Solar energy not used during the day

[Unleveled9124 (Chris)]

In short: I still consume energy from the grid while my solar panels are producing energy. I was wondering if I misinterpreted the data from the DSMR smart meter, or that the smart meter/solar panels are malfunctioning.

I was looking at other forums and at the documentation, but I could not find somebody with the same question as I have. If I missed a similar post, I am sorry and please post that post down below. Any help is welcome.

More details:
Last month they installed solar panels on my roof. They work with the Enphase envoy integration in home assistant. I have been comparing the data I track from the DSMR smart meter integration with the Enphase envoy integration. It seems that I sometimes use my solar energy and sometimes I do not. As can been seen in de graph below. The Blue Line represents the energy production according to the smart meter (DSMR Smart Meter integration), the red line indicates the energy production according to the Enphase integration and the yellow line indicates the energy consumption according to the smart meter.

The Blue Line shows dips which corresponds to the moments that I turn on my dishwasher and washing machine. Thus this leaves me to believe that the blue line indicates the amount of energy that I feed back into the grid. As the moments that I turn on my dishwasher are not shown as spikes in the yellow line, this leaves me to believe that the yellow line indicates the energy that I consume from the grid. I was wondering why this yellow line is not 0 during the day. I still have solar energy left, so I should not be consuming energy from the grid, right?

Is there something in my reasoning which is incorrect? Are the variables not what I assume them to be? Is the smart meter malfunctioning? Or is it another problem entirely?

Any help would be great!

Technical specification:

I track the energy consumption and production by a usb to P1 - cable directly plugged in from my smart meter to my home assistant green.

I have a Home assistant green which is currently running on 2025.3.1

The Smart meter is a Kamstrup 382JxC

[catsmanac (Arie Catsman)]

If the smart meter is a balancing type as is standard in many EU countries, it would be either the Blue line or the Yellow line that is positive. In you graph there’s smart meter production and consumption at the same time.

That can be the case if it is not a balancing meter, a multi phase installation and solar is exported on one phase while consumption is happening on another phase.

Does your Enphase Envoy have current transformers or is it a simple standard verion?

This is my Dutch smart meter, as you can see it’s verbruik or Productie, but not both at the same time.

[freeeky]

Hi,

I have (based in NL) the same symptoms. My smart meter is a 3-phase meter. My data also shows consumption on one phase while the phase that my inverter is connected to reports production.
I asked my energy company and Enexis how that is registered with regards to production fees which are now very common in NL. Enexis told met the meter internally balances production vs. consumption. So, when Enexis reports the electricity data to the energy company, this is always the net usage. That implies the P1 port reports data before the meter balances the data.
I think is also may have to do with the frequency the data is provided to the energy company. To my knowledge this is done every 15 minutes, while the P1 reports every second.

[Unleveled9124 (Chris)]

Thanks for your replies.

It is good to know that I interpreted the data correctly.

I contacted the solar company and indeed the solar panels were only installed on 1-phase.

It is good to know that other people have the same symptoms and that I am not alone

I will look into the consumption rates at the energy supplier and keep in mind the delay in the smart meter.

Thanks again for the help

[chielmi]

Not to hijack the topic, but I have a similar issue as the TS.

As you state, it doesn’t make sense to have both Verbruik (sensor.electricity_meter_energieverbruik) and Levering (sensor.electricity_meter_energieproductie) at the same time. But this is exactly the issue I have in HA since March 18:

Before March 18 my Verbruik was showing zero for moments when my solar panels were producing more than my consumption, but since March 18 HA shows both at the same time.

I can’t figure out what happened. I don’t think it is an issue with my P1 meter as the total reported values in HA and in the dashboard of Vattenfall are correct…

[catsmanac (Arie Catsman)]

Obvious question: anything that changed/updated on or right before Mar 18?

The curve you are sharing is pretty smooth, is that the actual raw data from the meter?

[chielmi]

That’s caused by 1 hour intervals, if I set it to 5 minutes the view is like below for today. I consumed 100% of the solar power today as I charged my EV on low power (5A). In the afternoon (when the sun really started to shine) you see there’s a constant consumption of > 3.000 W but still I’m delivering back 1.000 W at the same time.

It must be a HA error but I’m puzzled that nobody else reports this. Nothing changed in my environment, but I think I installed an update of HA at that date.

Interestingly the data in the energy dashboard is correct. The consumption/delivery is exactly the same as reported by the energy company. It is just the “live” values for Energie Verbruik and Energie Levering that are incorrect.

This screenshot probably is most clear

The first and second chart make perfect sense. Solar production is on phase L3, so in the consumption (when charging my EV) most power is drawn from the net on phases L1 and L2.
The chart on the right showing the total values is showing my issue. Until March 18 the Levering should show as zero (as no power is delivered back to the net), but the chart now suggests that power is returned to the net.

[catsmanac (Arie Catsman)]

The Energie Levering and Energie verbuik are data from where? From the DSMR integration?

Are the charts you show, the standard history charts one can also see in the entity properties, or some custom or core history chart that may have changed with a release?

[chielmi]

From DSMR indeed: sensor.electricity_meter_energieproductie and sensor.electricity_meter_energieverbruik.

If I check the sensor.electricity_meter_energieverbruik history, March 18 was the last day where the consumption at daytime was indeed zero during times my solar panels were producing more electracity than I consumed

None of the sensor or chart data is customized. I mainly use HA to monitor my energy situation, using standard data right from the sensors…

[chielmi]

I applied a workaround for now. I created a Helper script in HA with the following content:

{% set l1_consumption = states('sensor.electricity_meter_energieverbruik_fase_l1') | float(0) %}
{% set l2_consumption = states('sensor.electricity_meter_energieverbruik_fase_l2') | float(0) %}
{% set l3_consumption = states('sensor.electricity_meter_energieverbruik_fase_l3') | float(0) %}
{% set l1_production = states('sensor.electricity_meter_energieproductie_fase_l1') | float(0) %}
{% set l2_production = states('sensor.electricity_meter_energieproductie_fase_l2') | float(0) %}
{% set l3_production = states('sensor.electricity_meter_energieproductie_fase_l3') | float(0) %}
{{ (l1_consumption + l2_consumption + l3_consumption) - (l1_production + l2_production + l3_production) }}

This now shows the right values in my graphs. Maybe somebody once stumbles upon my post and finds it useful