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  1. flippy

    Running parallel battery pack. I need help please.

    probably. just make sure the voltages match within 1V before connecting them up.
  2. flippy

    Building a large capacity battery for bicycle trailer

    cycle life does not really matter here. the rest of the bike will fall apart before you kill a 18650 pack of that size. and its 10kg lighter and can be made in a more practical shape...
  3. flippy

    Building a large capacity battery for bicycle trailer

    yes. i am sure. a 20S20P pack can absorb 40A. 40A*72V=2880W at 84V peak charging you will see 3360W
  4. flippy

    Building a large capacity battery for bicycle trailer

    if you use the samsung 35e you can charge at 40A in 2 hours and still stay within spec. the big problem is not the battery, its the plug. you will be more limited on how much you can pull from the wall then what the battery can take. even at the "offical" limit of 35E cells you are already at...
  5. flippy

    kWeld - "Next level" DIY battery spot welder

    smart chargers dont work. you need dumb stuff. a HRP-600-7.5 would give you recharge times faster then you can physically move. i use a 300 and that can keep up with my welding speed just fine.
  6. flippy

    kWeld - "Next level" DIY battery spot welder

    the new kcap simply cuts the power of the incoming charger. but there is no useful reason to rely on the protection system of the board to prevent destruction. there is zero reason to buy a higher voltage source, it only adds inefficinety and cost.
  7. flippy

    Charging a 13s 10ah with HLG-240H-48B?

    its laid out in the datasheet.
  8. flippy

    kWeld - "Next level" DIY battery spot welder

    you CAN input more, it just kills the caps faster. they also get VERY hot of you do.
  9. flippy

    kWeld - "Next level" DIY battery spot welder

    the board only balances, it does not cut power.
  10. flippy

    Charging a 13s 10ah with HLG-240H-48B?

    some B versions do, that is why i mentioned it. you can buy 2 100k 10 turn potentiometers and set the voltage and current that way.
  11. flippy

    Charging a 13s 10ah with HLG-240H-48B?

    if your B version has the 2 rubber caps to set the voltage and current you are fine. you do need to short the extra wires out properly in order to get it to work.
  12. flippy

    Bluetooth DC energy monitor

    try one of those green 7 segments, you can run those in the microamp range and still be visible in a room. and 120V would be extremely useful. that would cover 20S batteries wich is the most common.
  13. flippy

    Bluetooth DC energy monitor

    lower the brightness. especially with green leds you need very little current to get usable visiblity from it.
  14. flippy

    Building a large capacity battery for bicycle trailer

    or just build/buy a moped/scooter at that point...
  15. flippy

    Compression of pouch cells, info/data

    if your packs are getting big then the compression also gets to be a pain to prevent the side plates from bulging. you need thicc plates or extra bars to strengthen it. no to mention keeping everything together in an already big and heavy package. if you have a solid process its not much harder...
  16. flippy

    Compression of pouch cells, info/data

    this is why cylindrical is natually more robust and durable, every cells has the perfect compression casing built in.
  17. flippy

    is there a prob in this battery diy plan with prebuid case?

    again, this is all your personal bias seeping in. you need to look better if you dont see that yourself.
  18. flippy

    Building a large capacity battery for bicycle trailer

    8kWh would weigh 30 kilos even with the best 18650 cells. 33 with a nice case and waterproofing.
  19. flippy

    Compression of pouch cells, info/data

    what an utter dumbass. "you dont need compression but you do need to prevent the cells from expanding". no shit sherlock, that is what compression does..... :bigthumb: TL;DR: you need compression.
  20. flippy

    is there a prob in this battery diy plan with prebuid case?

    no, if i have to recell a pack (usually after water damage for example) i simply hack out the enitre block that is damaged and rebuild the missing piece. i am utterly not caring for single cell that might still be good. it take me just a few minutes with some side cutters and/or a dremel to...
  21. flippy

    is there a prob in this battery diy plan with prebuid case?

    i worked in a body shop for 3 years. its not hard in the slightest. welds give a lot less problems then bolts. i can strip a spot welded bodypanel with a simple plasma cutter in less time then you can drink a cup of coffee or get a single stripped or rusted bolt or nut loose. and you dont...
  22. flippy

    is there a prob in this battery diy plan with prebuid case?

    why do you keep making it sound like welding is a bad thing? pretty sure there are more welds in a car then bolts.
  23. flippy

    Live cycles lio-on battery

    depends on how fast you charge. if you can deal with the capacity loss you should use the cell between 3.2V and 3.8V for example. it gives the same capacity as 3.6~4V but the lower peak voltage increases the lifespan. 80% of the energy of a cell is between 3.3 and 3.9V.
  24. flippy

    Synchronous buck converter - step down

    even a good compressor based fridge will pull 4~5 amps, and well into the dozens if it does not have soft start. no way that thing will survive that. you need something proper like the SD series from meanwell.
  25. flippy

    Rebuilding an ebike battery - Help Needed!

    yeah, dont buy that crap.
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