ISB Sola Basic advice?

Every city in Mexico has a privately owned repair shop that specialized in motors for CONGLEADORES COMERCIALES Y POZOS (Freezers and Wells). They all have voltage conditioners of various makes and models. Their "usual" inventory is for 20 amperes 127 vac which is the CFE national standard NOM for Mexico. I would not buy Chinese. Most of the better made in Mexico models have thick circuit boards, heavy top soldered beads on the power circuits, and decent quality components. The 20 ampere units I have are wired with three prong plugs and a single 120vac grounded receptacle. Boosting is staged. These shops are listed in the telephone directory yellow pages seccion amarilla, and any electrical hardware store can steer you to one.

I brought down a 5Kw Sola line tamer that is ferroresonant and bucks or boosts from 72 to 160 volts linerarly. No steps. You do not want to know what this thing eats just sitting there idling. It weighs >200lbs.