Consider swapping out your Antminer S2 power supply

[mufa23]

The new Antminer S2's are being shipped with the ENERMAX Platimax EPM1000EWT Power Supply. They are pulling ~1,040 watts from the wall.

The single 12v rail only supplies a total of 83 amps. Which is a total of 996w on the 12v rail. It is pulling 04.41% more than it should be.

BUT the unit is advertised as being 89-94% efficient. If you factor in the 12v rail supplying 996w at 89% (lowest efficiency), and 996w at 94% (highest efficiency), then the rail is only guaranteed to supply between 886.44-936.24 watts of power.

THAT'S BETWEEN 17.32%-11.08% OVERLOADED!

Don't mix up input wattage with output wattage. Input wattage times efficiency equals output wattage. 996w is the max output wattage. 1040 is the input wattage. 1040 * 89% = 926w, or 1040 * 94% = 978w. It's definitely near the limit, but still under the max.

It would be good to replace the power supply. Bitmaintech should offer the S2 without power supply.

Ah, right... I added the efficiency rating to the output rather than the AC/DC conversion. Big mistake!

I agree with you about the power supply though. It's still being pushed to it's limits and should be replaced. I updated the thread.

[Syke]

The new Antminer S2's are being shipped with the ENERMAX Platimax EPM1000EWT Power Supply. They are pulling ~1,040 watts from the wall.

The single 12v rail only supplies a total of 83 amps. Which is a total of 996w on the 12v rail. It is pulling 04.41% more than it should be.

BUT the unit is advertised as being 89-94% efficient. If you factor in the 12v rail supplying 996w at 89% (lowest efficiency), and 996w at 94% (highest efficiency), then the rail is only guaranteed to supply between 886.44-936.24 watts of power.

THAT'S BETWEEN 17.32%-11.08% OVERLOADED!

Guys, if I ran my math all correctly, you are looking at a serious flaw right now. Please double check the power supplies with your Antminer S2. Overloading a power supply drastically shortens it's life, and risks damage to the miner as well as potentially causing a fire!

Don't mix up input wattage with output wattage. Input wattage times efficiency equals output wattage. 996w is the max output wattage. 1040 is the input wattage. 1040 * 89% = 926w, or 1040 * 94% = 978w. It's definitely near the limit, but still under the max.

It would be good to replace the power supply. Bitmaintech should offer the S2 without power supply.

[seriouscoin]

The new Antminer S2's are being shipped with the ENERMAX Platimax EPM1000EWT Power Supply. They are pulling ~1,040 watts from the wall.

The single 12v rail only supplies a total of 83 amps. Which is a total of 996w on the 12v rail. It is pulling 04.41% more than it should be.

BUT the unit is advertised as being 89-94% efficient. If you factor in the 12v rail supplying 996w at 89% (lowest efficiency), and 996w at 94% (highest efficiency), then the rail is only guaranteed to supply between 886.44-936.24 watts of power.

THAT'S BETWEEN 17.32%-11.08% OVERLOADED!

Guys, if I ran my math all correctly, you are looking at a serious flaw right now. Please double check the power supplies with your Antminer S2. Overloading a power supply drastically shortens it's life, and risks damage to the miner as well as potentially causing a fire!

Silly you dont even understand AC-DC efficiency.


Stupid tends to make alot of noise huh?

[Zelek Uther]

We have covered this already ad-nauseam in the official S2 thread. Bitmain checked the specs with Enermax and the PSU can handle the load.

[dogie]

Sigh.

[Threader]

It would be good to replace the power supply. Bitmaintech should offer the S2 without power supply.

My experience with asking a BTC miner manufacturer to offer a credit for power supply delete is most always not even close to the cost of local or internet replacement power supply purchase.

You be better off keeping the Enermax 1000w and using it on you S1 farm if you have one, selling it or keeping it as a backup and straight up investing in a new 1200-1500W PS.

[HellDiverUK]

THAT'S BETWEEN 17.32%-11.08% OVERLOADED!

No, it isn't.

Guys, if I ran my math all correctly

You didn't.

[mufa23]

Don't mix up input wattage with output wattage. Input wattage times efficiency equals output wattage. 996w is the max output wattage. 1040 is the input wattage. 1040 * 89% = 926w, or 1040 * 94% = 978w. It's definitely near the limit, but still under the max.

It would be good to replace the power supply. Bitmaintech should offer the S2 without power supply.

Ah, thanks man! I updated the OP with your equation, and crossed out mine. You're right, it's still a good idea to swap out the power supply.

It would be good to replace the power supply. Bitmaintech should offer the S2 without power supply.

My experience with asking a BTC miner manufacturer to offer a credit for power supply delete is most always not even close to the cost of local or internet replacement power supply purchase.

You be better off keeping the Enermax 1000w and using it on you S1 farm if you have one, selling it or keeping it as a backup and straight up investing in a new 1200-1500W PS.

Solid advice

What a fuckin' idiot! I say the OP might as well lock this thread like this stupid motherfuckin' idiot did after he shown the world his colossal mistake: https://bitcointalk.org/index.php?topic=560719.0

What are you talking about? Rather then posting something off topic, consider contributing like the rest of everyone else next time. Indeed my equation was wrong, but the rest of the math was solid. Which I asked about "Guys, if I ran my math all correctly" then we'd have to upgrade our PSUs. Which turns out, is a good idea to do that anyway regardless of my efficiency error.

[Rabinovitch]

Guys, how do you think, which PSU power will be needed for near-future S2s upgrade promised by Bitmain? Will it be the same as now or those who want to upgrade will be forced to buy new more powerful PSUs?