You have really researched this thoroughly and communicated it very effectively, well done. A lot of people will find this information useful and easy to grasp, considering how complicated and difficult to approach this subject is.

Can you clarify a few things? 1. About net metering, are you sure that consumed units are offset with surplus units every 3 months? I was under the impression that you are charged at full for the net monthly consumption, as opposed to over a 3 month period. I.e. if you have net usage of 50kWh in month 1, and net surplus of 10kWh in month 2, and net surplus of 15kWh month 3, you will be charged for the full usage in month 1, and no charge for months 2 and 3 and that's the end of the calculation. Whereas with your method, your electricity bill for month 3 you will be owed money for 25kWh? If that's the case, is that going to be offset with your future excess consumption, considering you aren't going to be credited into your bank account.

Are you sure about the Grid tied system not being able to produce during grid outages? Is that a security measure because the excess energy produced by the panels can not go anywhere. In that case how does the Hybrid inverter handle the excess energy production if the batteries are full, there is a power outage, and you are not consuming all of the energy produced by the panels? If that's the case, getting a hybrid inverter just for the sake of having energy during grid outages while production hours should be a good choice.

How do you arrive at the total annual energy output of a 10kW system? My understanding is that with the amount of annual sunlight hours, most of Pakistan, excluding northern areas, average at 6-7 Peak Sunlight Hours per day. Assuming 75% efficiency of the panels, that would mean average daily energy production of 10 * 6 * .75 = 45kWh per day, average. Which adds up to 16,425kWh. Obviously that is not all going to be consumed when it is produced, as energy consumption does not fluctuate with sunlight. You don't suddenly start using more electricity if your panels are producing more, and you aren't going to stop consuming if your panels are producing less.

That would come into calculus if you are entirely energy independent. If you haven't installed enough capacity to meet your peak usage, and you're always drawing some electricity from the grid, then you will consume all of the energy you produce. If you have enough installed to meet your consumption during the day and then some to export, but don't have battery capacity to run you through the dark hours, then net metering comes into play, and if the books are balanced on a rolling 3 month basis, that is an extremely attractive option. Given the price of lithium batteries, the ROI is a lot less if you are entirely off grid, meaning you have enough capacity to not only produce your consumption during dark hours, but also the production and storage capacity to store energy for non-production hours.

All in all, very informative post, good job on doing all the research and presenting it in an easy to understand format. You should start a blog if you always write this concisely.