[ANN] Selling Server PSU's with PCI-e cable - page 2.

Burks

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Activity: 303

Merit: 250

Quote from: Grim on February 29, 2016, 08:20:57 AM

You can't compare the efficiency if you don't take the total wattage of the PSU into account.

If you test each unit at approximately 70% load then you can compare them.

1300 watt test @ ~ 900 load
2000 watt test @ ~1400 load
2880 watt test @ ~2000 load

I'm sorry to bother you that much but I do believe many customers would like to know anyway.

Moreover I thought MOST server PSUs delivery platinum or even titanium efficiency yet the numbers you provide are hardly even gold efficiency.

I heard of 94-96% efficiency server units, which are they?

Well, Efficiency is basically OUT/IN.
In the end, you have a load which needs to be powered. It doesn't matter if you do that with a 2880w PSU or a bunch of 900w PSU's.

This week I'll extend the measurements up to 6x S1.
I will add a 1100w ATX PSU to the test.
To be honest, I expected higher efficiency as well

If you have a suggestion, let me know so I can test them the same way...

Grim

sr. member

Activity: 506

Merit: 252

You can't compare the efficiency if you don't take the total wattage of the PSU into account.

If you test each unit at approximately 70% load then you can compare them.

1300 watt test @ ~ 900 load
2000 watt test @ ~1400 load
2880 watt test @ ~2000 load

I'm sorry to bother you that much but I do believe many customers would like to know anyway.

Moreover I thought MOST server PSUs delivery platine or even titanium efficiency yet the numbers you provide are hardly even gold efficiency.

I heard of 94-96% efficiency server units, which are they?

Burks

sr. member

Activity: 303

Merit: 250

Yesterday the new meter came in and I deliverd the first 25 PSU's.

The customer has some S7's (batch Cool

and bitmaintech PSU's

2x Bitmaintech: 2672
3x 1300w+: 2792w

So the Bitmaintech is still 4% more efficient :s

Id did some extra measurements with the new powermeter

What I noticed about the 2880w power supply: As soon as the fans spin up, the usage increases about 30w (and that is already with 2x S1, not even full fan speed).

Quote from: Grim on February 25, 2016, 06:15:41 AM

Wow, these 2000 watt units are appealing Shocked

Running 2 units at 75% to 80% (1500 to 1600 watt) from one breaker seems ideal.
(at least for me, I have exactly one double cable = 2 plugs to each 240v/15a breaker, max 3600 watt)

At 75% they should normally run at PEAK efficiency as well.

Very nice page you have.
Thanks

Efficiency numbers for each unit would be great of course.
If you can eg. load test 60 % or up to 80% on each unit, that should be enough to provide useable numbers.

Moreover I never checked what protection features these units offer:

Some very crucial ones are:

1. SCP (short circuit protection = MOST important, can save your life Grin

)
I'll check that with a cheaper PSU if you don't mind.

2. OVP (over voltage protection)
14V (Almost on every PSU it is 14v)

3. OCP or OPP (over current/power protection)
This one isn't that important with HUGE single rail PSUs which I assume they all are.
They're all singel rail. I'll test this again with a cheap PSU

4. OTP (over temp protection)
I know a 1400w PSU just quits at high temps

btw on your page I didn't find these 900 watt units you talked about ...
I've quit with those ones, since they're quite bulky and noisy

Grim

sr. member

Activity: 506

Merit: 252

Wow, these 2000 watt units are appealing Shocked

Running 2 units at 75% to 80% (1500 to 1600 watt) from one breaker seems ideal.
(at least for me, I have exactly one double cable = 2 plugs to each 240v/15a breaker, max 3600 watt)

At 75% they should normally run at PEAK efficiency as well.

Very nice page you have.

Efficiency numbers for each unit would be great of course.
If you can eg. load test 60 % or up to 80% on each unit, that should be enough to provide useable numbers.

Moreover I never checked what protection features these units offer:

Some very crucial ones are:

1. SCP (short circuit protection = MOST important, can save your life Grin

)

2. OVP (over voltage protection)

3. OCP or OPP (over current/power protection)
This one isn't that important with HUGE single rail PSUs which I assume they all are.

4. OTP (over temp protection)

btw on your page I didn't find these 900 watt units you talked about ...

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Burks on February 22, 2016, 06:27:06 AM

Quote from: Grim on February 22, 2016, 03:10:23 AM

any news?

Just got them in.
I will test it with 2, 2.5 and 3x S1

When running 3 PSU's on 2 miner
2x 103A = 206A
206/3 = 69A per PSU
69x12 = 828W per PSU
A S1 is about 350w --> 2.4 x S1 should be the same load

results: Tonight!

Unfortunately my power meter broke a couple of days ago.
When I test it with the Amp meter i get somewhere between 90 and 92% with 2,5 S1's attached....

I bought a new power meter, hopefully it arrives before the weekend...

BTW: I just finished my webshop: http://www.bitcoinpsu.eu/ I hope you gys like it

regards

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on February 22, 2016, 03:10:23 AM

any news?

Just got them in.
I will test it with 2, 2.5 and 3x S1

When running 3 PSU's on 2 miner
2x 103A = 206A
206/3 = 69A per PSU
69x12 = 828W per PSU
A S1 is about 350w --> 2.4 x S1 should be the same load

results: Tonight!

Grim

sr. member

Activity: 506

Merit: 252

any news?

Grim

sr. member

Activity: 506

Merit: 252

Within 10 to 15 working days would be ok. (the sooner the better)

I appreciate it that you do an efficiency test beforehand.

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on February 10, 2016, 07:01:06 AM

3x ~900watt?

If they deliver 93+% peak efficiency I'll take them.

When do you need them?
Early next week I can test the actual efficiency for you.

Grim

sr. member

Activity: 506

Merit: 252

3x ~900watt?

If they deliver 93+% peak efficiency I'll take them.

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on February 09, 2016, 07:47:42 AM

That price per unit is totally fine for me if the peak efficiency is as good as you say. (93-94%)

Grin

Actually I don't care about the single PSU wattage.

I just need about 2500+ watt at high efficiency for now. (maybe more in future)

The units can be as low as 900 watt or as high as 2880 watt ... I simply order that much units to fill my "wattage" needs.

(yes i know NOT to plug different psus to one and the same device
due to slight voltage difference of each unit/load)

I can make of 3 PSU's for 2x S7
That case the PSU will be around 92-93% efficient.

Grim

sr. member

Activity: 506

Merit: 252

That price per unit is totally fine for me if the peak efficiency is as good as you say. (93-94%)

Grin

Actually I don't care about the single PSU wattage.

I just need about 2500+ watt at high efficiency for now. (maybe more in future)

The units can be as low as 900 watt or as high as 2880 watt ... I simply order that much units to fill my "wattage" needs.

(yes i know NOT to plug different psus to one and the same device
due to slight voltage difference of each unit/load)

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on February 09, 2016, 04:45:27 AM

Ah nice numbers for the bitmaintech. (good efficiency)

I would like to order 2 units of the bitmaintech. (how many pci-e plugs?)

Are you doing escrow? and if, with whom?

Shipping is to: AUSTRIA

Haha, unfortunately, I don't sell those (yet)

And still, before you have them here, you're looking at 145-160 euro per PSU without sales tax, so that efficiency comes at a price :S

Grim

sr. member

Activity: 506

Merit: 252

Ah nice numbers for the bitmaintech. (good efficiency)

I would like to order 2 units of the bitmaintech. (how many pci-e plugs?)

Are you doing escrow? and if, with whom?

Shipping is to: AUSTRIA

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on February 06, 2016, 09:27:47 AM

8 pci-e 1440w unit is fine for me

I would take 2 units

But I would appreciate an efficiency test first. Tongue

(You can cut open the power cable "enclosure" and test the ac current-in that way.)

Ok, so first test results are in:

Summary
The bitmaintech is really efficient with around 93,9-93,5% efficiency on a S7 batch 8. The new 1300+w PSU that I’m working on reaches about 89,5%. I did not fully test a 2880 with j4bber board, but on first sight, it is even more inefficient.

Testing procedure
I’ve hooked both PSU up to a Batch 8 S7. Next to that I tested: 1-4x S1 on the 1300+, 4x S1 on the 1440 and 2880 with jabber board on 1x S7 Batch 8 & 1x S7 batch 7.

- All measuring has being done with a Voltcraft 4500 Advanced powermeter, a Voltcraft VC-330 powerclamp and a Tenma 72-7725
- Voltages were measured at PCI-e plug.
- Time intervals was 10 and 20 min.

Results S7 batch 8

Next to that I tested the efficiency with some antminer S1's as load.
- tested with 1/2/3/3,5/4 x S1 on full speed

The 1400 got around 88% and the J4bberwock with 2880 drew 2875w for a S7 Batch 8 and a S7 batch unknown.
If there is enough interest I will test more PSU's
And if you have measurement wishes, please let me know!

regards

Grim

sr. member

Activity: 506

Merit: 252

8 pci-e 1440w unit is fine for me

I would take 2 units

But I would appreciate an efficiency test first. Tongue

(You can cut open the power cable "enclosure" and test the ac current-in that way.)

Burks

sr. member

Activity: 303

Merit: 250

Quote from: Grim on January 26, 2016, 07:37:33 AM

Quote from: Burks on January 25, 2016, 05:19:35 AM

About efficiency, I just bought this baby: https://www.elektor.com/voltcraft-digital-clamp-multimeter-vc-330
This week I will be measuring effciencies of the smaller PSU's

yep great way to test efficiency

compare your 240volt ac amperage to your total 12v dc amperage.

The difference determines your efficiency.

Looking forward to seeing your "real life" numbers.

Unfortunately, I forgot a phenomena: "power factor"
So now I've got this baby: http://www.conrad.com/ce/en/product/1340670/VOLTCRAFT-4500PRO-DE-9999-hrs

This weekend I'm going to do some experiments with a Bitmaintech, 2880 and my new PSU.

Quote from: Grim on February 03, 2016, 04:56:07 PM

I noticed just now that you have 1440 Watt PSUs in stock?

I would be interested in 2 of these 1440 Watt units, any details?

Shipment would be Europe, specifically Austria.

Normally I supply them with 8x PSU (10x PSU is +5 euro)
Depending on the temperature they will do between 1000w and 1400w

shipping for 2 is about 20 euro.

Quote from: Indianacoin on February 03, 2016, 05:10:23 PM

Will one 900W Dell PSU be able to run 2 Antminer S3+ miners?

If so will I still be able to overclock one miner since there are six 6-pin PCI-E cables coming with a single PSU. I will connect 4 of them with one miner that I want to overclock and I will run the other one normally with 2 of the remaining cables.

Also I noted that the shipping cost to India is nearly double of the miner = € 52,59 Cry

Can I get some discounted quote on this deal please?

I don't have the 900's anymore. I would advise a 1440w.
Than you can overclock both S3+'s

shipping for 1 is still 35 :s

Indianacoin

sr. member

Activity: 406

Merit: 252

Will one 900W Dell PSU be able to run 2 Antminer S3+ miners?

If so will I still be able to overclock one miner since there are six 6-pin PCI-E cables coming with a single PSU. I will connect 4 of them with one miner that I want to overclock and I will run the other one normally with 2 of the remaining cables.

Also I noted that the shipping cost to India is nearly double of the miner = € 52,59 Cry

Can I get some discounted quote on this deal please?

Grim

sr. member

Activity: 506

Merit: 252

I noticed just now that you have 1440 Watt PSUs in stock?

I would be interested in 2 of these 1440 Watt units, any details?

Shipment would be Europe, specifically Austria.

Grim

sr. member

Activity: 506

Merit: 252

Quote from: Burks on January 25, 2016, 05:19:35 AM

About efficiency, I just bought this baby: https://www.elektor.com/voltcraft-digital-clamp-multimeter-vc-330
This week I will be measuring effciencies of the smaller PSU's

yep great way to test efficiency

compare your 240volt ac amperage to your total 12v dc amperage.

The difference determines your efficiency.

Looking forward to seeing your "real life" numbers.

Topic: [ANN] Selling Server PSU's with PCI-e cable - page 2. (Read 4417 times)