Those are pretty skinny tires!
For effective braking performance at the speeds you`ll be travelling and with the extra weight of a battery and motor you should be looking at 26 x 1.75 tires minimum.
Both Schwalbe and Kenda make ebike ready tires. You might want to look up some reputable companies that are marketing complete bikes, not kits, and have a look at what they`re putting on their bikes.