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off grid DC system for cryptocurrncy mining rig !

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Hello All

I need your help on setting up my off grid solar system based on my needs. I'm building this system to try out mining cryptocurrency 100% solar powered. Currently, my system has the following:
- 4x 6v golf cart deep cycle batteries 400ah that are wired in series and parallels to get 12v and 800ah (Will add more in future)
- 6x 320w 9amps solar panels. (Will add more in future)
- Midnite classic 150 charge controller.

I'll need about 500watts 24/7 for my small cryptocurrency rig as a start (I’ll turn off the system for the rainy/cloudy days).
As you may know, computers run on 12v. With that being said, it doesn't make sense to use DC to AC inverter to convert it to 110v AC and use the regular 110v AC computer power supply to convert it back to 12v DC (5v and 3v along with 12v). So I start looking at DC computer power supplies.
From my research I noticed there are limited choices of computer DC power supplies.  

Here are the options that I found so far:
- hdplex-400w.
This will run on voltage range of 16v-24v. That means I'll have to change my battery bank to 24v (I'll have less amps hour (400ah)). Also, I'll need a 24v regulator to regulate the output from the battery since the maximum volts for that power supply is 24v and the battery bank could give little more than that when it’s fully charged or when the charge controller is in charging mode.
A link for the product: https://www.hdplex.com/hdplex-400w-hi-fi-dc-atx-power-supply-16v-24v-wide-range-voltage-input.html

- PSTC-12500 car PC power supply 9-18 VDC, 12 volts nominal 500 W
This will run on DC 12 volt nominal, 9-18 VDC INPUT. It’s expensive and has 65% efficiency.
A link for the product: http://www.powerstream.com/DC-PC-12V-500.htm

- PSTC-24500 car PC power supply 18-36 VDC, 24 volts nominal
This will run on 24v. It’s less expensive from the 12v one and more efficient (Efficiency %75)
A link for the product: http://www.powerstream.com/DC_PC.htm

-  Rock Power 500SV DC-ATX ATX Power Supply Supplier 12V Input 500W
This will run on 12v. I’ll need a 12v regulator too for this one. Also, not sure if this product is reliable.
Link for the product: Here

-  Lastly, I have an interesting idea. As you may know the mining rig consist of multiple graphics card that mostly take all the watts. They run on 12v only (unlike the motherboard that needs 12v, 5v and 3v). So, I’m thinking of running the motherboard on a low watt (80w) 12v dc power supply and run the graphics card directly from the battery (Of cause with a 12v power voltage regulator to get a clean 12v from the battery bank). The problem with this idea is that I couldn’t find a voltage regulator that can provide high watts.

Now, Iam trying to figure out which route will be the most efficient/low cost for my system. If you have a better options, please share it 

Your advice is highly appreciated!
Posts: 1329
Location: Massachusetts, 6b, suburban, nearish coast, 50x50, full sun, 40" year-round even distribution
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Don't know a lot about this area, but it might help to have you share more what the big picture goal/goals is/are here.  Financial independence? Flat-out getting rich? innovating with cool gadgets?  changing the world through currency?  making power from sunlight? optimizing use of roof space?

From what I hear, the cryptocurrency thing as a whole is costing a huge amount of fossil fuels to maintain--the expenditure of the entire country of Ireland is what I read recently, about bitcoin--so it's not long-term a very sustainability-focused option.  

As a transitional tool to get you financially independent, it may be worth it.  But in that case, you're better off just running off the grid, tying to the grid, selling power back to the grid a bit to offset some of what you use...in other words, are the reasons for being "off the grid" (as in not-tied-to-the-grid) really good reasons, or is the real desire to be making use of your roof space? if it's the latter, hold off on buying power supplies and batteries (beyond actual emergency needs--and you can probably get a car battery for cheap or free for emergencies, or a generator) until someday in the future when you have a really compelling need to be not-grid-tied.  

It may seem less exciting, but it's actually better for the planet all around.  Less embodied energy in buying those extra gadgets.

If your main goal is financial freedom, there are some great resources for that on this site--like mind-blowingly great.
Joshua Myrvaagnes
Posts: 1329
Location: Massachusetts, 6b, suburban, nearish coast, 50x50, full sun, 40" year-round even distribution
kids trees urban writing
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And as I just realized that DC probably means current, not Washington DC, where are you located?? if you're not near a grid then disregard that part of what I posted...oops.
Posts: 534
Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
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This will only yield losses and waste.
Grid electricity is cheaper and this is what determines the cryptocurrency market.
It will be far more expensive to do this off-grid.

- The hardware has to run all the time to be profitable. (Would require expensive batteries)
- You also need fairly new hardware to be profitable.

However, if you can setup a good hydropower system and good internet connection, it may be worth it.
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