you need to go big with this type of thing otherwise you will only earn few pounds like he said in the video
but at leats it remain profitable, maybe because he sold old miners to have the new equipments
It is a neat idea. But going big with this is just not best way as far as profit. Look at all that equipment for 1 S3.
I consider solar and bitcoin mining two different investments.You will make ROI much quicker from finding cheap regular electricity. Then there is no additional equipment cost for something such as solar. I wish solar or wind made sense but just does not large scale compared to moving to the cheap electricity.
This is it exactly. Its 2 separate investments that produce their own income,
1. You can sell mined bitcoins
2. You can sell solar electricity
so why not keep them separate from the beginning?
Also, most of the time you get a fixed price for feeding-in solar generated electricity. This could be e.g. 15 ct/kWh. Now, if you mine less than 15ct worth of Bitcoins with 1 kWh (aka a 1000 watt miner running for 1 hour) then it is not worth it any more to mine coins, but you would be better off selling your electricity.
The other thing is if you already want to invest in solar power at the same time, I am not getting why it has to be directly connected to the miner if you live in a residential house. Just attach solar power to your home network feed back and forth in the grid depending when you use more or less than you generate and simply plug your miner in the sockets. Using the national grid as a battery is the cheapest and most reliable option.
Nevertheless, it looks like a nice project and must have been a worthwhile learning exercise. If one has a few panels lying around, why not make them pay back for themselves.
