3A USB powerbank with GPS/SD datalogger
Update 03/09/15: Realised I had made a couple of mistakes or suffered a few oversights, so, no fab for this, ifidosaysomyself sweet looking board, at least until I figure out how to fix it without too much of a hassle:
- The LTC4150 Gas Gauge is μC interrupt based, so no standalone, relying too much on my max 100.000 cycle Atmega644 EEPROM. Other less fatiguing IC options are available (LTC2943?)
- The LT3652 multicell MPPT Lithium charger maxxes out at 2A charge rate, with a planned 30.000mAh battery pack, it’s just not going to cut it… 15hrs charge time excluding charge rate tapering… Still, a sweet ‘n simple MPPT charging IC though. Forget Solar MPPT, nice idea but unpractical for the massive-powerbank-minded. Hope to implement it in a less bulky bit of kit in the future (2-axis solar tracking, 3 x 750mA panel, collapsible, 10.000mAh travel powerbank?). On a side note: What is this graphene malarkey i’ve been hearing about…
- No powerpath management. Must. read. more. Stackexchange: Link
- No cell balancing. Some experience with multicell charging lead me to believe balancing, with well selected cells, is not necessary… Wrong.