You should really show your power generation over a day to understand this better. If you can generate free power during the day, calculate how much you’d spend to cover the rest of the day. Without batteries, you're gonna face issues trying to mine 24/7.
This is completely wrong. Sunlight does not work 24 hours a day and does not work 100% efficiently. Therefore, without a battery system, the mining farm will operate for approximately half a day, and to calculate Energy Production= solar panel per kW * sunlight hours per day * efficiency factor
Electricity is one factor, but you have the space, budget, cooling, capital recovery and need batteries because the mining farm needs to operate 24 hours.