Honestly if i had 40k to spend on expanding mining and you had the room, i would instead spend it on solar power... I have been shopping around local here to build a small solar farm on my property that i have all my rigs currently. Here in Florida you cant get a credit on solar unless you produce over a certain xxxx amount. So i have been shopping around and there is a solar panel manufacture called Sonali Solar in Miami, FL that quoted me some pretty amazing prices...
Pallet: 25 panels
305watt panels
$0.46/watt pricing
Small Container: 250 panels
305watt panels
$0.31/watt pricing
Or
A 50,400 watt complete system package
180 x panels
6 x 10.1KW 240vac inverters
Unirac 180 panel kit
cabling for kit setup
They priced me $33,675.40 shipped to my door, which comes out to $0.67 per watt if i do the install myself.
Right now im just trying to find out what permits and coding i would need to meet to install such a system, because if i could cut my $1500/month electric bill down to near $0 mining with the gear i already have, then that is a huge step in the right direction in the future of mining. Right now profits are a bit on the low side, so saving on electric seems more important in my book.... I could ROI on the solar in no time, since i would have to expand to use up the full 50kw in solar.
A 50KW solar system isn't going to cut your electric bill to 0.. you would need a 100KW+ system for that.
You can calculate it here:
https://pvwatts.nrel.govMy electric bill is around $600/mo, I'm in south FL and pay around 10 cents/kwh.
A 50KW system generates around 6400kwh/mo so that would bring my bill to 0.
For you to bring your $1500 power bill to 0 you would need a 120KW solar system. That generates about 1500kwh/mo.
Of course it also depends on how much you pay per kwh, but since you're also in FL it should be similar.