i mean if you know anything about electicity it should be pretty clear that he's not putting that kind of power into this, desalination is REALLY energy intensive.

also it's kinda irrelevant since you can't desalinate water you don't have..

I watched the video yesterday and it looks like he’s using wires that are no more than 18 gauge.

18 gauge wire can handle about a maximum of 14 amps, but I don’t think he was coming close to that. He was generating 35kV (I think - he had a few prototypes he gave stats for) off a battery pack.
I don’t really know the math, but it’s an inverse relationship if your power level is fixed. The battery pack can only deliver so much constant power, so it’s either high amps and low volts, or high volts and low amps. (Unless you put capacitors into the mix, but then it’s not constant power.)

getting electricity at dawn is hard because solar panels don't work.

I suspect the fog might be an issue as well.