Shelly Negative energy value

[austere bramble]

Shelly Shelly Plus 2PM (SNSW-102P16EU) is reporting negative energy value. How to fix it?

[silver hill]

yeah i had this a while back, they added an option to the webui to invert it.

click on the channel

then in its settings section

can invert the measurements so it reports correctly

if you cant see then you may have to update firmware but its been in for a while now so may already be there on new devices

[austere bramble]

just did that and hopefully it fixes that

it has inverted power too

[silver hill]

yeah it will invert both.

its odd that they would be different polarities though

are you sure the device is wired correctly?

[austere bramble]

yes it is wired correctly

[silver hill]

you could make a helper that take the absolute value of whichever one is negative i guess

[sonic oasis]

This doesn't look wrong on the first one

The unavailable thing might have caused a negative jump or it actually was negative for a while. Make sure the right energy sensor is selected

If you were needed to sum absolute stuff it's usually installed wrong

[austere bramble]

this is how it was wired

how should I change it so that this issue is fixed at hardware level?

[austere bramble]

it was wired this way

[silver hill]

it looks right to me. what is plugged into them?

[austere bramble]

phone charger, laptop chargers

[silver hill]

is there anything with a c7/c8 power plug on it? (figure eight)

those can be plugged in either way, therefore changing the live/neutral orientation. the device doesn't care but the power monitor may

[austere bramble]

my printer does have that cable

and I sometime do plug that in

[silver hill]

its possible that could confuse it but i am reaching a bit here

[sonic oasis]

If this is continuous then maybe switch the wires could fix it

Or you create a helper sensor which always abs() the value

Tho I haven't seen that one yet tbh

[green notch]

No, as the Shelly has no reference to anything other then L and N it can not tell the difference.

[silver hill]

i meant the c7/c8 connector

either way i dnt think its the issue, was just a random reach