Recently I got an opportunity for cheap electricity in an eastern european country. Price would be 0.05 EUR/kWH.
This is realistic.
Security in a 3rd world country
While in general Eastern Europe is safe, your business might not enjoy the same level of protection as in Western countries.
It seems there a already many mining containers there. I will need ...
The degree of efficiency (J/TH) is directly related to the microchip design and does not follow a linear path. The T9+ uses a 16nm, whereas the newest Antminers are thought to use a 7nm. Their efficiencies are 136 J/TH and 30 J/TH respectively. The curve is exponential decay. Older machines become redundant due to difficulty increases.
The high decibels are ...
You yourself have stated that your boards are failing to hash.
It looks like some form of system test against the boards is failing.
I know I am being captain obvious here.
chain: some chip cores are not opened FAILED!
Test Patten on chain: FAILED!
Until you can find the point of failure with a volt meter, or replace the failing boards.
You can try ...