I too have had many a beautiful sunrise and sunset destroyed by gennies (even the silent Honda ones

), sometimes by people doing something as mundane, routine and as easy as boiling a cup of tea!
If you need to charge batteries... sure, I get that, but do it between 11am and 1pm when most outdoorsy people are bushwalking or surfing or swimming, and there is less chance of disturbing anyone else.
If you absolutely, hand-on-heart, cross-my-fingers, pray-to-god NEED to run a gennie any longer, you need to reconsider your hardware and/or the advice you have "researched".
Or maybe a holiday house would be more suitable.