Sounds reasonable.
While fans are very beneficial in a residence allowing one to run A/C less in off-grid, they are pretty brutal. These are about 15% of your total battery capacity.
Seems high unless you're running 10hr/day.
Well, you just covered it with your 8 panels. Better in summer. Worse in winter.
Diminished loads in winter.
Yep.
12V achieved via 48V to AC to 12VDC will be about 70% efficient.
Nice! Was wondering about heat.
You really want the generator to be the outlier, i.e., when weather is just trash OR if you really have high demand items it doesn't make sense to power via solar. My friend used to have to run his generator every time he wanted to pump out of his 700' well - a couple hours a few days a week.
Given the cost of panels, another $400 to double the size of your array is hands down the best bang for the buck.
"Building upon" needs to consider the end goal. Unfortunately, without that level of planning, you may find that this is system #1 and will be replaced with system #2. It's probably not in your case, given the scalability of the unit.
This by an order of magnitude. More battery doesn't help you when you're consuming more than you can replenish. The battery just limits you on power expended between charging. You already have the generator to make up for that. I see it this way:
$1500 for 5kWh of capacity
$500 for 8kWh of solar
That's generally how it's done, but with only 2P, you don't NEED one. You technically don't even need fuses/breakers on 2P - only 3P and more.
Your ground mount will be double, but DIY can be pretty cheap.
Not so much compensating for it, but it helps. It makes power use more flexible in that it would widen the hours in which you will be producing elevated power at the expense of peak power at noon. It would look like this:
View attachment 79256
Red horizontal line is max array. Blue/red bell curve is a south facing array (jagged stuff is clouds). Red lumps are SE + SW arrays.