Search found 411 matches

by mikereidis
Jun 08 2009 8:11pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

I started by the 2 YWs in parallel 5S2P balanced 4.16v. 20.8v ... If not, it means a cell is weak and bringing the group down. The YW BMS does not balance. But AFAIK LiMn don't need to. It seems Fatpacks don't even have a BMS. Cool, yes, as long as the LiMn is in good shape... :) (Unlike many of mi...
by mikereidis
Jun 06 2009 1:12pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

.....Have you seen or heard of a problem that would require such switching, or Note that I rebuild my 4 packs to be only 2 big ones. I only use two BMS now. Each BMS monitor 5S( one)P ( 2 YW cells and 10 K cells as one BIG CELL) I also connected my chargers in parallel to charge each pack at ~4 Amp...
by mikereidis
Jun 06 2009 1:01pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

Hi Mike welcome back 9 is allot to return, think i would split it into two returns. good luck Hi 29a. Heck, I was debating 4 returns vs. 3 returns. Wouldn't even consider 9 in one return. Yeah, I was aware of the cash refund if they aren't stocked. Hadn't thought of return and rebuy to extend warra...
by mikereidis
Jun 05 2009 9:45pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

.... I'm thinking of having 4 yardworks chargers connected more or less permanently to the charging terminals of the batts to allow on bike charging. Mike. Welcome back Mike, Mine are connected permanently but switched on the + side. So if a BMS cuts off, the current won't try to go by it's charger...
by mikereidis
Jun 04 2009 6:41pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

Hey all, long time no post ! :) So did this thread die ? As mentioned in my Arduino Charger/BMS thread I went kinda manic on that project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done either......
by mikereidis
Jun 04 2009 6:31pm
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Hi all, long time no post ! :) I've had a few PMs, so here's my 'update' on this and related projects: I went kinda manic on this project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done either......
by mikereidis
Oct 27 2008 8:53am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

With two diodes for each cell connection, either the balancing resistor board (not shown here) or the voltage sensing resistor divider board will be able to tap micro power from the battery pack, or use a separate battery for battery torture or high accuracy testing. With the diodes and a bit of cod...
by mikereidis
Oct 27 2008 8:32am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

To right of PWM chip are 4 TI 74HCT4351E 8 channel analog/digital mux / demuxes with address latches. Primary purpose is the selection of 2 random differential voltages, or 4 single ended voltages simultaneously. Also usable as generic digital I/O. Chips are optional, can use 0-4 depending on your n...
by mikereidis
Oct 27 2008 7:42am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Board is modular and split into logical/functional/conceptual blocks that could also be cut into physical blocks to make smaller PCBs. This is not just an ebike or BMS project; The board is a generic I/O expansion device for micros and could be used for data acquisition, N-phase motor control, LED s...
by mikereidis
Oct 16 2008 9:25am
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

Status update: - I'm expecting 3 "36v" (actually 33v nominal) refurbished DeWalt packs from Dr Bass soon. They are 2.3 AH each, I guess 123 cells (M1 ?). They are almost exactly the same price per watt hour from the Dr as these YW batts. 3 packs almost (33v, 6.9AH) exactly same price as 2 YW batts. ...
by mikereidis
Oct 16 2008 9:11am
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

Am I correct in thinking the weed whacker is 9 amp so as long as i'm drawing more than that per parallel pack low voltage discharge shouldn't be a problem. The BMS seems designed for 31 amps, so I'd say these cells are good for 30 amps (5C) without immediate damage. It's up to you how much you want...
by mikereidis
Oct 16 2008 8:51am
Forum: E-pic Topics
Topic: Cross-Canada by Ebike
Replies: 615
Views: 96865

Re: Cross-Canada by Ebike

On a different connective note, though, there just seems to be something ironic about a guy with Justin's brain running about town on something with "Big Dummy" emblazoned on the side of it. Now THAT's just funny... :-) :) :) That was my first thought; after I got over the shock of seeing Justin re...
by mikereidis
Oct 16 2008 8:51am
Forum: E-Bike Technical
Topic: Cross-Canada by Ebike
Replies: 606
Views: 122320

Re: Cross-Canada by Ebike

On a different connective note, though, there just seems to be something ironic about a guy with Justin's brain running about town on something with "Big Dummy" emblazoned on the side of it. Now THAT's just funny... :-) :) :) That was my first thought; after I got over the shock of seeing Justin re...
by mikereidis
Oct 15 2008 1:30pm
Forum: E-pic Topics
Topic: Cross-Canada by Ebike
Replies: 615
Views: 96865

Re: Cross-Canada by Ebike

CL, i was able to see your google map of the free charging hubs. i would still like for people to label them 'justin junctions' so that the google search doesn't turn up the other stuff. Yes, maps of charging locations would be very nice, especially when visiting unfamiliar areas. I'm imagining an ...
by mikereidis
Oct 15 2008 1:30pm
Forum: E-Bike Technical
Topic: Cross-Canada by Ebike
Replies: 606
Views: 122320

Re: Cross-Canada by Ebike

CL, i was able to see your google map of the free charging hubs. i would still like for people to label them 'justin junctions' so that the google search doesn't turn up the other stuff. Yes, maps of charging locations would be very nice, especially when visiting unfamiliar areas. I'm imagining an ...
by mikereidis
Oct 15 2008 12:13pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

I stuck a astro lipo blinky between bms and pack using the from cells plug (blue is negative to blinky) and according to the blinky they were already balanced. The same result on another two packs ! Ive only cycled these batts twice using the YW charger but I think they must be self balancing as i ...
by mikereidis
Oct 15 2008 12:04pm
Forum: Battery Technology
Topic: here is some info on 20v yardworks lithium ion
Replies: 412
Views: 48794

Re: here is some info on 20v yardworks lithium ion

ill volunteers my YW battery packs for the bms ur makeing also do u got a setup thats a 5 sell at least me and steveo will test and post results so far for my 3s2p pack it gets about 2.26km per AH at 40a peak avrage is about 10amp draw load is about 26 to 30amps and im doing about 55 km\h on my e s...
by mikereidis
Oct 12 2008 9:45am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

>My design now is one single Arduino board for each 5 cell battery with a "shield" board containing a small handful of components. In 5s4p I'd only need one of these combos. In 10s or 20s I'd need 2 or 4. I've now switched direction on this one particular issue: voltage monitoring and many micros ve...
by mikereidis
Oct 11 2008 9:31am
Forum: EV Business World
Topic: What would you sell?
Replies: 23
Views: 3955

Re: What would you sell?

Right now.. oct 10 2008, i'd go with ezee. The kits are refined enough that you won't spend nearly as much time fixing problems as you will dealing with clyte stuff.. ezee also makes complete bikes. Contact Justin at ebikes.ca if you are really serious about it. I think most of us self builders bal...
by mikereidis
Oct 11 2008 9:23am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Well, I guess the "clicky" part of the design has gone by the wayside, huh, Mike??? I did wonder about durability of the relays if they were to get bounced around. For heaven's sake keep the 'blinky" part, though, purely as a customer satisfaction feature. You know...."hey, man, the lights are all ...
by mikereidis
Oct 11 2008 9:08am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Well gee, looks like there is already an Open Source BMS project underway: FreeBMS: http://groups.google.com/group/freebms/topics How come nobody told me ? :) I imagine this project will take some time to gel, if it ever does, but looks like a good source for info and debate on components and desig...
by mikereidis
Oct 10 2008 10:51am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Well gee, looks like there is already an Open Source BMS project underway: FreeBMS: http://groups.google.com/group/freebms/topics How come nobody told me ? :) I imagine this project will take some time to gel, if it ever does, but looks like a good source for info and debate on components and design...
by mikereidis
Oct 10 2008 8:57am
Forum: EV Business World
Topic: What would you sell?
Replies: 23
Views: 3955

Re: What would you sell?

My idea would be to lease or sell cargo bikes with maintenance contracts to local businesses looking for a green image. Longtails, bakfeits, longjohns and cargo trikes offer lots of room for their advertising space. Companies with large campuses (esp in warmer climates) may be potential customers f...
by mikereidis
Oct 09 2008 10:39am
Forum: Battery Technology
Topic: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter
Replies: 26
Views: 6727

Re: Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

Mechanical relays? That must have sounded amusing... Clearly mechanical relays will not be good for the long haul. High powered optocouplers are fairly expensive, but may be in the same ballpark as a low powered one plus a transistor. I'd recommend using a transistor. I have a BMS made by a anonymo...