Split phase current monitoring over 66A #104
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kylehendricks
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I'm a little confused about this Answer in the FAQ:
I'm using two ECS24200 CT clamps to monitor my two main legs. When I'm charging my car (48A@240V), running the dryer (20A@240V), and running the AC (10A@240V), each leg can easily go over 66A. I did some other reading it seems like the solution is to cut my calibration value in half and double my power readings in software. After reading this answer, I'm questioning whether I'm missing something here.
Calibration for each CT is 14000-15000 with a 4X PGA gain.
Edit:
I came across the following comment here:
I took a peek at the datasheet for the ATM90E32 and see that it can only output up to 65A (16bit). It appears that my best option is to divide my
gain_ct
by 4 and multiple my power and energy by 4. Do I have this right?Edit2:
I tried dividing
gain_ct
by 4 and multiplying power/energy by 4 and that worked at lower currents but once it gets over 40-50 amps, it starts getting way off (Fluke clamp meter showed 90A, esphome was reporting 50A). I also see on the SCT-024 page it says:Do I have any option to monitor higher currents? Would switching to using the SCT-013 help?
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