These round identification stickers help electricians, maintenance staff, and emergency responders quickly recognise solar-related components such as inverters, isolators, switchboards, and battery systems.
For most home and portable PV systems, you will only need one inverter if you are using either a string inverter or power optimizers for the solar array; if you use micro-inverters, you won't require a standalone inverter all as they convert DC to AC at the panel.