why first year saving is different

[anees]

i think 3502*0.4= first year saving

[developer_mh]

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,

Martin

[anees]

@developer_mh here it is

 

Edited June 19, 2023 by developer_mh
attachment removed for privacy reasons

[developer_mh]

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,

Martin