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Yea, DC distribution in data centers makes sense. There you can run Heavy current wires etc. with in the room. But if you think about it, Long Haul for DC can be as far as the next room depending on usage. That is unless you want to run extra, heavy gauge, wires along with your "thinner" AC wires.
For Solar, it all depends if you want to be on the grid or not. Most solar installations (here in California) are done on the grid to take advantage of tiered energy prices. It is unfortunate, but that is the way the solar business works.
OF course if you are into solar to be the best environmentalist, DC to DC conversions are generally more efficient.
Yea, DC distribution in data centers makes sense. There you can run Heavy current wires etc. with in the room. But if you think about it, Long Haul for DC can be as far as the next room depending on usage. That is unless you want to run extra, heavy gauge, wires along with your "thinner" AC wires.
Actually, DC may be more efficient than AC for local power distribution with today's silicone power devices.
Regarding solar panels - the output is irregular - the voltage changes depending on how much light is hitting the panels. So you will need some sort of interface box that does "buck/boost" type things to equalize voltage. So you already have a big box full of electronics - inverting to AC is just another function to add.
Thickness of wire has nothing to do with direct or alternating current. You don't need thicker wires to run 120V DC system, than what's used for traditional 120V AC. Are you thinking of 48V system when you say DC ?
Yup - for my house, I would pull off the batteries instead of directly off the Solar for that reason.
Another good thing about AC is that shocks don't cause your muscles to tense up and clamp down on the wire leaving you unable to let go.
I'm hugely impressed by Nikola Tesla's AC superpower system that powers today's world. However the advantage of AC was the ability to use transformers to step voltage up for long-haul transmission. Nowadays there is a high voltage DC alternative that is even more efficient:
High-voltage direct current - Wikipedia, the free encyclopedia
GSP
For safety, the definition of high voltage for consumers is any thing greater than 50V. Saying low voltage implies 48 or lower.
And here they say:Identify and secure suitable standard (110V) electric outlets for charging low voltage EVs in every government building in 2009
(according to the NEC, "high voltage" is 600V+)Definition of National Electric Code (NEC) low voltage: as defined by the NEC, voltage between 50 and 600 V. [SEMI S2-91]
Having been shocked by many voltages, I definitely prefer AC.