Supercapacitor best practices


#1

(Apologies for my electrical newbieness)

For my application, after loss of USB power I need the Dash to stay alive long enough to send a single “power lost” message. Easy, just plug in a small Li-ion battery. Except it might be many months, even a year, before external power is restored. So I’m looking at a supercapacitor instead, since it’s fine even after sitting fully discharged.

Questions:

  1. Is this the wrong approach?
  2. What’s the right place to connect it? The normal battery connector (thus running through the charge controller)? Direct to Vin?
  3. Any specific part recommendations? I’m happy to overbuild it a bit.
  4. How do I account for the internal resistance of the capacitor, system minimum voltage requirements, and transmitter power draw?

#2

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