Power Consumption idle

Assume:
* amp uses 75W at idle
* amp is idling 24/7
* cost of electricity is $0.14 / kWh (on the high side)

So, per day the amp uses 75W * 24h = 1.8 kWh
On a monthly basis, the cost would be (1.8 kWh / day)(30 days/month)($0.14 / kWh) = $7.56

Of course, if you actually USE the amp and it draws more power, then you will need to factor that in, too.

Michael

$0.14/kWh...WOW! We only pay $0.06 here (VA)!

$0.075 in S. WI

Thanks for the answers, I thought the real answer would lie in the "Kill a Watt", I'm just a major cheapo. I guess I don't really want to know how much my large salt water fish tank is using, anybody want to buy a large tank?

My rate is .0814 average, and every month I end up with a $250.00 electric bill. For a single guy this just seems high. I won't bore you all with my bills here.....

Thanks
Marty

That bill doesn't make sense. Let's assume that you're using a 15A circuit, so the breaker would fire if the current draw were significantly more than 15A for any reasonable period of time. That means your system draws less than 15A.

Let's further assume that for some (odd) reason your system is drawing 10A (quite a bit), and that it does this 24/7.

At 120V, (10 A)(120 V) = 1200W
(1200 W) (24 hrs/day) = 28.8 kWh / day
(28.8 kWh / day)(30 days/ month)($0.0814 / kWh) = $70.33

This should be an overestimation of what you would expect to pay monthly for the stereo system, since a 10 ampere draw is a lot for most systems.

A $250/month bill doesn't make sense. But then again, I get $50 bills when I am away from home for the entire month, and the only thing plugged is in the refrigerator. I don't trust my apartment building's meters.

I would definitely investigate this further.

Michael