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Old 30-07-2015, 08:11   #1
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Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Will be nice for us when we get cheaper 12v appliances!

https://translate.google.co.uk/trans...-text=&act=url
Sharp has succeeded in commercialization of powered by electricity "DC consumer electronics" of the generator that produces direct current with the housing, such as solar panels (DC).
DC appliances, the direct current of electricity, alternating current flowing through the housing of wiring (AC) does not need to be converted to electricity, is reduced power loss during conversion. It has been noted as "energy-saving appliances of the next generation", Sharp is the end of the year, to launch the world's first DC-enabled air conditioning.
The current from the transmission and distribution wires to the home of the outlet, all electric alternating current is flowing. and solar panels spread advances, household fuel cell "ENE-FARM" to make electricity and hot water using, such as city gas, a direct current of electricity generated is converted into alternating current through the power conditioner, the electrical wiring in the home and send to that, but that this time 5% or more of the power loss occurs.
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Old 30-07-2015, 08:22   #2
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Haha, google translate sucks. Is Sharp unaware that there have been 12 volt aircons out for a long time?
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Old 30-07-2015, 08:45   #3
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

But don't count on running them from your batteries, they consume a lot of power.
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Old 30-07-2015, 08:50   #4
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Most fitting response I can think of:

COOL!
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Old 30-07-2015, 08:53   #5
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

This article seems to indicate they would use 100V DC for Home solar installations. I suspect we will see more of this and eventually we will see a high voltage DC standard for server farms and off grid stuff. Before I have heard alot of 48VDC as a standard talk, as it avoids many issues and counts as low voltage for a lot of standards. This is the first time I've seen 100VDC put out as a potential standard.

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Old 31-07-2015, 08:40   #6
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

This sounds interesting theoretically, since the application of electricity began by Mr. Edison himself as DC. But it suffered from big current drops in distances longer than 25 yards,thus unusable for city usage. It was Tesla that introduced AC and the result is the grid we all depend on today. So dream all you want about DC but it will never work unless some other genius figures out a better mousetrap.
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Old 31-07-2015, 08:59   #7
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Quote:
Originally Posted by sailon46 View Post
This sounds interesting theoretically, since the application of electricity began by Mr. Edison himself as DC. But it suffered from big current drops in distances longer than 25 yards,thus unusable for city usage. It was Tesla that introduced AC and the result is the grid we all depend on today. So dream all you want about DC but it will never work unless some other genius figures out a better mousetrap.
Most homes are within 25 yards of their roof.
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Old 31-07-2015, 09:00   #8
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Quote:
Originally Posted by sailon46 View Post
This sounds interesting theoretically, since the application of electricity began by Mr. Edison himself as DC. But it suffered from big current drops in distances longer than 25 yards,thus unusable for city usage. It was Tesla that introduced AC and the result is the grid we all depend on today. So dream all you want about DC but it will never work unless some other genius figures out a better mousetrap.
The game changer is solar... if you put solar panels on your home, and you put a battery in your home, then you just need to get the power from the battery to your appliances, you don't need to have power lines.
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Old 31-07-2015, 11:28   #9
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Interesting they mention "household fuel-cell "ENE-FARM" to make electricity..." Would expect American power companies take a very dim view of Panasonic, etc., bringing fuel cells into the US Market. Taint' good for their bottom line.
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Old 07-08-2015, 08:16   #10
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

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Originally Posted by autumnbreeze27 View Post
Will be nice for us when we get cheaper 12v appliances!

https://translate.google.co.uk/trans...-text=&act=url
Sharp has succeeded in commercialization of powered by electricity "DC consumer electronics" of the generator that produces direct current with the housing, such as solar panels (DC).
DC appliances, the direct current of electricity, alternating current flowing through the housing of wiring (AC) does not need to be converted to electricity, is reduced power loss during conversion. It has been noted as "energy-saving appliances of the next generation", Sharp is the end of the year, to launch the world's first DC-enabled air conditioning.
The current from the transmission and distribution wires to the home of the outlet, all electric alternating current is flowing. and solar panels spread advances, household fuel cell "ENE-FARM" to make electricity and hot water using, such as city gas, a direct current of electricity generated is converted into alternating current through the power conditioner, the electrical wiring in the home and send to that, but that this time 5% or more of the power loss occurs.
Even nicer when we get 48v appliances. Much more efficient.
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Old 08-03-2016, 06:35   #11
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Not so sure about DC air conditioning for boats, a small 4200 BTU unit will take about 25 to 30 A to run on 12V DC, this heavy load will abuse the charging system on any small boat, to the contrary a unit AC/ DC will run on AC in shore power, plus will deliver 48A of smart charging to keep the batteries in top shape.
I was able to cool my Luhrs 40 Open salon without any problem, plus my helm unit operates under alternator 12V under way.
this is their website www.miniHVAC.com
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Old 08-03-2016, 11:53   #12
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

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Not so sure about DC air conditioning for boats, a small 4200 BTU unit will take about 25 to 30 A to run on 12V DC, this heavy load will abuse the charging system on any small boat, to the contrary a unit AC/ DC will run on AC in shore power, plus will deliver 48A of smart charging to keep the batteries in top shape.
I was able to cool my Luhrs 40 Open salon without any problem, plus my helm unit operates under alternator 12V under way.
this is their website www.miniHVAC.com
Very interesting...Is on/off or also inverter meaning the compressor can run at whatelse % of the load?

Webasto and truck/bus air conditioning still works 12 or 24v dc, only need to replace an hatch for heat exchanger...
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Old 08-03-2016, 12:00   #13
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Compressor is not an inverter type, they are claiming to be working on one but at the this time is on and off.
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Old 08-03-2016, 12:14   #14
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

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Compressor is not an inverter type, they are claiming to be working on one but at the this time is on and off.
Thanks...

Am i wrong or i did not see the marine-closing circuit water heat exchanger?
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Old 08-03-2016, 12:26   #15
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Re: Sharp announces DC Air Conditioner by end of year, more DC appliances to follow

Just for an example, Prius Airconditioner is DC, and has a brushless, variable speed motor to turn the compressor.
DC / AC doesn't really matter as either is convertible to the other without too much loss, efficiency is what matters.
If a DC Airconditioner isn't significantly more efficient than an AC one, there isn't much to be gained.


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