Topic: Bitmain will be releasing S15 and T15 on 8/11/2018 - page 4. (Read 31485 times)

so far just the one guy.

Have there been any more reports of issues with the PSU's. I'm kicking around the idea of an S15/T15 not to sure yet. I'll have to do some more more testing but I believe I've seen my lines hit above 240 when testing after installs.

I did have to have a check back to see what there APW7's were rated at to see if I felt like risking it, but they were rated up to 264V.

I doubt it.

It uses same psu as the s15

It uses 1024 watts on lowest setting

the s15 uses less watts on the lowest settings.  like 900

Here are the s15 soundproofing videos I have done

https://www.youtube.com/watch?v=auakWENgP8w

notice it fires into  a cushion  placed 2 feet away

this one the sound meters more accurate

https://www.youtube.com/watch?v=P8MwWwctWVw

I am pretty sure the s15 is better for noise

Yea just saw the twitter posts.

Only accessible with poor network security correct?

I found an exploit that can be used to enable SSH https://twitter.com/james_hilliard/status/1095225270011781120.

T15 in LPM beats m10 stock. Best unit to import to the US imo.

The T15  with a good coupon is not that bad a deal.    It is 710 + 102 to ship to usa

it beats the tax.  as it is under 800 for the gear.

it nets to 812.  so a 230 coupon drops it to 582   that works when compared to the old m10 prices

and is better then the new m10 price.

I am not sure anyone has a 230 usd coupon for bitmain the may have expired.

If I could get a few of these  with a could coupon it may be worth it.

Yes I believe you could always use those coupons.

I was looking to buy some as i was on the fence between an S15/T15 with a coupon, or the M10. So at least going back to around the 12th of January.

BM site is saying coupons up to $230 can be used for both the S15 and T15, has this always been the case?

One guy had two psu fails.

ConnerM

He was doing just over 240 volts.

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Ah this is complicated but here goes. I am color blind so I never was able to do formal training in electronics.  But I have a decent knowledge of parts and gear.  They took one leg of the 240 in and run it directly to the outlets.  So if you have a hot 240 like I do one leg is not altered at all.

The other leg goes into a torrid transformer a 110 to 100 volt.

So this means a 122 leg goes in and it is not touched.
The other 122 jet goes in and is dropped by the transformer to 100
It then feeds into some relays and parts that drop to 98 and the 98 plus 122 = 220.

So the legs are not even but they sum close to 220 vs 238-243
And only one leg runs into the transformer.

Also they lift the ground which is not exactly how I would do it.

I cut the two prong plug 🔌  and put a three prong plug. I still lifted ground but I think I will add back ground.

The design does allow for a lessor transformer .  But looking at wires gauge and other parts I think it won’t do two units.

Since only one s15 user has had the psu burn (two of 15 to be exact) .  Maybe it was just a couple of shitty psu's. Meaning these regulators are not needed at all.

Keeping the unit low spec will also minimize the power loss factor. 1.5% is excellent, and the price is right as well.

The Larson transformer I was looking at was 11KVa (TX2402081P11KVA) 240v to 208v (max 53 amps) and costs about $600. I could run about 5 S15 off it with a solid safety margin but it would require extensive rewiring of my circuits.  Not worth doing for a couple months of heat at the house.

Is anyone having this issue (240v PSU failure) with S11's? T15's?

@Phil, since you opened the regulator to look at it, does it use relays to change taps or is it solid-state (SCR's/Triacs)?
Long ago I tried a el-cheapo regulator like this one and found it unusable because of too-small transformer and the relay switching times. Every time it would make an adjustment the momentary v drop as the relays switched would cause the miner to go offline. My solution was to use a programmable dual-conversion UPS like the TrippLite SU6000RT4UHV—6kVA that is always on-line and has zero transfer time. It's in/out eff is reasonable at a measured 93% in dual-conversion mode and >96% in eco-mode.

I took 2 S15's home (to run for heat) on my 240 outlets and the PSU's on both units failed within 24 hours. Both PSU's got quite hot. I think my 240 outlets actual voltage may vary a little higher than that, maybe 242 or 243. They may have simply tripped a safety shutdown due to either voltage or temperature, but regardless, both ceased to function (no power) there was no way to reset them. Both units went to Bitmain and were replaced under warranty. I will not attempt to run anymore of these at or near 240v even though the spec says 200-240v. They seem to be happiest somewhere in between those numbers. I've had some units running nearly a month on our 208v rack with zero issues.

So running these on 240v is a bad idea?

I did test it  and it appears to cost 1.5%  in power. About 25 watts at high speed.

 also took it apart to figure if it really is 5000 va and 22.7 amps constant run.

I estimate it will do 1 unit at 1550 watts 24/7/365  with zero issues.
I don't think it can do 2 units at 3100 watts. 24/7/365
I think  the torrid transformer will get too hot.
I also think the power cord is  14 gauge  not 12 gauge.
So  for 1 unit in a garage it is okay it should protect the gear and last  but it won't last doing the 2 units it is rated for.

It is now on sale on ebay

https://www.ebay.com/itm/Norstar-5000-Watt-Step-UP-and-Down-Voltatge-Regulator-Transformer-Converter/332955089461?

I bid 180 offer he took it.
and ebay is giving ebucks 10%  so 180 -18 = 162  and my paypal gives 2 % so 162 -3 = 159

for 159  it will give me some piece of mind.  but  if you have  10 or 20   s15's this costs too much.

I was looking at a Larson Buck transformer to change the 240 at my house to 220 or 208 so I could run a couple of S15's at home, but it's not really cost effective. Also, they show a 3-4% loss of efficiency in the windings due to heat loss. I don't think you can step down the voltage with any device and not experience a certain small loss in the process, so keep that in mind when calculating the cost to run an S15 vs say an M10. With a transformer an S15 might end of drawing 60 or more w/per TH. It would be great if Phil could test that on his device.

We now have 28 S15's running on the rack at the office now on 208v, and they are functioning perfectly. They are all 28TH units. The min to min hash rate variance is higher than spec, can be up to 15% either way, but the daily average of the units collectively is 783.9 TH which = 783.9 which is 27.96TH per machine on average, so they are running exactly within spec on our 208v supply. Power draw is averaging 1590w per unit. That's based on the total draw on our panel. I haven't measured individual units.  We're using Triplite 3' 12awg power cables from the PDU to the units. One miner per PDU circuit, 2 miners per PDU so the breaker on the PDU's become the power switches. The 12awg cables are to minimize loss more than anything else, I don't think we would have any trouble using 14awg cables for these as long as they are short. This is all equipment reused from the S9 farm.

Bitmain replaced our 2 units that failed on 240v+ for us under warranty. One of the replacement units came with the 'open power rail' design (which bothers me greatly). All the other have the power rail covers.

Oh, also, the DHCP network problem we had with the 2nd batch of arrivals was unique to that batch, 6 machines. We had to plug those into a small router and scan for the IP address, then change the settings to a static IP on our network. All of the new arrivals come up on our network fine at boot.

yeah  I can feed it 120 or 240

and make it send out 110 or 220

The cable  is 14 gauge  which can do 15 amps.  It is rated to do 22.7 amps continuous but with the cable they put on it   it is more like 12 or 13 amps 24/7/365

13 x 220 = 2860 watts  

which would be 1 s15 at low   and 1 s15 at high   say  2500-2600 watts 24/7/365

if I get in the mood I may  open it op and see if I can mode it to do 3500 watts 24.7.365

I have a similar device, but you can't feed mine with 120v, the min is like 180v or so.
I'm powering a quiet R4 at home with it, but it can power an S9 just fine.

From two phases (our residential service is like that in US for office buildings) i would theoretically get 208v, but... a tester shows 203v. Thanks to that device, the R4 is actually getting 220v just fine, and the electricity here sometimes fluctuates so it has kept the miner happy (its NOT using an APW5 mind you, but some hp server psu with an adapter).

@ yankees.

I purchased this item  in theory it will put out 220v +/-  5%  so 209-231

https://www.amazon.com/gp/product/B071V5NXZV/

My input is 243.1 and my output is 220.7 on my hand held meter

the meter on the unit read 243 in and 220 out.

I am testing it with an old s7ln  before I put it on the s15

I will post a photo very soon.

Since it is the 5000va model  I think  it can do 2 units.

of course you need to feed 240 in to run 2 units.

I am using this to stabilize not step up 120 to 220  or step down 220 to 110
To be safe I am running a cheap piece of gear on it. Not the s15