I'm looking at this from a totally different angle.
Also this is more of a, can it be done project, I'm not expecting to get rich but if it can make profit I know I'm on to something interesting.
The reason for all this?
If it works we plan to build out a total Off-Grid Mining Farm in West Texas.
Interesting.. but with discrepancy on the goals.
Computing ROI with the mining equipment alone will surely return with positive result no matter how long it will be.
(
use any of the famous mining calculators online like whattomine with 0$/kWh electricity cost)
No one can predict the future so calculators can only calculate with the current profitability.
However, regardless of your result, you still need to include the additional cost of your off-grid solar system to ROI since the end goal is to build an off-grid farm.
Or is everything already paid just like the additional 40kW panels you have now?
Yes, mostly paid other than more inverters and mounts for the panels.