Search found 110 matches

by hardym
Feb 04 2019 2:11pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1624
Views: 190586

Re: Thread for new battery breakthrough PR releases

New Dual Carbon battery, press release from Power Japan Plus
https://www.iflscience.com/technology/ ... thium-ion/

No real specs yet. Here is a wikipedia explination:

https://en.wikipedia.org/wiki/Dual_carbon_battery
by hardym
Apr 01 2015 10:40am
Forum: Battery Technology
Topic: Some help wiring a 8s bms for a headway pack
Replies: 13
Views: 1503

Re: Some help wiring a 8s bms for a headway pack

ESRGT3
You are close. I think you will find only 8 balancing connectors on the board (see attached figure from eclipse bikes) but
you are showing 9 balance wires on your sketch; The battery - is the one you need to remove. B1 balance wire goes to the plus side of the first cell.
Mark.
by hardym
Jan 31 2015 2:46pm
Forum: Battery Technology
Topic: BMS Schematic help
Replies: 19
Views: 2477

Re: BMS Schematic help

your schematic does not match the parts and circuitry on the D167. It's the best I could do. I think that it's pretty close. If you have more information on the D167 parts that would be great to share. when you say you have disconnected the HVC and the LVC signal lines, what did you do? removing th...
by hardym
Jan 31 2015 11:22am
Forum: Battery Technology
Topic: BMS Schematic help
Replies: 19
Views: 2477

BMS Schematic help

I'm having trouble with a BMS. It seems that many times after hooking up, the BMS seems to be in a "locked up" state, wont charge or discharge. At first I thought that they were DOA, and just broke, but one came back to life. I'd like to understand the problem better, so I created a schematic (attac...
by hardym
Jan 14 2015 8:40am
Forum: Battery Technology
Topic: HobbyKing Lipo Battery Pack
Replies: 49
Views: 7072

Re: DIY Battery Pack Question - Connectors, BMS or Alarms

I agree with dogman dan, the way you are proposing connecting the batteries, you'll need a BMS for each string, resulting in a separate monitoring for each cell. The BMS costs for your proposed configuration will be far more than the connectors. If you paralleled the cells first, then applied a BMS ...
by hardym
Jul 17 2014 11:05pm
Forum: Battery Technology
Topic: diy bms
Replies: 13
Views: 1904

Re: diy bms

Well thought out layout. Looks like monitoring and balancing with no LV or HV cutoff?
by hardym
Nov 23 2013 1:56pm
Forum: E-Bike Technical
Topic: EB324 Controllers keep blowing up! Problematic controllers
Replies: 29
Views: 3006

Re: EB324 Controllers keep blowing up! Problematic controlle

I meant the Xie Chang boards have been around for a long time. I've repaired a couple, usually broken due to operation/installation errors.
What kind of large Caps are populated on the new EB324 boards?
Mark.
by hardym
Nov 23 2013 12:01pm
Forum: E-Bike Technical
Topic: EB324 Controllers keep blowing up! Problematic controllers
Replies: 29
Views: 3006

Re: EB324 Controllers keep blowing up! Problematic controlle

I'm no expert here, just I'm intrigued with the problem. These board have been reliable. I suspect there are two potential causes for same FET failure: 1) The high side is driver for this particular FET may incorrectly driving too high a voltage, or triggering accidentally via some interference. Wou...
by hardym
Aug 24 2013 6:57pm
Forum: Battery Technology
Topic: Help BMSNot Working
Replies: 11
Views: 436

Re: Help BMSNot Working

The OZ890 is a programmable CPU that can be accessed via the i2c interface on the board (SDL/SCA/GND) connector. One possibly is that the OZ chip got fried. Heard that can happen just by not sequencing the battery connections correctly. It would take some work, but it may be possible to test communi...
by hardym
Aug 19 2013 7:28am
Forum: Battery Technology
Topic: reducing voltage NOT using a transformer
Replies: 10
Views: 1091

Re: reducing voltage NOT using a transformer

I didn 't see the power requirements, but my guess is the current woudl be about 1 amp. For about the same price as the solutoins above you can use a switching buck converter at much higher efficency. Below is a link to DX, but these modules are commonly available on ebay. http://dx.com/p/dc-4-5-30-...
by hardym
Jun 06 2013 8:19pm
Forum: Battery Technology
Topic: First production fuel cell electric bike
Replies: 6
Views: 1019

First production fuel cell electric bike

Interesting article below about a commercial fuel cell electric bike, available in 2016.

http://www.bike-eu.com/Home/General/201 ... -1269941W/


I'd love to test a prototype battery.
Mark.
by hardym
May 29 2013 7:23pm
Forum: E-Bike Technical
Topic: dx.com cree bike light max voltage ?
Replies: 24
Views: 2345

Re: dx.com cree bike light max voltage ?

Not quite related, but there is a good discussion about using cheap DC-DC ebay converters with cheap Cree lights.
It works pretty well:

http://endless-sphere.com/forums/viewto ... =2&t=46833

Mark.
by hardym
Apr 24 2013 12:20am
Forum: Battery Technology
Topic: Headway batteries advice
Replies: 86
Views: 7761

Re: Headway batteries advice

I've ordered a Headways battery from EV Assemble. Took about 4 weeks to recieve, but I got it, and have gotten some support from the owner, michael who ocassions this board. I only have about 1200 miles but it seems to be working ok. Here are a couple data points: Headways 12 AH 48V with charger and...
by hardym
Jan 13 2013 12:12pm
Forum: E-Bike Technical
Topic: Add a Cree HeadLight to your 48V system
Replies: 13
Views: 1637

Re: Add a Cree HeadLight to your 48V system

The Cree Light and tail light togher draw about 40 ma input and 300 ma Output. Yes, the DC-DC will get warm but not hot. Suggest getting one of the heat-sinked version of the LM2596HV (e.g., link below). You will still be able to heat-shrink this package wiht a 1" tube. http://www.ebay.com/itm/4-5-6...
by hardym
Jan 09 2013 11:21pm
Forum: E-Bike Technical
Topic: Add a Cree HeadLight to your 48V system
Replies: 13
Views: 1637

Re: Add a Cree HeadLight to your 48V system

Thanks, i posted a schematic of the MOSFET switch on the DC-DC converter in the first post, and a picture of the MOSFET soldered and screwed onto the DC-DC converter. I haven't opened the Cree light, but the DC-DC coverter is larger than the light, so I dont suspect it would fit in side. My installa...
by hardym
Jan 09 2013 1:03am
Forum: E-Bike Technical
Topic: Add a Cree HeadLight to your 48V system
Replies: 13
Views: 1637

Add a Cree HeadLight to your 48V system

Here's a way to add cheap, but powerful head and tail light to your 36 or 48 volt system for under $50. Start with this Cree light package from ebay for $30. This is a Super bright light that has more than enuf power for night rides. It Includes a small battery pack that you will not need. http://ww...
by hardym
Dec 29 2012 10:48am
Forum: E-Bike Technical
Topic: determine the correct spoke tension
Replies: 63
Views: 5999

Re: determine the correct spoke tension

I dont have an answer for you, but can share this. I bought a 1000W motor laced to a 26" rim from china with very thick, rugged spokes. Every 6 months or so, the spokes become so loose that they snap and crackle as I ride, so i have to tighten a bit. With only a simple spoke wrench like this (withou...
by hardym
Dec 10 2012 1:28pm
Forum: Battery Technology
Topic: BMS Problem with new battery
Replies: 12
Views: 572

Re: BMS Problem with new battery

I was looking at the Golden Oasis website, and the Battey may be a 20 AH battery, which has a limit of between 40-60 amps. The question is what is your controller current limit? If the controller draws more than 50 or so amps, it would cause the battery to cut off. A 20AH battery putting out 50 Amps...
by hardym
Nov 25 2012 7:35pm
Forum: Battery Technology
Topic: Buying batteries, trusted sellers?
Replies: 12
Views: 978

Re: Buying batteries, trusted sellers?

I'm a big fan of headways packs -- they have the "C" power that cannot be achieved using regular ping pouch type packs, and they have a 12AH cell that you are looking for. I'ts nice to have the extra power when you need it, without doing damage to your pack. Also, I believe that having a single cell...
by hardym
Oct 31 2012 10:32pm
Forum: E-Bike Technical
Topic: What connectors and cables are used in e-bikes
Replies: 21
Views: 7595

Re: What connectors and cables are used in e-bikes

Cheap common connectors:
http://tncscooters.com/index.php?route= ... =69&page=1

The crimpers come in very handy if you are planning to do a couple builds.
Mark.
by hardym
Oct 30 2012 8:13pm
Forum: E-Bike Technical
Topic: Upgrading from 36V to 48V
Replies: 9
Views: 1403

Re: Upgrading from 36V to 48V

It should work. Yes, your controller should have some adjustment to change between 36V and 48V. This may be an internal strap or an external set of wires that needs to be connected or disconnected. The straps/connectors may change both the low voltage cutoff (lvc) and change the internals of the pow...
by hardym
Sep 30 2012 9:52am
Forum: Battery Technology
Topic: arduino based BMS
Replies: 33
Views: 17921

Re: arduino based BMS

An arduino mega 2560 has 16 analog inputs. As was pointed out earlier in the thread, measuring the voltage is complicated, when the cells are stacked in series. In a related thread on ES, S.B.D proposed a voltage monitoring ckt similar to high side current monitors, that allows a common mode voltage...
by hardym
Jun 21 2012 1:38pm
Forum: Battery Technology
Topic: LTC6803 IC
Replies: 15
Views: 4141

Re: LTC6803 IC

Here is some sloppy code that gets the cell voltages from a 6802, using a 18F PIC and CCS compiler, and checks the PEC int read_cv(void) { int cx, x, y; long y1, y2; int data1, data2, data3; int pec; int pec_calc; int error; long tempcellv[12]; int count; error = 0; pull_CSBI_low(); spi_xfer(RDCV); ...
by hardym
Jun 17 2012 11:40pm
Forum: Battery Technology
Topic: Switch between batteries
Replies: 27
Views: 1464

Re: Switch between batteries

I've been working with another ES member on a trike build with dual batteries (separate internal BMS'es), who wanted to switch batteries. Wants to ride 1 battery disance, stop, switch and ride home. The build has 2 48v li batteries with 40A controller. I found this DPDT switch with a "center off" fo...
by hardym
Jun 13 2012 12:35am
Forum: E-Bike Technical
Topic: Sensor or Sensorless Controller...?
Replies: 40
Views: 3039

Re: Sensor of Sensorless Controller...?

You havn't talked about the battery. If you are using a ping type pack, they are limited to about 2C, meaning a 48V 10AH pack should only put out 20A. If that's the case, then get the 25A Controller, which will help protect the Ping battery. If you get a bigger capacity pack, or higher C rating, the...