“this solar-powered device operates without an external power source”
Read that again. Take as much time as you need.
🙄...................
My.solar panels don’t have a external source....unless you consider the giant thermonuclear reactor in the sky as external I call it a remote source of energy since it is 93+ million miles away it certainly qualifies as remote.
Right now that great fireball is making 25kw I’m using 4 and the rest is putting money in the bank account in real time.