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Strkr69

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Reply with quote  #1 
Hello all, hoping to get some help here. I'm running into issue with the board not staying fired up, with 2 fresh batteries installed and holding the fire button it will cycle through : Evolv DNA 250, Check Battery, Then display current wattage settings, the battery indicator "which reads empty" and the Ohms, Volts, Amps... all which read zero..

I've checked my power coming into the board from the battery sled, reads 8.32 Volts.. I've gone in and set the configuration for 2 cell, Tried 2 other batteries that are also brand new, Pulled my board back out, checked all my connections and solder joints, reassembled and still same results.

Any help would be greatly appreciated.
ChunkyButt200

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Reply with quote  #2 
does the board connect to escribe? what are both cell voltages and pack volatge in device monitor? do you have the balance tap wired correctly for 2 cell config?
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Strkr69

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Connects to Escribe, Cell #1 4.62 volts, Cell #2 1.04 volts..  Pack voltage 5.66 volts,  Probing both leads at the board with multimeter shows 8.35 volts.  Settings have been uploaded for 2-cell, with appropriate Watt-hour Calculator adjustments made for the cells. Which are IMR 26650 3.7V 4000mAh.  Ground lead for "Tap" goes to Negative side of Cell 1, "1" goes to positive side of cell 2, and "2&3" are tied together going to the bridge between cells 1&2.
dwcraig1

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Reply with quote  #4 
2 S balance tap.png
F
rom left to right 3,2,1, ground


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Strkr69

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IMG_20170204_010214125.jpg  IMG_20170204_005926290.jpg  IMG_20170204_010311534.jpg  IMG_20170204_010255454.jpg 
Strkr69

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IMG_20170204_005857349.jpg 
Strkr69

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Reply with quote  #7 
Got it !! Actually less wires in the case now, I looped 2&3 to the positive supply on the board, 1 wire to the bridge and 1 to the negative side of the board.

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jpeg IMG_20170204_020221711.jpg (163.74 KB, 17 views)

retird

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Reply with quote  #8 
From your first picture.....Are you sure you wired the balancing connections in the right order... looks to me that you wired them backwards... but you got it sorted out now???

Untitled.png 



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Strkr69

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Reply with quote  #9 
Yes [biggrin] I looked at the diagram that Dwcraig1 posted and swapped a few wires. Mod works great now !!! Very happy, now to see how much longer it lasts compared to my Reuleaux RX200..   I built the case from 1 layer of fiberglass, followed by 3 layers of carbon fiber for strength and obvious cool looks. I really appreciate the response's and help. Nice to know this forum page has people paying attention and very helpful.
retird

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Reply with quote  #10 
Enjoy.......  [thumb]
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I am not an employee of and do not represent Evolv Inc.  My opinions are just that and are not meant to be fact or even correct.

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