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PV installation - data from the inverter vs data from the meter

gawel111 46218 79
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Why do the PV inverter readings differ from the bidirectional meter readings, and is that normal?

Yes, that difference is normal: the inverter shows total PV production, while the meter’s 2.8.0 register shows only energy exported to the grid, and 1.8.0 shows energy taken from the grid/house consumption [#17051696][#17046754] Any PV energy used immediately in the house is not counted in 2.8.0, so inverter production can be much higher than exported energy [#17047628] One reply gives self-consumption as inverter production + 1.8 - 2.8 [#17051898] If you disconnect all loads, the inverter display and 2.8.0 should be similar; the meter arrow also indicates whether you are importing (+) or exporting (-) [#17047684]
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  • #61 18409221
    cuuube
    Level 29  
    Do you have parameters 1.7.0 and 2.7.0 on the meter?
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  • #62 18409403
    dario1965
    Level 10  
    Sory production of 6.4 MWh

    Added after 13 [minutes]:

    I don't have 1.7.0 and 2.7.0.

    As for the Goodwe 3kw inverter. I have remote view of the inverter production. The problem is that the production on the energy meter is 0.
  • #63 18409436
    Leon444
    Level 26  
    Leon444 wrote:
    It looks as if the meter would freeze six months ago and do not charge you anything for the electricity supplied to the network.

    dario1965 wrote:
    I hope this is a counter ... although it certainly did not jam because it is electronic and not mechanical.


    Seriously electronic? Well, it's not possible ;)
    Man, read it with understanding, I wrote that it crashed and not jammed, these are two different things.
    It was enough that when they read it, they accidentally changed the settings for a meter that does not have the option of giving back and then counts the energy sent as received or, as I wrote, it crashed with counting the energy returned.
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  • #64 18409443
    dario1965
    Level 10  
    Sory. They couldn't connect badly because they didn't move anything. For 1.5 years it was good, then nothing ..

    Added after 1 [minutes]:

    Can you do such things in the settings?
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  • #65 18409559
    3301
    Level 34  
    dario1965 wrote:
    Sory production of 6.4 MWh

    Added after 13 [minutes]:

    I don't have 1.7.0 and 2.7.0.

    As for the Goodwe 3kw inverter. I have remote view of the inverter production. The problem is that the production on the energy meter is 0.


    6.4Mwh at 2.5 R at 3kW is about 853kWh per year if it is noon is not enough, or maybe the last six months of the year the pv installation did not work, you write: "the energy meter is 0"
    on which meter? OSD or inverter?
  • #66 18409582
    dario1965
    Level 10  
    Inverter. On the OSD I have posted invoice extracts above.
  • #67 18409743
    cuuube
    Level 29  
    dario1965 wrote:
    I don't have 1.7.0 and 2.7.0.
    ok, but you have arrows on the meter, you can also check here (although you won't check exactly how much it is flowing, which way). Turn off all equipment in the house when production is on and see if the arrow changes direction to donate (to the left).
  • #68 18409758
    3301
    Level 34  
    Added after 2 [minutes]:

    dario1965 wrote:
    Inverter. On the OSD I have posted invoice extracts above.


    Check during the day if this install. is working, you have a display so you can preview the power, voltage, current
    since 0 on the inverter is and 0 is sent and it looks like it has not been working for half a year
  • #69 18591028
    theo33
    Level 27  
    First of all, a single or three-phase inverter?
  • #70 19680513
    mateuszpiotrowskipl
    Level 2  
    Hello

    I have had a PV plant for 8 days, during this time the PV has produced 183 kW. which is an average of about 23 kW per day. The problem is that before installing the new meter, I had an average consumption of max 15 kW. Currently, I have almost 11 kW downloaded on the meter, and 8 kW returned.

    How to count it 183 11-8 = 23.25 or since I have a new meter, I use an average of 8 kW more.

    The reasons were 15 kW was the maximum from the period when everyone was at home. Advertise the meter or what to do with it?

    Apator emu counter 3
  • #71 19680524
    rokbok
    Level 39  
    mateuszpiotrowskipl wrote:
    How to count it


    Production - Delivery = Self-Consumption, Self-Consumption + Collection = Actual Value of Energy Consumed.
  • #72 19680548
    mateuszpiotrowskipl
    Level 2  
    @rokbok have you read with understanding? I counted that since I have PV, I use 8kw more than before starting PV. Installation 7.8 kw. With the current maximum of 15 kw per day, for several months back.

    What difference does it matter if you count or like me above or like you, the result is the same

    183-8 = 175
    175 11 = real 186

    186 for 8 days is 23.25kw, and until I used 15kw max per day
  • #73 19680563
    rokbok
    Level 39  
    mateuszpiotrowskipl wrote:
    @rokbok have you read with understanding?


    You asked a question

    mateuszpiotrowskipl wrote:
    How to count it


    you got the answer what to understand here.

    rokbok wrote:
    Production - Delivery = Self-Consumption, Self-Consumption + Collection = Actual Value of Energy Consumed.


    But if you counted for yourself, you also answered yourself ;) .
  • #74 19680567
    mateuszpiotrowskipl
    Level 2  
    rokbok wrote:
    mateuszpiotrowskipl wrote:
    @rokbok have you read with understanding?


    You asked a question

    mateuszpiotrowskipl wrote:
    How to count it


    you got the answer what to understand here.

    rokbok wrote:
    Production - Delivery = Self-Consumption, Self-Consumption Collection = Actual Value of Energy Consumed.


    But if you counted for yourself, you also answered yourself ;) .


    Where is the question mark, I figured out how to count it, and I didn't ask, so not the reader understanding, the problem is not in the questions or statements, but in the numerator.
  • #75 19680590
    rokbok
    Level 39  
    Maybe you are right, my peace of mind, you are not the first to present such calculations and I am surprised, most of them forgot that since I have PV, I do not have to save so much, I do not write that you belong to them, but also if you think that the meter is wrong indicates report it, they will do an expert opinion, if it is ok, you will pay for it, if it falsifies the readings, they will replace the meter and you will be satisfied.
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  • #76 19680630
    mateuszpiotrowskipl
    Level 2  
    @rokbok I do not belong to such people, all summer long a jacuzzi that pulls 2kwh was used almost every day, air conditioning was on since August, 4 devices, now everything is turned off, and for 8 days I have 8kwh more consumption per day, so I guess something is wrong either I am stupid.
  • #77 19680661
    rokbok
    Level 39  
    Well, maybe the old meter worked for your benefit, I also have two air-conditioning systems + DHW heater and if during their operation, which was the norm in summer, my average consumption was at the level of 15 kWh / day, I would be very happy.

    Now in October, where the sun shines nicely, the air conditioning and the heater do not get electricity, my consumption is over 10 kWh / day, so these 15 kWh are somehow little for the devices that worked for you, so I am writing that maybe the old meter worked for you ;) .
  • #78 19681224
    RomanCitro
    Level 16  
    I deleted everything because the late hour caused me to think wrong.

    Assuming that the meters count well and the consumption has not increased, there may be losses between the inverter and the ZE meter.
    Apparently, when the ZE installation is bad (from the meter to, for example, a pole), there are apparently problems with proper operation.
    Here, for example, there is such a thread
  • #79 19688081
    dprzyb
    Level 22  
    RomanCitro wrote:
    A colleague of "Rokbok" thought well, but he was a little bit scattered
    he probably wanted to write: Production - delivery = total consumption. Total consumption - meter wear = auto-consumption.

    According to I think something has gone wrong for you and my colleague @rokbok wrote correctly: inverter production - energy returned to the grid = self-consumption, self-consumption + energy taken from the grid = real value of energy consumed
  • #80 19689294
    RomanCitro
    Level 16  
    dprzyb wrote:
    RomanCitro wrote:
    A colleague of "Rokbok" thought well, but he was a little bit scattered
    he probably wanted to write: Production - delivery = total consumption. Total consumption - meter wear = auto-consumption.

    According to I think something has gone wrong for you and my colleague @rokbok wrote correctly: inverter production - energy returned to the grid = self-consumption, self-consumption + energy taken from the grid = real value of energy consumed

    ehh. You are right, I distorted its correct content here :shocked!: :(
    as I read it now, I am surprised what I recorded in the correct wording "rokbok".
    I think it's late in the day. It's good that others are vigilant.
    I delete the unfortunate text
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Topic summary

✨ The discussion revolves around discrepancies between the energy production data from a photovoltaic (PV) inverter and the readings from a bidirectional meter. The original poster noted a significant difference in the energy produced (62 kWh) versus the energy exported (31.8 kWh) and total consumption (196.3 kWh). Participants clarified that the inverter's production includes energy consumed directly by the household, which is not reflected in the meter readings. They emphasized the importance of understanding how bidirectional meters work, particularly in relation to household consumption and energy export. Several users shared their experiences with similar issues, suggesting that differences in readings could stem from various factors, including meter calibration, inverter settings, and household energy consumption patterns. The conversation also touched on the need for accurate metering to assess energy efficiency and potential discrepancies in billing.
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FAQ

TL;DR: A 50 % self-consumption rate is “everything is correct” [Elektroda, 3301, post #17047684]; inverter totals usually read 1–5 % higher than revenue-grade meters [NREL, 2020]. Track 1.8.0 (imports) and 2.8.0 (exports) daily, subtract to catch errors.

Why it matters: Early comparison prevents six-month billing shocks and lost kilowatt-hours.

Quick Facts

• Inverter-to-meter deviation: typical 1–5 % [NREL, 2020] • Self-consumption example in thread: 50 % [Elektroda, 3301, post #17047684] • Add-on three-phase Orno meter cost: PLN 170 new, PLN 100–110 used [Elektroda, Jan_Werbinski, post #17052436] • Reactive energy (Q1–Q4) not billed until approx. 2026 [Elektroda, cuuube, post #18171654] • Phase-balancing test: 0.5 h, >⅓ load on one phase, watch 1.8.0 [Elektroda, 3301, post #18043981]

Why does my inverter show more kWh than the bidirectional meter exports?

The inverter counts every watt it produces, but the meter logs only what flows through it. Energy used instantly by appliances never reaches the meter, so exported 2.8.0 is lower. A 31 kWh gap on 62 kWh production matched 196 kWh household use in the thread [Elektroda, marcinbbb, post #17047628]

How do I calculate real household consumption?

Use: Consumption = Inverter production + 1.8.0 (imports) – 2.8.0 (exports) [Elektroda, Jan_Werbinski, post #17051898] This sums what was generated, adds grid energy taken, and removes what you sold back.

Is 50 % self-consumption considered good?

Yes. Grid operators and installers target 30–50 % for homes without batteries. The original poster reached 50 %, which was called “very good” [Elektroda, 3301, post #17047684]

What do meter codes 1.8.0 and 2.8.0 mean?

1.8.0 = total active energy imported from the grid; 2.8.0 = total active energy exported. Apator Smart EMU manuals confirm these designations [Apator Manual].

Does phase balancing affect my credits?

If your utility enables inter-phase balancing (PGE does), total three-phase power is settled, not each phase [Elektroda, kosmos99, post #18322484] Without balancing, one heavily loaded phase can draw while others export, raising 1.8.0.

How can I test whether balancing is active?

  1. Choose a sunny hour when PV is producing. 2. Connect a load >⅓ inverter power to one phase for 30 minutes. 3. If 1.8.0 barely rises, balancing works; if it jumps, balancing is off [Elektroda, 3301, post #18043981]

How accurate are inverter energy counters?

Field tests show inverters read 1–3 % high compared with Class 1 meters [NREL, 2020]. Forum users noted 9 kWh gaps on 400 kWh production (≈2.3 %) [Elektroda, RomanCitro, post #17248867]

What are Q1–Q4 reactive energy values on Smart EMU meters?

They log capacitive/inductive reactive energy in four quadrants. Current Polish tariffs ignore these values for residential prosumers until at least 2026, so they do not affect bills yet [Elektroda, cuuube, post #18171654]

Could wiring losses explain large differences?

Yes, high cable resistance or loose connections between inverter and utility point can waste energy as heat. Losses above 2 % on short runs suggest a fault [IEC 60364]. A user fixed a mis-wired pole connection that caused abnormal meter gaps [Elektroda, RomanCitro, post #19681224]

Can wrong country settings in the inverter lower exports?

Changing grid profiles mainly adjusts voltage and frequency trip points; it does not affect self-consumption share [Elektroda, 3301, post #18171586] Leave settings that match local grid standards to avoid shutdowns.

Why does my apparent consumption rise after PV installation?

Two reasons: 1) You use more appliances during daylight, assuming “free” power—forum users admitted this behavior [Elektroda, rokbok, post #19680661] 2) The previous meter may have under-registered load; the new smart meter is more accurate, revealing real demand.

When should I request a utility meter inspection?

Request if daily exports drop to zero despite sunny production, or if inverter and 2.8.0 diverge by >10 % for a week. Document readings and photos; utilities charge for successful tests only when the meter is accurate [Elektroda, 3301, post #18408521]

Daily checklist: How do I verify readings?

  1. Note inverter kWh at sunset.
  2. Record 1.8.0 and 2.8.0 on the utility meter.
  3. Next morning, compute self-consumption with the formula in Question 2. Three numbers should reconcile within 3 %.
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