Search found 1372 matches

by Warren
Jan 13 2021 1:45pm
Forum: Battery Technology
Topic: Imbalance When Empty?
Replies: 14
Views: 289

Re: Imbalance When Empty?

Yes thats how it is, and one more reason could be the BMS. Lets say the BMS does balance the pack at 4.10V with accuracy of 0.01V and then the pack get discharged to the end of the curve, that small difference from the beginning could increase to 0.10V then. Yup. Our 2017 Bolt, like most until half...
by Warren
Jan 13 2021 1:25pm
Forum: Battery Technology
Topic: Imbalance When Empty?
Replies: 14
Views: 289

Re: Imbalance When Empty?

You all may be interested to hear what GM thinks about cell voltage variation. Back in 2017, when the Chevy Bolt came out, their service manual said that all cells in their 96s3p packs, from 4.16V down to 3.28 V, should be within 0.03 V. If any cells fell outside that value, the battery section cont...
by Warren
Jan 11 2021 10:37pm
Forum: E-Bike General Discussion
Topic: RANS recumbent frame kit for Bafang M series mid-drives
Replies: 4
Views: 107

Re: RANS recumbent frame kit for Bafang M series mid-drives

Oh wow. You know, i called that company asking for parts a while back, and they were super friendly and fun to talk to. I'm happy to see they are pioneering still and not stagnating. .. it does look unnecessarily overbuilt and under-suspended. I feel this could be done much better.. it will have a ...
by Warren
Jan 10 2021 10:04pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Nazca Pioneer solar recumbent build
Replies: 21
Views: 791

Re: Nazca Pioneer solar recumbent build

k2orbust wrote:
Jan 09 2021 6:04pm
They say regen saves a ton of brake wear, so that is something we can look forward to.
I have 29K miles on my DD cargo bike. I am still on the original brake pads! The regen drops out below 12 mph, at which point I usually coast ten feet, and then tap the brakes to put my feet down.
by Warren
Jan 07 2021 10:00pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Enclosed motorcycle?
Replies: 10
Views: 444

Re: Enclosed motorcycle?

Not sure what Craig is doing these days. He had a deer headbutt him off that scooter, riding in his cul-de-sac several years ago. The head trauma left him pretty beat up. His sons may be doing something. I know they ride Zeros now. They are friends of Terry Hershner
by Warren
Jan 03 2021 11:24pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Enclosed motorcycle?
Replies: 10
Views: 444

Re: Enclosed motorcycle?

The Swiss Ecomobile has been around for an age: It was replaced a decade ago by the Monotracer, and is now built in the Czech Republic, and called the Monoracer. It is gorgeous, but still crazy expensive. https://www.peravescz.com/electric-version/ https://youtu.be/ARLl_QDXXng?list=PLVvzYlefm5vagxL...
by Warren
Jan 03 2021 11:11pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Nazca Pioneer solar recumbent build
Replies: 21
Views: 791

Re: Nazca Pioneer solar recumbent build

Aha, a mid drive setup with a jack shaft. I was actually suggesting the motor drive the left side of the rear wheel, not through the gears. That way you can run more power without wrecking the bicycle freewheel, and still have regen. That rear swingarm looks long enough that you could mount it belo...
by Warren
Jan 02 2021 6:53pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Nazca Pioneer solar recumbent build
Replies: 21
Views: 791

Re: Nazca Pioneer solar recumbent build

Small DD motors in big wheels are not a good idea. Here is what I have been considering to replace my 350 watt MAC mid-drive, which is down after 30K miles, with a failed freewheel in the planetary gearset. I have a new 559 mm (26") rear wheel with a rim brake compatible rim, and a disc compati...
by Warren
Dec 30 2020 10:29am
Forum: E-Bike Build Threads / Photos & Video
Topic: Nazca Pioneer solar recumbent build
Replies: 21
Views: 791

Re: Nazca Pioneer solar recumbent build

Welcome aboard! Not nearly enough recumbents on here. I will be very interested in seeing your progress.
by Warren
Dec 25 2020 3:29pm
Forum: General Discussion
Topic: The Lost Recumbent
Replies: 9
Views: 519

Re: The Lost Recumbent

The oil embargo launched the rebirth of quite a few open, and enclosed, trikes. I used to have all the articles, books, journals, and periodicals from the 1970's through the early 2000s. I shipped it all off to UC San Diego Engineering School some years ago, I think it was. https://www.delo.si/asset...
by Warren
Dec 23 2020 12:48pm
Forum: General Discussion
Topic: The Lost Recumbent
Replies: 9
Views: 519

Re: The Lost Recumbent

Neuxstone wrote:
Dec 21 2020 2:23pm
This was BEFORE there was any Tadpoles...
First Tadpole or does anybody know of one before that?
There were tadpole trikes, an velomobiles in the mid 1970's.
by Warren
Dec 23 2020 12:44pm
Forum: General Discussion
Topic: The Lost Recumbent
Replies: 9
Views: 519

Re: The Lost Recumbent

Yeah. That was pretty interesting. I fooled with recumbent trikes back in the late 1980s. I had an idea for a lean steer trike, and had some guys in Indianapolis build one from my design for me. It was a real hoot to ride. I decided recumbent trikes were fun, but too low and wide for safety around c...
by Warren
Dec 06 2020 9:44pm
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 157
Views: 30032

Re: Chevy Bolt first drive

Thanks Warren ,.. interesting data. So would you say that regular city & highway driving would return 200Wh/mile ?.....5 miles per kWh. There are folks on the Bolt forum who regularly see that commuting, with little or no use of HVAC. We don't think about efficiency unless we are doing 500 mile...
by Warren
Dec 06 2020 12:06pm
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 157
Views: 30032

Re: Chevy Bolt first drive

Hi Warren,.... very interesting data. I see you used approx 300 W/mile on average Have you any info on energy consumption at various speeds ?, kW , or Wh/mile . Yes. I did most of this drive with the heat set to HI/90 F to get me home well before dark. With just heated seat and steering wheel, on t...
by Warren
Nov 28 2020 4:27pm
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 157
Views: 30032

Re: Chevy Bolt first drive

Just an update on our Bolt. So we are at 34,722 miles. Have only put on 2,428 miles since mid-March. Only grocery curbside pickup, and medical visits. Added a few things to the cargo area for curbside pickup...a cough shield, and a cardboard floor cover. covid shield 1.jpg covid shield 2.jpg Can't w...
by Warren
Nov 28 2020 3:47pm
Forum: E-Bike General Discussion
Topic: Do I need a special machine or tool for this bearing?
Replies: 10
Views: 263

Re: Do I need a special machine or tool for this bearing?

I have also seen tv car mechanics use a freezer as cold shrinks metal and heat expands metal. Freeze the bearing, and slip it in. Still problems, heat the cover plate. But the tolerances and interferance rates arent that precise with hub motors. Wow! Thanks for the flashback. That is what we old ma...
by Warren
Nov 12 2020 1:12pm
Forum: Large EV General Discussion
Topic: Chevy bolt purchase at auction- how to be sure it comes with dc fast charging
Replies: 6
Views: 421

Re: Chevy bolt purchase at auction- how to be sure it comes with dc fast charging

I’m pl the buy a Chevy bolt at a salvage auction. The Chevy site lists dc fast charging as option av on bot trims. How can I be sure the car I bid on has dc fast charging. Sorry to take so long finding your post. If you look at the shot of under the hood. You will see the High Power Distribution Mo...
by Warren
Oct 14 2020 1:26pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

serious_sam wrote:
Oct 14 2020 4:32am
Can you link to the chevybolt.org thread please?
It is not a single thread. This comes up all the time, but here are two fairly long ones.

https://www.chevybolt.org/threads/hyper ... its.30055/

https://www.chevybolt.org/threads/range ... ons.13466/
by Warren
Oct 12 2020 11:52am
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

So I did the calculations. So in theory, and under these conditions, the coasting vehicle is very slightly more efficient. But in real life it probably doesn't make any noticeable difference, and there would be more variation in driving conditions than there would be between the two results. Thanks...
by Warren
Oct 10 2020 12:35pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

Thank you all for responding. The comments, as I expected, have been more helpful already than all the bloviating on the Bolt forum.
by Warren
Oct 09 2020 6:16pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

So the question is "which uses more energy" overall. I suggest moving this topic to a new thead, since it is a slight divergence and not about ebikes. It is a good topic to discuss though. Thank you. You get it. I was hoping to get a short, definitive answer. I am pretty sure I can match ...
by Warren
Oct 08 2020 9:58pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

The Bolt does not use the hydraulic brakes at all in cruise control. Speed is maintained entirely by regen. In normal one pedal driving the Bolt, you never engage the hydraulic brakes. It can regen at over -0.3 G to a stop. Most owners use "hilltop reserve" setting, which charges to ~90% o...
by Warren
Oct 08 2020 2:10pm
Forum: E-Bike Technical
Topic: Analysis of regen on an ebike
Replies: 151
Views: 54262

Re: Analysis of regen on an ebike

I have a question for the experts in this discussion. Over on the chevybolt.org forum, there is an endless discussion about the value of regenerative braking on hills. The test case is an out and back run, including a one mile long mountain descent at the start, and a short loop at the turn around p...