I'm attempting to convert 200v - 270v DC to 120v DC with the core goal to have as little loss as possible. I've been reading about voltage regulators but they all seem to have some loss however there are scientific articles about certain designs which are shown to have far less than average. As the articles are not new, I was hoping someone knew of a product or design I could buy/order. (2. ) Is there a product that could take the used or unused power from the conversion and store it into an array of capacitors that could somehow be used efficiently for the load and/or use the remainder elsewhere?