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  1. J

    First $1000 Budget DIY Ebike - NEED SUGGESTIONS

    Ebay Rear hub Kit = 150 Ebay Sun Ebike LifePO4 15AH = 325 A mtn bike off craigslist = 100 Range ~30-40 miles That's it.
  2. J

    Chinese Solar Panels and Customs

    Greetings, I just learned a valuable lesson on trade as it relates to Chinese solar panels and importing to the US. In short, this isn't allowed. I purchased some thin film mono panels from Aliexpress which were shipped via DHL. The panels got hung up at customs and I managed to contact them...
  3. J

    Initial high amp draws - Solar Charge controllers

    yes i am thinking it is a bit more efficient but I never did take any measurements before the conversion.
  4. J

    Initial high amp draws - Solar Charge controllers

    yes... I basically unbolted the mount that holds the compressor and twisted it so that it remained upright. Then I built a base so that the radiator on the back was off the ground. heres a vid https://www.youtube.com/watch?v=jYeVxlJ0qnM
  5. J

    Initial high amp draws - Solar Charge controllers

    Its an AC motor. I found that the DC motors are very expensive and hard to find. So i'm using an inverter. Thanks for the tip on the PWM timer ramp, i'll look into those.
  6. J

    Initial high amp draws - Solar Charge controllers

    I am finding that most solar charge controllers have low Amp ratings(10-30A). I recently converted a mini-fridge into a chest mini-fridge and am running it off my lead acid battery connected to the charge controller rated for 20A. When the fridge initially kicks on, it pulls nearly 40A and the...
  7. J

    Lithium charge controllers

    thanks guys for echoing my sentiments. I just wanted verify because I heard a guy saying not to use a particular controller with lithium, but if you know, and can set (program), the high voltage point for your batteries then you're good.
  8. J

    Lithium charge controllers

    I have one of those cheapo solar charge controllers for my solar setup. I am looking to go lithium/lifepo4 for batteries soon and im wondering what is the fundamental difference between the charge controllers. If you have the ability to set the controller to a particular voltage, what is it...
  9. J

    Which is the most efficient and cheapest battery available?

    Lets say you were going with the 48V motor... using Power=Volts*Amps 2500 W = 48V * I at this this rating you'll be pulling 52 amps continuous When you add those 12V 100AH batteries in series, you cant have your cake and eat it too :D. In other words, The AH ratings remain at 100AH per...
  10. J

    Prismatic 3,3V LiFePo4 20ah

    kind of funny... these are made in the USA but I cant find them here...hmmm
  11. J

    This 13S BMS

    So i bought another one of these exact items on aliexpress, except this time they sent me a different unit. Its larger. So basically they just send you whatever they want to i guess. I'll post some pics and compare them later.
  12. J

    *Dusting off the 1000lb of laptop batteries

    What this guy means is that laptop batteries aren't designed for high C rate. But of course you already knew that, that's why you got a Pallet! :lol: If you look at a discharge curve courtesy of this guy who tests most batteries for fun This is an example, some UR18650ZT I got from...
  13. J

    Homemade Battery Packs

    1000 lbs? That's a boat-load. I might be interested in some of those depending on the price and types of packs there. Do you have any idea what you'll be getting? :lol:
  14. J

    This 13S BMS

    Yes I have read his posts. many thanks goes to Drkangel! For my cells, I'm going to buy a factory new version as a benchmark. You have some good questions there about which cell dies out in the original packs. I might be able to get some information there in the long run, since I've numbered...
  15. J

    Balance wiring harness

    actually, i just didn't understand the schematic drawing. I see now that the angled lines are not connected at the batteries. I do see that you have two wires coming out of the middle nodes which seems redundant. But i suppose that's ok if you're required to do that because of the plugs...
  16. J

    48V configurations - versatility -

    everybody has their opinion around here that's for sure! :D
  17. J

    Balance wiring harness

    free upload image This looks like a short
  18. J

    Balance wiring harness

    Yes dan, something looks fishy. The balances wires are going a bit wonky. The top right cell has a wire going from the neg to the pos of the 1st battery in the second row... as long as you dont have a short there youre ok
  19. J

    48V configurations - versatility -

    I tried my local recycling center, but they didnt want to give or sell them. I got mine from eBay by searching "laptop battery lot" and they weren't cheap so good luck there. Best deal i found on used cells was 0.8 US dollars, which is 0.71 euros. And that was for Sanyo UR18650ZT That was a...
  20. J

    This 13S BMS

    :D :D I know all that stuff, but know nothing about how the BMS operates and is constructed. Have you done this? can I easily access shunt resistors on this BMS?
  21. J

    This 13S BMS

    you're a piece of work. Try replying without being condescending one of these days. The voltage will be changing, therefore the current will be changing, that is why I will monitor the current directly. I have completed the electrical engineering courses. If you dont want to engage then get...
  22. J

    This 13S BMS

    What I plan to do is get a few more ammeters and connect them to some unbalanced cells with the BMS wired in so I can see how the balancing is taking place. I will use my digital power supply.
  23. J

    This 13S BMS

    So i can probably use this BMS for any number of cells in series? I see that the number of connections goes up higher, but they only provided me with the 13S harness. I want to test it out with a single series set of cells just to verify that it functions correctly. Also to do some testing on...
  24. J

    This 13S BMS

    After one discharge i mean, I ride, and the cells slowly become unbalanced. I plug it in, and the BMS does its magic to ensure the cells all reach 4.2 volts when charged. When i initally build, what tolerance for series batteries should I have. 0.1V 0.01 V? 0.001 V ? Thanks dnmun
  25. J

    This 13S BMS

    after one discharge this wont be the case, so whats the point of the BMS then?
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