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Try adding step down transformer to the circuit the 28v will lower to about 5v and the amp will increase. Also you should have added a diode bridge, it would basically double your power output. let me know how the transformer worked and have a nice time people:)
I am confused with the reaction plate arrangement. your system has 16 plates exclusive of the connector plates; but according to the washer and bolt setup you show in the video only 2 plates get positive and 2 plates get negative connection from the battery. Is it supposed to be like that? What is the use of the remaining plates? Are they just to increase the surface area for the system?