[This discussion was separated from the “ Can I hang 4X emonTx via wire on one emonPi/Base? ” thread to help keep both intertwined discussions on topic - mod] One setup monitoring 8X single-phase, two-leg circuits (US wiring) requiring 16 CTs. Another setup monitoring 3X circuits and connected to 6 …

And the unfortunate reality is: The emonTx/emonPi has only one voltage input, The US a.c. adapter is a 120 V beast.

[image] Can I hang 4X emonTx via wire on one emonPi/Base? [image] Can I hang 4X emonTx via wire on one emonPi/Base? If you want to exactly mimic your revenue meter for the measurement of a pure 240V load [ctconfiguration] Yup, as shown, having only CT1 on the circuit will miss this load…

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Yup, as shown, having only CT1 on the circuit will miss this load, while the meter, monitoring both sides, will catch it. You’d need CT2 in order to get a complete reading. And while circuits will be staggered so that they roughly balance …

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Where I think there is some debate is when considering the inaccuracy when measuring a 240 V appliance that has a 3-wire connection. The assumption that means only one c.t. is needed is that the neutral wire carries an insignificant curren…

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Well, the answer is simple IMO; buy one CT and stick it on the neutral wire first. If you see more than that insignificant usage, well, you’ll need to pick up a 2nd one! :slight_smile: Hmmm. After thinking about that, the conclusion I c…

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Given the utility’s meter doesn’t use the neutral leg, how could any imbalance affect the bill? Here’s a thought experiment to prove it: Install your own, perfect, lossless transformer between the supply company’s transformer and your …

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Given the utility’s meter doesn’t use the neutral leg, how could any imbalance affect the bill? Because the utility does monitor both legs and add together. The current on the neutral leg comes from one of the two hot legs and the usag…

[image] Can I hang 4X emonTx via wire on one emonPi/Base? Because the utility does monitor both legs and add together. The current entering one leg of the 240 Volt secondary winding of the transformer is the same current leaving the other leg of the transfomer. (minus any difference in the ne…

[image] Can I hang 4X emonTx via wire on one emonPi/Base? [image] Can I hang 4X emonTx via wire on one emonPi/Base? Given the utility’s meter doesn’t use the neutral leg, how could any imbalance affect the bill? Here’s a thought experiment to prove it: Here’s another thought experiment f…

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