Topic: 50kw Solar daytime only Mining Project (Read 42 times)

Let's compare ROI if electricity is of minimal concern, as it would be with a paid off solar power plant.
We can go into ROI's starting from scratch of a new buildout later.

I think the maths are good 

Comparing ROI of Older vs. Newer Equipment

Equipment Specifications

Antminer S19j+
Hash Rate: 95 TH/s
Power Consumption: 3,250 W
Price per Miner: $300


Antminer S21
Hash Rate: 200 TH/s
Power Consumption: 3,500 W
Price per Miner: $4,000

Proportion of Network Hash Rate

S19j+ Proportion:
Proportion = (95 × 10¹² H/s) ÷ (663 × 10¹⁸ H/s) ≈ 1.432 × 10⁻⁷

S21 Proportion:
Proportion = (200 × 10¹² H/s) ÷ (663 × 10¹⁸ H/s) ≈ 3.016 × 10⁻⁷

Expected BTC per Miner per Day For 24-Hour Operation:

S19j+:
Expected BTC/day = 450.72 BTC × 1.432 × 10⁻⁷ ≈ 0.0000646 BTC/day

S21:
Expected BTC/day = 450.72 BTC × 3.016 × 10⁻⁷ ≈ 0.000136 BTC/day

Adjusted for 8-Hour Operation:

S19j+:
Adjusted BTC/day = 0.0000646 BTC/day × (8 ÷ 24) ≈ 0.0000215 BTC/day

S21:
Adjusted BTC/day = 0.000136 BTC/day × (8 ÷ 24) ≈ 0.0000453 BTC/day

Daily Revenue per Miner

S19j+ Revenue:
0.0000215 BTC/day × $62,125.31 = $1.34 per day

S21 Revenue:
0.0000453 BTC/day × $62,125.31 = $2.82 per day

Payback Period

S19j+:
Payback Period = $300 ÷ $1.34 ≈ 224 days

S21:
Payback Period = $4,000 ÷ $2.82 ≈ 1,418 days

Annual Revenue and ROI

S19j+ Annual Revenue:
$1.34/day × 365 days = $489 per year
Annual ROI:
ROI = (($489 - $300) ÷ $300) × 100% ≈ 63%

S21 Annual Revenue:
$2.82/day × 365 days = $1,029 per year
Annual ROI: Negative until after the payback period (~3.89 years)

Investment Comparison

Investing $4,000:

Option 1: 1 S21 Miner
Total Hash Rate: 200 TH/s
Daily Revenue: $2.82
Payback Period = $4,000 ÷ $2.82 ≈ 1,418 days

Option 2: 13 S19j+ Miners ($300 each)
Total Hash Rate: 13 × 95 TH/s = 1,235 TH/s
Proportion = (1,235 × 10¹² H/s) ÷ (663 × 10¹⁸ H/s) ≈ 1.862 × 10⁻⁶
Expected BTC/day = 450.72 BTC × 1.862 × 10⁻⁶ ≈ 0.000840 BTC/day
Adjusted BTC/day = 0.000840 BTC/day × (8 ÷ 24) ≈ 0.000280 BTC/day
Daily Revenue = 0.000280 BTC/day × $62,125.31 = $17.39 per day
Payback Period = $4,000 ÷ $17.39 ≈ 230 days

Conclusion: Investing in multiple S19j+ miners yields higher hash rate and faster ROI compared to a single S21 miner.

I think you're counting the payback incorrectly. You only count the cost of asics, but do not count the cost of investment in solar panels and equipment.
In 225 days you will have recouped your investment in the asics, but what value will those asics have in 225 days?
As an option for gaining experience it's a good idea, but investing in such equipment is definitely not about business.

Interesting.. but with discrepancy on the goals.
Computing ROI with the mining equipment alone will surely return with positive result no matter how long it will be.
(use any of the famous mining calculators online like whattomine with 0$/kWh electricity cost)
No one can predict the future so calculators can only calculate with the current profitability.

However, regardless of your result, you still need to include the additional cost of your off-grid solar system to ROI since the end goal is to build an off-grid farm.
Or is everything already paid just like the additional 40kW panels you have now?

According to that S19j @  $300 will ROI in 75 days if mining 24/7 but since I'm only mining 1/3 of the day its more like 225 days.
How long will an $4000 S21 take to ROI and how many S19 can I buy for $4000?


I'm looking at this from a totally different angle.

Also this is more of a, can it be done project, I'm not expecting to get rich but if it can make profit I know I'm on to something interesting.

I realize that these asics are very cheap now, but the problem is that the profit is very low and it's dropping every day.
Large companies are constantly buying modern asics, and your profit will fall every day. I am sure that with such equipment you will have problems with ROI.
https://www.asicminervalue.com/miners/bitmain/antminer-s19j-90th

Here we go again! 

This new project will dynamicaly adjust the miners dependant on power available from solar.
The demonstration solar system when finished will have 50kw of solar panels, 40kw of inverters and 100kwh of battery storage.
We will only mine during the day and morning/evening using some of the battery but battery will be used mostly to smooth solar power during cloud conditions.
I plan to run 10 Antminer s19j mostly in low power mode at around 2200 watts each.
The system is located in Texas.

I have 10kw of solar and 11.4kw inverter already installed.
Still working on the 24kwh battery .
Another 40kw of panels are on site but I need to build out the mounts.

6 of the 10 Antminers in stock

Next step after the battery is to start up one Miner and develop a Python control script for,

Dynamic Miner Control

Adjustable Power Settings: The Antminer S19j supports different operational modes that can adjust power consumption and hashrate. We will utilize these settings to match the miners' power usage with available solar energy.


Response to Solar Output: Implement a system where miners ramp up or down based on real-time solar production and battery charge levels. This will ensure optimal use of available power without overloading the system.

I have done profitability calcs on this minus the Solar equipment because most of it was already bought and paid for years ago but I'll get to that later.

It seems what makes this feasible today is that you can buy S19 machines cheap.

The reason for all this?
If it works we plan to build out a total Off-Grid Mining Farm in West Texas.