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Would these step up transformers have enough amperage to handle the power demands? What if all 4 windows were used at once, that's something to consider.
That is a big consideration and the answer is no, I don't think so. That's why on the other thread I suggested a look into that 6 to 12v inverter you found at Newport Engineering for the wiper motors. That is rated 5 amp and would handle 1 door, possibly 2, IF the max draw of the actuators that probably would be used is correct as stated on the website--roughly 3amp. Suggested if doing it that way, 1 per door would be needed. Of course, that adds an extra $150 per window. It would eliminate the need for a full conversion and could be isolated from rest of electrics. While a full conversion has it's merits, the poster has requested a 6v solution and I can understand why they may choose not to go the full route.
Before committing to that approach though, would still like confirmation that the inverters would work directly with motors. That inverter website is just a bit ambiguous and never directly states they will--even though sold in the wiper accessories section. Would like to know a bit more about any limits on the "heavy load" output since other inverter sites state specifically theirs are not for use with motors.
I think the best way if completely converting all windows would be to have a small battery as O_D mentioned others have done. The associated components could be hidden, protected, disguised -- maybe in the space the existing pump is located. Use an inverter and a circuit to keep the battery charged. Doing it that way, would eliminate any question, give some reserve, and could still be isolated from rest of car.
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