Bob Hughes on the RC Group forum can make you some custom harnesses, and he can make sure you get some high quality high strand count 22awg wire on them. He comes highly recommended by the folks out there. This is a link to his products website: http://rcsales.shutterfly.com/ , but this would be a custom job I'm sure.momo said:I have been looking for these already made and found nothing. Something with at least 6" leads on the ends.
I ordered these but are too small. http://www.litchfieldstation.com/xcart/product.php?productid=2450061&cat=76&page=1
Cool, I didn't know Dave was offering to make them as well. He sure provides great service with his product line... that's based on my own personal expereince 8)GGoodrum said:These are really hard to find. I'm having Dave, at ProgressiveRC.com, make some for me, which I will include with the CellLog based BMS stuff we are working on.
-- Gary
momo said:Would this work?
http://www.rcaccessory.com/bantame-stationeac131e-stationopenendedwiringharnessforbc-8charger.aspx
scoot said:One reason why I think Gary has moved to another connector type altogether for his celllog based BMS design to handle more currently safely... I forget exactly what it is... micro something
I realize this will be a dumb question, but i have no shame sometimes I suppose that 3 mm pitch is just to much spread to slip directly onto the cellLog pins (2.5mm pitch) right? Your just using the microfit plug to go from your board to the cells and having the celllog plug into a jst connector on the board... more or less plug in once and leave it there right?GGoodrum said:scoot said:One reason why I think Gary has moved to another connector type altogether for his celllog based BMS design to handle more currently safely... I forget exactly what it is... micro something
That is correct. I'm now using Molex MicroFit 3.0mm connectors and 18-gauge wires, not just for extra current carrying capability, but also because there's less resistance in the wires, so less voltage drop for measurements via the CellLogs, and/or the balancers. The other thing I don't like about the JST-XH connectors is that they don't hold up well, if you have to plug and unplug them a lot.
scoot said:I realize this will be a dumb question, but i have no shame sometimes I suppose that 3 mm pitch is just to much spread to slip directly onto the cellLog pins (2.5mm pitch) right? Your just using the microfit plug to go from your board to the cells and having the celllog plug into a jst connector on the board... more or less plug in once and leave it there right?
scoot said:Off topic.. Gary, I too am looking way forward to your 8s boards for my Headway packs. I tried the db8 just for fun, and while it works ok, it does get hot and takes a while ( I have a troublesome cell in one of my packs). the higher current shunting should help a bunch on that pack
Yep JC LOL... you, me and every other person I've read commenting on those pesky little buggers I think I rather went over the top on the matter, but I have to say it has been very reliable thus far. I am looking to simplify it down once I am finished with the final solution 8) , but up till now this approach has provided all of the versatility and reliability I have needed in my recent ES up-bringing Besides I like electrical Legos :lol:jdcburg said:I didn't like plugging and unplugging the JST from the Celllog. It was hard to grip it and I actually bent a pin on my old Celllog. So I joined 2 of the female JST pigtails together using crimp-on buttsplices and put a male x male on the end. That way I can leave one end attached to the Celllog and plug the battery connector into the male end of the pigtail, which I can hold better in my hands. However, as some of you know from another thread, I may have had some trouble with my harness and all those connections may be to blame, so try it at your own risk - jd
GGoodrum said:Yipes! That's one way, I guess.
With pin 1 switched off, the circuit draws about 350-500 uA. Worst case that is .0005A. At that rate, it will take 20,000 hours, or about 2-1/2 years to drain a 10Ah pack.
scoot said:Yep JC LOL... you, me and every other person I've read commenting on those pesky little buggers I think I rather went over the top on the matter, but I have to say it has been very reliable thus far. I am looking to simplify it down once I am finished with the final solution 8) , but up till now this approach has provided all of the versatility and reliability I have needed in my recent ES up-bringing Besides I like electrical Legos :lol:jdcburg said:I didn't like plugging and unplugging the JST from the Celllog. It was hard to grip it and I actually bent a pin on my old Celllog. So I joined 2 of the female JST pigtails together using crimp-on buttsplices and put a male x male on the end. That way I can leave one end attached to the Celllog and plug the battery connector into the male end of the pigtail, which I can hold better in my hands. However, as some of you know from another thread, I may have had some trouble with my harness and all those connections may be to blame, so try it at your own risk - jd
And Bob, I think your right (switch on the cellog #1 position). Besides, a little balance top off once in a while with a SHORT winter ride when the streets are clear (there are one or two days like that LOL) to take the packs down to storage level, and we'll be fine.
Yes, it could be left plugged in while charging (and often is for me) but it will contribute slightly to unbalancing the cells unless there is a parallel balancer/bms or periodic balancing procedure that is compensating somehow for the CellLog's unequal current drain of the cells. Of course that would require two set of balance leads to accomplish that. BTW, Gary's CellLog based boards should mitigate this minor annoyance quite well I believe, and allow for us to leave the CellLogs installed permanently with only a single set of balance leads.The Mighty Volt said:Can the Cell-Log be left safely in place on the battery pack while the pack is being charged?
If so, why would people feel the need to disconnect-connect the JST-XH connector to-and-from the cell-log so often?
Just my $0.02.
scoot said:BTW, Gary's CellLog based boards should mitigate this minor annoyance quite well I believe, and allow for us to leave the CellLogs installed permanently with only a single set of balance leads.