...too late to edit, but the comment I was trying to bring attention to [0] has ...

...too late to edit, but the comment I was trying to bring attention to [0] has received a response by another founder in re power, and the 15w advertised is actually a 17.5w supply [1], according to the parts list of the DIY edition on the Kickstarter page [2], which is apparently enough to supply everything consistently.