it seems to make sense to me to start with the less variables, X amount of panels, produce X amount of power (factoring in location) and cost X amount of money, with that info i know what i can run and if its not enough try to increase my budget BEFORE i buy the wrong equipment
either way, in my view, the main thing is to understand how much it costs, and the lifestyle you need to lead to live on stand alone.
People talk about stand alone as as alternative to mains power, its not, The breaker for mains power in a house in Australia is I think normally 60a, so you have that power avail basically, 24/7, you can plug in a welder, compressor and a heap of power tools, have the hot water boosting, lights, tvs, acs et etc all going at once. the only consideration you have is cost to use the power, its always there if you want it.
To have that lifestyle on stand alone you would need a minimum 20ka genset on auto start and you would use a heap of fuel.
You keep mentioning variables, and thats the hard bit for sure, friends come to stay, you have more lights on, the fridge and freezer are openmore, they bring portable fridges that they want to plug in etc etc.
I had a bit ti do with stand alone before I bought my own system, thought i new a bit about stand alone, After living off a stand alone system for 5 years now I realize I new VERY little about it, I can tell you that If I new then what i know now there is no way i would have purchased a property without mains power.
Thats why I often comment that living on stand alone is a pin in the but
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