Just a crazy idea.
If the Sun was pulsating energy out at a constant freq of 50/60 Hz then our Solar panels would generate AC , NO need for inverters.
Even if the Sun were to emit energy at a constant frequency, solar panels would still generate DC electricity due to the nature of the photovoltaic effect (When photons strike the solar cells, they excite electrons and create an electric current in one direction) and the design of solar cells. Inverters would still be necessary to convert this DC electricity into the AC electricity..
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Yes with our current Solar panels , but our panels would be build different.
So you think you can design solar panels that ignore the laws of physics then. Good luck with that.
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how about to build an AC battery? 
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No.
You would get a pulsating DC output - as from a rectifier (with no smoothing).
To get AC, the sun would have to alternately send out light, and then suck it back in again - ie, it would have to alternate emitting photons and "negative photons" (darkons?).
Ah , there you go already got a new definition DARKONS I like it.
The energy from the Sun will pulsate in waves (like a sine wave), the positive wave is PHOTONS and the negative wave is DARKONS.
Good joke 
Just like the Anode Ray oscilloscope.
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Light has a wavelength which means it is "AC". 
Some quick Internet research says the middle of the visible range (about 600nm) is about 500 terahertz.
You could modulate the light at 50/60Hz but you can't get negative light.
However, it just takes a capacitor to convert biased AC (that never goes negative) to normal AC. That's done everyday with audio.
Even with AC you'd still need a voltage regulator and an AC voltage regulator isn't that much simpler than a regulated DC-to-AC converter... In fact it might be more complicated...
It would have to be either one or the other!
So, to be useful, we'd have to all decide to use either 50 or 60 Hz.
But it'd keep all our grids synchronised ...
Converter for the any star's A/C.
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Wow , we had that in the science class way back in school.
If you let your eyes defocus you can control the direction it rotates.
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Easy! Just have electrodes made of alternating layers of different metals so sometimes it's one way, sometimes the other, as the layers corrode away.
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