I run very small scale solar mining as living offgrid and in summer have surplus electricity but would say consider how close you are to the equator, as currently, mid winter here in South Island New Zealand, I have had to drastically reduce mining just to keep the lights, fridge and internet running! That 3kw solar plant will probably be peak output mid summer. The seasonal variance in solar power produced by PV panels where I am roughly midway between equator and poles is considerable...maybe 3-400%. That said with 3kw you could run one serious mining rig of perhaps 100 plus TH...but only while the sun shines. I dont know how small scale mining can be profitable in a real time sense unless you are using solar power that would otherwise be unused as is the case for me in midsummer, but even there it will be years before I've covered the cost of the 4 Tb Nano3 and 1Tb Lucky miners. In the longer term who knows how much sats will be worth, but realistically home mining is more a hobby than a business...it is fun converting solar energy into hard, kyc free savings liquidity.