going into winter there... my winter gen, is crapola, compared to summer.
figures:
recent winter lows (full sunny day) ~25kWhours. (overcast yeh could be 8-13 ish worst case)
most recent 'spring' day full sun ~ (the highest) 75.1kWhours
a gloomy overcast day with rain. solar gen is less than half of a full sunny day. a full range of light to dark conditions of course in between.
latitude 27.5 degrees south of the equator here.
btw, optimal gradient for fixed pv panels is supposedly the same as your latitude. (for all year round averages)
the ideal i guess would be panels that tracked the sun.
here it is north facing. there it is south facing obviously. some sneaky panels on the east and west too.
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i have no north facing roof available due to shading. so i have panels on southern roof as well. due to my location they actually produce very well in summer as the relative sun angles are favourable. in winter though i miss out on the favourable winter aspect/and lower sun angles. :-/ that is the problemo. desigining the system for Worst Case (winter) means i have not enough/barely adequate (gen.) in winter and way too much in summer.
but hey. exports support the grid. at least in the daytime...
my nominal panel ratings aggregate is 15.9kW East-West-South (should be north) orientation. 415W panels east west and 440W panels south. all bifacial type. ching chong china branded "Eging" and "Seraphim". two inverters, both 3-phase, 1X10kW and 1X5kW. 3 strings.
...and to fully cover my winter gen 'needs' i would need even more panels XD , plus batteries. winter is the problem. heating (in winter) draws are much larger than my summer power draw. and that is when insolation is the worst. <3 So, that is that, I will continue to be reliant on remote generation. in winter especially.