Carbon emissions of solar panels?

[Excession]

Home electrical usage might be highest when it's dark, but overall usage is highest during the day. So when your solar panels are being shined upon but nobody's home to use the power, you sell it back to the utility company, which in turn sells it to the offices, factories, and other customers who are using power at that time.

You're right, I think what I was looking at was a graph of household energy use, not overall. There is still the duck curve problem, where solar delivers plenty during the day, but can't meet that household peak that at 7pm or so. The more pronounced that curve gets the better the business case for energy storage, but until you have enough storage you still need the traditional generation capacity to cover the peak.