Starting a new thread about voltage regulation with this same post:
Have had no luck finding a low voltage ac full sine wave voltage regulator device. However for an industrial transformer option, here is an interesting possibility with a $980 price tag for the enclosed version, about $200 less if you buy open and make your own enclosure for it. The key spec is an output voltage drop of only 0.8v at full 15a load when the output is set to 20v (would be ~same at 19v.) Curious about other manufacturers/sources/prices if someone has knowledge.
Product link: https://iseinc.com/_shop/1510c...ls-tab-specification
Link to technical specs which include V drop at various output V settings (see “1510” Type in table): https://iseinc.com/_shop/1510c...ls-tab-specification