Power consumption: new Dustbuster

Posted by Puddin' Man on February 4, 2007, 5:13 pm

Just got a new B&D Dustbuster 9.6v (CHV0600). $26 at Kmart.

If I leave it on the charger-cradle, it'll waste current just
warming the niCad or somesuch? How much?

Could use some help with the arithmetic.

Power Unit:
Input 120v 60hz 4.5w
Output 15v 130mA

If I just left it in the cradle, what would power consumption
for a full year look like? Numbers above are sufficient?

It 'pears I'm paying about 8 cent a kilowatt-hour ...

TIA,
Puddin'

"Life is nothing but a competition to be the criminal rather
than the victim."
- Bertrand Russell

Posted by JoeSpareBedroom on February 4, 2007, 5:21 pm

> Just got a new B&D Dustbuster 9.6v (CHV0600). $26 at Kmart.
> If I leave it on the charger-cradle, it'll waste current just
> warming the niCad or somesuch? How much?
> Could use some help with the arithmetic.
> Power Unit:
> Input 120v 60hz 4.5w
> Output 15v 130mA
> If I just left it in the cradle, what would power consumption
> for a full year look like? Numbers above are sufficient?
> It 'pears I'm paying about 8 cent a kilowatt-hour ...

It 'pears? How does fruit relate to electricity in this context?

Posted by Jeff Wisnia on February 4, 2007, 6:34 pm

Puddin' Man wrote:

> Just got a new B&D Dustbuster 9.6v (CHV0600). $26 at Kmart.
>
> If I leave it on the charger-cradle, it'll waste current just
> warming the niCad or somesuch? How much?
>
> Could use some help with the arithmetic.
>
> Power Unit:
> Input 120v 60hz 4.5w
> Output 15v 130mA
>
> If I just left it in the cradle, what would power consumption
> for a full year look like? Numbers above are sufficient?
>
> It 'pears I'm paying about 8 cent a kilowatt-hour ...
>
> TIA,
> Puddin'
>
> "Life is nothing but a competition to be the criminal rather
> than the victim."
> - Bertrand Russell
>

The ratings you quoted are MAXIMUM ratings which MIGHT be reached during
the recharging of a discharged battery. Once the battery is charged the
power draw will quite likely drop a fair amount.

How much will it drop?

Difficult to say exactly, you'd have to use a current meter to measure
what it's drawing from the 120 volt line after the battery is charged.

But, even if it DID draw the full 4.5 watts all the time, ir would take
1000/4.5 = 222 hours to consume one KWH. That's about 9 days, so at 8
cents per KWH it'll burn up a little less that a penny a day, so call it
maybe $3.25 per year worst case.

Capice?

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

Posted by Charlie Bress on February 4, 2007, 10:07 pm

Leaving it in the charger may shorten the life of the battery. B&Dsays it is
OK, but others say overcharging is not good.
Cost of new battery overshadows cost of power.
Charlie

Posted by HeyBub on February 4, 2007, 10:17 pm

Charlie Bress wrote:

> Leaving it in the charger may shorten the life of the battery.
> B&Dsays it is OK, but others say overcharging is not good.
> Cost of new battery overshadows cost of power.

New battery for DustBuster, $18.00

New Dirt Devil (with batteries), $15.87 at WalMart.

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