New solaredge inverter

[aloutsios]

Hello I have a new solaredge inverter ( without screen ) 4 kw single phase . for a simple solar system with 13 panel's and a new solaredge inverter without battery storage only from the panel's to inverter and from the inverter to electric grid , how accurate is the measurement of inverter ? I mean normally if the inverter showing of the end of the day 30 kwh, the same result must showing to the electric grid meter? or there is any percentage lost of the inverter to the electric grid meter ? If the inverter and grid meter is into one meter area is possible to showing diferent result the solaredge monitoring aplication and the electric grid meter ?


Thanks a lot

[ButchDeal]

Hello I have a new solaredge inverter ( without screen ) 4 kw single phase . for a simple solar system with 13 panel's and a new solaredge inverter without battery storage only from the panel's to inverter and from the inverter to electric grid , how accurate is the measurement of inverter ?

Pretty darn accurate

I mean normally if the inverter showing of the end of the day 30 kwh, the same result must showing to the electric grid meter?

No. You consume some of the power in the house

or there is any percentage lost of the inverter to the electric grid meter ? If the inverter and grid meter is into one meter area is possible to showing diferent result the solaredge monitoring aplication and the electric grid meter ?


Thanks a lot

Yes it is called self consumption. You see you have the inverter measuring what you generate putting it into your house, your loads are there as well, then there is the grid meter which measures NET showing what you consume from the grid and put back to the grid. But what you put back to the grid is NOT the same as what you generate because you consumed some of it.

[aloutsios]

The electricity grid meter has two meters the one meter measuring what generate my solar system and send it direcktly to the electric grid and the other meter showing what my house consume from the electric grid and take it direcktly from the electric grid (in and out meter) . My inverter records the output of the system which is sent it directly to the electeic grid .
so the one meter mesure the house consumption and the other meter the system generation . the electric meter does not remove the consumption of the house from the production. It simply showing the generate of the system and the consumption of the house and the electricity supplier makes the bill. The problem is that the solaredge inverter showing that has more generate from the electric grid meter . for the one day the solaredge inverter showing generate 26kwh and the electric meter showing that load to the electeic grid only 23kwh and my house consumption is18kwh thats means i lost 3kwh every day. generate results from the inverter 26kwh and the consuption of my house 18kwh 26-18 = +8kwh if the electric grid meter showing generate result 23kwh and consuption of my house 18kwh thats means 23-18= +5kwh so i lost 3 kwh every day . who is the correct result the inverter or the grid meter ?

[ButchDeal]

ok first lets be sure we are talking the same thing here. does your inverter connect to a breaker in your MSP? where are you located?
you say you have two meters one showing generation, is that for SRECs?
You mention the other meter shows both in and out, that sounds like a net meter..

The first meter should match your inverter pretty closely if it is a generation meter.

[J.P.M.]

If part of your question is how do meters compare when reading the same thing, the meters will show different absolute values, mostly due to consumption that one meter accounts for and the other one does not. Measuring the same amount of energy going through them the meters will read/record slightly different values.

FWIW, my array's monitoring records array generation that is about 0.5 % or so higher than the POCO meter and my measurements would have me believe. That is, it's overestimating/reporting generation.

A lot of monitoring devices that can be purchased w/solar products will claim accuracy to maybe +/- 5.0 % or better. To my somewhat limited experience, they usually meet or exceed that claim.

After market meters or metering required for SREC arrangements are usually/commonly/often required to be +/- 0.5% or better in terms of accuracy.

[aloutsios]

Hello again
Lets take one by one from the bigin .
Please see the picture is amesurement for 9 days inverter and electric grid
On 04/07/2019 The Electric Grid meter was on 50.5KWh
The inverter from the 05/07/19 to 13/07/19 give me generetion of 223,43 KWh + 50,5 KWh from the day before on grid meter , total 273.93 KWh
On 13/07/2019 the Electric Grid meter showing generation of 248,5 KWh, 25,43 KWh less that the generation of inverter .
Thats mean 25,43 KWh (2,825KWh per day ) missing , this is the problem
(Please see he picture of electric grit meter -consumption - generation )
thanks

[aloutsios]

inverter generation