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First I would like to say that I am a software developer with limited skills in electronics.

I am trying to build a setup to charge my electric longboard batteries from an usbc power delivery input. I have an usbc decoy connected to a buckboost module, which enables me to set to output voltage and amperage.

Now, my target is to have 28.6v and around 1.2a as an output. The problem is that I can't seem to be able to set the current. From what I understand it needs to be under load to be set, but when I connect the battery the buckboost restarts, I presume some protection kicks in. So I can never see the current of the setup... I just blindly turn the amp knob with no feedback.

I checked the polarity for my setup compared with the originAl charger (see pictures) and seems to be the same. Any suggestion is highly appreciated! Thanks for reading. input output my polarity original charger polarity

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  • \$\begingroup\$ Schematics and data sheets needed. What amp are you talking about? Do you mean to say "current" when you say "amp" maybe? \$\endgroup\$
    – Andy aka
    Mar 14, 2021 at 16:41
  • \$\begingroup\$ Yes, I mean current. The input should be 3a,and the output I need is 1.2a. There is no schematic, its just a decoy connected to the buckboost. \$\endgroup\$
    – aciobanu
    Mar 14, 2021 at 17:48
  • \$\begingroup\$ Are you measuring with a load. No load, no current. \$\endgroup\$ Mar 14, 2021 at 18:40
  • \$\begingroup\$ well i was thinking that is the issue. However i can't use the real consumer (the battery i want to charge), as it is restarting the buckboost.What can i use as a consumer ? \$\endgroup\$
    – aciobanu
    Mar 15, 2021 at 6:52

1 Answer 1

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So in the end what i had to do is to really turn the current knob down for quite a while, and then i was able to plug in my battery/consumer and slowly raise the current until i got what i needed. Previously was at a too high level and it was triggering the protection on the battery.

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