Scoby, TCT cutters are good, but you do need at least a 750W drill to be effective, and that is only on a 100mm cutter.
If you increase the cutter to 125mm or 150mm, then you really do need a 1000W or better.
We have a 1350W Bosch that is designed for core drilling, even that struggles occasionaly with the big cutters, depending on the material being cut.