Go Back   EcoModder Forum > AltModding > Alternative Transportation
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-22-2018, 09:01 AM   #31 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,218

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 64.33 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,859
Thanked 1,555 Times in 1,058 Posts
Another cool thread. I just replace my bike charger. But first I investigated. The insides were mostly greek to me. I want to learn though. I'd also love to learn how to safetly adjust voltage. I have a 12s lithium battery. Most of the cheaper chargers are about 1.5 volts below what I need because they are for 10s lithium.

__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-22-2018, 10:42 AM   #32 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Quote:
Originally Posted by California98Civic View Post
Another cool thread. I just replace my bike charger. But first I investigated. The insides were mostly greek to me. I want to learn though. I'd also love to learn how to safetly adjust voltage. I have a 12s lithium battery. Most of the cheaper chargers are about 1.5 volts below what I need because they are for 10s lithium.
Look for a mini "pot" (potentiometer, in other words a variable resistor), usually near the output wires. Turn it one way or the other with a small screwdriver. Look like this, though maybe only 1/4" or smaller across:



You might "cook" the charger like I did, mind you, as you can probably expect a lithium battery to suck down the amps faster than a cheap lead-acid charger will want to put out. Might not too. Should be OK with one meant for lithium.

You can probably get away with one made for slightly higher voltage, seeing as your BMS should determine when it's time to cut off the power. (Err...do this at your own risk, mind you!)

Never mind on most of that; found your thread again!

Last edited by Stubby79; 02-22-2018 at 02:29 PM..
  Reply With Quote
The Following User Says Thank You to Stubby79 For This Useful Post:
California98Civic (02-27-2018)
Old 02-22-2018, 02:43 PM   #33 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
My luck...not only has it been too cold to ride, it dang well snowed!

It never snows here. Ok, rarely. We get a couple of inches once or twice a year. Usually by this late in February, it's 10 above or more and all the trees are in full bloom.

If this is what mother nature is going to do when I get an eco-friendly ride, maybe I need to go dance naked around a tire fire to offset it!
  Reply With Quote
Old 02-22-2018, 03:37 PM   #34 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Oh, hey...it looks like I never continued my story from the first post. Ha! Only took a couple of years to notice.

About to and a half years back, I bought another fixer-upper ebike. Bit better quality than the ones I originally had. Bigger batteries, more power. As she was when I picked her up:



Dead batteries, flat rear tire, plus a year or more weathering to undo, which meant taking apart all the switches and cleaning the contacts as well as cleaning and removing rust. She's been a faithful ride ever since.



And here's trouble brewing:



This is the "bike" I was referring to "still riding around" in earlier posts. It ran well with my LiFePO4 pack for a while, but I lost another cell or two, and it got shelved, as I was out of replacements. Expensive learning experience! I've recently(if 3 months ago is recent) built it a brick of healthy used lithium batteries. For now I'm still using their original BMSs and charging each of the 5 packs off its own charger, as I trust their BMSs.

Brick:



Plenty of room where the big old 20ah SLA's were: (Still room for one more of the packs it's built from)



I also "upgraded" the controller. Somewhat unnecessarily. I was trying to give the "bike" regen braking. Turns out that "EBS" (electronic assist braking) is not the same as regen braking. In fact, I have no idea what it is because it doesn't seem to make a difference.

I did get more power out of it - it's a 40 amp controller vs maybe 27...? - so it has a lot more gusto. The controller is also rated up to 64v...which is good, since the nominal voltage of my pack is 55 and the full-charge voltage is 63. (which is what the capacitors inside it are rated for, so no going higher yet).

I still need to test the actual capacity of said brick, but expect to have 1.25kwh based on the tests already done on some of the cells. Maybe that will be a project for tomorrow...
Attached Thumbnails
Click image for larger version

Name:	kaishan 500w.jpg
Views:	73
Size:	57.2 KB
ID:	23579   Click image for larger version

Name:	Scooter00001.jpg
Views:	73
Size:	96.8 KB
ID:	23580   Click image for larger version

Name:	Scooter00008.jpg
Views:	74
Size:	99.0 KB
ID:	23581   Click image for larger version

Name:	IMG_3153.JPG
Views:	74
Size:	130.2 KB
ID:	23582   Click image for larger version

Name:	IMG_3152.JPG
Views:	74
Size:	96.9 KB
ID:	23583  

  Reply With Quote
Old 02-24-2018, 02:49 PM   #35 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,618
Thanks: 264
Thanked 274 Times in 231 Posts
Regenerative braking is when the motor is used as a generator to charge the battery. Dynamic braking is when the armature terminals are connected so the motion creates a current and magnetic field that works against the magnetic field from the field coils. It does not lock the wheel.
  Reply With Quote
Old 02-24-2018, 11:29 PM   #36 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Quote:
Originally Posted by Grant-53 View Post
Regenerative braking is when the motor is used as a generator to charge the battery. Dynamic braking is when the armature terminals are connected so the motion creates a current and magnetic field that works against the magnetic field from the field coils. It does not lock the wheel.
And EBS is neither!
  Reply With Quote
Old 02-25-2018, 12:10 AM   #37 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Continuing my current obsession with lithium-ion batteries, I wanted to know more specifically what kind of capacity I would get out of my "bricks" in my electric scooter "bike"...

Finding a test load was a bit of an annoyance. At least one with any significant current draw. I started with an inverter to run something on AC, but the low voltage shut-off on it kicked in half way through. So I boosted the output, but that was a PITA and flaky. I needed something simple and reliable. And I had a box full of incandescent 12v bulbs from switching over a few cars to LEDs, so this was my setup:



I remembered making something similar as a kid for much smaller bulbs. Nothing to it but a 1x4 with 5/8" holes and two pieces of aluminum foil:



Good for burning off 10 amps! (and doesn't care if the voltage drops, either)

So far, I've been getting a good 21AH out of each of the smaller bricks that makes the bigger brick:



That's actual, usable amp-hours, under load and going through the BMS for both charging cut-off and low-voltage discharge cut-off. Cells settled around 4.15v after charging (a touch low), and low voltage cutoff was a hair below 3v.

Temperature makes a fair bit of difference too, according to the data sheet for the cells. And its fairly chill in my work shop.

I'm fairly pleased with the results. 21ah under a decent load totally blows away lead-acid, and the battery weighs 1/3rd as much.
Attached Thumbnails
Click image for larger version

Name:	IMG_3360.JPG
Views:	66
Size:	102.1 KB
ID:	23591   Click image for larger version

Name:	IMG_3359.JPG
Views:	65
Size:	74.0 KB
ID:	23592   Click image for larger version

Name:	IMG_33621.JPG
Views:	67
Size:	115.9 KB
ID:	23593  
  Reply With Quote
Old 02-25-2018, 07:29 AM   #38 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Do I want more lithium batteries?

No, nevermind...that's a given!

Do I need more? That's the real question.

I haven't even settled on what to do with some of the ones I have!
  Reply With Quote
Old 02-26-2018, 02:50 PM   #39 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Took the hybrid for a real ride today. (It was decently above freezing at last)



18km!

Ok, that might not sound like much compared to people who are used to it, but it's probably twice what I could do without assistance. And I probably would have ruptured something trying!

Batteries were at 28.3v (I used 2 bars, so about 25%) and 27.1v (it had 2 bars left at one point).

Don't know how accurate that LED display is, since when I turned it off or switched to the other battery, it showed full or almost full again. The same battery that was showing only 2 before was showing only 2 used when I got home...

But rough estimate based on voltage...the first used about 15% and the second used 50% of capacity(those numbers could be out to lunch since I am looking at a generic voltage vs capacity chart). 65% of 9ah, 152 watt-hours, ~8.5 wh/km.



I won't know without using my AH meter to check how much it take to recharge the batteries (too late, this round), but that should be in ball park range. That's right around 1/3rd what my all-electric powered electric scooter/bike runs at.

The real point though is that I got an hour of decent exercise without killing myself, and felt productive doing so. This should make for a pleasant pass-time in the spring and summer!

PS: I just realized that's farther than I "commute" to work!

PPS: Theoretical range of 55km between both batteries.
Attached Thumbnails
Click image for larger version

Name:	Hybrid Ride Feb 26 2018.jpg
Views:	61
Size:	85.0 KB
ID:	23608  
  Reply With Quote
Old 02-27-2018, 10:10 AM   #40 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,271

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 42
Thanked 369 Times in 277 Posts
Stiff an sore!

Everywhere but my legs!?

  Reply With Quote
Reply  Post New Thread


Tags
e-bike, electric bike, electric scooter

Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com