Hi Ronnie,
we have tried groundnut last year, rainfed, in little more than a acre .
Mistakes bcs of which we occurred losses is as below :
Groundnut immediately after harvesting was not sold, its general practice to sell it asap, since weight will be more and you get rate approximately.
We tried to store it since it was a rainy season and it was too laborious to put it sunlight and again put it in bags when its rainy .
During the process it lost good amount of weight(40-50 %) and when sold in market it was big loss.
So if you are willing to store it, better way is get a machine to separate nuts and then its easy to store (many KVKs will have smaller manually operated machine for this).
Groundnut is labor intensive, its better to use raised bed method, it saves good amount of seeds (atleast 30%) + lesser labor for harvesting and more production .
Hope it helps .
Thanks,