My colleague @Bill.Thomson pointed me towards your other page for this https://circuitsetup.us/index.php/product/expandable-6-channel-esp32-energy-meter/ (as I can’t get my brain around Github).
I noticed a couple of points of concern:
As Dan intimates that you’re using an energy measuring I.C., that looks very much like the accuracy of that. To it, you must add the (in)accuracy of the c.t. and the v.t. to get a meaningful value for what the user can expect. In particular, the SCT-013-000 has it’s linearity specified from 10% to 120% of rated current, outside that range no accuracy is specified at all, and there’s absolutely no value given for the phase error. And increasing phase error as the operating current falls is inherent in any c.t. And for some of the other c.t’s on your list, all I can see is a blanket unqualified single number as an accuracy claim. That is highly suspicious, and I’d take that to be a spot value only at the rated current.
And I can’t see any accuracy given for your v.t. - again highly suspicious. The reality is an a.c. adapter is designed down to a price as an isolated low voltage power supply, it is not a measurement transducer.
Again, that figure can only be for the energy measuring I.C. itself. You will find that pickup and crosstalk, both on your pcb and in the external wiring, and digital noise on the supply will all, to varying extents, degrade that number.
My feeling is that to avoid claims of false advertising, you might want to make it clear that both those only apply to the energy meter itself, as both are likely to be degraded in a practical application.
One further point you might want to look at in the future: you’ve made it very expensive - if I’ve read your data correctly - for European users where 3-phase is widely used for domestic supplies as well as industrial (whereas in the UK, the normal supply for domestic and light commercial premises is single phase), as they appear to need an expansion board to measure all three voltages.