There is no one-size-fits-all solution to energy storage. The building blocks, topology and control systems will depend on local preferences and regulations. The MultiPlus-II hardware, together with a wide range of software tools, seamlessly fits in all common topologies, shown in the pictures below.
The MultiPlus-II
Will temporarily store excess solar power in the battery.
Can be configured to operate with a PV array and a MPPT solar charge controller, or with a PV array and a PV inverter.
Can control the power flow to and from the grid. When connected in series with the incoming power line, the internal power meter can be used. Several wired and wireless external power meter solutions are available for other configurations.