Search found 688 matches

by kdog
Oct 02 2021 6:51am
Forum: Alternative Energy
Topic: Beginners Question
Replies: 2
Views: 435

Re: Beginners Question

25mm2 seems pretty light on for 150amp draw, I think that chart allowed for a 50deg temp rise in the bus bar (was blurry and couldn't read it on my Ph) . A quick Google puts rule of thumb bus bar thickness for copper mm2= A/1.2 So 125mm2 for continuous draw at 150amps. Ie ~12x10mm copper (which seem...
by kdog
Oct 02 2021 5:41am
Forum: Alternative Energy
Topic: Hydrogen storage.....Solid State ??
Replies: 8
Views: 328

Re: Hydrogen storage.....Solid State ??

This:
"Plasma Kinetics employs a layered nanophotonic structure with proprietary shape memory alloy that interacts with light"
My BS radar is dinging off the chart! Light controlled release of H2 (stored at stp) :mrgreen:
by kdog
Aug 15 2021 12:26pm
Forum: EBike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5195
Views: 651282

Re: Adaptto Mini-E/Max-E Owner's Thread

@swe, when your controller cuts out, enter charge mode and check the charge voltage present on the display. When it gets over about 5v the controller thinks you are trying to charge and cuts the throttle. (Rolling whilst turning the bike 'on' prevents this if you need to get home) The culprit is as ...
by kdog
Jun 20 2021 7:15am
Forum: EScooters/EMotorcycles
Topic: Let's hear you vent
Replies: 7
Views: 453

Re: Let's hear you vent

Darsey that sux big time... 7.5kwh, $5000 ouch.
by kdog
Jun 17 2021 12:54am
Forum: EScooters/EMotorcycles
Topic: Battery wiring for 100a trouble..
Replies: 7
Views: 422

Re: Battery wiring for 100a trouble..

What are those circular marks on the tabs? They look like it had some sort of pressure fit contact in the past. Anything over 0.2mm nickel gets hard to spot weld but it can be done, the trouble is even 0.3mm Ni only carries ~2a per 1mm of width. Those tabs look pretty robust so I'd guess they'd hand...
by kdog
May 15 2021 8:30am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1765
Views: 278734

Re: Thread for new battery breakthrough PR releases

GMG and UQld have been getting some promising results with aluminum ion batteries. Good energy density and extremely fast charging times. Apparently they are preparing to go commercial with the first iterations. https://www.forbes.com/sites/michaeltaylor/2021/05/13/ev-range-breakthrough-as-new-alumi...
by kdog
May 15 2021 6:32am
Forum: Battery Technology
Topic: Self-Discharge UPDATE On 30Q 141 Cells
Replies: 84
Views: 4227

Re: Self-Discharge UPDATE On 30Q 141 Cells

I was hoping I'd dodged the 30q internal short issue on my 2kwh pack (21s10p) .... But no. :( . It's ~4yrs old and has had a couple of hundred cycles. A cell group started showing signs of trouble after about 50cycles. initially I thought it might be just variance in the bms (adaptto) but cell group...
by kdog
Apr 26 2021 8:04am
Forum: Bike Mechanical & Structural
Topic: Hub motor not working
Replies: 7
Views: 430

Re: Hub motor not working

You don't need to go looking for it... It's right there at the bottom of the picture. Those burnt winding are the culprit. New motor time :cry:
by kdog
Dec 09 2020 7:54am
Forum: Battery Technology
Topic: Is a little rust normal for nickel strip in salt water
Replies: 12
Views: 807

Re: Is a little rust normal for nickel strip in salt water

I've often had a little rust colour (exactly like in your pic) with pure nickel. I think if you have old gal pipes some dissolved iron precipitates out causing the colour, usually rubs off showing bright nickel inderneatg. The rust you get with nickel plated steel is very obviously part of the metal...
by kdog
Nov 26 2020 5:23am
Forum: Motor Technology
Topic: 3000 watf controller
Replies: 1
Views: 231

Re: 3000 watf controller

Yep you can also use a 10kw controller. The question really is 'how long will my 1500w motor last being driven by a 3kw controller? ' Can't tell you haha! Depends on waay to many factors, but if you install a temp sensor in your motor then you can push it hard and back off if it gets too hot. It's t...
by kdog
Nov 24 2020 8:27am
Forum: Motor Technology
Topic: Again...3T, 4T, 5T, 6T difference
Replies: 57
Views: 2855

Re: Again...3T, 4T, 5T, 6T difference

Whoa chalos back! Had to re read to check the date.
by kdog
Nov 05 2020 6:27am
Forum: EBike Technical
Topic: A2B Metro BMS Replacement options
Replies: 1
Views: 125

Re: A2B Metro BMS Replacement options

Not sure if a2b parts are available in other parts of the world but here (aus) they are long gone. Full functionality requires the proprietary bms. I think the system still works with a simple bms with a 2 wire output (pos + neg only) but you loose battery charge level indicator on the display. I co...
by kdog
Nov 02 2020 4:53am
Forum: Battery Technology
Topic: Cell fuse with battery pack fuse
Replies: 5
Views: 352

Re: Cell fuse with battery pack fuse

Usually not. Fuses take a definite period of time to blow and that is usually a lot longer than the time it takes the bms to die. Just get a bigger bms. Don't know why you have a 100amp CB on a 45a bms, that won't protect bms. If you have a CB rated at the peak load of the bms then maybe it would bu...
by kdog
Oct 30 2020 8:08pm
Forum: Battery Technology
Topic: Battery Design advice sought
Replies: 22
Views: 1320

Re: Battery Design advice sought

Between those stacks I'd be looking at a minimum of 4mm insulation thickness better 5-6mm. Must be fail safe. Must be resistant to pounding and vibration. 3mm plastic board, with softer lining each side like silicon sheet would be good. Fish paper alone is not adequate. Avoid at all cost any sensing...
by kdog
Oct 27 2020 3:45pm
Forum: E-Vehicles General Discussion
Topic: Downsize from 60v to 48 v
Replies: 9
Views: 711

Re: Downsize from 60v to 48 v

The motor doesn't give a rats what voltage of battery is so you're fine there. As mentioned you will need a new controller and any associated equipment that goes with that such as display (unless you can change the LVC of the one you have) I don't know how sophisticted this controller is, some are s...
by kdog
Oct 27 2020 6:04am
Forum: E-Vehicles General Discussion
Topic: Downsize from 60v to 48 v
Replies: 9
Views: 711

Re: Downsize from 60v to 48 v

Why do you want to lower the battery voltage? If it's to get a smaller battery, buy a lower AH version. If it's to lower the top speed, don't drive as fast. I can't think of many good reasons to change the system is such a way, but here are a few draw backs. It will be slower, and sluggish through t...
by kdog
Oct 16 2020 5:41pm
Forum: Battery Technology
Topic: Bad weld from spotwelder
Replies: 6
Views: 323

Re: Bad weld from spotwelder

Have you tried actually spotwelding some nickel?looks like you're just hitting the can there.
by kdog
Oct 16 2020 5:38pm
Forum: Battery Technology
Topic: Bad weld from spotwelder
Replies: 6
Views: 323

Re: Bad weld from spotwelder

Minor variation in electrode pressure or electrode tip shape would be my main guess in that order. My spotwelder is AC so I'm not sure about DC, but welders pay attention to polarity of their workpiece, try swapping tip polarity and see if it reverses. Can't think of anything else ottomh.
by kdog
Oct 16 2020 12:33am
Forum: Large EV General Discussion
Topic: 3.8Mw Electric hypercar
Replies: 18
Views: 1833

Re: 3.8Mw Electric hypercar

Quite the gamble if you drop the $$ on the pre-order. But unless you're into EVs how would you know?
by kdog
Oct 16 2020 12:16am
Forum: Large EV General Discussion
Topic: 3.8Mw Electric hypercar
Replies: 18
Views: 1833

3.8Mw Electric hypercar

What do you think of this? Is this hyperBS or actually possible in a car.....3840kw?
Seems like fantasy but what can $2.4mill get you?
Even at 1000v that's 3840 amps, or 7.7kA at 500v :shock:
https://www.caradvice.com.au/892354/ali ... -hypercar/
by kdog
Oct 08 2020 3:38am
Forum: Motor Technology
Topic: Weird controller behaviour
Replies: 3
Views: 530

Re: Weird controller behaviour

Well done. AFAIK the way the self learning works is the controller puts an ordered firing sequence through the phases then checks the hall response. If it isn't suitable it tries a different phase combo then checks again. Then it runs through the sequence through the halls and sorts the best combo a...
by kdog
Oct 08 2020 12:01am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1765
Views: 278734

Re: Thread for new battery breakthrough PR releases

NAWA are make headlines again... Not sure what happened to the ultracap breakthrough a few years back but this time they state they are ready to commercialise the tech with scalable process. https://newatlas.com/energy/nawa-vertically-aligned-carbon-nanotube-electrode/ Not holding my breath but one ...
by kdog
Oct 06 2020 7:33am
Forum: Motor Technology
Topic: Weird controller behaviour
Replies: 3
Views: 530

Re: Weird controller behaviour

It sounds lime the self learning procedure that the controller is running through. The throttle during this time may be an instruction to reverse the rotation. You need to find out what the condition of the procedure is... Some controllers you just leave for a minute or two but others require a spec...
by kdog
Oct 02 2020 7:54am
Forum: Battery Technology
Topic: Dropped battery, one cell dented. Trying to understand failure mode.
Replies: 3
Views: 263

Re: Dropped battery, one cell dented. Trying to understand failure mode.

The cell group in question acts, electrically speaking, like a single cell. The dented cell is as you state, likely internally shorted and has drained both cells in this group to zero. Both cells in this group are now dead on account of being pulled to 0v. :flame: Do not charge it....this is when th...
by kdog
Sep 30 2020 6:24am
Forum: EScooters/EMotorcycles
Topic: Need help understanding / picking fuse for 24v 250w motor batteries
Replies: 4
Views: 343

Re: Need help understanding / picking fuse for 24v 250w motor batteries

Ill second aussieriders views. Fuses that are only marginally above the controllers rated output get hot, melt stuff and often don't die. They just make trouble. You want it to waltz in a long hill, or sustained high speed. So think double your Max controller output (15a?) as a starting point. Most ...