“The difference between learning curves and experience curves is that learning curves only consider time of production (only in terms of labour costs), while experience curve is a broader phenomenon related to the total output of any function such as manufacturing, marketing, or distribution”

looking for data of experience curves on Electrolysis I found this

on this paper on cost trajectories of main electricity storage technologies

this article states 20% learning rate per doubling of production, similar to wind https://about.bnef.com/blog/liebreich-separating-hype-from-hydrogen-part-one-the-supply-side/