I think there is going to be big market coming for the plug in solar capability. Is Elan Musk busy these days?
Depending on where and how you use them, you may be ok. However, once you start tweaking to your specific needs, you have to anticipate ‘depreciating returns’.
In theory (disclaimer: nowhere near scientific)
Based on the purported battery life,the expected life of the battery is 40,000 seconds, that is about 55 seconds per day over 2 years.
Based on very basic settings, this the guestimate of the average number of clips per day until the batteries are exhausted (your mileage may vary):
In reality, odds are no two users will be the same, and there are bunch of other variables not even included in this such as End Clip Early, Re-trigger time, sensitivity, etc. some days it will trigger a lot, some days not much if at all
Plus, how much you play with settings, locations, etc. will all impact the battery life.
It’s like when you fill you car’s gas tank, and it says 522 miles till empty. It ain’t 522 miles till empty because there are variables.
Going back to my initial statement, this is battery operated device, you are going to be buying batteries.
It is still a very easy and inexpensive system