jim wrote:
12VDC is appropriate for places that don't have other electrical supplies. these places include automobiles and boats as well as remote regions that use windmills, creekmills, solar panels, car batteries, and deep discharge gel batteries, possibly in a mix. typically there's noise and variant voltage levels above the nominal 12VDC; any system should be designed to work with spikes, noise, and higher voltages--most are as a matter of course.
and, of course, you need 10 times the amperage at 12V... For instance, a 250 watt system that would draw about 2 amps at 120V will be drawing 20 amps at 12V. this means that you need much heavier gauge power wiring, especially for long runs.
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