FireBALL Posted June 27, 2015 Author Report Posted June 27, 2015 Can three IMR's be used or power management is designed only for li-poly batteries?
Cotay Posted June 27, 2015 Report Posted June 27, 2015 It appears that IMR 18650s can be used but you would need an accessory board from Evolv to convert them to a pack with the appropriate tap connector.Page 10 of the datasheet says the following:"If you are manufacturing a device that is designed to be used with three individual replaceable 18650 cells, an accessory board is available from Evolv to adapt from three individual cells to a pack and tap connector pinout, as well as provide cell-by-cell protection against incorrectly installed or reversed cells."
VapingBad Posted June 27, 2015 Report Posted June 27, 2015 Also on p13The DNA 200 runs from a 3s lithium polymer type battery pack. This type of battery requires cell-by-cell battery monitoring and balance charging to operate safely. The DNA 200 connects to the cell taps on the battery pack with a four position JST-XH connector. The tap connector must be connected for the DNA 200 to run.
FireBALL Posted June 27, 2015 Author Report Posted June 27, 2015 Thank you guys, much appreciated.How do you feel about using Li-Polys instead of IMRs
blueridgedog Posted June 27, 2015 Report Posted June 27, 2015 The better capacity, form factor, pricing, performance and availability of Lipo make the obvious choice, IMHO. The RC industry has already driven the high drain curve in that market and we have many off the shelf, drop-in options to choose from.
alee132 Posted July 3, 2015 Report Posted July 3, 2015 I have not seen this accessory board for sale anywhere which leads me to believe its not going to be out with the release of this chip. It's something coming a little later. So most people are going to have to use the lipo's till that board is released. Which for me it doesn't matter because I am planning a build for power supply and one for on the go with a lipo.
lolerwaffles Posted July 4, 2015 Report Posted July 4, 2015 With IMR, you build it out like you are making a lipo pack, i.e. making your own balance leads. It works great.
Cisco Posted July 4, 2015 Report Posted July 4, 2015 Balancing tap is nothing more than wired taps on your batteries. If you are going to run 3s IMR's, wire in a balancing tap and the DNA200 will charge and monitor each cell. the eBay link is for reference onlyhttp://www.ebay.com/itm/5-PCS-3S1P-Balance-Charger-Cable-Wire-JST-XH-Connector-Adapter-Plug-/221751627797?pt=LH_DefaultDomain_0&hash=item33a16d5015-C
James Posted July 4, 2015 Report Posted July 4, 2015 The reason for an accessory board is to provide reverse voltage protection for each cell. Otherwise you could damage your board and/or batteries in the event you put one in backwards.
lolerwaffles Posted July 5, 2015 Report Posted July 5, 2015 I kept it simple and used springs that will collapse on a short. It wouldnt protect the chip, but it doesn't protect against reversed batteries shorting against each other. James said:The reason for an accessory board is to provide reverse voltage protection for each cell. Otherwise you could damage your board and/or batteries in the event you put one in backwards.
VapingBad Posted July 5, 2015 Report Posted July 5, 2015 On DNA30s I have used a spring with a diameter too big for the +ve battery terminal for -ve connection and a completely flat +ve connection that will not make contact with the -ve end of batteries with a flat bottom and heat shrink extending over the bottom like 25R & VTC4. It is the flat positive connection that really provides the protection, I have fitted batteries the wrong way 3 or 4 times in another DNA30 I did like this and it is still going after 18 months.
XavierCalderon93 Posted September 22, 2015 Report Posted September 22, 2015 Hey guys! I was reading through everything and I had a question about the connection to the board needed. According to the pictures posted of the physical board, there is a 1-3 and a ground. According to the diagram posted earlier, there are 4 connections( 2 pos, 2 neg) but no ground. So my question is, does there need to be a ground and if I plan on doing 26650s can I just solder to each POS part of the cradle?
EvilMogwai Posted September 25, 2015 Report Posted September 25, 2015 Xavier, don't go on the colors used in Cisco's diagram. On the balance connector he means bottom black to GND, then red to 1, black to 2 and top red to 3. Guess he assumed everyone would read it like that. If you use a connector there you can switch between a lipo and imr pack Optionally you can bridge - to GND and + to 3 on the board and only connect wires 1 and 2 to the bridges on the sled. Be advised that any 3*1s setup should wait for the specific extension board to provide single cell reverse battery protection.
VapingBad Posted September 25, 2015 Report Posted September 25, 2015 Evolv plan a protection for 2 cell as well and the same applies as to 3 cell regarding reverse protection it is at your own risk.
EvilMogwai Posted September 25, 2015 Report Posted September 25, 2015 Hmm, my 2s Boxer DIYkit is about to drop in (when it finally gets through customs), so I'll have to build it twice, once now without the protection and then rebuild it when I finally get the protection board. Hope it'll still fit in there
lewisss Posted November 3, 2015 Report Posted November 3, 2015 James said:The reason for an accessory board is to provide reverse voltage protection for each cell. Otherwise you could damage your board and/or batteries in the event you put one in backwards.Is this board available from evolv, and if so where?
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