the same way there's a scale text box to make a "virtual" solar array as a multiple or fraction of an actual system on the Power I/O chart could there be the similar set of Scale text boxes on this visualisation:

https://data.solarnetwork.net/dev/charts/power-area/power-area-overlap.html?nodeId=120&consumptionNodeId=120&consumptionSourceIds=House,HotWater&sourceIds=Solar

so that we can alter the size of the solar in particular to simulate a system against an Audit customer's consumption.