After some clarification, and requests received by e-mail carry a small selection that I think may be helpful to latria:
Many manufacturers omit the data of the inverter DC side Potez Max.
This is because it is strongly recommended to size the PV system to MAX DC side, but should be back on the nominal size in order to have an operating margin in particular cases of solar radiation and / or sudden changes in temperature, protects 'inverter *. (* Inverter which only the manufacturer knows the true maximum operating margins).
This obviously respecting the conditions of voltage, current maximum and minimum 'inverter.
The Power Max DC side in 'inverter is usually given by:
Imax (DC) x VmpMax (DC) = Pmax KWp
This power is clearly THEORETICAL , because the manufacturer does not provide information on the Power Max DC real usually greater than the nominal but less than that calculated . It 'also true that most likely will not be able to establish such a power inverter input, as higher than the value of Imax, Voc, and VmpptMax VmpptMin inverter.
E 'possible to verify that fact by applying this formula on a number of inverters in circulation, the values \u200b\u200bof the DC power Max recommended are significantly lower than those calculated using the formula Imax (DC) x VmpMax (DC).
Photosimpianti 1121 sizing runs on Nominal and if it exceeds the value thereof, indicates the overhead calculations showing Inverter Output hour did not exceed the Max DC power (theoretical and / or real ).
It is up to you to verify the optimal operating parameters, so 'as to all other software is generic, as the software course could not provide the optimal configuration in all possible cases.
E 'should therefore always check the configuration information and software manufacturers themselves.
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