What's the best way to power a RPi 3B+ in an open field?

My requirement is to put this system out in the field for at least a week without attending it in a stretch. As per basic calculations, the system will require 5.1V * 2.5A * 24h * 7d = 2.142kWh of energy.

What are my options to power this system? Is a power bank (5V/3A) a feasible solution on the long run? I tested it and got a constant "Low voltage" thunderbolt on the screen, which cannot be a good sign, I suspect.

  • @jsotola thank you for pointing out that mistake, I have edited my question. Now that you can finally understand what I mean, do you have a suggestion?
    – peacer
    Commented May 1 at 7:41
  • @Milliways I have added more details on my requirements. Thanks for the tour also. I am aware of the purpose of this forum and that many experts contribute to solving objective problems posted here. However, helping a newbie with your opinion by starting your response with "in my opinion" won't cost you much of your valuable time; at the end of which you could ask them to delete their question (which I will, be assured). If you could guide me to a better forum where I can ask my questions not made felt dumb, I'll be glad to post there.
    – peacer
    Commented May 1 at 8:23
  • @Milliways So basically, in your opinion, there is nothing straight-from-the-market that can be used to overcome the challenge? power supply design is not a suitable question for this site- my question is related to one of the biggest challenges of implementing RPi projects in remote locations, something that tons of people would want to do. I'm no expert but this certainly has got to do something remotely to hardware- which falls under the use of this forum
    – peacer
    Commented May 1 at 8:55
  • Utilizing solar panels to charge a battery bank can provide a sustainable power source. You'll need a solar panel with sufficient wattage to charge the battery efficiently, a charge controller to regulate the charging process, and a battery to store the energy for use during periods of low sunlight.
    – liaifat85
    Commented May 1 at 17:43
  • @liaifat85 thanks a ton! Will look into these. Much appreciated :)
    – peacer
    Commented May 1 at 23:43

1 Answer 1


"Power questions" are very relevant for this site. But this is a poorly thought-out (or very naive) question because no forethought or effort was put into the question before submitting it.

Maybe the first thing to know is that your objective "... to put this system out in the field for at least a week without attending it in a stretch" is not achievable with a "powerbank".

Beyond that you need to do some homework, and revise your question (or delete it). You could start by working up an "energy budget". IOW, you need to know how much energy is required to power your RPi for a week. It's simple enough to calculate:

Energy = Voltage x Current x Time

You can find the Voltage and Current requirements for your RPi 3B+ in the "official documentation"... do the math.

After you've completed this exercise, you can begin shopping for power sources: batteries, solar panels, wind generators, etc, etc. You will need to find energy source(s) that are capable of meeting your energy load (the RPi 3B+) requirement - as calculated from the equation above.

And when you have thought through your objective a bit more, and fleshed out some details, this could become a very interesting, and highly relevant question... a question that might get answers suggesting techniques to reduce the RPi energy consumption to fit within an energy budget. But you'll need to think this through to elevate your post from a brain fart to an actual question. No offense meant by that comment, but if you think through your requirement I'm reasonably sure you'll agree.

  • Ah, I understand what you mean! This makes a lot of sense. As a clueless person who's got a hobby project, this answer is of great value. I have some idea on what thoughts to put into my question now, thanks! Will update soon
    – peacer
    Commented May 1 at 23:28
  • @peacer: That's so good to hear!
    – Seamus
    Commented May 2 at 0:26

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