Search found 558 matches

by kdog
Aug 17 2019 7:05am
Forum: Stand-up E-scooters and E-skateboards
Topic: I’m new , looking for feedback
Replies: 5
Views: 192

Re: I’m new , looking for feedback

AW, you never fail to impress me with your patience. He lost me after his second post, no need for it...
So here's my feedback....
Don't be so rude.
by kdog
Aug 17 2019 5:48am
Forum: E-Vehicles General Discussion
Topic: E Hiking Cart
Replies: 11
Views: 215

Re: E Hiking Cart

A friend of mine built a electric wheel barrow a few years back. He used that motor in your pic (200w with built in 9:1reduction) with a 10t then chain to 50tooth chainring. This chainring was attached to the wheelbarrow wheel (aprox 16") it did about 4kph on 36v.... But could pull whatever he could...
by kdog
Aug 13 2019 3:30pm
Forum: Battery Technology
Topic: Battery match for QS 273 5kw
Replies: 16
Views: 442

Re: Battery match for QS 273 5kw

Excl sanyo...$$$
Excl any cell under 10a Max discharge
Excl any cell under 3000mah
Include any combo that gives : cell cont amps x #P groups = >120amps

Then choose 30q :lol:
by kdog
Aug 11 2019 10:42pm
Forum: E-Bike Technical
Topic: Carbon fiber cranks: made sense in ebikes?
Replies: 6
Views: 241

Re: Carbon fiber cranks: made sense in ebikes?

Will make more room in your shed when your bike is stolen for the cranks :(
by kdog
Aug 11 2019 6:40am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD dies after 10 seconds, again and again.
Replies: 8
Views: 250

Re: BBSHD dies after 10 seconds, again and again.

Can you measure the time interval between turning off's?
Exactly the same would lead me to think controller/software error type of issue, but if it varied I'd say and intermittent fault line sensor wire etc.
by kdog
Aug 08 2019 7:17am
Forum: Battery Technology
Topic: Where can i get such a weldable Blade receptacle
Replies: 7
Views: 215

Re: Where can i get such a weldable Blade receptacle

I wasn't sure what you meant by misused... But yes I agree, not properly designed for that purpose.
by kdog
Aug 07 2019 6:30pm
Forum: Battery Technology
Topic: How many amps for BMS?
Replies: 8
Views: 216

Re: How many amps for BMS?

If you were intending on using that many amps often then yes, but otherwise it's probably overkill. A 225amp bms is going to be large and expensive. Bms's have a Max and continuous rating so get one that gives you ~double your continuous draw, with a peak over 150. 100 amps sounds good- peak is like...
by kdog
Aug 07 2019 3:06am
Forum: Battery Technology
Topic: Where can i get such a weldable Blade receptacle
Replies: 7
Views: 215

Re: Where can i get such a weldable Blade receptacle

DS.. Not sure what you mean by misused.... Doesn't look DIY (maybe it is?)
Not a bad idea for bench top use, but certainly wouldnt use it as part of a pack.
by kdog
Aug 07 2019 12:42am
Forum: Battery Technology
Topic: How many amps for BMS?
Replies: 8
Views: 216

Re: How many amps for BMS?

Also at these draws, pack design is pretty important. You standard 'bit o' nickel' Chinese battery is going to have further issues. Maybe get some assurances on build quality.. Series nickel thickness, current path/sharing, heat shedding, vibration protection are all questions I'd be investigating b...
by kdog
Aug 07 2019 12:11am
Forum: Battery Technology
Topic: How many amps for BMS?
Replies: 8
Views: 216

Re: How many amps for BMS?

If you can I'd go for a bigger capacity bms. 60a cont is only 10amps headroom and its likely to get hot and maybe die. Id say 80-100cont would be better. Max amp draw should be handled by the controller and the bms is there to cut out in case of overload like a short (you can't use your bms to limit...
by kdog
Aug 05 2019 5:02am
Forum: Battery Technology
Topic: 10s charger measures 42.3v. Bad thing?
Replies: 7
Views: 200

Re: 10s charger measures 42.3v. Bad thing?

You might be able to open it up and adjust it down a notch, using the V adj trimpot. How hard that is depends on the type of charger.
by kdog
Jul 22 2019 6:03am
Forum: Battery Technology
Topic: Charging battery faster
Replies: 86
Views: 2057

Re: Charging battery faster

Ah(of battery) divided by amp output of charger (with appropriate voltage ) equals time in hours to charge. Ah/a=t (but in reality it's more bc of the cv phase) Power of charger = v x a... eg. 48v x 5 amp = ~250w Regular charging a 1c is pretty stiff, it will age your batteries faster. 0.3c (3hr cha...
by kdog
Jul 20 2019 6:43am
Forum: Motor Technology
Topic: Combination BB.. - controller with hub motor
Replies: 3
Views: 174

Re: Combination BB.. - controller with hub motor

It might drive a small geared hub motor but I don't think it will like a big dd motor. I'm tipping it will Max out, get hot and die if you try and drive anything big, but I don't really know....bafangs external 500w controllers are pissweak rubbish that's all I'm going on (the one I used for about 3...
by kdog
Jul 14 2019 6:17am
Forum: Battery Technology
Topic: is this an indication of battery overheating
Replies: 11
Views: 327

Re: is this an indication of battery overheating

Usually they're just abrasion marks, not really anything to worry about.... but it's good you're inspecting your pack.
by kdog
Jul 11 2019 3:52am
Forum: Motor Technology
Topic: Low KV 1000W BLDC
Replies: 43
Views: 1219

Re: Low KV 1000W BLDC

What's a dpv? Have you looked at the myriad hub motors out there to see if adaption of these would suit. (without knowing your application, I'm guessing ) The stoke Monkey is already pre-prepared for you.
I'd stay away from revolt... Promised so much but they have a poor history here on ES.
by kdog
Jul 10 2019 4:41am
Forum: E-Bike General Discussion
Topic: My throttle is starting to twitch on it's own
Replies: 8
Views: 297

Re: My throttle is starting to twitch on it's own

A loose throttle magnet will also give erratic outputs.
by kdog
Jul 06 2019 6:10am
Forum: Battery Technology
Topic: Newbie seeking more advice
Replies: 6
Views: 207

Re: Newbie seeking more advice

Check out if the amp limit is written on the bms, itll give you some idea of the systems Max draw.
by kdog
Jul 01 2019 6:26am
Forum: E-Bike General Discussion
Topic: Bolt failure - damage
Replies: 22
Views: 732

Re: Bolt failure - damage

Hi David The bolt looks like a rotor bolt... Usually they are just threaded into the side plate of the motor, ie. into the aluminium around the hub. If it's loose but won't come out, it sounds like the threads are damaged, it might come out with a bit of force. Not too much mind you I could be wrong...
by kdog
Jun 30 2019 12:57am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3636
Views: 230516

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Hi KT gurus Before I destroy another kt controller :( I thought I'd ask first this time!! The output on the controller that is at battery voltage, I'm assuming it is for lights. Is this regulated at all? Am I safe to chuck in any old led (rated for 6-60v) front and rear combo or do I have to worry a...
by kdog
Jun 19 2019 9:32pm
Forum: Motor Technology
Topic: Cyclone 20kW hub motor specs
Replies: 9
Views: 508

Re: Cyclone 20kW hub motor specs

I'm with AW, accidental addition of a zero! Hard to see in the pics and I couldn't find any further info but... given the size of it related to the rotor, and that the phase wires look std at about 10g there NO way, this would do 20kw cont. If it's really well made then I'd say 3 but otherwise maybe...
by kdog
Jun 05 2019 5:56am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 4889
Views: 186956

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Oops I just tipped over a page... No matter :pancake:
by kdog
Jun 05 2019 5:56am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 4889
Views: 186956

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You know this thread is like renewable energy... Its the most rapidly expanding topic here :lol: :lol:
I'm going to go out there and say it...
This thread will NEVER make it to 200 pages by the end of the year.. :wink:
by kdog
Jun 05 2019 2:50am
Forum: Motor Technology
Topic: Need help with this blown KT controller
Replies: 28
Views: 1643

Re: Need help with this blown KT controller

It would be disappointing if this was the case. I would have hoped that the controller would have adequate protection... Other controllers I've had doing exactly the same thing have been fine. I might have to get a better controller. Regen is a good thing around here with the hilly are we live in.
by kdog
Jun 04 2019 8:59pm
Forum: E-Bike General Discussion
Topic: Changing pedal distance on cranks
Replies: 14
Views: 428

Re: Changing pedal distance on cranks

My mate drilled his out no worries for his kid. If there's enough metal where the new thread goes in it'll be fine. That 'too weak' BS is from your lbs not wanting to accept the liability....sure, I wouldn't if you were smashing dh on them...but you're not. My mate had trouble getting the tap to sta...