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Thread: Cap banks - the pre-emptive answer

  1. #361


    Quote Originally Posted by CraigP View Post
    Yes, current limiting IS power reduction. But this would be an effective tool to get the setup right, so you can take the current limiter off and have confidence what power levels you will be running. I want to use it in tandem with the data logger and fix the set up so it runs on the power budget.

    My end goal is to master the use of high voltage packs and make power with higher V, instead of higher A. This reduces the stress of the entire electrical system and helps to prolong battery life, since the current draws will be lower. But these BLDC motors are most unforgiving in trying to reach that goal. I want a tool that will minimize my electrical failures. I see it as a perfect tuning tool to reach no current limited AND no broken parts! I ain't made of money Doc! Thanks for the advise, hang in there with me...
    A thing with power availability. . The nore there is, the more people will push those limits.
    With esc now capable 12s+ 300A+ , we need support the higher end demands of this market also..ETTI 5x35v1000uf banks suits most every 6s or lower setup.
    Access to higher voltages leads to higher amps and the associated expectations of more of what this sport is about -> Fun .
    What i detailed initially catered more the upper end of our hobby, and although taken up by lower cell count runners, that wasnt the aim. .
    Latest battery construction generically support more kwh than our 90%+ users demand...
    I see 90%+ of this hobby as plug and play experts .... Lol
    Indubitably there are refined capacitor arrays producable for independant applications ..
    This thread started as an introduction to a generic idea supporting the high end users who had clouded thoughts over unexplained repeatable failures :grin:
    From there this has grown into a long diatribe... which is good for the hobby !

    Stay in touch ... :)
    Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
    @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

  2. #362


    Those that want to stay abreast of battery tech and amperage capabilities will have to come to terms with the problems associated with switching so many amps. 1-1/2" of #10 wire is enough inductance (about 0.8uH) to really start causing problems. 12s at 300A, crazy KW levels in such small form factors! But the larger classes (1/8 and 1/6 scale) could certainly use the power.

    My goal with the DF33 Hydro is to achieve WOT turns, in race water and run about 60-65MPH on the straights. Above that, and it gets out of my reaction capabilities, though I'm sure some young bucks got the reactions times... I just turned 60, so I'm not what I was in the old nitro days. But I love this stuff Doc, God knows I love it! Keeps me young

  3. #363


    Quote Originally Posted by ray schrauwen View Post
    It has been a thought of mine for some time that why mosty Suppo esc's burn up is most likely due to faulty caps they buy in massive quantities not caring if they are way out of spec or just not made right at all. I mean, the fets on Suppos are a discontinued fet in USA that was shipped in container loads to China like many other obsoulete electronic components.

    A while back I grabbed a near new HK SS100 esc and the cap wires nearly fell off from inside the caps?? I replaced the caps with blue 1000uF 35V-130* Rubycon RX30's right onto the board. It works very well now.

    I remember Etti used to use the Suppo base board BUT, they used the blue Rubycon's instead.... wonder why.
    Quote Originally Posted by drwayne View Post
    ditto CC240LV 3+ years back... use to burn cap leads ... 4S 1515/1Y - pop .. changed to upmarket caps.. 6S1527/1.5Y
    around then decided to design own esc.... never looked back
    THis esc is still running well even when I use it to test iffy or bad motors on bench.

    Cool... $20 esc....


  4. #364


    There seems to be a lot I should read, subscribed! .Thanks Wayne.

  5. #365


    Yes, there's 150deg C caps too with high ripple current. They are NOT cheap! If you buy your own, remember there are 2 ripple specs, 60Hz and 100KHz. You want to look at the 100KHz number. Good caps aren't small in size, they need some mass to handle the heat. Some of these little dinky caps they are installing in these ESC's are a joke!

    It's not necessary to replace, putting good ones in parallel will bolster them up. I buy my caps from Mouser, spent a lot of time researching specs.. If anyone is interested in some part numbers, just let me know...

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