Are you sure it's as low as that?
My Intel i5-10400 uses 40-50w as measured by a power measuring socket and that's at around 5-9% cpu. I only have a cpu fan running and a single case fan which is on PWM and only ramps up if the CPU ramps up. Normally it's not turning. I have one SSD and single 4tb WD Purple HD. That's with 2 cameras and no console active, and no internet connection active (so no additional background processes). Add in the console and the range increases by around 10W.
BTW I highly recommend to everyone buying a power measuring socket, very useful for testing things. This one is from Amazon:
This is at the higher end of the range of power draw:
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I'm probably going to say that mine is 10w more than Looneys assuming he's measured his using something similar. Maybe the i7 is more efficient or maybe it's just the later processors draw more.
Also, to the OP, you can add on around 20w for 2 cameras for the cameras actual power draw from the socket including the poe switch which also needs to be powered.
Another point with solar, don't forget the energy requirement is 24/7. If using battery storage (which you need obviously because the sun doesn't shine at night), then you also need to factor that 24/7 requirement in. I think I'm correct in saying that that if you need 80w 24/7, then you're looking at much larger panels than you at 1st glance require. I'm no solar expert so please take advice from an expert, this is just my off the cuff non fact based opinion. But based on 8hrs sun a day that's a potential 240W requirement (80 x 3 (3x8hrs in a day)). Add in the fact that not all days will generate or be sunny and the panel will produce far less, and I'd guess you're probably going to have to at least double the size, maybe even more because a shaded panel can quickly fall to a fraction of it's rating and cloudy or rainy days can knock outputs massively. In addition, with every panel increase you also need the storage increase. As said, I'm no expert so please consult one. But my guess is you're potentially looking at a much. lagrer system than you may think.