Search found 9650 matches

by Hillhater
Aug 01 2021 10:23pm
Forum: Battery Technology
Topic: 18650 fire!
Replies: 19
Views: 735

Re: 18650 fire!

On the subject of Lithium fires, this happened last week.. One of the latest, a 450 MWh Tesla Utility installation is just being commissioned in Victoria. Unfortunately, during testing, one of the (100+) “Megapacks” caught fire and rapidly spread to another nearby unit. So this is 6 MW of Tesla cell...
by Hillhater
Aug 01 2021 10:12pm
Forum: Battery Technology
Topic: 18650 fire!
Replies: 19
Views: 735

Re: 18650 fire!

....Dousing is good, but ABC/BC dry chemical extinguisher is best first move. @ hillhater, If you have a plastic pail or a fiberglass bathtub I could see a potential problem. Dry chemical does little if anything on a Lipo fire....plenty of Youtubes show that ..Sand may be a better smothering option...
by Hillhater
Aug 01 2021 8:53pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 650
Views: 88888

Re: QS 3000w midmotor

Yes unfortunately there is no less than 14T for the motor shaft with Woodruff key. They could learn from the kart motors.. 8/ 9T on 219 sprocket is common ( though not ideal for wear rate) on motors of 15+kW. Most common fitting is a 20 deg taper shaft with a very small Woodruff key and 12 (?) mm m...
by Hillhater
Aug 01 2021 8:40pm
Forum: EBike Non-hub Motor Drives
Topic: CYC X1 Stealth (NEW)
Replies: 55
Views: 4446

Re: CYC X1 Stealth (NEW)

FYI.....those photos display very slowly...i suspect they are huge file size ?
by Hillhater
Aug 01 2021 8:33pm
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 71
Views: 1087

Re: Specialized Stumpjumper conversion recommendations

Many of the recent and current “mountain bikes” ..off road, downhill, etc etc ..are designed around a “Compact” frame design. Basicly a frame with a short upright seatpost tube. They require a long seat post to achieve “ full leg extension” and are intended for use with the dropper seat posts... but...
by Hillhater
Aug 01 2021 1:31am
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 71
Views: 1087

Re: Specialized Stumpjumper conversion recommendations

It's not seat height off the ground that matters; it's seat height off the pedal. The higher the bottom bracket, the shorter the cranks-- the higher the seat must be to get correct leg extension. Remember, we are taking off road Ebike here, not circus acts or max performance road racing. Seat heigh...
by Hillhater
Jul 31 2021 6:03pm
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 168
Views: 32837

Re: Chevy Bolt first drive

I really hope they are being over cautious and exaggerating the risk !
But even so, nor a good promo for EVs generally. :o
by Hillhater
Jul 29 2021 6:23pm
Forum: Battery Technology
Topic: 18650 fire!
Replies: 19
Views: 735

Re: 18650 fire!

GREAT ADVICE , ONE AND ALL Goofy as the swimming pool picture was, having a smoke detector nearby is a great suggestion.... Yes , and exaggeration to make the point that you need a LOT of water to suppress a Li pack fire. But the principle is the same, instead of the pool you could have a large bin...
by Hillhater
Jul 29 2021 6:04pm
Forum: Bike Mechanical & Structural
Topic: Chain skipping. Could sprocket be worn before chain?
Replies: 14
Views: 288

Re: Chain skipping. Could sprocket be worn before chain?

I didnt notice what this is used with ... just pedal power ?, mid drive ?, hub motor ?...what max power ? Whilst i admire you attention to detail, i doubt a link or two on chain length is the cause of your problem. Do you have another chain to try ?.. or another cassett ? Rather than assuming the pr...
by Hillhater
Jul 28 2021 9:22pm
Forum: Battery Technology
Topic: 18650 vs prismatic - which is safer?
Replies: 30
Views: 641

Re: 18650 vs prismatic - which is safer?

Maybe a lot of salvageable cells in the recycling outlets in the future then ?
by Hillhater
Jul 28 2021 9:14pm
Forum: Large EV General Discussion
Topic: Electric tractor motors
Replies: 16
Views: 292

Re: Electric tractor motors

The tractor needs to weigh more than the load to get traction. Ideally you want your water tank on the tractor. Ideally , maybe....but that is not often practical and not the way farmers have been hauling loads even back with horse and carts. The normal trick is to get weight transfer from the trai...
by Hillhater
Jul 28 2021 8:56pm
Forum: Large EV General Discussion
Topic: Electric tractor motors
Replies: 16
Views: 292

Re: Electric tractor motors

I don't know what the cheapest ideal system is, but I would never consider a hubmotor for this. Well how about 2 hub motors then ?.. vI8lqWLDnWA But this is a more conventional , low cost, electric conversion of a traditional tractor... yDgYeF2c9_I Youtube has loads of similar low cost conversions.
by Hillhater
Jul 27 2021 7:20pm
Forum: Battery Technology
Topic: 18650 vs prismatic - which is safer?
Replies: 30
Views: 641

Re: 18650 vs prismatic - which is safer?

I guess GM/LG have a good idea of the exact problem with those Bolt packs, but i have not seen a detailed explanation . Is there any other detailed reports to identify potential causes. ? Remember the fires with the Boeing 777 YUSA lithium prismatic packs, and the detailed investigations there..? Ch...
by Hillhater
Jul 27 2021 6:40am
Forum: Large EV General Discussion
Topic: Electric tractor motors
Replies: 16
Views: 292

Re: Electric tractor motors

Small Electric tractors are available..
https://solectrac.com/eutility-electric-tractor
by Hillhater
Jul 26 2021 9:41pm
Forum: Large EV General Discussion
Topic: Electric tractor motors
Replies: 16
Views: 292

Re: Electric tractor motors

You will not find a direct drive hub motor to give you sufficient torque at low speed to haul 2+ tons up a 20 deg slope.
Simplest solution if you really insist to avoid diesel , is to convert an existing small tractor to an electric motor through the existing drive train. ..its not uncommon.!
by Hillhater
Jul 26 2021 2:47am
Forum: Battery Technology
Topic: 18650 fire!
Replies: 19
Views: 735

Re: 18650 fire!

Safe charge and storage facility....with auto extinguisher ! :D :D I have posted this a few times previously, so apologies to those who remember, ..but a useful reminder..! https://imagizer.imageshack.com/img3/9754/lipostore.jpg Packs in a plastic bag ....(with a long charge lead attached if chargin...
by Hillhater
Jul 24 2021 8:46pm
Forum: Large EV General Discussion
Topic: Push / pull kart?
Replies: 11
Views: 247

Re: Push / pull kart?

Not sure yet... but I decided that a dedicated trash hauler just doesn't make sense when there are plenty of other options for hauling them with attachment on lawn mower or golf cart. Well certainly if you already have a mower or golf cart.... ...And the most obvious is a small trailer, ...which wi...
by Hillhater
Jul 23 2021 8:12am
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 71
Views: 1087

Re: Specialized Stumpjumper conversion recommendations

For best bike balance and handling for trails, off roading, and serious downhill, pet the battery in a backpack with a flex connection down to the mid motor.
After 15 mins you will forrget you have a backpack and just enjoy a really light ebike ! :bigthumb:
by Hillhater
Jul 21 2021 9:24pm
Forum: Battery Technology
Topic: 18650 fire!
Replies: 19
Views: 735

Re: 18650 fire!

The lesson is to stick with battery pack vendors who are vetted and demonstrate high quality/attention to detail if you are going to purchase a retail battery pack, even if the costs are higher... Sound advice ...on the surface anyway ! The reality is that even the best pack manufacturers (Tesla, G...
by Hillhater
Jul 21 2021 12:13am
Forum: EBike Non-hub Motor Drives
Topic: help with friction drive vesc config
Replies: 1
Views: 102

Re: help with friction drive vesc config

Asking a question for help is fine...
...but repeating the same post on 6 different threads may just piss people off enough to ignore you !
by Hillhater
Jul 20 2021 6:13pm
Forum: General Discussion
Topic: Sad news; Aussie Jester has passed away
Replies: 6
Views: 221

Re: Sad news; Aussie Jester has passed away

The fingers wrote:
Jul 20 2021 5:54pm
Prayers for his family and friends. The soldering iron is passed. :cry:
In AJ’s case that would have been the MIG welder and the angle grinder also.....his favorite tools ! :D
Sad loss to all his close friends, family , as well as those of us who knew him for his contributions here.
by Hillhater
Jul 20 2021 8:31am
Forum: Large EV General Discussion
Topic: Toyota AWD rear E-drive unit, Q211-2FM
Replies: 3
Views: 205

Re: Toyota AWD rear E-drive unit, Q211-2FM

sleepy_tired wrote:
Jul 19 2021 9:49pm
What sort of controller would you use for something like this?
Dont know exactly, ....but if you are thinking seriously af this..
viewtopic.php?f=9&p=1666741#p1666741
by Hillhater
Jul 19 2021 11:30pm
Forum: General Discussion
Topic: Legends dropping like flies
Replies: 467
Views: 74006

Re: Legends dropping like flies

Thud wrote:
Jul 19 2021 8:34pm
RIP Aussie Jester.
Kim Brent Dybing has laid his burden down.
Oh wow !.. that is sad news.
His posts were so informative and entertaining, one of the real cornerstones of the board in the earlier days.
Didnt even know he was so unwell , but i often wondered why he stopped posting.
by Hillhater
Jul 19 2021 11:18pm
Forum: Battery Technology
Topic: 2/4 Turnigy battery packs suddenly died?
Replies: 11
Views: 260

Re: 2/4 Turnigy battery packs suddenly died?

Even at 4.1v , they would not be fully charged, so probably less than 5Ah available.
If only a 10A average load, you would not even get 30 mins run time before the pack expired .
by Hillhater
Jul 19 2021 11:09pm
Forum: Large EV General Discussion
Topic: Push / pull kart?
Replies: 11
Views: 247

Re: Push / pull kart?

I was actually going to suggest it sounds like an ideal solution would be an used electric golf cart ! :bigthumb: