I have 42 circuits, most CTs are Micro-40s but 4x Micro-80s on larger loads. The mains are SPLIT-200As. Filled up 32 channels with 9 channels grouped up on the GEM.
In Grafana I've summed up the mains, subtracted the sum of the other CTs and that results in the following. I've double checked these values on the Dashbox and also again by my own queries on the Dashbox hourly data as well. Look over time, it never varies much off 100W except once in a while down to about 40-50W. I've tried correlating that with other loads and couldn't find anything that had a relationship to current draw.
From my own Influx data. Top is the missing load, bottom is just the consumption by channel much like the Dashbox shows:
From the Dashbox SQL database directly (in kWh). Matches up being around 100W per hour, so 0.1 kWh:
So overall I've tried to check everything I can think of:
- Ensuring all CT connections are solid on the GEM, manually testing each load
- That all grouped loads are set correctly in terms of polarity on the CTs (both for 240V balanced loads measured by one CT and also 240V unbalanced loads or other logically grouped loads e.g. two light circuits). Manually tested each as well to ensure no canceling out occurred.
- Channels are set to double properly for balanced 240V loads
- Trying to account for GFCI and AFCI/GFCI power consumption, which seems to be for my Eaton CH breakers between 0.75W and 1.3W per breaker. I have 28 non-dumb breakers, even at 1.3W each (the maximum for any of my breakers, the CHFAFGF115PN) that is only 42W. If it was just this accounting for the 100W, that'd be 3.5W per breaker. That doesn't seem right.
- I also shut off every breaker except the one powering the GEM/DB, and it resulted in 11W being consumed on both the mains and that single CT. Turning on two AFCI/GFCI combos resulted in an increase on the mains of around 3W... which makes sense if ~1.3W x 2 per Eaton is the power consumption of the breakers. I stopped there because all the rest of the circuits have _something_ on them, wanted to test with zero load.
- Shutting off all breakers (except that one) resulted in all channels showing 0W, so I guess I'm not getting any noise that seemingly requires the jumper
11x AFCI/GFCI @ 1.3W = 14.3W
16x AFCI @ 0.75W = 12W
6x GFCIs 3W (unknown, assuming 3W on the high end. One breaker, rest outdoors/garage/mechanical in-wall) = 18W
= 44.3W
So 100W - 44.3 = 55.7W still unaccounted for.
This happens even with total house load at say, <1kW. The Micro-40s per the latest threads I could find are damn accurate it seems at 1% or so, so that'd only be <=10W difference (I forgot if that is under/overshoot). Either way the math doesn't add up.
So maybe I'm just obsessing, but 55.7W is still nothing to sneeze at 24/7.
My next steps I think are to calibrate off a known load, and go from there. Thoughts?