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  1. I

    Which BMS for lead acid battery replacement in I.C.E. motorcycle application?

    I recently had one of the cells on my lifepo4 motorcycle battery go poof, and when I opened the thing up I noticed that the shunt resistors on the BMS seemed somewhat less than impressive. I know these things are only built to take 3 or 4 amps, but we're talking gnat's ass surface mount...
  2. I

    BMS for motorcycle battery?

    Anyone know of a BMS that would be suitable for use in a vehicle starter battery? They want about $170 for a 4ah motorcycle battery and I just can't bring myself to shell out that kind of cash for a battery with so little capacity. I was thinking maybe 4 15ah headway cells in series would do...
  3. I

    Choosing a power supply for paralell charging...

    I have about a dozen 40ah lifep04 batteries (split into 3 packs, of 4 parallel cells each) that I want to charge, and I was hoping somebody might be able to give me some advice on which power supply I should go with. The two that best seem to fit my needs are the meanwell rsp-500-3.3 (or...
  4. I

    Pneumatic Transmission?

    I've been farting around with the idea of using a high speed rc motor for my next build, simply because the little buggers are cheap as frak, crazy efficient, and weigh a fraction of what a comprably rated hub would weigh. The only problem is that no matter how I slice it, I keep coming back to...
  5. I

    DIY AC TIG Welder using an e-bike controller?

    I've been on a DIY how to build "absurdly expensive shop tool X, using off the shelf parts" kick lately, and while sourcing aluminum for a cnc router project, I realized that it would be much easier to build the router if I built an AC tig welder first. It then occurred to me that the PWMed...
  6. I

    High speed mid drive hub as a gyroscopic stabilizer?

    I've been toying with the idea of coupling my high speed 5302 hub to a front limited slip differential drive train robbed from a small quad ATV via a gocart gearbox to power a long travel rear suspension all wheel steering delta trike, and it occurred to me that there is nothing really stopping...
  7. I

    Hub Zilla Build Vrs Dual H series Crystalyte Build

    I'm in the akward position of having 60v (18s) worth of thundersky 40ah hour batteries on a 70 lb recumbent with a crystalyte 5302. Needless to say, it does pretty much make for the ideal death trap of unstoppable kinetic energy at speed on the flat (think 320lbs at 60 miles an hour with nothing...
  8. I

    Help configuring 18 fet Lyen Controller...

    What I have: 1 Lyen low rds 18 fet delux regen controller. 1 Crystalyte 5302 straight laced into a 16" moped rim (aka a beefy 20" bike rim) 18 40ah thundersky cells. 24 "mini-bms" distributed style bms modules 1 50lb Walmart hyper insight suspension recumbent with custom triple tree clamp front...
  9. I

    Cheap Variable DC-DC converters?

    I've been trying to track down a source for affordable high wattage DC to DC converters, and figured others on the board might have a similar interest so I thought I should start a thread. More specifically I'm looking for something in the 1000w range that can take an input near 70v and output...
  10. I

    So I have this Crystalyte 5302 hub...

    I'm just wondering if the Crystalyte 5302 is in demand these days since they don't seem to make it anymore. I bought it thinking I would need the speed since I wanted to operate at a low voltage, but now I'm running 91 volts hot off the charger and the damn thing really is just plain too fast...
  11. I

    Cheap 18a 12v power supplies....

    I was poking around for power supplies to use with an HTPC project when I ran across these... https://www.redplanettrading.com/Dell-DA-2-M8811-Y2515-D3860-MK394-D220P-01-Power-Supply-Adapter.html and it occurred to me that they might make for a pretty cheap charger if strung together in series...
  12. I

    Mixing Thundersky and GBS batteries...

    I recently ordered 8 40ah thundersky batteries from Alliance Renewable energy in order to increase the size of my pack from 16 to 24 cells. When the batteries arrived however something seemed a little off, the valves were missing the thundersky logo cap, the plastic seemed to be a slightly...
  13. I

    What exactly do I need to leave a pack charging unattended?

    Ok, so I recently purchased a 24s mini-bms system from clean power auto for use with 40ah thundersky cells, and I'm in the process of hunting down a charger, but this is my first time putting together a pack, and to be entirely honest I'm just not sure what all I need to have in place before I...
  14. I

    Calandar life impact on Thundersky cells....

    About a year ago I purchased 16 40ah thundersky lifeypo4 cells with the intention of doing an e-scooter project, but the BMS I was hoping to use just hasn't been available, so the cells have been sitting on a shelf the entire time. I've got a little extra cash to throw around at the moment...
  15. I

    Your favorite twist throttle and hand brakes..

    I've been poking around in search of a nice twist throttle and a hand brake for regen, but with this kind of product its hard to tell which is going to have the best feel to it until you actually have one in hand. At any rate, I thought I'd ask you all which throttles and hand brakes you've...
  16. I

    Is it possible to brake by wire with a non regen controller?

    I've been hunting for a cheap 48v 50amp controller to pair with a 2kw crystalyte hub for a while now, and was about to give up when I ran across the Yi Yun YK42-4. Its about as no-frills as they get, but from what I hear it is actually a pretty solid controller. My only problem is that the hub...
  17. I

    Anyone have a used 48v contoller they want to sell?

    I was about to go buy a 48v 100amp controller from Kelly, when it occurred to me that with all the people around here upgrading to 60v+ controllers there must be a decent number of used 48v controllers floating around the board. At any rate, if you've got a 48v controller in that range that you...
  18. I

    Does anyone know where to get a 2000 to 3000w hub motor?

    I'm in the process of building an ebike out of one of the wallmart hyper fitness bikes, and starting to realise that my battery is kind of overkill for an eike application (16s thundersky 40ah cells) so I thought perhaps I should step the project up to something more like an electric moped. My...
  19. I

    Anyone have experience with Thundersky LiFeYPO4 batteries?

    I'm thinking about strapping together about 16 of the new Thundersky LiFeYPO4 40ah batteries in series to make myself a 48v pack, but I thought I'd ask around to see if anyone has any experience with them first. They are rated at 3c max continuous discharge rate and an average discharge rate of...
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