w_allen
Posts: 1
Joined: Mon Dec 04, 2017 2:48 pm

Most efficient and compact way to power Rpi3 with solar power

Mon Dec 04, 2017 2:57 pm

Hi all, first post on forum.

I've just got my first Rpi3 model B through the post and really enjoying experimenting so far.

I was hoping someone might be able to help me out. I'm hoping to power it with solar power, i live in the UK so i am aware it will be hard to keep it powered 24/7, but is there a way for it to shut down safely when the charge is low, and then restart and relaunch programs when the charge comes back? therefore being able to leave it to run programs and switch on/off autonomously depending on light levels.

also any idea what power panels would be needed? or how panel power relates to hours of power in a day.
ideally id want the set up to be as small and compact as possible.

thanks
x

ebaierl
Posts: 35
Joined: Wed Jun 01, 2016 10:05 pm
Location: Wherever we happen to be
Contact: Website Facebook Twitter

Re: Most efficient and compact way to power Rpi3 with solar power

Sun Dec 10, 2017 12:42 am

I'm living in an RV, so solar power and limited electric are things I have to pay attention to.

What I would say is get a battery. That way the battery fills up will electricity and feeds it to the Pi, all the while the solar panel is charging the battery. Then you don't have to worry about low voltage ever, assuming you get a large enough battery. With just a straight solar connection though, the volts and amps are going to vary wildly.

User avatar
Gavinmc42
Posts: 3927
Joined: Wed Aug 28, 2013 3:31 am

Re: Most efficient and compact way to power Rpi3 with solar power

Sun Dec 10, 2017 1:52 am

Powering the monitor too?
Some rough calcs have been done in other posts.
For just the powering the Pi3 you may need 20-100w of solar plus battery.

Battery capacity depends on chemistry type, deep discharge capability etc.
I don't think I have found a definitive answer yet.
Maybe we can get some students to runs tests, more input needed?
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

Return to “Other projects”