We had good weather for once, so I went for a reasonably long (43km or so) bike ride and then climbed [a very small mountain] (https://www.doc.govt.nz/parks-and-recreation/places-to-go/auckland/places/mount-william-area/tracks/mount-william-walkway/) that we’ve been meaning to check out for a while.
The solar/battery models don’t run 24/7 - you can trigger them remotely (so you can check the live feed whenever) or they can trigger with motion. Still perfectly useful for a bunch of use cases (e.g. just checking if you closed something, or installed somewhere that motion sensing is reliable like a low-traffic corridor) but not super useful for, say, a front door.