RE: MKBHD revealed how much electricity he is using per year. Mind-blowing number. But you have to consider this.
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I did the maths on my solar (After a year) about a week ago my TLDR:
Total Consumption: 8,832.7037 KwH
Average Daily Consumption: 24 KwH
Total Generation: 15,037 KwH
Average Daily Generation: 41 KwH
Total Energy Sent to the Grid: 6,639 KwH
Average Daily Exports: 18.13 KwH
In 12 months, I offset 23% of the start up costs of my system. So, in about 3.7something years, I'll be in profit, and still have 6 years of warranty left on my battery, and like 20 year of warranty on my panels. :)
There is no reason to pay for energy when we have an abundant resource. To call it renewable is a misnomer, because the sun won't technically last forever, but the best time to install solar (especially here in Australia) was yesterday. Energy bills are another form of control on consumers and industry.
4 year ROI time is really great. I think if one has a house and the opportunity to install a solar roof, one should go for it, considering growing energy prices for the grid and falling prices for solar panels and batteries, solar should be a no brainer.