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Even on ideal conditions (close to the Equator, no clouds) like in Northeast Brazil, you only get 5.5 to 6.0 kWh/m^2 of Solar energy, which means the roof of a small car, with 1 m^2 of solar panels, would only generate that amount of electricity if they were 100% efficient. That’s just 10% of the battery capacity of a small EV, like a BYD Dolphin.
My point is, even if solar panels doubled their efficiency, they would still only capture about half the energy of the Sun (currently, the best panels are at 24% efficiency), which means only about 2.5 to 3.0 kWh per day.
And that’s you problem right there. The same people that can get tricked into revealing their SN#, mother’s maiden name, etc. are the ones who would reveal their private keys to a scammer.
Fraud is a social problem, technology can assist in managing them, but not solve the issue. In the end, it’s all about the human factor.