on a small hub it never overheats even on 25deg with zero human power and 100kg. OP should be...
by kdog
Dec 27 2019 9:30pm
Forum: E-Vehicles General Discussion
Topic: Gear Reduction Motor Heating
Replies: 20
Views: 846

Re: Gear Reduction Motor Heating

hey kale A friend of mine built an e-barrow. He used a 250w unite motor (one with a built in 9:1 reduction) then reduced it further 4:1 using chain and sprockets. it was just a brushed motor and he didn't bother even putting a controller on it- just a hefty on/off switch (actually I think it was two...
by kdog
Dec 14 2019 7:08am
Forum: E-Vehicles General Discussion
Topic: smoregrava's Torque Monster Electric Paxster Rebuilt
Replies: 2
Views: 422

Re: smoregrava's Torque Monster Electric Paxster Rebuilt

That's awesome! What are the specs on it? Great video too, loved the time-lapse.
by kdog
Dec 03 2019 8:35pm
Forum: Battery Technology
Topic: Need help constructing a pack
Replies: 6
Views: 450

Re: Need help constructing a pack

That's where the DIY bit comes in... I would build a battery housing to fit your frame first utilising highly sophisticated CAD (cardboard aided design) then fit your battery to the interior of the space you have left. Don't forget to include space for padding, insulation, wires and bms. Don't make ...
by kdog
Nov 12 2019 2:57pm
Forum: Battery Technology
Topic: Vax slimstick battery
Replies: 0
Views: 1245

Vax slimstick battery

Has anyone repacked a vax battery?i just picked up a vax slimstick cheap, I'm thinking of putting some 3.5ah cells in it, replacing the old 2ah ones it currently has. Hoping there are no nasty surprises like the bms locking out when I pull the cells.
by kdog
Nov 12 2019 5:01am
Forum: General Discussion
Topic: Other uses for a spoke
Replies: 5
Views: 972

Re: Other uses for a spoke

Gross! But effective I imagine.
I bent a few around into a carabiner shape using the neck as the catch. Works quite well for light loads ~1-2 kg
Great thread!
by kdog
Nov 07 2019 4:54am
Forum: Battery Technology
Topic: Spot welder
Replies: 7
Views: 548

Re: Spot welder

Or look at the nickel over copper technique. 0.1 of both is easy as pie and gives you .5mm equivalent in nickel alone. I tthinkthe topic is covered in the spot welding copper thread.
by kdog
Nov 05 2019 3:36am
Forum: Alternative Energy
Topic: Stationary Charging a battery
Replies: 3
Views: 624

Re: Stationary Charging a battery

Well to put some positvity into the thread.... I recently did a trip with 120w of (2x60w) panels that you could have put on a bike trailer no problem at all. I was using a lifpo4 4s 30ah battery and charging via a sla solar regulator and with bms. I was able to charge at 5amps and so it was only 6hr...
by kdog
Nov 05 2019 12:52am
Forum: E-Bike Build Threads / Photos & Video
Topic: A2B build
Replies: 84
Views: 7251

Re: A2B build

Hate you add more bad news to your build EG, but I built up that exact frame and can add a few more draw backs. The front forks are shit... They look nice with a low friction coating but are dirt cheap inside with only a spring and no dampening. They are also manufactured with not enough rake so the...
by kdog
Oct 29 2019 11:29pm
Forum: E-Bike General Discussion
Topic: Carbon e-mtb build
Replies: 16
Views: 1041

Re: Carbon e-mtb build

I know XTR is top end and all, but at 5kw through the cranks you are going to wear it out really fast, months maybe. Maybe use slx or xt for lower cost or do a LHS drive...or you can just spend heaps. XTR is gram saving xc gear and will wear quickly. If anything go saint bc weight is of no consequen...
by kdog
Oct 27 2019 2:21am
Forum: Battery Technology
Topic: Is this dangerous to do? Need help
Replies: 15
Views: 996

Re: Is this dangerous to do? Need help

Don't do that! Multiple shorts in that proposal. Look at it again and see the many short circuits created, loop after loop. :flame:
by kdog
Oct 25 2019 5:55am
Forum: Motor Technology
Topic: Same debate again, motor windings!
Replies: 12
Views: 1181

Re: Same debate again, motor windings!

I learnt a hell of a lot from that thread.... One of the best here. I was glued to it. Probs 3-4 years ago now . Time flies (with the right winding).
by kdog
Oct 22 2019 5:55am
Forum: Battery Technology
Topic: Aluminum-Air Battery
Replies: 6
Views: 498

Re: Aluminum-Air Battery

Yeah I read an article about it in my news feed recently. Some random guy (possibly with some cred/education behind him) reckons that he's solved the electrolyte problem that has prevented al/air batteries going commercial. Did it in his shed, and it's so harmless you can drink it (the electrolyte) ...
by kdog
Oct 15 2019 3:27am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 229
Views: 44830

Re: Spot Welding Copper Strips to 18650 Battery Cells

Yeh the copper was 0.1mm, haven't tried the test again as I'm not currently building any high power batteries. I've got a feeling that you could use 0.15 without too much trouble cause it's more being fused by the nicked than welded with the amps. @artvk That pack I built is still cranking. I use it...
by kdog
Sep 10 2019 11:11am
Forum: Battery Technology
Topic: Fuse Questions
Replies: 23
Views: 789

Re: Fuse Questions

I've pulled apart lots of ebike batteries that have 'died' where the fuse has been so hot that all the surrounding plastic is heat affected, and the contacts are corroded out but the fuse is still patent. Long periods of just sub critical current. Must have been like a dim little light bulb in there...
by kdog
Sep 09 2019 5:04am
Forum: Battery Technology
Topic: Fuse Questions
Replies: 23
Views: 789

Re: Fuse Questions

And remember, its not the bms's job.
by kdog
Sep 09 2019 5:03am
Forum: Battery Technology
Topic: Fuse Questions
Replies: 23
Views: 789

Re: Fuse Questions

Pretty much any old controller is going to be way more accurate than a fuse. If they go over a predefined limit, then program the controller to limit a little lower. Not too hard to verify this with a big ass shunt popped (poor choice of word) into the battery input even for amp draws in the several...
by kdog
Sep 08 2019 9:23am
Forum: Battery Technology
Topic: Motor Controller cut out during riding
Replies: 16
Views: 596

Re: Motor Controller cut out during riding

Geeze so angry.... Not really warranted. Hard to telling it's bms or controller. Easy way to tell is to bypass bms (take pos and neg directly from the battery) and try. If problem goes away, it's bms, if not, controller. one other thing is to check all connections for corrosion etc esp phase wires.....
by kdog
Sep 08 2019 5:26am
Forum: Battery Technology
Topic: Fuse Questions
Replies: 23
Views: 789

Re: Fuse Questions

It's your controllers job to limit amps, not the bms except in a failure like a downstream short. Then it's faster than a fuse, and re-settable.
by kdog
Sep 07 2019 4:52pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Super fast tommm's bike build.
Replies: 6
Views: 796

Re: 1st Build. Black Enduro 72v 3kw 50-65mph (fast)

Controllers inside cases get hot and die(if thats it there at the top) if you've got the space maybe bolt it on outside for some cooling air flow.
by kdog
Sep 06 2019 6:27pm
Forum: E-Bike Technical
Topic: KT controller MOSFET replacement question
Replies: 5
Views: 402

Re: KT controller MOSFET replacement question

I used these last time: Irbf3307zbf
Good for up to ~60v batteries, if you're only using 10s you might be able to get a better lower voltage choice of mosfet (lower RdS on) for similar price.
by kdog
Sep 06 2019 6:15pm
Forum: E-Bike Technical
Topic: KT controller MOSFET replacement question
Replies: 5
Views: 402

Re: KT controller MOSFET replacement question

You need to match one with the same DS voltage rating, same gate polarity (n-channel), same enhancement mode, same package. Then choose the lowest rds on spec that your willing to pay for (but not higher than the current ones) Sounds like a difficult task but it's not at all. Go to an online seller ...
by kdog
Sep 06 2019 5:11pm
Forum: Battery Technology
Topic: Motor Controller cut out during riding
Replies: 16
Views: 596

Re: Controller cut out when throttling from a dead stop

Not the voltage you are concerned about here, but the amps . What are the amp ratings on both the controller and bms?
by kdog
Sep 03 2019 11:06pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Which is better 48v with bms or 4x 12v with bms each connected in series ?
Replies: 3
Views: 571

Re: Which is better 48v with bms or 4x 12v with bms each connected in series ?

Cheap Chinese bms's are sold by all the various online vendors so there's no way to say 'these ones' are good or not. Try ordering from: https://www.litechpower.com They have a large selection and quality seems to be good in my 2-3 purchases through them. But they are more expensive than say aliexpr...