Check out the link. Is it a sine wave controller? It says it has 18 mosfets.
https://www.ebay.com/itm/48V-DC-1500W-Brushless-Motor-Controller-For-E-bike-Scooter-Electric-Bicycle-US/252876629480?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D41375%26meid%3D11efef2b9fd1424eacc3e2c8a7dd3b86%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D371731938464&_trksid=p2047675.c100005.m1851
https://www.ebay.com/itm/48V-DC-1500W-Brushless-Motor-Controller-For-E-bike-Scooter-Electric-Bicycle-US/252876629480?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D41375%26meid%3D11efef2b9fd1424eacc3e2c8a7dd3b86%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D371731938464&_trksid=p2047675.c100005.m1851