If I understand you right then you need this device  https://imgur.com/a/q9A9g   
this is just sample link: https://www.vps-ups.co.uk/eaton-sts-16a-2-x-c20-inputs-2-sets-of-3-c13-outputs-1-c19-output.html

For a combination of solar and wind power, you should look for solar and wind charge controller.
There is plenty information about that on the internet.
 
You could look this variant maybe its a right thing for you link:
https://www.alibaba.com/product-detail/10kw-off-grid-solar-inverter-without_60320221759.html

I would recommend to look at:
HX1200i Link: http://www.corsair.com/en-eu/hxi-series-hx1200i-high-performance-atx-power-supply-1200-watt-80-plus-platinum-certified-psu
or you can choose EVGA SuperNOVA 1300 G2 link: https://www.evga.com/products/product.aspx?pn=120-G2-1300-XR  
 

Information and calculation of energy consumption:
 
ZOTAC GTX 1070 AMP Core Edition    
Power Consumption 220W 18A  x 4 = 880w 72A
Information is taken from a website. You could power limit the cards for less consumption.  
 
KFA2 GTX 1070 mini
Power Consumption 150W 12.5A x 4 =  600w 50A
Information is taken from a website. You could power limit the cards for less consumption.

 
I agree with NotFuzzyWarm this topic should be at Altcoins.

Definitely a scammer website.
 
Facts:
1. There is no address in contacts.
2. Social media like Facebook, Twitter, Instagram are made with few post. No activity there.
3. Domain name is privacy protected not showing owner.
4. The website runs on WordPress with a cheap. template.

Strange question to ask for.

Use APC surge protector.

The answer to your question is yes you can run the third card 570 through Molex connector. Link: https://i.stack.imgur.com/RmxBl.png
Let's calculate. If one card consumes 150w (12.5A) then we multiply one card 150w * 3 = 450w (37.5A) plus we add CPU + motherboard usage some around 90w (7.5A) + 450w = 540w (45A) there are plenty energy to drive your PSU smoothly.

Looks like you have PSU problem. But I can be wrong.  
First of all, if you cannot get the signal to monitor then check the bios settings setup for an intended card.
Or you could change the HDMI to DVI adapter because I have the same motherboard and there are no problems with that.  
Problem with the "Display driver stopped responding"  cloud with the overclocked video card.
 
Cloud you draw a diagram of your wiring and add some information about devices you have?  
What kind of synchronizer do you have?  
  

Good looking monitoring software. Keep up the good work

Thanks for your hard work and effort.

I agree with Proc.dev It depends on your own skill.

Definitely, try out ASIC mining hardware.
For me, L3+ is the Beast.

Check it out this link: https://www.ebay.com/itm/Unassembled-GPU-Mining-Rig-Open-Air-Frame-Case-/222529908628  
You could build something similar. There are measurements that you can use.
 
I agree with others aluminum or metal constructions are more secure. But there are risks with metal too if you have no temperature, fan failure monitoring devices then you can end up with fire too.

Most of the cloud mining is scam pyramid. You pay money but not get the profit at all.

Try to Copy bios with ATIWinflash 1.4.5 then determine a lenght of file it's 256 or 512.
Modify with Polaris Bios editor I would recommend PolarisBiosEditor-RX5xx Series.rar Link: https://mega.nz/#F!M2x3kCaK!7bGtGTu2TKUQ0br25eQo9w
Then try to flash with ATIWinflash 1.4.5.
 
command:
atiflash -f -p 0 newrom.rom

Looks like fraud organization. Hidden information about domain small pictures of datacenter itself. Maybe I am skeptical but when a website is hiding information of legit company then for me it's a trigger of fraud.

This is definitely a good card for mining.

I would recommend Nvidia cards 1070 8gb, 1080 Ti for Ati cards Rx 570 8GB and Rx 580 8GB.

Try older version or use legacy mining software.