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Re: Surge Protectors
SatKartr #300550 04/06/10 03:17 PM
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Anyway my main point in requesting the above analysis was to determine if my system was supplied with enough maximum current based on a nondedicated 20 amp circuit breaker, if memory serves.

It seems like there would be enough power under normal circumstances, 1430 watts/120 volts = 11.92 amps, but not necessarily at maximum capacity, 1430 watts/120 volts = 24.75 amps.

My guess is that I would seldom if ever run the system anywhere near maximum capacity, so most likely I remain in the ballpark for most if not all conceivable situations, unless there are some instantaneous power draw situations that are not covered?

If anyone has any input regarding the number of amps I should attempt to make available via my home electrical circuit, it would be much appreciated.


"If you try to turn toward it, you go against it."
Re: Surge Protectors
SatKartr #300575 04/06/10 05:01 PM
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Sort of wondering about their numbers, why do they say the ep800 has a maximum draw of 150 watts when it has an 800 watt amp? If the Denon is 130 watts per channel X 7, why is the maximum draw only 840 watts, rather than 910 watts? What does normal usage mean, I wonder how they estimate that?

I suppose this gets me thinking in practical terms about how to estimate the power the system ideally needs, although it's all a bit theoretical, not sure I need to change anything.


"If you try to turn toward it, you go against it."
Re: Surge Protectors
SatKartr #300577 04/06/10 05:07 PM
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You can measure the amperage that passes through the wire that you plug into the wall. I don't know the math, but I'm assuming that you can then convert this to watts.

Re: Surge Protectors
CatBrat #300579 04/06/10 05:33 PM
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Watts = Volts * Amps

You can assume that the voltage is going to be around 115 Volts in North America.

Most measuring devices, like the Kill-A-Watt, will give you the Watt reading directly (because it's also measuring voltage).


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Surge Protectors
ClubNeon #300599 04/06/10 06:35 PM
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OK, I was trying to calculate peak power needs more or less theoretically, to cover all situations, but I suppose I could look into measuring the actual levels, that would make sense, especially if the measuring devices were sensitive to instantaneous peak current draw? The voltage in my home normally measures at 120v plus, I know that running the system without taking the subs into account normally requires no more than 7-8 amps even at robust volume levels, if the subs were at a theoretical maximum that could add 1600 watts/120 volts = 13.3 amps, although I'm actually not sure at this point if both subs are on the same circuit or not.

Just trying to get a feel for any real world implications, I noticed that some forum members have dedicated HT electrical circuits and wondered if I should think about going down that road.


"If you try to turn toward it, you go against it."
Re: Surge Protectors
SatKartr #300603 04/06/10 06:55 PM
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I think North America changed from 115 to 120/121 volts a few years back. Mine runs between 120 and 121 on a display I have.

Re: Surge Protectors
CatBrat #300612 04/06/10 08:03 PM
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Mine reads 115.8 (well from .7 to .9). I think it varies from 110 to 120 from area to area.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
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