Blog Post from a Solar Power Installer (my alternate title: How the Non-Tesla Faithful view the PowerWall):
Elon Musk's 3-Biggest Powerwall Whoppers
Elon Musk's 3-Biggest Powerwall Whoppers
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I don't see a link in your post.
Many "normal" sized homes use as much as 25kWh per day especially when AC is used during the summer.There is no way anyone except huge mansion owners should have energy usage nearly as high as 25 kwh/day.
Jenal's estimates for average home energy usage are ridiculously high. Especially for Pasadena, where he is, which has no significant heating load, and where the houses are generally new enough that they aren't single-wall masonry. There is no way anyone except huge mansion owners should have energy usage nearly as high as 25 kwh/day.
I conclude that he's probably routinely committing an act of professional malpractice, selling people solar panels without first selling them much cheaper and much more effective energy-efficiency improvements. I notice that unlike many other solar installers, he *doesn't* have an energy efficiency section on his website.
Redoing all the numbers with *realistic* energy usage levels kind of trashes his conclusion. Musk is still overselling a bit (most people will need two Powerwall units), but not much.
I wish he had quoted more efficient panels. We have a 21kW system on our roof - 40 panels, made by SunPower. They put out 345W rather than the 240W with is the norm. I can't imagine another 20+ panels and not getting the same efficiency!
Hey that's a good point. Math is no longer my strong suit. And this solar is new to me. I think I confused something. I just pulled up the lease agreement and here's what it says:21??
40 x 345W = 13.8KW
Hey that's a good point. Math is no longer my strong suit. And this solar is new to me. I think I confused something. I just pulled up the lease agreement and here's what it says:
40 panels, 13,8kW DC, 11.4kW AC
Year 1 production estimate - 22,348 kWh
So when people are discussing the size of their solar setup, they're talking about the total kW of the panel count * wattage of the panels?
I've been telling people the kWh value. Geez I feel naive now. My apologies for the err and thank you for getting me to figure out the truth.
Summer usage for me is about 75kWh per day and 36kWh in winter
Not exactly a mansion at 2400 sq ft either.
Man. I just looked mine up a few days ago. My 4100 sq ft house averages 104KW a day. A high of 142 in July.
That includes an average of 22KW of Tesla charging a day, and an undersized A/C system that runs near constantly in summer.