I'm still not getting it...
So, your motor and generator can provide 2000 W...
This 2000 W is available to power the inverter and charge the batteries...
The inverter is 90% efficient...
If it is consuming the entire 2000 W available then at 90% efficiency it is only making 1800 W for the mining rig.
The motor and generator head alone nothing else attached can produce 2000 watts if you use 500 watts to turn the generator head then you are saving 1500 watts worth or money right there. Now when you throw batteries and inverter in the mix you can increase the 2000 watts to much more power while still using only 500w to spin the motor. Yes you will have some power loss no doubt but as long as you are putting out more energy then it takes to get you to that point you are saving money
I also have designed a hydro type unit but that one is fully self powering and runs on water but those designs wont be released since I do sell many of them to lake home owner to power their dock lights.