NB POWER 36V/48V 500W 25A Brushless DC Motor Controller Ebike Controller +KT-LCD8H Color Display One Set，Used for 500W Ebike Kit.

So, this was kinda expensive, but well worth the investment. Upgraded my Super73 Z1 from its original controller 36v 11ah Purchased this set 48v 22ah as upgrade. Purchased 48v 20ah battery to match controller voltage, too. Controller and display are great but….I ended up burning out a MOSFET. I contacted company for replacement since I was still under warranty. Company did not have a 48v 22ah in stock at time so they offered to UPGRADE my replacement with a 48v 30ah controller. Only had to pay $20 shipping. I don’t think I will ever go back to anything less than 48v 30ah for a controller. I thought 48v 22ah was powerful. The speed and takeoff are even more amazing with 48v 30ah controller. You can see the difference in size of controller with just a few more amp hours added. But boy what a difference! (Pic bottom image 22ah controller; top image 30ah controller) They don’t sell the 48v 30ah controller on Amazon, but if you email them when u make your purchase, you can upgrade. And I strongly urge you to. 48v 30ah has to be experienced to believe!! Matter of fact, 48v 30ah controller is so much better than 48v 22 ah that comes with order (which definitely ain’t bad) that I ordered a second set and paid full price for upgraded controller and display ($139 + $20 upgrade fee) to have when I build/mod my next ebike. Well worth the money, imo. Hope this review helps. /Bklyn👑