They are quite large, but in the particular application weight and volume are not a huge concern. All sitting side by side they are about 20 meters long, 3 meters high, and a meter deep. Probably weighs on the order of 15 tonnes.
Wow, how much capacitance is that?
16.3 megafarads, assuming typical cell voltage of 2.7v, and total energy of 33kWh: