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The payback period is 25+ years, help!

There are a few things that can help with the payback period. If you navigate to the financial task and scroll to the Generation and Consumption section, you can edit the electricity costs for your customer. You can also specify the export tariff in this section for excess energy that is sold to the grid.

Another tip is that if you click into the Electricity cost field there is an option to change the rate at which the electricity will increase each year.

Adding a couple of batteries to the system might also be beneficial. This will increase the initial investment required but will allow the customer to store energy produced from peak times in the day to be used later.