I am China controller supplier,Panlongic brand.
When I google in Panlongic,I find this forums,if you have any questions about controller,please leave you message,I will try to help you.
We can supply high quality,reasonable price controller.
We can customize the controllers according to customer needs.
https://www.panlongic.com/products/panlongic-48-72v-1500w-brushless-dc-motor-speed-controller