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  1. Korishan

    DIY CNC Router

    Nice! Just shows we don't always need to use extruded aluminum for such things
  2. Korishan

    Tomzn DC Circuit Breakers (Yellow vs Blue)

    This is true, mostly. I would say for 48V system, you want at least 65-80V, as 4.2V * 14S = 58.8V. And if you only want to go to 4.0V and run 15s, then 4 * 15 = 60V. The clamping voltage shouldn't be near the operating voltage for as you get close to the clamping voltage, it starts to heat up...
  3. Korishan

    Wolf's PowIRwall

    Close enough for gov't work :LOL:
  4. Korishan

    Add 36V Battery Block to 48V Battery System?

    I vaguely remember something about this. It is not recommended in any way to mix voltages like that. Not only are you causing an voltage/amperage imbalance of the strings, you would also be creating a possible over-voltage situation if the buck converter half fails for some reason in the wrong...
  5. Korishan

    Mobile Phone with thermal camera built in.

    Android is a LOT easier to operate and most settings are common sense locations. :P Ohhh, and you won't have to worry about an update that'll tank your processor, slow it down, uninstall apps, or any other non-sense that Apple has done to their older phones "to save the device and make it run...
  6. Korishan

    Hello from Florida

    Looking that pump up, might be able to repurpose a old air compressor head. If the reed valves aren't stainless, replace with SS. If it's only watering something small, that should do the trick. Then any dc motor could turn it. Just would need to get the pulley dimensions right. Might even...
  7. Korishan

    When things go wrong... it can go really wrong!

    I think this thread has gone off topic 🤔
  8. Korishan

    Spot welding on batteries with residual solder

    I wasn't stating to use the cells that could possibly have solder in the CID area. I was stating that the cells that have solder on the ends instead of trying to remove the solder, use them for other projects instead of trying to build a large pack with them where spot welding is to be used. Any...
  9. Korishan

    Spot welding on batteries with residual solder

    Or just solder those cells in a different smaller pack design. Different projects.
  10. Korishan

    Are Parallel strings bad practice?

    The only thing I can figure as to why D makes a difference is that between each series block, current can flow through the least resistive next section. It is quite possible that a pack could be more resistive than another that is connected in parallel. Having a higher resistance would give off...
  11. Korishan

    Are Parallel strings bad practice?

    - Eddy currents will happen no matter what. - Lower capacity, I'm not sure I follow on this one. Electrically there is no difference between having 4x 7s20p or 1x 7s80p. You get the same voltage, ampacity, and capacity - Exponential impact of one bad cell?!? I don't get this one either. If a...
  12. Korishan

    Spot welding on batteries with residual solder

    Use a set of flush cutters to snip off as much as possible. This will also leave a flat-ish surface. Or you could use a big a iron (100+W with a fat tip) with some solder wick and tap the cell for <1 second. Should be enough to melt the solder and pull it out with the wick. Since it's the Pos...
  13. Korishan

    Are Parallel strings bad practice?

    Anyone who has a sizeable battery storage has parallel battery banks. If I remember correctly, Daromer has 5 in parallel. All strings have their own bms. When dealing with small banks, it's not really feasible to have individual strings with bms'. So if only dealing with a few hundred, not...
  14. Korishan

    I think I found the issue... HEATERS!

    Based on seeing the videos, pictures, and chatter over in the other thread (https://secondlifestorage.com/index.php?threads/when-things-go-wrong-it-can-go-really-wrong.10317/), I will have to agree. There should of been warning signs evident that were ignored, or misunderstood. A rise in...
  15. Korishan

    When things go wrong... it can go really wrong!

    Not really, because what you are looking for is a deviation from the normal. If while under charge the temp sensor only goes up by 2C above ambient for a particular sensor, and under heavy discharge can raise to 4C, then you can graph that over time. Then one week, the scale shifts to 3C during...
  16. Korishan

    Detecting heaters and other cell testing questions

    Check out Wolf's thread on IR/Ohm readings. I think he has a full chart for various different cells. There are different values because different class cells with different IR readings. For example, a laptop cell may have a higher IR, 40-Ohm, or maybe a little higher. But a power tool cell will...
  17. Korishan

    Detecting heaters and other cell testing questions

    Swap #3 and #1. Test IR first. This will weed out any unnecessary charging. By doing an IR test first, you will also weed out the majority of possible heaters. It won't grab 100% of them, though. This is in part due to things outside control, like dendrite growth. However, this is where further...
  18. Korishan

    Tomzn DC Circuit Breakers (Yellow vs Blue)

    Yes, this is what I was trying to think of. I forgot it had an actual magnet in there.
  19. Korishan

    When things go wrong... it can go really wrong!

    This would only be if the short was a full on short. However, a slow short, one that barely makes contact, can drastically have a negative effect on the device(s) being involved in the short. There have been many houses burned down because wires in the wall had been frayed and were barely making...
  20. Korishan

    Tomzn DC Circuit Breakers (Yellow vs Blue)

    For one, an AC breaker doesn't make much of a difference. The disconnect arc well self quench due to the alternating current With DC, this is not the case. These breakers can be designed directional. Some of the circuitry in them may be directional. If there is a +/- (meaning Line/Load) or a...
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