Thank you both for your responses. As a matter of fact, before considering this scheme I searched online until I was able to find the formula to calculate the quantity of HHO gas emitted by lead-acid cells during a charging cycle. Not too easy to find, but I discovered it in a battery...
I've considered doing just that with excess energy from the photovoltaic array. However, my objective is to learn whether an energy stream which is usually wasted can be saved for later use, perhaps as one resource among others to bridge the "January Gap" when photovoltaic output is low and...
I'm would like to learn of the practicality of separating HHO gas released from a photovoltaic charged lead-acid battery bank for hydrogen storage, perhaps by exploiting the substantial difference in density of the two elemental gases.
It occurred to me that were the gas emitted from batteries...