You're drawing a ton of current.
The latest equivalent of the TPC 400 is the Legacy Powermaster 360. Same idea, but better.
Whether you use the TPC 400, or the Legacy Powermaster 360, you get the same functionality (for the most part) as one of the throttles on the ZW-L but you get 360 watts instead of 180.
Unfortunately you also get no throttle lever. With these you need to use the controls on a CAB2 handheld (or CAB1L) through a Legacy Base to control the throttle.
Mike