Glad to hear you are able to export more than you imported.
I think it is that you are watching you usage for one thing; therefore, you are not just wasting electricity on unnecessary things plus all the LED lighting is reducing you demand on cooling as there is a lot less heating that the old incandescent bulbs gave off. Plus your neighbor just cut down his trees which may have been affecting the solar panel system too. Just depends where your panels were located.
Here when I first moved in I was a lot electricity as the bills were in the 250-300 USD range and now with all the energy saving devices I have installed it has has been over $150 and that with the resistance heating elements this winter. You be surprise how much those old electrical adapters wasted too. Many of the newer ones are switching type and not the old linear transformer types.
