Yes philipma1957, I am also considering whatsminer m60's and gear. They might be the best of the Miners currently based on reviews. Thanks for the tip and for the introduction/recommendation to mikeywith!
STOP! Don't get those servo voltage stabilizers; they will most likely not work with your electricity. More on that later, but before I go there, I need to explain something that the "seller" did not.
I asked my seller, and he assured me "100% true output power," meaning 20000 watts (20KVA).
He is lying or knows nothing about what he sells. There is no way in hell you would get 20KW from a 20KVA transformer; you need to break physics to achieve this. So don't listen to him and always assume a power factor of 0.8 to 0.9, which is a loss of 10-20%. The best this thing would give you would be 18KW, although I doubt that.
The second point is when you see a regulator/stabilizer rated at 20KVA, it means that is the possible output when the input voltage is at whatever the device is rated. So if it outputs 220v, then you must supply it with 220v for it to achieve the maximum capacity. Going under 220v on the input will decrease its capacity. This, of course, depends on the make of every stabilizer, but here are some average figures from a top Vitmeness brand that probably beats whatever you found.
For a 220v rated device, you get 100% capacity down to 200v.
At 175v input, you get 75% of the rated capacity.
At 150v input, you get 50% of the rated capacity.
So going with the assumption that your input voltage would drop to 150v, then to be safe, you would need to do the following calculations:
20KVA to KW = 16KW (PF of 0.8, which is probably what it is for whatever brand you posted above).
At 150v, a loss of 50% gives you 8KW total, and that would be fully exhausting it. So you might want to drop another 10-20%, and that gets you down to 7KW max.
Now back to why "not" use a servo voltage stabilizer:
This type of voltage stabilizer is "slow to react," and it's best suited for places where input voltage is low and is always low, i.e., not variable, doesn't change every minute or so. Given that every time it reacts to a voltage drop, it will likely cut the power to your miner.
Key word is: steady input voltage
If your power is not stable and constantly changes, you will have to get a static stabilizer. Without going into much info, I would just share this video for you to learn the differences:https://www.youtube.com/watch?v=xbf_nQYZhbs.
@phill, thanks for recommending me; it's always a great pleasure doing business with you.
Good day mikeywith,
Thank you for your inputs!
I watched the video and now understand what you mean by the need for static voltage stabilizer. In order to know if I need a static voltage stabilizer, I'll test first my normal voltage with a digital meter as suggested by philipma1957. Depending on the test, you might be right, mikeywith.
With your inputs and the information from the digital meter readings, I'll go back to my seller to look, compare, and test the static voltage stabilizer versus the AVR (i.e. servo voltage stabilizers). I'll specifically ask the change of the input voltage to the percentage change in the rated capacity.
This tip is particularly useful:
For a 220v rated device, you get 100% capacity down to 200v.
At 175v input, you get 75% of the rated capacity.
At 150v input, you get 50% of the rated capacity.
So going with the assumption that your input voltage would drop to 150v, then to be safe, you would need to do the following calculations:
20KVA to KW = 16KW (PF of 0.8, which is probably what it is for whatever brand you posted above).
At 150v, a loss of 50% gives you 8KW total, and that would be fully exhausting it. So you might want to drop another 10-20%, and that gets you down to 7KW max.
I can see the physics of a decreased input voltage which would lead to a decreased rated capacity for the AVR.
[moderator's note: consecutive posts merged]
