# CO2

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Hi,

Short question regarding the value in the software for CO2 savings,

What it the value based upon?

Best regards

Daniel

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Hi Daniel,

this value refers to the current energy mix in the country where you design your PV system. In Germany, for example, we have an energy mix that produced ~ 530 g CO2 per kWh in 2016. This value is used to calculate the CO2 emissions that were avoided thanks to your PV system.

Kind regards,

Martin

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So in my case that will mean that the value refers to the current energy min in Sweden.

Where is this value collected? Where do you get the input from?

Best Regards,

Daniel

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Hi again,

yes, you would have to find out the specific co2 emission for Sweden, as up-to-date as possible. Perhaps the Swedish energy ministry publishes such data? On Wikipedia I found that in 2013 the electricity consumption was 133.2 TWh, while the CO2 emissions were 37.5 Mt. This would equal to 282 g/kWh, but perhaps you'll find more recent information.

Kind regards,

Martin

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• 4 years later...

Hello everyone,

I will hijack this thread as to avoid creating a new one.

Based on the CO2kWh from the simResults, how do you calculate the actual CO2 emissions avoided that is shown in the report?

I have tried multiplying it with several kWh/Year fields, starting with Own Consumption, but I am unable to arrive at the value in the report.

What is the formula here?

CO2kWh * ?

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Hi obrvaner,

Yeah, the calculation is just as simple as g/kWh and you have to input that yourself based on your region and and LCA for the system.

You can change it here:

And I just want to add, in regards to what Martin said above about how dirty our electricity in Sweden is that the calculation is wrong because those are our total energy emissions calculated on electricity production. And electricity only stands for about 9% of our emissions. We're about 30g/kWh, second cleanest electricity in Europe I believe.

Which, coupled with the most reliable LCA I've read (assuming that the panels are made in China) doesn't really guarantee that solar in Sweden is a net positive for the climate.

I don't tell my costumers this as they're not really after the environmental benefits but rather the economical and if they want to feel like they're doing the climate a great service at the same time I'm not going to burst their bubble.

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Hello Jimmy,

My question is which value(s) need to be multiplied with 470 (or whichever value is set for CO2 saving) to get the highlighted result bellow.

To clear things up, I am using the simResults.xml to generate the same report and can not figure out the formula.

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I think it should be the "PV Generator Energy (AC Grid)" with a slight rounding error, at least that's what I get.

But if you're using 470g/kWh I can't make sense of your numbers.

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• 1 year later...

From what I know, the

On 4/1/2022 at 10:49 PM, obrvaner said:

Hello everyone,

I will hijack this thread as to avoid creating a new one.

Based on the CO2kWh from the simResults, how do you calculate the actual CO2 emissions avoided that is shown in the report?

I have tried multiplying it with several kWh/Year fields, starting with Own Consumption, but I am unable to arrive at the value in the report.

What is the formula here?

CO2kWh * ?

From what I know, the formula is this:

CO2 emissions avoided = [PV Generator Energy (AC Grid) – Standby Consumption (Inverters)] x Specific CO2 savings through the use of PV energy

The used values for the “Specific CO2 savings through the use of PV energy” can be found under “Options” > Project Options” > “AC Mains”. Of course, the value is more valid for Germany, as it represents the German electricity mix. It comes from the Federal Environment Agency (Umweltbundesamt). If necessary, you would have to enter a value there that would be valid for Denmark. But we unfortunately do not know these values.

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On 12/20/2017 at 1:34 PM, developer_mh said:

Hi again,

yes, you would have to find out the specific co2 emission for Sweden, as up-to-date as possible. Perhaps the Swedish energy ministry publishes such data? On Wikipedia I found that in 2013 the electricity consumption was 133.2 TWh, while the CO2 emissions were 37.5 Mt. This would equal to 282 g/kWh, but perhaps you'll find more recent information.

Kind regards,

Martin

How do you go from the 37,5Mt to 282 g/kWh?

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Dear all,

I'd like to share an interesting website I found recently where you can look up the specific CO2 emissions per country on a map:

40 minutes ago, Sofie said:

How do you go from the 37,5Mt to 282 g/kWh?

This was really a very rough estimate, by just diving the CO2 emissions by the electricity consumption, 37.5 Mt / 133.2 TWh = 282 g/kWh. This calculus does take into account a whole bunch of factors and actually we should forget that I even did that calculation We should look it up on the above website instead.

Kind regards,

Martin

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Hej

for more information on carbon footprints per kWh there is the app Electricity Maps. https://app.electricitymaps.com/map

It looks like this and you could get aggregated data for several historical years.

Kind regards
Frederik

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