I am trying to understand the low wattage values that I'm seeing, because it seems crazy low. I'm not saying they are wrong, but I am trying to understand them better.
Reading around the Internet I did find out that the Kill-a-watt meter is considered good for it's price, but that it's sample frequency can miss large spikes. It appears that the cost to get more accuracy is a bit prohibitive at least to me and is in the $2,000 range. There is a cheaper digital outlet meter that does have a Max Wattage feature that could be useful.
They claim my meter:
Displays volts, amps, and wattage within
0.2 - 2.0percent accuracy
Looking at my setup.
The 2080Ti is supposed have a max TDW of 250W. The i9-12900 is known to be efficient and use lower power when many of it's cores are idle. My PC has a Corsair 1200W Gold power supply. However it's power efficiency is better when running closer to it's rated power so it could be losing another 5-10%. I'm not overclocking my setup and currently my 4 banks of DDR4 memory are only running at 3600MHz.
I was running a test drive in iRacing, so there were no other cars on the track and the GPU was likely only at about 65% based on earlier observations.
The 2 x t.racks 4x mini DSP's each have DC converters capable of delivering up to 12 W each, but are likely using less.
The EPQ-304 is only running at 2 notches above 0 at 80W max per channel (likely overrated), so it is not using much power.
That leaves the NX4-6000. Keeping in mind that even just pushing 1 channel at a fully rated 1500W and accounting for 90% efficiency of a Class D amplifier would mean 1667W pulled out of the wall which would nearly completely use an 1800W 15A circuit. So obviously there is no way that it could remotely pull enough power to sustain that load. This implies that it has adequate storage onboard to handle those peaks.
When you turn on the amp it immediately fills up the capacitors to give it a reservoir to pull from and in operation it just needs to top these off. What this means is that it "could" be driving peaks of 1000W to some channels without that load showing up on the Kill-a-Watt unless they were sustained.
However I know that I'm running my tactile at a lower volume than others. I'm running a base line 33% overall multiplier on my main BK and TST effects, where others are at 50%. There is a chance that the additional isolation of the pivot on my NLRv3 is giving me more tactile feel than having the isolation alone.
On the rig side of these numbers, SimuCube has suggested that the initial inrush current of the 2 x SC2 Pro power supplies can fairly high. I also know that the Meanwell PS's have a bit of buffer as well. My test at Road Atlanta only has one higher speed sweeping turn where the wheelbase load could build up, so the SC2 Pro could pull more power than I got in other situations.
I verified my SC2 Pro settings. I had the profile I'm using turned down to 80% or 20Nm and 45/25Nm in iRacing.
For the NLRv3 with a Max rating of 350W I'm quite sure I would get much higher power needs in a Rally environment where I was being thrown around more. I have the settings dialed back for track use and while I'm happy with how that feels on a track, it might be worth seeing how it looks in Dirt Rally 2.0.
Dirt Rally 2.0 would also be more demanding than iRacing on the GPU running it nearly flat out in the 90%+ range, so I believe there would be more power being pulled from both sides.
All that said even if the GPU did pull another 50-75W and the NLRv3 pulled another 100W, that still makes me feel reasonably comfortable that I'm only using about half of the 15A circuit's capacity at peak.