Nice that you get some of your power production back from the grid provider. The 20% tariff seems a bit high, but I suppose better than nothing at all. Everyone wants their piece of the pie. Here in Florida, we're lucky to get full price back for our production to the grid. They do however limit it I think to 120% of what your "normal" annual usage rates from them are. Not sure I'll hit that cap with the vehicle charging, but maybe when my driving slows down next month.