Looks like the efficiency ranking of systems is calculated by dividing the average daily output by the system size. There is a potential problem with this: If a secondary system is added/removed, then the calculation is based on the new size while the average daily output slowly rises/lowers as the output increases/decreases. One way to get around this issue regardless of adding or deleting secondary systems or adding/removing panels would be to calculate the efficiency ranking by averaging the daily efficiencies as the daily efficiency can already be calculated by dividing the daily output by the **editable** system size. Alternatively, the monthly or yearly efficiencies could be averaged. I do not know all the math involved in creating this but I suspect it would be more complicated. Perhaps this could be a user calculation by enabling export of the daily efficiencies as an excel column and the averaging calculation be applied. The user then can enter this result as a user calculated efficiency and ranking based on this.

# Efficiency Ranking

**gregvet**#1

**Pedro14**#2

I use “efficiency” figure to show “Time Producing”.

Comparing “efficiency” of a 6.84kw system with a 5kw inverter , against a 5kw sytem with a 5kw inverter skews the picture

Efficency ladder correction

**wattmatters**#3

It’s confusing to use the term *efficiency* for anything other than a ratio of (energy out) / (energy in).