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
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