First off I would like to say nice work and that I'm also into mining big time. I also design and laminate my own solar panels from scratch. I use the Sunpower Maxeon c60 cells you're using in your panels. I'm also an ex Nuclear safety inspector, SCE at the San Onofre Nuclear plant.
My concern is that you're claiming all this green savings and how your Solar Panels are powering your Mining Rigs and you make it sound like you have an energy surplus. Yet that 11.2kW array on your roof is the proper size for your house and no more. It's probably allowing you to "almost" break even for you homes electrical needs when you add in summer air conditioning needs. 17,976 kWh / 1,498 kWh per month or <50kWh a day. Those are your stats broken down.
As for powering your mining rigs? Let's be honest. Your home alone without the miners is probably averaging 50kWh's a day. I average 60-80kWh's a day without mining at my house is 100% LED's.
Your rigs alone are taking at least 133 kwh's per day + about 50kWh's per day for the rest of your home = 183kWh's a day on average for the year. I'm sure I'm off some.
You're MINING HARDWARE:
1x Bitmain Antminer S9 (link) 1,340 Watts
1x Bitmain Antminer R4 (link) 845 Watts
2x Bitmain Antminer L3+ (link) 800W x 2 = 1600 Watts
1x Bitmain Antminer A3 (link) 1,275 watts
2x Radeon RX Vega 56 (link) 210 x 2 = 420 Watts (500W counting the System they're running off on.
Just the Mining hardware = 5,560 Watts x 24 hours a day = 133,440 KWh's Per day and I'm sure I left out many things like the power draw from the power supplies needed to power the Antminers or any additional fans and cooling.
My estimate is that your solar panels are supplying only 27.32% of your homes total energy usage.
Also, you mentioned you're already at $40K in cost and saving $1,995.34 a year (btw: 11.1cents per kWh) That's over a 20 year break not counting tying your money up with no interest and inflation eating the value. Those 2 power walls are going to need $7K worth of new batteries every 10-12 years. Your solar cells will likely hold over 90% power after 30 years.
Sorry to sound negative.
It would be awesome if you would post your actual electric bills.