you've paid back your initial upfront cost more than a year sooner than estimated, and your energy production has more than eclipsed your usage since installation.
and
What's your MWh total production since installation if I might ask?
both need the same answer. I installed about 7500 Watts of panels on my roof and expected to get about 7500 kWh of production per year, based on the estimates from websites and solar installers, but have instead been getting closer to 10,000 kWh per year.
Since my panels went live in July of 2014, they have produced 42,834 kWh. I just walked outside and looked at the production meter. That's 42.8 MWh in 4.3 years, or just about 10 MWh per year, and it's been worth about $800 per year in avoided utility bills because we only pay about 8 cents per kWh instead of the national average of 12 cents/kWh. That includes some down time when one of the inverters went out for a month and had to be replaced (under warranty, free to me).
Our household energy usage has also risen significantly since installation, almost doubling after we added the Leaf and replaced our gas furnace with the heat pump, but this still works out okay. It turns out to be more cost effective for us to use that surplus solar power to displace the gasoline in our vehicle than to sell it back to the grid, so from a financial perspective we're shooting for net zero, with no surplus. This year will be close.