And how many watts at midnight, with a new moon, in mid-winter? In other words, what is the average output over a full year, which would tend to average out daily, seasonal, and weather variation?
--Boot Hill
It's usually clear weather in San Jose. That being said, the best answer I can give is "enough". Enough to defray 90 to 95% of my energy bills. Call it an average of about 1/3 the peak 800 W. About 2 MW-hr/year.
At that rate the system will pay for itself in a mere 25-30 years, assuming constant energy rates.
I have a small array because the state of California forbids selling electricity to PG&E, but only allows credit towards usage. Our ever clever Governer Grayout now wants to TAX solar energy...