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Photovoltaics (PV) are any '''solar panels''' that produce electricity. | Photovoltaics (PV) are any '''solar panels''' that produce electricity. | ||
<!-- I bolded "solar panels" instead of "photovoltaics", because plenty of new readers have never heard the word "photovoltaics" before. [[Solar panels]] redirects here. --> | |||
<!--: {{minor|''Not to be confused with [[solar thermal panels]] (non-electric) which just heat air or water in the sun.''}}--> | <!--: {{minor|''Not to be confused with [[solar thermal panels]] (non-electric) which just heat air or water in the sun.''}}--> | ||
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*** [[sodium-sulfur batteries]] | *** [[sodium-sulfur batteries]] | ||
*** [[sodium-ion batteries]] | *** [[sodium-ion batteries]] | ||
*** {{light| | *** {{light|These battery types (above) are not on the market yet. Innovations are needed.}} | ||
* ''Some'' excess summer daytime energy may be worth storing by producing [[hydrogen gas]] (which could be burned in the winter for [[heating]]). | * ''Some'' excess summer daytime energy may be worth storing by producing [[hydrogen gas]] (which could be burned in the winter for [[heating]]). | ||
* To reduce the need for energy storage, it would help if people were to charge their [[electric vehicles]] mostly during the day, and if factories were to run only during the day (and maybe even temporarily shut down in the winter). <sup>[new economics needed]</sup> | * To reduce the need for energy storage, it would help if people were to charge their [[electric vehicles]] mostly during the day, and if factories were to run only during the day (and maybe even temporarily shut down in the winter). <sup>[new economics needed]</sup> | ||
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In general, | In general, rooftop solar can almost always provide enough ''electricity'' for a house (and even charge an [[EV]] in many cases), but not always enough [[heating]]. | ||
{{minor|Burning [[hydrogen gas]] (generated from [[wind]] power) could probably make up the difference.}} | {{minor|For heating: Burning [[hydrogen gas]] (generated from [[wind]] power) could probably make up the difference.}} | ||
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Compared to [[wind power]], solar is far less land-intensive {{x|about 50x less, based on the fact that the atmosphere converts about 2% of the sun's energy (that hits the Earth) into winds}} but far more invasive to the land it ''does'' use. | Compared to [[wind power]], solar is far less land-intensive {{x|about 50x less, based on the fact that the atmosphere converts about 2% of the sun's energy (that hits the Earth) into winds}} but far more invasive to the land it ''does'' use. So [[rooftop solar]] should come first, as much as possible. | ||
==See also== | ==See also== | ||
* [[Solar thermal panels]] - {{light|Not electric | * [[Solar thermal panels]] - {{light|Not electric. Only for heating water & air.<!--[[hot water|water]] and [[heating|air]].-->}} | ||
* [[Concentrated solar thermal]] | * [[Concentrated solar thermal]] | ||
* [[Concentrator photovoltaics]] | * [[Concentrator photovoltaics]] | ||