solar power on a Pine64 tablet
(05-20-2017, 02:48 AM)Little_Johnny Wrote: im making a Pine64 tablet with a c4 labs screen case, i want to put a 5v solar panel with a 5v 2A voltage regulator on the back to charge the 3.7V Li ion battery, im thinking about using a usb plug from the voltage regulator to the pine64 board, my questions are is this possible and do i have the voltage and amps correct to charge?

What sort of solar panel... is it one of these fold out ones with built in USB sockets? If so, skip the next paragraph, which focused on a self-build system. One of things you didn't explain though was what sort of useage was this tablet going to get, which will dictate how much charge it will need. If it's something like an hour or two of use a day, and it being off the rest of the time... then this might actually be practical, even on a cloudy day. 

Your volts and amps are indeed right to provide the 5v to the pine64 to power it and charge the battery via the microUSB port or DC_IN euler pins, but my question would be although you have a 2A capable regulator... what is the amperage of your solar panel, and will it provide say at least 1A at 5v. If you're cheating and using a voltage regulator instead of a proper solar management system, the solar panel needs to be a higher voltage, say a 9-12v panel, and your buck regulator able to accept that as the input voltage. Then you might have more luck. As things stand at the moment, you would be rely on the solar panel to be putting out more than 5v so the regulator has the overhead voltage it needs (to get 5v of a switching regulator, unless it is a hybrid linear/switching or passthrough capable regulator, it needs more than 5v in). 

As Macrus suggested, you would probably be better off with a 12v system... as you can get small 12v panels really cheap (20w should just about do it, although 40w would be better - more is better, especially for overcast days), and then use a charge controller and a SLA/car battery. Bigger and bulkier, but the best way if you want reliable solar power. But obviously won't be fitting onto the back of the pine64 case.

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

Possibly Related Threads…
Thread Author Replies Views Last Post
  Which Power Supply Unit for Pine64 A64 DB V1.1 2GB REV B (year 2016)? databaseprogrammer 1 555 07-03-2021, 01:29 AM
Last Post: tllim
Lightbulb Alternate Power DC-IN on the Euler Bus also with PI filter for batt operation MarkHaysHarris777 13 15,448 12-19-2020, 09:53 PM
Last Post: evilpete
  Once Again: Power Supply problems I guess (Pine A64+ locking up) marcelser 0 2,102 06-04-2018, 03:11 PM
Last Post: marcelser
  Power supply problems. larsen8989 5 4,429 05-03-2018, 09:01 PM
Last Post: tllim
  Power up HDDs c4tich 3 3,057 03-18-2017, 09:18 AM
Last Post: Luke
  Provide power in via Pi-2 header BenCranston 22 14,486 03-08-2017, 10:38 PM
Last Post: pfeerick
  any danger from using 2 power sources at same time? dkryder 3 3,406 01-20-2017, 10:45 PM
Last Post: MarkHaysHarris777
Lightbulb A Tale of Two Power Supplies - why good is good and better is best MarkHaysHarris777 9 10,312 01-07-2017, 11:59 PM
Last Post: aegrotatio
  First cable for Euler Bus power done! AVL2016 24 16,330 10-05-2016, 06:43 AM
Last Post: Ghost
  Fuse in the AC power line? cr2016 3 3,430 10-02-2016, 04:35 AM
Last Post: pfeerick

Forum Jump:

Users browsing this thread: 1 Guest(s)