I have a device that uses a 555 timer, a couple of pots and an autotransformer (car engine coil); it can go to blow-out frequencies and about 40,000 volts using two nine volt batteries. I couldn't electrocute a cockroach.
A 480 gallon bucket is going to weigh a lot more than an 18 gallon bucket, but it is the raincoat that keeps you from getting wet.
I think we will leave it at that.