Yes your link worked
You had 19 pics posted but only about 1/2 were original. The rest were repeats for some reason?
Your boxes look very nice. You have obviously put a LOT of work into them ...I'm impressed! Not many people have the fortitude to do this kind of "dirty" work. -I on the other hand love it and would have it no other way. I'd never be able to just sit by and read. I have to build the stuff for myself.
Now let's attack your problems. If you're sure it's not electrolyte or spacing, then it can only be 1 other thing ...your power input. I have not messed with the inverters much at all. Most everything I do at 120v is straight from the wall, through a hefty
Full Wave Bridge Rectifier.
I will say this, unless your inverter is HUGE, you're only going to be able to push maybe 5 amps through it at maximum. The thing will probably want to push just 2 or 3 to stay happy. That in itself could seriously reduce or rather restrict your output.
Did you try ...just for the hell of it, hooking a heavy full wave bridge rectifier into your setup? Please put a fuse or breaker (10 - 15amps) in line BEFORE the rectifier on the HOT side of your AC.
If you want to eliminate your inverter as a variable. Just use 10 - 14 plates together in a series and use a 12v car battery as the power supply. That should show you exactly what it will do at 120v with 10x more plates in your current configuration.
I always try to urge people to start small, with the 12v versions.
So can you get some more pics of your unit in action?
Ohhhhhhh I almost forgot. The pics are hard to make out but it looks like you have 2 supports under the ends of your long electrolyzer box. Dude you are going to crack that thing in a hurry. You need RUNNERS along the entire length of the bottom to support the weight evenly.
If you dont' have that, kiss that box goodbye after 2 weeks of use. The heat and weight will rip it apart. By runners I mean stable support along the whole length of the bottom. -Like runners on a child's sled.