zapped 1
Member
- Location
- north port fl
does it really sve energy unpluging cell phone chargers when there not being used
does it really save?????????????????
- Thread starter zapped 1
- Start date
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- Location
- Logan, Utah
The only power consumed by a cell phone charger when the cell phone is not plugged in would be the power losses from heat due to the inefficiencies in the charging unit. This is similar to an unloaded transformer, there is still power consumed from the core losses.
Chris
Chris
brian john
Senior Member
- Location
- Kilmarnock, Va
- Occupation
- Retired after 52 years in the trade.
As noted some, depending on the number of kids you have and how many lamps they leave on so the charger is well lit.
I would think nation wide with all PCs, game stations, and other electronics it could be a significant amount. Then there is the green feel good minimal savings but you feel like you are doing something to help.
I would think nation wide with all PCs, game stations, and other electronics it could be a significant amount. Then there is the green feel good minimal savings but you feel like you are doing something to help.
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
090422-1520 EST
A small wall transformer and rectifier supply unload may dissipate 1 W, CUI 12 VDC 300 MA output rating. Whereas a Phihong switching type 12 V 420 MA output rating is about 0.3 W. I am using a 75 W meter for this measurement and thus the accuracy is not good.
The non-switching type is now banned.
Lots of these little things do add up. However, the politicians should be talking about the big stuff. My average consumption is about 40 KWH per day. By keeping unused lights off I can generally reduce this to about 30 KWH per day.
One CUI supply at 1 W would consume about 8.76 KWH per year or 0.024 KWH per day. This is 0.024/10 = 0.24% of the energy I can save easily by other means.
What you really want to do is analyze your residual load for unnecessary loads that are always on. Eliminate the unnecessary loads. Next attack the variable loads and see what ones are being left on when not necessary. Much of this unnecessary load is lights.
To go around and unplug cellphone chargers is sort of silly in comparison to solving the problem of large unnecessary loads. In time, as you get new cellphones, the new chargers will have less residual loss.
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A small wall transformer and rectifier supply unload may dissipate 1 W, CUI 12 VDC 300 MA output rating. Whereas a Phihong switching type 12 V 420 MA output rating is about 0.3 W. I am using a 75 W meter for this measurement and thus the accuracy is not good.
The non-switching type is now banned.
Lots of these little things do add up. However, the politicians should be talking about the big stuff. My average consumption is about 40 KWH per day. By keeping unused lights off I can generally reduce this to about 30 KWH per day.
One CUI supply at 1 W would consume about 8.76 KWH per year or 0.024 KWH per day. This is 0.024/10 = 0.24% of the energy I can save easily by other means.
What you really want to do is analyze your residual load for unnecessary loads that are always on. Eliminate the unnecessary loads. Next attack the variable loads and see what ones are being left on when not necessary. Much of this unnecessary load is lights.
To go around and unplug cellphone chargers is sort of silly in comparison to solving the problem of large unnecessary loads. In time, as you get new cellphones, the new chargers will have less residual loss.
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Some but not a lot.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
As has been said, it saves from an economy of scale viewpoint. For you in your household however, if you unplugged every "wall wart" in your house when not in use, it might save you $2-3 per year in electricity. I personally think the avoidance of hassle factor from plugging them in every time I want to charge my phone or tooth brush or battery charger to be well worth the small amount of money.
But if you take that $3/year and multiply it by 115 million homes (US census projection for 2010), it does add up.
But if you take that $3/year and multiply it by 115 million homes (US census projection for 2010), it does add up.
It does.
But still not a lot in the context of a total consumption of 4*10^12 kWh.
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