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Battery System Upgrade on Existing Solar
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Add the existing panels and inverter to the system design, just as you would for quoting new ones.
Then on the Solar and Battery designer page, click the 'pre-existing' box next to each inverter and MPPT. That way their energy production is factored into the site and battery charge, but they are not added to the quote.
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The consumption profile on the Energy page needs to be “before solar”, i.e., the customer’s actual consumption - not the nett energy imported from the grid (ie reduced consumption due to existing solar).
The solar export earnings from the existing system do not contribute towards the payback/ROI of the battery
The payback periods for battery only upgrades on existing solar are usually quite long.
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