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solora/hardware/power.md

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BATTERY

  • lipo can charge at 1C
  • 5900mAh -> 5.9A

Strawman design proposal: 1S LiPo, 18650 for easy ubiquitous availability (~3,000 mAh). Add cells in parallel until you get the capacity you want.

CELLS

INR18650-35E

CHARGERS

  1. 5V 2A USB-C
  2. 5V 2A
    • have on hand (i think)
  3. Adjustable
  4. Adafruit 6091
    • $7
    • 5-18V input, USB-C or PV/DC
    • CC at 1.0 A, 0.5 A, or 0.25 A
    • handles LiPo/LiIon or LiFePo cells
    • optional thermistor to reduce charge current when battery overheats
    • schematic

strawman: charging up to 4v with the INR18650 (see CELLS:INR18650-35E for the discharge capacity graph, and CHARGERS:3 for 4V cutoff w/ a 5V panel) gives us ~3000mAh, or 88% of the 3398mAh tested battery life.

BMS

  1. 3S 60A

SOLAR

  • mppt charge controllers:
  1. https://www.amazon.com/Waveshare-Solar-Power-Manager-Regulated/dp/B0CT2ZBML9
  2. https://www.amazon.com/4-4-6-5V-Lithium-Battery-Charger-Controller/dp/B08DY28BXW