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I can't answer your questions but I can tell you that since we installed our 9 panels a few years ago, the worst bill we have received was 220 pesos for (then) one month and that was while one of us was having health problems and we ran a room air conditioner quite a lot because of that. Like SunshineyDay, our last bill was 46 pesos which is the minimum for two months and represents the service charge for reading the meters. In a couple of months or so you will get a better feeling for how much power you are using and know whether you need those extra two panels.

The number of panels one has is meaningless unless you know the output of one panel. Years back they were all 128W, then 256W, now I understand they are over 300W. I have 20 panels each 128W or 2.56KW total. Know the total out put of your system and use that number to describe it. Number of panels is useless information.

The panel only shows what you generated. If you want to check total usage per day you have to read the meter let's say in the morning of day 1. At the end of the solar day or the morning of day 2 read the panel and again the meter. You take the net of the in/out of the meter and add it to the panel production. Unkess you are overproducing the meter net will be negative meaning you used some CFE power in addition to what you generated. In Ajijic the average sun hours per day is 5.7. You'll be using some CFE power overnight up until the time the sun gets high enough to start cranking out some kWh. At that point you'll use some and send the rest out into the system. I wrote a spreadsheet to enter the total production at tne end of each month to tell me the averages of my system over the year. Some months are better than others. After 5 years the averages aren't changing much.

Your output meter shows the production of the solar panels. It does not matter if that production is going to the house or cfe. Production is not affected by useage.

I ordered my system in 2007 and in those days there were occasional power outages, often for quite a few hours so I got not only solar panels but battery backup. Almost no one gets battery backup these days, because there are so few power outages. Oh and to brag a little I have 28 photo voltaic solar panels. But that doesn't tell you much because while each of your panels are rated at near 300 watts, my first panels were only 170 watts. I suspect that I would have maybe 20 panels at the higher wattage. Why so many? Mostly because of irrigation, I live on a steep hill on 3/4 of an acre I love my solar panels. Keep on checking your usage, it's fun. I check mine every morning and log it in showing the amount sold to CFE and the amount purchased from CFE.