Hello im Just wondering about buying used Kelly Opto isolated from ebay for $400 klc 14601 model for my new project with Qs 273 motor and 3x16s lifepo4 it will be working at three voltages 52.3v 104v and 156v up to battery 128amp, and Phase up to 300amp. I have a question.its a good idea or should i buy a another different controller? For my is Long time using without problems is more important than $2000 super cool newest not checked controller