Buying 3 Antminers S7 or 1 Antminer S9?

[sarakuka]

I have atm 4 miners mining at CKPool kano.is.

2. Antminer S7 4.73
1. Antminer S9 11.85
1. Antminer S9 13.00

I'm planing to buy 3 more antminers S7's. That it cost for me only 1700$ with shipping/customs fee all to buy 3 S7's.

Buying antminer S9 13THS costs way higher up to 2500$ with free shipping plus customs fee.

I know that 3 Antminers S7 electricity cost is higher but I have a very cheap KW and I have two of S9's on solar panel(planing to extend to put all miners on solar).

So electricity is no problem for me atm. Since I really don't have 2400$ but I have 1700$ and electricity cheap I can pay everymonth from the income of my miners.

And calculating 3 antminers S7 4.73x3=14.19ths. I'm mining at kano.is and planing to stay there.

Would like to know your opinion for my idea.

Thanks

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[Rupucers]

I would go 3x S7 if you have cheap electricity. With expensive elec. would go for S9

[kano]

Well any mining has to take into consideration initial cost and running cost.
Bitmain hopes you are stupid and don't consider both. Fact.

So yes if you factor both in and find that one setup comes up with a better result, then indeed that makes sense.

There's of course the issue of miner lifetime - so you'd have to read around about the average reliability of an S7 vs an S9.
It would seem that 10% failure rate is somewhere in the ball park of what to expect on a typical miner - but YMMV.

Also of course don't forget that difficulty increases
That really doesn't factor much into what you are comparing, but often people look at the long term and don't factor in difficulty changes at all.

[sarakuka]

Well any mining has to take into consideration initial cost and running cost.
Bitmain hopes you are stupid and don't consider both. Fact.

So yes if you factor both in and find that one setup comes up with a better result, then indeed that makes sense.

There's of course the issue of miner lifetime - so you'd have to read around about the average reliability of an S7 vs an S9.
It would seem that 10% failure rate is somewhere in the ball park of what to expect on a typical miner - but YMMV.

Also of course don't forget that difficulty increases
That really doesn't factor much into what you are comparing, but often people look at the long term and don't factor in difficulty changes at all.

I'm a noob and dump think so since it was hard to understand what did you mean.

Is it worth buying 3 S7's or should I think only about S9? If you can be more directly.

[philipma1957]

Well any mining has to take into consideration initial cost and running cost.
Bitmain hopes you are stupid and don't consider both. Fact.

So yes if you factor both in and find that one setup comes up with a better result, then indeed that makes sense.

There's of course the issue of miner lifetime - so you'd have to read around about the average reliability of an S7 vs an S9.
It would seem that 10% failure rate is somewhere in the ball park of what to expect on a typical miner - but YMMV.

Also of course don't forget that difficulty increases
That really doesn't factor much into what you are comparing, but often people look at the long term and don't factor in difficulty changes at all.

If your power is cheap under 4 cents a kwatt   the s-7 is the way to go.

If your power is 7-9 cents the s9 could be better.

The  worst problem for the s9 is break downs.  I have some spare parts on hand for my s9s'  2 controllers

a link for the s7 controller if you buy the s-7

https://bitmainwarranty.com/shop/products/us/s7-control-pcb/

a fan link for you
https://bitmainwarranty.com/shop/products/us/fan_s7/