If you look at the screenshot, it tried to intelligently postpone the charging until these times. I assume if it can't find a time it will just charge with dirty far-right White male energy. I thought that night time was the best time to charge things and put general loads because there tends to be less grid demand then, but because the grid can't reduce capacity that much a significant portion just goes to waste. So the time people usually charge it is already probably the most reasonable.