wpns
Solar Joules are catch and release
So the other thread has me thinking again about a beacon for night-time boating, and a single LFP cell for under $100 could support a 35ma average load for a _year_, and running pulsed at night isn’t totally unreasonable. Then, of course, adding a small solar panel (even a watt or two) could extend the power budget significantly. (There’s always feature creep!)
Multiple cells obviously requires a BMS, which adds complexity. If you just had one cell and a low power micro that would not allow charging above 3.65 V or discharging below 2.5 V, would that be sufficient?
Something like https://www.ledsupply.com/leds/cree-xlamp-xp-e2-color-high-power-led-star would seem to work (for red anyway) on a single cell.
I’d have to sit down at a real computer, but a 314 amp power cell doesn’t have an unreasonable power budget if run for a year. Or does it, what’s the self discharge rate of LFP at an average of 80°F?
Multiple cells obviously requires a BMS, which adds complexity. If you just had one cell and a low power micro that would not allow charging above 3.65 V or discharging below 2.5 V, would that be sufficient?
Something like https://www.ledsupply.com/leds/cree-xlamp-xp-e2-color-high-power-led-star would seem to work (for red anyway) on a single cell.
I’d have to sit down at a real computer, but a 314 amp power cell doesn’t have an unreasonable power budget if run for a year. Or does it, what’s the self discharge rate of LFP at an average of 80°F?
but I thought I read that self discharge is < 2% per month.
