as i understood, there soon will be official ruul against multi ip in one fycical location
ok. 
i have 10 ip in different locations in Italy
how then do you have 0 power bill?
I have 3kw of solar panels and 6kw of battery. My adbsorbiment is 950/1000 watt max and i pay not plus of 50€/mounth of electricity, then 0 for all this hardware. i have others services on these servers for others scope
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then you have very good setup.
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I’m planning to build something similar.
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The size does not count!
Since its an Gang…ehhh Group-projekt 
Well, all the costs are just lumped into upfront costs for solar panels and battery, plus maintenance. Saying that’s its zero is at the very least misleading.
Where I live cost of solar power is barely breaks even with just buying electricity from the power company for 30 years.
I have solar and battery too.
It impossible to make predictions for Return on Investment because you need to make assumptions on the energy market over the course of 10 years. Doing that is a wild guess.
It is, however an investment that gives you a return that is at least as good as inflation rate (if not slightly better) without any tax liability.
Also, the non-monetary value of such a system is some level of energy resilience (power cuts become much less of a worry) and some emissions reduction (which can be significant in the UK if you shift your grid draw to times of reduced carbon intensity).
The last two are difficult to put in terms of a monetary value but they do have value to me nonetheless.
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