Search found 1042 matches

by Gregory
Oct 27 2018 7:48am
Forum: Battery Technology
Topic: Want to assemble my own 12v 5A BMS. Need schematic
Replies: 2
Views: 146

Re: Want to assemble my own 12v 5A BMS. Need schematic

The data sheets / app notes for BMS IC's from the big players like TI or LT have some good example circuits that would provide a good starting point. Plus a ton of other info.
by Gregory
Sep 26 2018 5:00am
Forum: General Discussion
Topic: Can I use 18ga silicone wire as an 120volt AC extension cord?
Replies: 33
Views: 1455

Re: Can I use 18ga silicone wire as an 120volt AC extension cord?

If you NEED a laptop have you considered extending the DC cable side of your laptop charger brick? And charge the phone from the laptop.


For Nepal I made a light socket to phone charger unit (screw in USB charger) as they rarely had wall sockets in the mountains. Only worked 50% of the time.
by Gregory
Mar 16 2018 5:46am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5388
Views: 359277

Re: new eZip motor

latecurtis wrote:
Mar 15 2018 10:33pm


I really hate people. Killing someone with my bare hands sounds like fun.
You are sick. Someone should report you to the police for a mandatory mental evaluation.
by Gregory
Feb 11 2018 10:22pm
Forum: Motor Technology
Topic: 2 controllers in paralell for one hub motor, is it possible?
Replies: 31
Views: 1794

Re: 2 controllers in paralell for one hub motor, is it possible?

Samd was posting that he'd had some successes using two controllers a couple of years ago, but no follow up on actual road use and longevity. Personally I'd just get a bigger controller. :D

https://endless-sphere.com/forums/viewt ... =2&t=75186

by Gregory
Feb 11 2018 10:08pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Making a carbon fiber swingarm
Replies: 4
Views: 1052

Re: Making a carbon fiber swingarm

I assume it to be annodised Al.
by Gregory
Jan 28 2018 8:41pm
Forum: E-Bike Technical
Topic: 96V Charger in Australia
Replies: 3
Views: 353

Re: 96V Charger in Australia

120v DC boost converter?

https://www.ebay.com.au/itm/Digital-LED ... SwokJaVI9s

Or two meanwell 48v supplies in series and turned up to 54v each?
by Gregory
Dec 19 2017 10:28pm
Forum: E-Vehicles General Discussion
Topic: I may be building an electric go-kart
Replies: 11
Views: 992

Re: I may be building an electric go-kart

No you don't add the Ah with the cells in series, only if you parallel 6 batteries would you get a 12v battery of 240 Ah capable of 720 A.
by Gregory
Dec 19 2017 5:58pm
Forum: Motor Technology
Topic: MOSFETs near their voltage limit
Replies: 4
Views: 448

Re: MOSFETs near their voltage limit

As an amateur I use 20% for MOSFETs and 50% for caps.
by Gregory
Dec 18 2017 8:15pm
Forum: E-Vehicles General Discussion
Topic: I may be building an electric go-kart
Replies: 11
Views: 992

Re: I may be building an electric go-kart

Love the idea of a go kart. I can't speak to gear ratios. Those prismatic batteries are only good for 3 or 4C continuous discharge. So maybe 150A tops continuous. Which may be OK for your plans. I think they would get hammered on a race track. Any higher and you could be replacing them every season ...
by Gregory
May 18 2017 4:31am
Forum: General Discussion
Topic: Legends dropping like flies
Replies: 227
Views: 26820

Re: Legends dropping like flies

Chris Cornell from Soundgarden & Audioslave found dead. No other details yet.
by Gregory
Apr 26 2017 8:08am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Repairing controller 2v problem
Replies: 7
Views: 636

Re: Repairing controller 2v problem

The first thing I'd check is the battery in my multimeter.

Then find the 5V voltage regulator on the board, probably a tiny sot23 SMD part (or maybe a TO220 like a MOSFET) . It will be connected in line with/close to the main power in.
by Gregory
Apr 16 2017 8:59pm
Forum: E-Bike Technical
Topic: 72V (20S) to 5V switching power supply?
Replies: 5
Views: 335

Re: 72V (20S) to 5V switching power supply?

Many ac/dc wall wart style phone chargers work fine on higher dc voltages. Have you considered those?
by Gregory
Apr 12 2017 4:22am
Forum: E-Bike General Discussion
Topic: How can I discharge a battery to certain voltage?
Replies: 4
Views: 385

Re: How can I discharge a battery to certain voltage?

Battery medic will discharge cells down slowly.

Or CellLog 8M has an output for an alarm that can be modified to trip a discharge like a bank of globes. Will stop when the lowest cell hits the trigger point.
by Gregory
Apr 08 2017 10:43pm
Forum: Stand-up E-scooters and E-skateboards
Topic: longer battery wires or longer motor wires
Replies: 16
Views: 1766

Re: longer battery wires or longer motor wires

And this is a post responding to John that illustrates it well.
by Gregory
Apr 08 2017 10:24pm
Forum: Stand-up E-scooters and E-skateboards
Topic: longer battery wires or longer motor wires
Replies: 16
Views: 1766

Re: longer battery wires or longer motor wires

I read years ago that battery wires should be short. And I've tried to stick to that in my builds, but within reason. Quality capacitors on the battery wires deal with the majority of issues caused by the inductance. Shortening the battery wire by 2cm on a skate board probably won't have any appreci...
by Gregory
Mar 10 2017 11:37pm
Forum: Battery Technology
Topic: LifePo4 voltagedrop, is this normal?
Replies: 15
Views: 1030

Re: LifePo4 voltagedrop, is this normal?

1. Assuming 16S, turn your charger down to 58.4V if possible, or buy a new charger. Most BMS will balance at 3.65V per cell. 2. 12V sag is excessive. See if one cell voltage is sagging worse than others indicating it is faulty or decrease your current draw. If the battery is made of the worst chines...
by Gregory
Feb 20 2017 4:36am
Forum: E-Bike Technical
Topic: Can someone tell me which ebike this is?
Replies: 10
Views: 672

Re: Can someone tell me which ebike this is?

Looks like a geared bafang hub motor. Almost certainly 36V. Should have some info stamped on it?
by Gregory
Feb 19 2017 6:37pm
Forum: Battery Technology
Topic: 10Ah IN, 7Ah OUT?
Replies: 17
Views: 875

Re: 10Ah IN, 7Ah OUT?

Yes. Just stick the watt meter in between the battery and charger, and charge it up. No need to guess.
by Gregory
Feb 05 2017 11:29pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5388
Views: 359277

Re: new eZip motor

I'd be looking at at extending a frame longer to make it less prone to wheelies. Then using that extra space to mount the motor and batteries nice and low. Keeps weight low, keeps the belt away from your balls. Weight up high in the triangle seems like a problem. You should have already have read th...
by Gregory
Jan 30 2017 6:01pm
Forum: E-Bike Technical
Topic: Cheap LM2596HV dc-dc converters that BLOW UP
Replies: 7
Views: 727

Re: Cheap LM2596HV dc-dc converters that BLOW UP

Ha , nice fix , bet it tripled the cost of the board!

I'm pretty sure I received one with 50v cap across the input. I threw it in the scrap bin. But they are so irresistibly cheap. :D
by Gregory
Jan 30 2017 4:47am
Forum: E-Vehicles General Discussion
Topic: transformer chargin and why arent the lights flickering?
Replies: 16
Views: 1210

Re: transformer chargin and why arent the lights flickering?

No the US uses 60Hz, but look at a sine wave (AC) and see how it crosses zero twice per period.

Thermal inertia is probably a more correct term.

Don't build this. Buy one or multiple isolated CC/CV 4.2v power supplies.
by Gregory
Jan 30 2017 3:08am
Forum: E-Vehicles General Discussion
Topic: transformer chargin and why arent the lights flickering?
Replies: 16
Views: 1210

Re: transformer chargin and why arent the lights flickering?

Is this an isolated single cell charger to avoid balancing? what are my obstacles in going direct from the 120v ac and stepping down to 4.0 volts at the secondary, rectify, and charge? and do all the cells connected to the secondary in parallel and get balanced. For starters 1. Its a non regulated s...
by Gregory
Jan 19 2017 6:38am
Forum: E-Bike Technical
Topic: Removing lvc on 48v controller.
Replies: 18
Views: 1511

Re: Removing lvc on 48v controller.

:D Sorry I can't help either.

If you're still open to advice, I'd stop focusing on changing the LVC and check the current the motor is pulling at no load. And what the voltage sags to.
by Gregory
Jan 18 2017 5:37am
Forum: E-Bike Technical
Topic: Removing lvc on 48v controller.
Replies: 18
Views: 1511

Re: Removing lvc on 48v controller.

If I understand that correctly, I'd be looking at part of the battery either sagging down below cell level LVC (ie a bad cell) or going into over current protection. If the battery charges to 53V (same as the charger) then surely it's not controller LVC? More details like the battery, what LVC you t...