Ax1500i output wattage at 120v

[Bajantechnician]

please correct me if im wrong, but a ax1500i should be able to output ~1500 Watts (with effeciency and all that in mind) right?

Thanks. 

[Enderman]

It outputs 1500W, it will pull 1500/efficiency watts from the wall

[Qwweb]

6 minutes ago, Bajantechnician said:

please correct me if im wrong, but a ax1500i should be able to output ~1500 Watts (with effeciency and all that in mind) right?

Thanks. 

Should be around 1410 Watt output, as it has a 94% efficiency rating. More realistically just assume 80-85% (1275W) for any PSU above a 80+ Gold rating, and 80+ thru 80+ Silver assume 75-85%. Always assume a + or - 5% margin of error.

[Cereal5]

1 minute ago, Enderman said:

It outputs 1500W, it will pull 1500/efficiency watts from the wall

 

Just now, Qwweb said:

Should be around 1410 Watt output, as it has a 94% efficiency rating. More realistically just assume 80-85% (1275W) for any PSU above a 80+ Gold rating, and 80+ thru 80+ Silver assume 75-85%.

Actually it will pull 1500 + 100/efficiency. the rating of a PSU is the wattage it will output. efficiency is how much more it will pull. I thought the same that you did at first but was corrected

[Enderman]

2 minutes ago, Cereal5 said:

 

Actually it will pull 1500 + 100/efficiency. the rating of a PSU is the wattage it will output. efficiency is how much more it will pull. I thought the same that you did at first but was corrected

Uh, I don't think you understand how power works?

You're saying if it works at 100% efficiency it will pull 1600W? LOL

 

That's not how efficiency works mate.

at 100% efficiency, outputting 1500W, you get 1500/1 = 1500W

at 90% efficiency outputting 1500W you get 1500/.9 = 1667W because 10% is lost during conversion.

[Qwweb]

 

Just now, Cereal5 said:

 

Actually it will pull 1500 + 100/efficiency. the rating of a PSU is the wattage it will output. efficiency is how much more it will pull. I thought the same that you did at first but was corrected

For the ax1500i, corsair specifies a 94% effeciency so 1500x0.94=1410

[Cereal5]

2 minutes ago, Enderman said:

at 90% efficiency outputting 1500W you get 1500/.9 = 1667W because 10% is lost during conversion.

actually thats exactly how it works. and what I was saying.

 

2 minutes ago, Qwweb said:

For the ax1500i, corsair specifies a 94% effeciency so 1500x0.94=1410

any PSU rated at a wattage can output that wattage. the efficiency is how much OVER that wattage is has to pull from the wall. so 1500/.94=1596

[Qwweb]

Just now, Cereal5 said:

actually thats exactly how it works. and what I was saying.

 

any PSU rated at a wattage can output that wattage. the efficiency is how much OVER that wattage is has to pull from the wall. so 1500/.94=1596

The efficiency rating is built in for thermal inefficiency due to resistance.

 

[Cereal5]

Just now, Qwweb said:

The efficiency rating is built in for thermal inefficiency due to resistance.

 

yeah. so it pulls more than 1500W in order to output 1500W to the computer. not - it pulls 1500 to output less than 1500 to the computer

[Enderman]

6 minutes ago, Cereal5 said:

actually thats exactly how it works. and what I was saying.

No, you said 1500 + 100/efficiency.

That's wrong.

Maybe you meant to say x instead of +?

[Cereal5]

5 minutes ago, Qwweb said:

The efficiency rating is built in for thermal inefficiency due to resistance.

 

watch until about the 50 second mark. he says "[power supplies are rated] in the total amount of watts they are capable of OUTPUTING"

[Cereal5]

Just now, Enderman said:

No, you said 1500 + 100/efficiency.

That's wrong.

Maybe you meant to say x instead of +?

oh big deal. you get the point x, + its two lines crossed together

[Enderman]

11 minutes ago, Qwweb said:

 

For the ax1500i, corsair specifies a 94% effeciency so 1500x0.94=1410

No, sorry, PSUs are rated by output wattage, they will pull more than rated wattage from the wall.

If you have a 1500W PSU at 100% load and 90% efficiency it will output 1500W and draw 1667W.

[Qwweb]

1 minute ago, Cereal5 said:

yeah. so it pulls more than 1500W in order to output 1500W to the computer. not - it pulls 1500 to output less than 1500 to the computer

80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. Such PSUs waste 20% or less electric energy as heat at the specified load levels, reducing electricity use and bills compared to less efficient PSUs.

 

The 100% load would translate to the 1500W (power in from the wall) in to the system, at 100% load and 94% efficiency your power out (to computer) would be 1410W, with 90W lost to thermal energy due to resistance in the process.  

[Cereal5]

1 minute ago, Qwweb said:

80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. Such PSUs waste 20% or less electric energy as heat at the specified load levels, reducing electricity use and bills compared to less efficient PSUs.

 

The 100% load would translate to the 1500W (power in from the wall) in to the system, at 100% load and 94% efficiency your power out (to computer) would be 1410W, with 90W lost to thermal energy due to resistance in the process.  

reference video above. PSU wattage is rated in their output, not their intake

[Enderman]

2 minutes ago, Qwweb said:

80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. Such PSUs waste 20% or less electric energy as heat at the specified load levels, reducing electricity use and bills compared to less efficient PSUs.

 

The 100% load would translate to the 1500W (power in from the wall) in to the system, at 100% load and 94% efficiency your power out (to computer) would be 1410W, with 90W lost to thermal energy due to resistance in the process.  

1500/0.94= 1596W from the wall.

The power output from a PSU is calculated AFTER efficiency, NOT before.

[Qwweb]

Just now, Cereal5 said:

reference video above. PSU wattage is rated in their output, not their intake

The thermal inefficiency comes from the internal components (ie. semiconductors), not from outlet to PSU. The pathway from PSU, to motherboard, to components is not a perfectly efficient one, as being so would break the law of enthalpy.

 

[Cereal5]

Just now, Qwweb said:

The thermal inefficiency comes from the internal components (ie. semiconductors), not from outlet to PSU. The pathway from PSU, to motherboard, to components is not a perfectly efficient one, as being so would break the law of enthalpy.

 

You're overthinking this. wattage is expressed in output wattage. that's just how it is. its not expressed in watts pulled from the wall

[Enderman]

9 minutes ago, Qwweb said:

The thermal inefficiency comes from the internal components (ie. semiconductors), not from outlet to PSU. The pathway from PSU, to motherboard, to components is not a perfectly efficient one, as being so would break the law of enthalpy.

 

Please read and inform yourself  http://www.corsair.com/en/blog/2012/august/80-plus-platinum-what-does-it-mean-and-what-is-the-benefit-to-me

 

[STRMfrmXMN]

9 hours ago, Qwweb said:

 

For the ax1500i, corsair specifies a 94% effeciency so 1500x0.94=1410

That's not how 80 PLUS efficiency works. Corsair rates the AX good to output 1500W. OK, easy enough. Ecova rates it as an 80 PLUS Platinum efficient unit. Easy enough.

 

Assuming 100% load (so 1500W is being demanded of the PSU), you'd draw a bit more power from the wall since PSUs are not 100% efficient. Since I live in North America I'll assume we're using a 115V nominal socket to provide for the PSU, and at 115V and 100% load, an 80 PLUS Platinum efficient PSU is 89% efficient.

 

1500/.89 = 1685

 

So that's how much power would be demanded by the unit from the wall.

 

I'll clue you in to my 80 PLUS efficiency guide, both pinned on the PSU/chassis subforum and also linked in my signature below

[Bajantechnician]

15 hours ago, Qwweb said:

Should be around 1410 Watt output, as it has a 94% efficiency rating. More realistically just assume 80-85% (1275W) for any PSU above a 80+ Gold rating, and 80+ thru 80+ Silver assume 75-85%. Always assume a + or - 5% margin of error.

 

 

15 hours ago, Enderman said:

It outputs 1500W, it will pull 1500/efficiency watts from the wall

 

15 hours ago, Cereal5 said:

 

Actually it will pull 1500 + 100/efficiency. the rating of a PSU is the wattage it will output. efficiency is how much more it will pull. I thought the same that you did at first but was corrected

 

 

15 hours ago, Cereal5 said:

actually thats exactly how it works. and what I was saying.

 

any PSU rated at a wattage can output that wattage. the efficiency is how much OVER that wattage is has to pull from the wall. so 1500/.94=1596

 

 

5 hours ago, STRMfrmXMN said:

That's not how 80 PLUS efficiency works. Corsair rates the AX good to output 1500W. OK, easy enough. Ecova rates it as an 80 PLUS Platinum efficient unit. Easy enough.

 

Assuming 100% load (so 1500W is being demanded of the PSU), you'd draw a bit more power from the wall since PSUs are not 100% efficient. Since I live in North America I'll assume we're using a 115V nominal socket to provide for the PSU, and at 115V and 100% load, an 80 PLUS Platinum efficient PSU is 89% efficient.

 

1500/.89 = 1685

 

So that's how much power would be demanded by the unit from the wall.

 

I'll clue you in to my 80 PLUS efficiency guide, both pinned on the PSU/chassis subforum and also linked in my signature below

 

Alrighty, thanks guys

for some reason on some website, it said that an ax1500i could only output 1300w with 120v, and it needed 240v to output the full 1500 watts.

 

 

[Enderman]

5 minutes ago, Bajantechnician said:

 

 

 

 

Alrighty, thanks guys

for some reason on some website, it said that an ax1500i could only output 1300w with 120v, and it needed 240v to output the full 1500 watts.

 

 

It can do more on 240v though

 

It can only do 1300W when on 100V

But I don't know of any country that uses 100V power...

 

It actually seems like the 1300W limit is due to the 15A wall plug limitation, since at 100V you would need 15A if the PSU was 100% efficient, and since it's about 90% efficient it would require over 15A which is over specifications.

 

On 115V power it is fine and can do full 1500W.

[Bajantechnician]

1 hour ago, Enderman said:

It can do more on 240v though

 

It can only do 1300W when on 100V

But I don't know of any country that uses 100V power...

 

It actually seems like the 1300W limit is due to the 15A wall plug limitation, since at 100V you would need 15A if the PSU was 100% efficient, and since it's about 90% efficient it would require over 15A which is over specifications.

 

On 115V power it is fine and can do full 1500W.

 

I see.

Thank you