Parroting the nonsense spewed by such a badly designed tool will do your credibility no favours
{t's not as simple as that, since it appears that the figures produced by that tool are what are used by SSE to make its 'policy decisions'.
I don't think the tool is 'badly designed', since it appears to do satisfactorily what it is designed to do (estimate the
maximum possible instantaneous load, with minimal consideration of any sort of diversity - the only lip services to diversity it plays are (a) that it estimates the first shower as representing an 8 kVA load, but the second and subsequent ones only as 4 kVA and b) that they regard "electric cooker = 'Yes' " as representing a load of 3 kVA. . What
is, I would say, questionable is whether that estimate is a reasonable basis for their 'policy decisions'
I became aware of this because a friend of mine applied to SSEN or provision of an electricity supply to a house he is having built. On the application form he had to provide information about the loads, and he specified what I mentioned in my previous post - an electric cooker (for which only yes/.no is asked), one electric shower (again, on;y yes/no and 'how many), one 7 kW EV charger, and no other specific 'significant loads'
As a result of his application he was told that he would need a 3-phase supply, because his estimated 'maximum (instantaneous' demand was too high or single phase (and SSEN do not provide new 'split-phase' supplies).
He asked for further clarification/inspection, and they indicated that they base their decision about the type of supply required on an estimate of 'maximum (instantaneous) demand', based on information provided by the customer, and told him that the on-line calculator they provided uses identical algorithm to the calculation they undertake. For the information provided (as above) that resulted in the following figures:
'Assumed standard 'background' maximum demand in a domestic property = 6.25 kVA
Electric cooker =3 kVA
One electric shower = 8 kVA
One 7 kW EV charger = 7 kVA
That's an estimated total of 24.25 kVA (105.44 A at 230 V) and, since it is greater than 100A, results in this ...
My friend is currently negotiating with them,but on the face of it, the situation would appear to be that, on the basis of the 'load information'; he has provided, they are not prepared to install a single-phase supply (whereas he is arguing that it would be ';adequate' if one takes a sensible amount of diversity into account).
I am therefore far from convinced that my credibility will suffer much as a result of my reporting ('parroting') this situation