solar power on a Pine64 tablet
@Little_Johnny Sorry for not responding earlier. As far as the capacity goes, IIRC it is not indicative of the actual capacity of the battery - it is a static number hard-coded in, so just ignore it. And unfortunately, yes, due to some misconfiguration of the PMIC charge registers, it does not charge anywhere as fast as it could, pretty sure it is around the 500ma-600ma charge mark, so six hours does sound about right...

@Madhuwesly Maximum voltage for VBUS for the AXP803 is 11v, so the 6-7v it'll see from the solar panel sounds like it should be fine. I'd just check the schematic for the sopine compute module to make there is no 5v logic in the VBUS/ACIN path... From the quick look I had at the schematic, it looks like it should be fine - I can't see anything else sharing the DCIN/ACIN voltage lines.

And yes, if a battery is present, the AXP803 will act like a UPS... if there is enough current to run or charge, it will run from the VBUS/ACIN, else it will run from the battery. Or, I should say, that is how the pine64 and pinebook, which are basically the same hardware (A64 processor, AXP803 PMIC, etc) operate.

Messages In This Thread
solar power on a Pine64 tablet - by Little_Johnny - 05-20-2017, 02:48 AM
RE: solar power on a Pine64 tablet - by pfeerick - 05-20-2017, 06:48 PM
RE: solar power on a Pine64 tablet - by pfeerick - 05-20-2017, 09:07 PM
RE: solar power on a Pine64 tablet - by pfeerick - 03-19-2018, 03:51 AM
RE: solar power on a Pine64 tablet - by pfeerick - 03-20-2018, 12:01 AM

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