yes i have read through that link before , but its not the path(s) i will be trying to follow---making any type of battery requires high quality purified chemicals as electrolytes , same goes for the metals for anodes/cathodes ,and the housing/container to be rugged and suitable---for redox batteries its the ion membrane needs high quality as well---which i think why most of the attempts at diy builds seem to fail ---contamination just poisons the reactions-- as most of the pure components are expensive or too exotic/difficult to source ---hence the small prototypes and limited lifespans of many---i have collected the basics of materials required to build one , 100 liter cell---at a reasonable cost ---i think---for my purposes and expectations--but its not a true cost/outlay ---as some of the stuff i had to hand already---but only for one cell ---maybe two---but enough to complete these ---allowing for one to be a failure--then on to measuring in put/out put afterwards---and then next stage of sourcing solar panels ---to then justify going further--