According to the graph on p.13 in Hubler’s paper, the predicted energy densities range from 0,5 MJ/kilo to 1,5 MJ/kilo.

1 MJ corresponds to 278/Wh. Astonishing for a capacitor but hardly any tenfold improvements in energy density when compared to current battery technology. Even less so when taking into account a container able to keep theese things in the hard vacuum they need to function as forecasted.

The answer depends on the fusing or breakers, if the caps are individually fused, it’d be like shorting across the terminals with a screwdriver.  A big cap might melt some of the terminal or the driver.  The spark, if there is one won’t last long.  Down circuits again, should be fused so the combined caps could flow, thus more spark.  Depending on the sizes, the circuit fuse will blow or the individual cap fuses would blow.  Fused right, not much is going to happen.

A crushed cap, say a terminal goes to the case would offload to the ground of the case which should ground some way to earth.  If I were an ER tech, I’d walk up on one with an insulated grounding tool first thing.  The volts might not be too high but the amps could be quite substantial spark, like a big DC welder.  I’d rather try to handle a set of caps than batteries, no explosions, long term hot or toxic materials, etc.  Batteries take more time, nastier chemicals, etc.

Stored electrons seems lots safer than liquid or compressed gas fuels. But that’s just me.

BW

JPS