Topic: Swedish ASIC miner company kncminer.com - page 301. (Read 3049515 times)

This has all been asked, and answered multiple times by others, in a lot of different ways.
I'll add to the confusion :)

Neptune power info.

The approximate approximations.

(Neptune Advanced page Watts)  + (15% for VRMs) + (10-20% for PSU) = Watt @ wall.

ASSUME stuff is gonna use more for safety.

A shortcut is add ~33% to ASIC Watt for wall Watt.
Another shortcut is subtract 25% from wall for ASIC.
SSDD

A typical example:

Neptune Advanced reports
1500 Watt
That is how much the ASIC consumes.

To find out how much 12 VDC to feed the VRM to get 1500W out, add about 15%
1725Watt
That is how much PSU you need minimum, if ya blink it's gone in a puff smoke.

To find out how much WATTAGE you need at the wall add about 17.5% (unless a 90+ PSU @ 50% of capacity)
2,027 Watt 
@ the wall.

If you start at the wall you get different results not a perfect method.

Also important is the amount of Amps(current) needed in each wire in the system.

Cool Wires care about Amps(current ). Goog "AWG"
Wire INSULATION and nekkid wire spacing cares about voltage.

Watt / Volt = Amps

2000 Watt / 240VAC = ~8.5 Amps per Neptune.

2000 Watt / 120VAC = ~17 Amps per Neptune, more than some 120V circuit.

1725 Watt / 12 VDC = ~144 Amps. 'rail' in PSU needs more.

Each cube wants ~30 Amps to single PCIe connector.
10 Amps per wire.
if one wire fails
15 Amps on remaining 2 wires.
Modular PSU have twice the exposure with connectors on each end of wire.
A hot END of a PCIe might indicate a connector issue before smoke if different between cubes.


It is possible to MAKE 240VAC at home with 120VAC, may not be safe, wise, or legal.
You NEED the ability to measure 240VAC for it to work.
I do not advocate it (nor ever do it if it is ill-eagle where I live), 
just a creative solution that has flaws.
Most 120VAC houses have 2 'legs' split among the breakers.
Every other breaker is a different leg usually.
2 plugs on different 'legs' will have 240 between the black(USA) wires. (small prong on USA outlets with large/small)
You usually have to check between  'ideal' outlets and further ones till ya get 240VAC, 
measured between the small prong in an extension cord and the small prong in different wall outlet.
If those were connected to the sides of a 240 wall outlet (6-20P) mounted in the proper enclosure,
you can run a 240 supply in an unmodified 120V house. 
Could also have 120 available on seperate socket, black from one side and white from same side. Unused white wire can be covered with wirenut.
Metal enclosure and mounting mandatory, get the ones with rounded corners!
They sell cable exits to install in the enclosure knockout holes for the wall plugs.
They sell couplers to join boxes together. 
The boxes often have different size knockouts.
Get the ones that fit the knockout plan you want to use.
Or make it work with what you end up with, lol.
If extension cords are involved go big 12/3 or calc what U can get away with for the length.
DO NOT NEGLECT THE GROUND wires, screw them all to the same place in the box if possible.

Then things like large PSU USED for $50 become possible.
https://litecointalk.org/index.php?topic=5854.0

Still gotta connect them though.
https://bitcointalk.org/index.php?topic=379677.0

2kW connector boards soon(would also work for DPS 2500, 1800, & 1600), 
750W PSU connector, I think he had some 750 bundles. Be sure to get a PSU with published input voltage as apropriate.
The 750 PSU's last I looked were $10 a pop on Ebay. 
$40 for 3kW USED but are not the only things needed.

I think 
sidehack https://bitcointalk.org/index.php?action=profile;u=130792
 and 
CABLEZ https://bitcointalk.org/index.php?action=profile;u=54059
both make PCIe wires for coin.
Others have mentioned similar PCIe solutions here too, check them out.

You need wall power cables too.

No claims to anything above regarding calculations, ideas, vendor apropriateness.
I pre-ordered some DPS-2000 boards.
All I know for sure is the pics look cool!

Flexability, options, backup, food for thought.

YMMV
:)