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by LewTwo
Mar 05 2021 12:41am
Forum: EBike General Discussion
Topic: DC-DC chargers for ebikes?
Replies: 3
Views: 37

Re: DC-DC chargers for ebikes?

72 Volts ( nominal ) so that would be 20S LiCo2 with a charge voltage of 84 volts ( guessing here ). Point is that you are going to have to boost the voltage from your main energy source either way. My guess is it is going to be six for one and half a dozen for the other except the DC-DC route is go...
by LewTwo
Mar 04 2021 9:57am
Forum: EBike Technical
Topic: ISDT Q8 Charger Ballance Leads - Fixed
Replies: 0
Views: 25

ISDT Q8 Charger Ballance Leads - Fixed

ISDT makes some of the few LIPO chargers ( that I have found ) that support up to 8 cells in series. I acquired on of their Q8 models some time ago but have be unable to put it to any use because they use a proprietary 9 pin connector housing specifically designed to stop anyone from inserting a sta...
by LewTwo
Mar 03 2021 5:54am
Forum: EBike Technical
Topic: Trio Cargo e-bike mid drive
Replies: 18
Views: 684

Re: Trio Cargo e-bike mid drive

Another alternative to avoid an external controller is a hub motor that has the controller built in it. The wiring harness has all those extra leads that you dislike but you can 'prune' the ones you do not want.

https://www.goldenmotor.com/ (China)
or
https://www.goldenmotor.ca/ (Canada)
by LewTwo
Mar 02 2021 1:13pm
Forum: EBike General Discussion
Topic: Build pack onto and around frame tube, rather than inside?
Replies: 27
Views: 426

Re: Build pack onto and around frame tube, rather than inside?

Nice. LFP is safe and heavy enough already -- no need to make it worse with a heavy mount. And even 40s would easily clear the crank arms. I am going to take a bit of a closer look. Crank arms are about 7 inches apart. I found a dimensioned drawing of the Headway 40152 and they are actually a bit l...
by LewTwo
Mar 02 2021 4:12am
Forum: EBike General Discussion
Topic: Build pack onto and around frame tube, rather than inside?
Replies: 27
Views: 426

Re: Build pack onto and around frame tube, rather than inside?

LewTwo wrote:
Mar 02 2021 2:51am
H,mmmmm ..... just thinking ....
Three rings of six would be 18S ... leave two out to make room for BMS, switch, etc.
That would cut the length down to 18 inches and be a more common 16S1P=52 volt configuration.
That might actually work for me ....
LiFePO4 Layout 08 (Headway 40152) 00.jpg
LiFePO4 Layout 08 (Headway 40152) 00.jpg (62.59 KiB) Viewed 55 times
by LewTwo
Mar 02 2021 3:11am
Forum: EBike General Discussion
Topic: Build pack onto and around frame tube, rather than inside?
Replies: 27
Views: 426

Re: Build pack onto and around frame tube, rather than inside?

fatty wrote:
Mar 02 2021 3:05am
Yeah, I came up with 11.5kg for maybe 1kWh -- not very compelling, but the screw terminals would make in situ assembly easier. And definitely not stealthy. But as above, 18650s would cut down the bulk quite a bit.
See edit above ... (17 pounds)
by LewTwo
Mar 02 2021 2:51am
Forum: EBike General Discussion
Topic: Build pack onto and around frame tube, rather than inside?
Replies: 27
Views: 426

Re: Build pack onto and around frame tube, rather than inside?

I was also thinking of a series-only 1p24s of Headway 40152s.. Assuming that the down tube was 40mm in diameter then one is looking at four rings of six cells each. That would be 120mm (4-3/4 inches) in diameter by 608mm (24 inches) long with a weight of 11.52Kg (25 pounds). That is minimal without...
by LewTwo
Feb 28 2021 12:43pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 52
Views: 1028

Re: Arduino Nano Cycle Analyst (and other) companion TidBits

While you are considering design features, consider a optional button for throttle 'cruise control' :) Regards to powering the Nano: It sounds as if the Nano's on board 5 volt regulator (5-12 volt DC input) would provide sufficient power. If that be the case considering separating it into to project...
by LewTwo
Feb 28 2021 12:26pm
Forum: EBike Technical
Topic: Protection Diodes
Replies: 3
Views: 112

Re: Protection Diodes

By "cost" do you mean monetary, or electrical? I meant electrical. From what I have been reading it is the Forward Voltage Drop with heat = that multiplied by the current. By in-line I meant literally as cut the cable and solder the diode inline. I am thinking a 5 Amp 100 volt axial Schot...
by LewTwo
Feb 27 2021 8:46pm
Forum: EBike Technical
Topic: Protection Diodes
Replies: 3
Views: 112

Protection Diodes

I am using a Riden RD6006 for a battery charger. FYI: this is a 0-60 volt 0-6 Amp variable power supply. Now because I am old, senile, clumsy and stupid, I might accidentally hook up the battery reversed ( which by the way will blow one of the little SMD 10 amp fuses in the back of the power supply ...
by LewTwo
Feb 27 2021 8:18pm
Forum: Battery Technology
Topic: 18650 battery pack design for a powerbank
Replies: 18
Views: 686

Re: 18650 battery pack design for a powerbank

Just found out one other little fact that they forgot to mention ...
the power supply goes into "Constant Voltage" mode (vs Constant Current).
This is the really important bit .... which begs the question why they left that detail out.
RD6006 CV Mode.JPG
RD6006 CV Mode.JPG (58.08 KiB) Viewed 64 times
by LewTwo
Feb 27 2021 3:22pm
Forum: Battery Technology
Topic: 18650 battery pack design for a powerbank
Replies: 18
Views: 686

Re: 18650 battery pack design for a powerbank

Hi amberwolf, I am using the way you mentioned to charge some of my batteries, and it works for me. Recently, I came across a power supply. It has a charging function/mode which uses a different output connection (green colour one but not the red one). I do not understand why they have to do that. ...
by LewTwo
Feb 27 2021 2:46pm
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

Edit Update: Número tres gotas como una roca. It is already down to 2.6 volts :cry: What about a nominal 48 Volt 15S1P LiFePO4 battery ? I'm sorry to hear you learned a hard lesson about buying used batteries. I don't even sell my used batteries. Too much of a PITA shipping them or worry about what...
by LewTwo
Feb 27 2021 2:36pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 52
Views: 1028

Re: Arduino Nano Cycle Analyst (and other) companion bits and bobs

I have an off-the-wall concept for analog outputs: digital potentiometer
Most of these are resistor ladders with anywhere from 100 to 1024 rungs (pun intended). The current limits are extremely low so one would likely need to feed it to a op-amp or transistor to be useful.
by LewTwo
Feb 26 2021 10:37pm
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

SO I plan to through and charge each cell to 3.50 volts or at least what the power supply thinks is 3.50 volts. There can be a significant difference between the voltage at the power supply terminals and that read across an individual cell .... especially during charging. This picture is the "S...
by LewTwo
Feb 26 2021 7:58pm
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

neptronix wrote:
Feb 26 2021 7:48pm
I'd return it by any means possible if the 4 cells cause the battery to hit LVC very early in real world riding.
Not possible to return it .. at least not legally unless I rent a vehicle and drive to Utah myself.

At this point, the worst case scenario is I salvage the 12 good cells.
by LewTwo
Feb 26 2021 9:18am
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

Well I have upgraded the power supply. The nice thing about the 'Tacklife' PS was that it was simple. This thing is anything but simple.
DSCF7522(600).JPG
DSCF7522(600).JPG (61.93 KiB) Viewed 140 times
DSCF7523.JPG
DSCF7523.JPG (55.84 KiB) Viewed 140 times
by LewTwo
Feb 26 2021 3:01am
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

.... ***It looks like you are numbering your cells from the most positive end of the pack, assuming the red wire on the balance connector is the most positive end...if so, that's backwards from the way I'm used to seeing them counted, so wherever you see me talk about first or last or whatever, I'm...
by LewTwo
Feb 25 2021 7:42pm
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Re: Battery Autopsy

I think we're witnessing the creation of an ebike addict here :lol: LOL --- I built my first E-Bike around 2006. This was the end result (notice the three lead acid batteries). end result.jpg I hit a pothole at speed :oops: Went over the handle bars and made a full face landing. My e-bikes are curr...
by LewTwo
Feb 25 2021 2:14pm
Forum: EBike Build Threads
Topic: Can I and should I do this
Replies: 12
Views: 318

Re: Can I and should I do this

with disc mounts if you must have disc brakes (they don't improve anything except your bike's cleanliness). Not to restart that old argument, but it depends on what you are starting with. Take a spin on an EZIP trails with rim brakes, and you will appreciate disks more. Even perfectly adjusted, tho...
by LewTwo
Feb 25 2021 12:58pm
Forum: EBike Technical
Topic: Battery Autopsy
Replies: 11
Views: 279

Battery Autopsy

Well I was warned ( markz, https://endless-sphere.com/forums/viewtopic.php?t=110214 ) but I did it anyway. I purchased a “Open Box” battery off EBAY. It was an “imotorbattery” branded LiFePO4 48 volt 15 amp hour battery. The Ebay listing indicated that it had been tested. Turns out the vendor ( name...
by LewTwo
Feb 25 2021 7:07am
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 52
Views: 1028

Re: Arduino Nano Cycle Analyst (and other) companion bits and bobs

Do you know the "Forumscontroller" project? It is arduino based and implements PAS and torquesensor processing, current control, various displays are supported and many other features are implemented. It works well with the VESC or any other controller with an analogue voltage throttle in...
by LewTwo
Feb 24 2021 4:56pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 52
Views: 1028

Re: Arduino Nano Cycle Analyst (and other) companion bits and bobs

My favorite shopping places are Amazon and Ebay. Ebay's search engine is pretty good but Amazon's is the absolute worst on the internet. So when I find something 'interesting' on Amazon I tend add it to a shopping list even if I do not currently have a use for it. Try some of these links: https://ww...
by LewTwo
Feb 24 2021 6:09am
Forum: EBike General Discussion
Topic: White Smelly Goop
Replies: 6
Views: 182

Re: White Smelly Goop

I have seem them use it for glueing down all sorts of things from coils to capacitors.
I think sometimes they just use it to cover things up like the part number of an IC.
by LewTwo
Feb 24 2021 5:15am
Forum: EBike General Discussion
Topic: White Smelly Goop
Replies: 6
Views: 182

White Smelly Goop

Where does one get that white smelly goop that our Chinese brethren are so fond of smearing all over electronics ?
Can I just use silicone rtv caulk instead ?

While I am asking stupid questions:
What about 16 pin JST connector (aka balance leads for 16 cell batteries)?