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olehs / PZEM004T

Arduino communication library for Peacefair PZEM-004T Energy monitor
MIT License
225 stars 114 forks source link

Bidirectional Current #63

Closed thiagoarreguy closed 3 years ago

thiagoarreguy commented 4 years ago

Its possible to read a current and know the way flows?

For example, to monitoring a solar photovoltaic system that send current to the grid.

I have found the device on aliexpress and i wish to one with same functions:

https://www.aliexpress.com/item/10000025557485.html

I know that 6 in 1 meter have an arrow on CT to measure the current on correct way: https://a.aliexpress.com/_dWFRgEX

Bu i dont know if this CT will work with pzem-004t.

Thanks in advanced.

thiagoarreguy commented 4 years ago

pzem-004t allow negative power value? if the current is negative...

vortigont commented 4 years ago

@thiagoarreguy, it is not possible out of the box, Although I remember it was mentioned that PZEM controller chip has a dedicated pin that represents the direction of the current flow, but it is nither traced nor processed in software. The coil itself doesn't matter. I believe it would be much simpler to install a dedicated coil and meter to the solar inverter itself and measure the output power there.

thiagoarreguy commented 4 years ago

I already did:

http://thiagoarreguy.servehttp.com/arquivos/proxy.php?page=energia

http://thiagoarreguy.servehttp.com/arquivos/graficopotencia.php?date=today

But i would like to know the amount of energy injected on the grid (during daylight) and energy consumption (during night).

vortigont commented 4 years ago

PZEM has only one omnidirectional cumulative counter, it doesn't segregate IN and OUT energy into two counters. 1kWh IN and 1kWh OUT would result in 2 kWh absolute energy. Even if you do HW mod and read pin status you would have to do the SUM math your self. Better to look for other powermeters out there with required features.

thiagoarreguy commented 4 years ago

This 6 in 1 energy meter measure the current only in one way: https://a.aliexpress.com/_dWFRgEX

I wish have a pzem-004t with the same function =)

vortigont commented 4 years ago

Why do you think so? I have one of these, it is the same as PZEM - doesn't matter with which wire you feed it Live or Neutral it always increments.

thiagoarreguy commented 4 years ago

Not this model, is not from peacefear. And have an arrow on CT to measure the current on correct way.