Tbh, I wouldn't advise you using a CH650 or worse, a 750 Cruzer. These two may be too much for the system and make it go overload. But then again, if anything goes wrong you can always call for a local cheap aircon servicing and get them to fix it. Even though they aren't the best, most of the time, they can get things done. However, it's absolutely not advisable making the system go overload. It may be extremely dangerous, so think through this carefully, will you?