The miner will have free solar + very cheap grid electricity but regular power cuts, so I was wondering if anyone had experience with the miner switching off at least once per day for a few hours. The environment will also be quite high humidity. Will this make my project completely unfeasible, or can Antminers handle this?
To switch the miner on and of regularly does not affect it at all. I have miners that are used as heaters and they are turned on and of several times per day. Also rental miners turn on and Off, depending if they are rented or not.
The humidity could be more of an issue, but from what I have heard bitcoin miners are operated in every climate zone of the world and often even in warehouses/shipping containers where there is also a high humidity.