jjb I also use Flux and have Growatt, and set my batteries to charge overnight based upon forecasted next day generation and current SOC of the batteries. At the moment there's only one charging period set through Wonderwatt, so it might be worth checking as Gazza has said, what you battery size is, what your base load and high value loads are during the day, and seeing if you can move any of the high usage appliances to the cheaper overnight window. For me, if I see my batteries are getting low a few hours before 4pm, I'll manually set a TOU charging window to charge the battery at standard rate, to avoid the peak rate via the Shinephone App or via the Growatt Server Website which will then see me through the peak period. It's manual obviously, but while the Wonderwatt team work on adding features for multiple charge windows, this could be a workaround for you.
