OneEye
100 W
Gary,
Welcome to the forum and thanks for the extended input.
Some of the folks here on Endless Sphere have also been tinkering with the DeWalt 36V packs, using the R/C community's experience as a jumping off point. I think you may find some of the information they came up with to be useful to your applications.
Our most intrepid DeWalt explorer is Doctorbass. He experimented on variations to a schematic produced by Jeff Ratdke at Neodymics and was able to demonstrate a setup for using the DeWalt packs through the BMS at 19A continuous, with the BMS providing a 25V low voltage cutoff.
Details of his experiments can be found here: http://endless-sphere.com/forums/viewtopic.php?t=2050
That discussion starts with a charger mod, but at about post 18 or so the conversation morphs to BMS testing/tinkering. The thread digression was my fault for posting the Neodymics schematic to the wrong thread. I initially thought they were hooking up a single charger to multiple batteries which was high on the wish list of DeWalt users. A second read quickly uncovered my error, but the damage was already done.
I hope the information cross-feed can confirm and improve on things they have been testing, and also prove useful to you. Post your experience if you implement any of it on-bike.
Those battery racks look good. I could see doing a single decker version for a 35V 4 pack arrangement.
Welcome to the forum and thanks for the extended input.
Some of the folks here on Endless Sphere have also been tinkering with the DeWalt 36V packs, using the R/C community's experience as a jumping off point. I think you may find some of the information they came up with to be useful to your applications.
Our most intrepid DeWalt explorer is Doctorbass. He experimented on variations to a schematic produced by Jeff Ratdke at Neodymics and was able to demonstrate a setup for using the DeWalt packs through the BMS at 19A continuous, with the BMS providing a 25V low voltage cutoff.
Details of his experiments can be found here: http://endless-sphere.com/forums/viewtopic.php?t=2050
That discussion starts with a charger mod, but at about post 18 or so the conversation morphs to BMS testing/tinkering. The thread digression was my fault for posting the Neodymics schematic to the wrong thread. I initially thought they were hooking up a single charger to multiple batteries which was high on the wish list of DeWalt users. A second read quickly uncovered my error, but the damage was already done.
I hope the information cross-feed can confirm and improve on things they have been testing, and also prove useful to you. Post your experience if you implement any of it on-bike.
Those battery racks look good. I could see doing a single decker version for a 35V 4 pack arrangement.
i will definitely check out that thread, thanks. I recently saw the Neodymics schematic, which is where I found out about the 2nd switched output. I'm still not sure why the went to such an exotic switching circuit to enable the packs, but I am very interested in the use of the Schottky diodes to isolate the packs. I'm thinking of playing with that to see if there is any real benefit to isolating the packs. Normally, I would usually put all cells in parallel before connecting the parallel blocks in series, but that only works with packs made from loose cells and it really should be done with cells that are closely matched, or at least from new packs. I've got several hundred cells total, but they all have varying amounts of cycles, and abuse, for that matter. It's not so hard to match about 16 cells, so I've been doing lots of 16s "chunks" that can be charged seperately, from time-to-time.
