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Charging

Made with KiCAD

NOTE: You can just plug into any usb outlet instead of portable charger. Portable charger is meant for if car battery is still in car not near outlet.

Setup

  • Battery phone bank: 5 volt output
  • 13.5 -> 14.4 volts

Charging

Check current battery voltage

  • if under 10.5v, its damaged
  • full charge sets at 12.6/12.8 volts when car off

Charging rate

  • Set boost module to output 13.2-13.8 volts
    • should charge in roughly 3 days, 40 hours
  • Normal charges charge at 14.2-14.4 volts, but automatically drop to 13.6 when charged at 80% charge
    • I'm not doing that so just charge slow...

Wiring

Only 2 pairs of Black/Red wires needed

  • Positive/Negative from usb output of Portable Charger
    • Goes to input of Boost Module
  • Boost Module output to Positive/Negative of the Battery

USB A 2.0 (no data transfer):

NOTE: 3.0 has 5 pins for RxTx (UART serial) data transfer in addition to the normal D-D+ USB Differential Pair.

  • The old protocol is more complex because data is transferred back and forth on the same line

Equipment

Battery

  • 30,000 mAh

Portable Charger

Step Up Boost Module

  • $2
  • Input: 4.5-32V
  • Adjustable output: 5-52V
  • Step-up Voltage Regulator With LED Voltmeter
  • https://www.aliexpress.us/item/3256805948691694.html?
  • Max input 4 amps
  • 85% effieiency
  • Button Press
    • short press: input/output
    • medium press: change offset to zero voltage?
    • long press: low power consumption? lights out, press again to restore
  • Nob
    • voltage output change