I’m on a budget and i’m looking to mount a node on a pole in my back yard. I have access to a 3d printer, i have soldering skills, and i’m okay with buying individual components and assembling them myself. I’d like it to look nice but it doesn’t have to if that keeps costs down.
The first goal is reliability, i won’t be able to easily access it once it’s up. The second goal is cheap, i’m on a fairly tight budget. It’s possible the device might be in wifi range where it’s mounted so that would be a nice bonus.
Can you advise what region you live in and where you place the node? I would imagine a lot of places wouldn’t be able to sustain a board on a garden lamp solar panel due to weather conditions and latitude.
I haven’t tested it yet in the field, but according to my USB-measurement device, a heltec t114 used less than a milliwatt (about 50uA at 5V => 0.25mW).
According to a web search I did, the worst you can expect for a cheap solar module is about 10W/m^2. For a small panel with 3cm x 5cm, that’s 161mW.
So, I think it should suffice. But maybe I should solder a bit and actually test my solar-node.
Put I’m hardly the first one to try this.
Edit: So, apparently, 50uA is a bit too optimisic. But some guy on youtube measured it at at 20mA worst case on 3.7V. That’s still 74mW.