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Payback on retrofit battery system


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Is there a way to calculate the payback time of a project when installing a retrofit battery?
(So there is already a PV-system in place, but the customer wants to add a battery.)

The payback should be based upon the increased lvl self-consumption and the cost of the battery expansion.

Best regards,



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HI Sander,

yes, I guess that would be possible. If you can isolate the cost of the battery system and the financial benefit due to the higher level of self-consumption (savings on the from-grid tariff), you can enter just that. Another way would be to enter all financial data for the system as it is now, simulate and save. And the add the battery system, add the extra cost, simulate and save as another file, and then compare the two files with the project comparison.

Hope that helps, kind regards,


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