That would annoy me too to be honest!
- Toilet paper with a septic tank - perfectly acceptable request
- Tree fell down - as you say, not really their fault and one of those things
- Solar Panels - not acceptable to have this work going on, especially as the Electric will be on and off during the day. That should have been arranged for a time without people having booked. They ought to give you a refund for the day
They also though should NOT , be interrupting you all the time, with instructions and the like. I've been in several self-catering accommodations, where the instructions for dealing with these are clearly laid out in a book. e.g. the bins need to be put in (x) place on (x) evening/morning and by (x) time. Beds need to be stripped and the bedding/towels etc left (y). Dishwasher should be loaded and switched on for cleaners to empty and put away dishes. Etc etc
To demand a meeting to discuss, and to keep interrupting you trying to enjoy your holiday is completely unacceptable. They are obviously super- anxious about how things are left, and perhaps they have had some bad experiences from previous guests, but that's the risk you take with any kind of holiday accommodation. In the self catering accommodation we have stayed in ( very varied), several owners live close or very close nearby. Most of those would either be there to welcome us and make sure we knew where everything was and how to work everything - or would arrange to come and see us an hour or two after we arrived to do the same. Thereafter, they left us alone, unless we had a problem in which case we could contact them. One owner in particular came down to discuss a problem with the hot water system and stood on the doorstep and asked for permission to come in ( with apologies) to sort the problem. Other owners have done the same thing if they (occasionally) had to come to the door
I would write a very frank review on them when you come back, if I were you - and seek a refund for the Solar Panel day if the facilities you are using are not available/only partly available. Did they TELL you to go out for the day - that would make it even worse, IMO.
I would be furious about this to be honest