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It all depends upon the price of Zcash and whatever I'm mining. I'm able to change codes and mine other coins. I run all my stuff off 4 solar panels and 2 garage wind turbines. I have a battery bank in my attic and keep it full. So I cant be specific on how much energy it would cost. I should profit 300-600 a month

So is the most profitable one to run at a time? I looked into Ethereum mining rigs when it was trading around $50, but never pulled the trigger.

Ya exactly. I have a profit calculator I use to determine what to mine and when based on the trading price.