This isn't a new idea, Edison had it first. Direct current appliances instead of EVERYTHING being alternating current. AC is good for transportation of current, but if your using solar/wind you'd be able to not only avoid a major cost of the inverter, and use the electricity produced more efficiently. Decreasing cost thru the availability of products may help more ppl convert. Who knows, may cost more to pull another line than the cost of an inverter. Ok, this idea sucks, but just seems silly to convert DC to AC to transport it 50feet, then reconvert it back to AC inside the appliance to use it (obviously some electric motors are the exception).
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The reality is most of power consuming the world uses utility power delivered as AC, so mass appliance manufacturers build for that. Those that use self generated power are in the extreme minority.In all things, the minority generally have to conform to the majority, and household appliances is a prime example.
Practically, it is simply easier for minority alternative power users to incorporate an inverter in their system, rather than the majority of utility users rework their billions of installed systems to accommodate DC appliances.
Many, maybe most, people that generate their own power are also tied into the grid. This enables them to use grid power when their system isn't producing enough and feed power back into the grid when they're producing excess. A coverter would be necessary for this.
I think it is more convenient overall to have all appliances comply with a single standard.
yea appliances should accept any voltage source and convert or invert it automaticaly into the needed amount . what you think?
Some appliances, such as lower draw ones, could be made with inputs that could manually or autoconfigure for various power conditions.
Mostly though, it is just easy to build it for the utility power configuration of the region it is sold in, if need be.
For oddball power sources such as DC from an alternative power system, there is just not enough market desire to manufacture the conversion/convertability in (at least as a customer settable option), plus it would add cost to the appliance, costs that the majority of users would not need.