Is my crypto mining idea ok or not?

Hey guys. I'm new to a cryptomining, but have solar plant with a 15kWh battery. So electricity price is from 0 Eur to 0.07Eur/kWh when I don't produce it. Avalon Mini 3 Home - 37.5TH/s and 800 watts. Cryptocurrency Digibyte - DGB, current price 0.005Eur, block reward 280 BDGs. Crypto calculator shows that it's possible to get 3 blocks per day on average. So it's like 4.2Eur per day. I can't find any other currency which earn more than 1.5Eur per day. What do you think? Maybe there's some mistakes in my calculation?