I love the plug and play installation of this system.
If we have consecutive days of cloudy weather, the idle consumption of the inverter adds up over the course of a week, draining the power reserve for basic house functions, so having expansion batteries is really helpful.
I live in a pretty cloudy part of the country so having a two expansion batteries per Apollo 5K gets me through a week of cloudy weather.
Next, I’m working on expanding the size of my solar panel array, to enable quicker recharging of the system