Not a lot. Mostly twilight with maybe an hour or two of sun at the horizon, but it's getting better every day. We've had (and still have) a ton of snow though, so most of the times what little sun there would be was hidden behind clouds. We had a very long cold streak with -20C and below for...
Quick view of the battery status without having to pop your phone out. Usually I don't have my phone with me, or I have gloves, or my hands are dirty, or forgot the phone again.... I'll probably 3D print a custom enclosure for it and integrate it in my next box design.
Yes. Every time I post a link.
Also comments that reference other sites get removed. For example, any comments on e.g. Andys' videos I make referencing "DIY Solar Forum", "Alibaba/Aliexpress", "Search on ..." etc. get removed automatically. Andy conformed this.
My opinion: your solar array is too small. 5kW of panels (just found that in your first post) with a 19kWh battery with a 12kWh/day consumption. 19.8kWh production - 12kWh use = 7.8kWh reserve on your best day ever.
It's a bit of both. I can't quickly summarize right now, but check this thread starting at the post linked:
This is off topic, but it depends a lot on the temperature. 4000/6000 cycles and whatever are based on 25C operating temperature. If it's 45C, you can half that. Conversely, keeping them at cold temperatures reduces calendar aging.