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  1. R

    Turnigy Multistar - lightweight 10C cells

    Unfortunately not really. That motor has probably usable ratings (20kW/5000rpm), albeit about half the one I'm using, but it weighs over twice as much at 39kg and I would still need to do something to offset the shaft. I have about 95mm between my pump shaft CL and the inside bottom of my hull...
  2. R

    Turnigy Multistar - lightweight 10C cells

    Oh, and I would think grounded plumbing has something to do with hair dryer electrocutions.
  3. R

    Turnigy Multistar - lightweight 10C cells

    Mostly agree. Like a story passed down from multiple tellers, somehow my 96S has turned into 800V. I wish I knew what chemistry caused that :D . I'm also not sure being in saltwater with a bunch of cells discharging would be deadly. Why would the current not travel in the lowest resistance...
  4. R

    Turnigy Multistar - lightweight 10C cells

    I'm sure sorry I brought up the Tesla charge connector....now it appears I don't even know what the difference between salt and rain water is even when I state it's a completely different environment. BTW Tesla is likely using 400V because it is inconvenient to boost high current charge voltages...
  5. R

    Turnigy Multistar - lightweight 10C cells

    I believe you can make a gazillion volt series pack, as long as you mind the insulation resistance between the high potential points in the system...i.e. anything tied to negative needs more and more (insulation) resistance relative to the voltages available up the cell chain. Voltage potential...
  6. R

    Turnigy Multistar - lightweight 10C cells

    Anyone else have specific experience with the 20Ah multistars?
  7. R

    Turnigy Multistar - lightweight 10C cells

    I still can't get my head around this. The last cell doesn't have the first cell anywhere near it so how is it having to insulate the rest of the string voltage? Of course if the cells were all sitting next to a ground reference it would be different, but they aren't.
  8. R

    Turnigy Multistar - lightweight 10C cells

    Ianhill, I don't really understand how the insulation resistance plays a part, but it may be my ignorance. The adjacent cells within each brick only see the voltage difference between those adjacent cells and I will arrange each brick as I described earlier in isolation from each other with...
  9. R

    Turnigy Multistar - lightweight 10C cells

    miuan, Yes good point, test all packs and only incorporate ones that balance well. What 18650s could I use to get 5C peaks from? Any way you look at it I need ~5-7kWh capacity and need to hit ~35kW peak discharge.
  10. R

    Turnigy Multistar - lightweight 10C cells

    Sunder I do understand the risks and the IP rating system. My point with the comparison is that with the Tesla you are even making a wet connection, something I won't need to do on the ski. There is a sealed engine compartment that all this will be in, so spray isn't likely but the design will...
  11. R

    Turnigy Multistar - lightweight 10C cells

    I am pretty sure I can mitigate these risks, but you do have a valid point. The battery will be in a sealed enclosure, conductive on the outside but likely isolated from negative(?). I have considered 3D printing this in plastic but it will need to be somewhat larger to achieve the strength. I...
  12. R

    Turnigy Multistar - lightweight 10C cells

    Well I think I can mitigate the problem during charge. I'm more concerned about being miles out in the ocean discharging them....a bad enough fire would mean swimming. There must be some kind of warning in cell voltage?
  13. R

    Turnigy Multistar - lightweight 10C cells

    Hello, I have a different sort of bike that for various reasons am considering an electric conversion. One battery option I’m considering is to use 96S multistars, 24 x 4S. I believe I need about 30A on average with few second bursts up to 80-90A. From what I have read on this and other...
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