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24 volts DC to 48 volts dc

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    24 volts DC to 48 volts dc

    Can any one tell me if it is possible to achieve the above ? I have two nearly new 30ah 24 volt batteries, but have just changed to a 48 volt motor.
    I have an occasionally used 24 volt folding bike, but these 24v batteries are largely going to be sitting doing nothing, so it would save me megabucks if I can use them on the new 48v set up.
    [I wouldn't want the weight of using both in series ]

    #2
    A DC to DC converter is available, but perhaps not cost effective. And at 7 pounds.

    Example- https://www.powerstream.com/dcdc-extreme-2448.htm
    See my completed Magic Pie V5 rear hub motor E-Bike build HERE.

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    • Kenm
      Kenm commented
      Editing a comment
      Yes, I saw that one, but nothing available in NZ. Also at only 10 amps , not much use for my BBSHD!

    #3
    If you wired them in series, what would the resulting 48V battery weigh in at? In other words, what is the combined weight of these two batteries?

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      #4
      Only reasonable setup would be in series. If that's too big of pack then you're kinda screwed. DC-to-DC wouldn't be very efficient and quite a mess to setup, IMO.

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      • Kenm
        Kenm commented
        Editing a comment
        yes, I have come to that conclusion. Both are big ,square, Ping batteries, hard enough to neatly put just one on a bike! At least they should last for years on our folding bikes which are only used a couple of times a week.

      #5
      There's a guy on the endless sphere forum reporting that he had been able to convert 36V to 48V and gets about 1000 Watts out. I would have been skeptical but he says this unit works.

      Wangdudd22 DC-DC converter You might have to look around to find one on ebay specific to your country.

      He' not running a big motor, probably a 500W geared motor.
      Last edited by HarryS; 12-12-2017, 10:09 PM.

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      • Kenm
        Kenm commented
        Editing a comment
        Thanks for that.Sounds interesting and is available from Bangood, a company I buy from quite often Bangood have really great prices and often have free shipping.
        As an example I have just bought an electrical bike pump, which appears identical to the Luna one, but only cost me $24 NZ, with free shipping.

      #6
      Click image for larger version

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ID:	54960 Products from Bangood

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