Im guessing it costs about $30 a day for electricity.
$30 a day
$210 a week.
$900 a month.
Currently ZEC = $60 usd. Just some numbers to think of when the prices are this low.
You could be buying about 15 coins a month for the price you are spending on the electricity.
For the price of your hardware($2k X 10(z9s) = $20k) you could of bought around 330 coins.
At the current rate of 36 coins per month, you would have to mine for 9.1 Months to break even.
(36 per month) x (9 months) x (60 per coin) = $19.4K usd
HOWEVER electricity cost during those 9 months (9 months) x (900 usd) = $8,100 = could of netted you an extra 135 coins.
If you were to mine them you would end up with…
Mined them, NOT including electricity = 324 …(36 per month * 9 months = 324)
Mined them, Includes electricity cost = 189… (324 coins mined) - (135 cost of electricity in coins)
If you were to spend the same amount of money on coins right now, vs what you get in 9 months mining…
Bought them = 330…($20k from hardware) / (60 per coin ).
Bought them = 135 …($8.1k in electricity) / (60 per coin).
Bought them = 468…($20k from hardware) + ($8,100 in electricity) = $28,100 / (60 per coin) = 468.
You could have about 468 coins right now in your wallet vs 324 in 9 months, and if difficulty doesnt go up, also you have to sell some of them to pay for the $8k electricity bill. You can even DOUBLE the price of zec and it would still be wiser to buy the coins vs buying mining hardware right now.
For people looking into mining right now, your much better off buying the coins and selling them in a few months when they go up in price. Then buy some miners with that money if your still interested in mining. Right now is a great time to buy some low priced coins, dont try to mine them.
NOTE: When buying the hardware, you do own the hardware and can resell it for a price, however ASICs lose value faster than a brand new car. You will most likely not be able to resell them for anything more than 20% of its value in 6 months,so you can add a few coins to the mining numbers if you plan on selling them later.