Jump to content

why first year saving is different


Recommended Posts

Hi anees,

most probably the difference comes from the module degradation that is already accounted for in the first year. Might also be due to some economic parameters such as interest rates, but this I would have to check. If you can provide a project file that would be helpful.

Kind regards,


Link to comment
Share on other sites

Hi anees,

thanks for the project file. Please send it as a private message in the future so that personal data is not made available to the public.

The numbers in the project file differ a bit from the numbers of your screenshot. But from going through your project file I can suggest the following in order to make the numbers reproducible by hand:

  • Set the start date of operation to the first day of a month, eg. June 01, 2023
    • This is because the years of the economic calculation start in the month of the date that you enter as start of operation.
  • Module degradation to 0% (already done in your project)
  • Set the inflation rate for the energy price to 0%
  • Set the Interest on Capital to 0%
  • Then you can calculate the resulting first year saving by hand:
    • (direct own use - standby consumption of inverters) * 0.4 €/kWh
    • You have to subtract the standby consumption of the inverters because this is energy you have to pay for after you operate the PV system

Hope that helps, kind regards,


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...