Hello @HenryH, thanks for pointing this out I will get this added. The K-L should be oriented for solar feeds into your panel with the L facing the panel and the K facing the solar source/inverter.
Please note below.
The 50 amp sensors are directional, however currently the firmware does not support that functionality, we compensate for this in the app by having a flag of solar/generation, which shows all energy flow, regardless of direction as production. We do plan on updating the firmware in the future to allow the 50 amp sensor to recognize energy flow in both directions.