I've already made one that goes 60volt, but now have a device that needs 84 volts to the input of a BMS (battery management circuit). 90 watts -- OEM charger is 1.45 amps @84 volts.

https://www.amazon.com/gp/product/B00BZR9PBW/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 this is the 60 volt booster i've used in the past

https://www.tindie.com/products/ReclaimerLabs/usb-type-c-power-delivery-phy-breakout-board/ this is the breakout board that will pull the full 20 volts out of my macbook charger.

I plan on charging my inmotion electric unicycle - at work, without bringing the huge brick ac/dc power supply.. I will hide all the charging/ boosting circuits ( if one that big exists or can be built) inside the unit itseld, and installing a female usb-c on the unit.

I did this on my bosch electric bike,

I searched mouser and digikey- can't find anything.. Is this possible? 20volts at 90wattsenter image description here is what the macbook/chromebook chargers will push out when they get the proper handshake from the IC chips once you program them in terminal. enter image description here enter image description here

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    \$\begingroup\$ No converter is 100% efficient. A beginner would be lucky to get 90% -- so figure you'd need 100W from you Macbook. If you're generating 80V you're already dealing with lethal voltages -- so why not just look for something that'll plug into the wall and deliver what you want? \$\endgroup\$ – TimWescott Dec 24 '18 at 16:39
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    \$\begingroup\$ Personally, I'd just get another big brick charger and keep it at work. \$\endgroup\$ – TimWescott Dec 24 '18 at 16:39
  • \$\begingroup\$ i'd rather just have it built inside.. I know I can get another brick charger, but its nice to not have them laying around the house.. I have 100% adoption rate in the house of USB-c devices(sans some security cameras permanently installed).. I just want to do it cause its possible.. amazon.com/Converter-Yeeco-Voltage-Transformer-Heatsink/dp/… , but the reviews look terrible \$\endgroup\$ – Kevin Graehl Dec 24 '18 at 16:49
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    \$\begingroup\$ It won’t be at the house - the second one will stay at work.... \$\endgroup\$ – Solar Mike Dec 24 '18 at 17:04
  • \$\begingroup\$ monolithicpower.com/en/mp3430.html \$\endgroup\$ – Kevin Graehl Dec 24 '18 at 17:25

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