Readers Comments (3)

  1. I used Ryobi 18v battery packs in series/ parallel config to reach 58.8v(all charged about 80-90%) for a while, but using these powertool packs will shorten their lives a lot. Driving that power through the OUTPUT of the pack from one to the other. They are designed to be charged at much lower levels. I used mine for only a month before purchasing a real 58.8v pack. I do not recommend

  2. Nice video and nice explanation for MPPT but I have to say that this green Aliexpress charge controller isn’t a MPPT charge controller. Yours is working completely differently. It is a PWM step up charge controller and the label on it is just fake. I know these boxes. There are many Chinese “fake MPPT” charge controllers.
    MPPT: input voltage must be much higher than battery voltage (charge voltage). Has a large inductor that is typically expensive. Advantage: higher input voltage means lower input current and thinner PV cables.
    PWM: input voltage should be lower than battery voltage otherwise the controller is very inefficient. No need for inductor, cheaper. Just PWM and some capacitors. But for an eBike it is ideal.
    I prefer to use two 18V (20V max) batteries in series and connect it parallel to the built in battery. One ideal diodes in series for each battery pack (internal built in and external) prevents a shorten of the two battery packs and you are fine. In your solution the external battery charges the internal battery (with losses). In my solution they are just parallel and no current flows from one battery to the other. It depends what you are wanting. Both solutions have advantages and disadvantages.

  3. Ernie Sarracino May 21, 2021 @ 2:03 am

    Where do you order the parts

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