Changeover Box for SMA Sunny Boy Storage + 1-Phase PV Inverter – enwitec

Backup power for your SMA system – enwitec changeover box for Sunny Boy Storage + single-phase PV inverters

With the right changeover device, the SMA Sunny Boy Storage system becomes a genuine backup power system. The three-phase enwitec changeover box is the solution officially listed by SMA in its planning guide: in the event of a power cut, it safely disconnects the PV system and consumer distribution board from the public grid and keeps supplying your home from battery and sun.

Phase coupling integrated

The built-in phase coupling means that, in backup mode, the single-phase battery inverter supplies all three phases of your home – with a maximum thermal throughput of 20 kW.

For Sunny Boy Storage and single-phase PV inverters

Designed for an SMA Sunny Boy Storage 3.7/5.0/6.0 in combination with single-phase SMA PV inverters (e.g. Sunny Boy 3.0–5.0). Optionally, the SMA Energy Meter EM-20 or Sunny Home Manager 2.0 can be integrated directly into the box.

Ready to connect instead of a DIY build

Pre-assembled, pre-tested, automatic changeover: installers no longer need to build the changeover device themselves at great cost and effort, nor take on the warranty for it.

Frequently asked questions about the SMA changeover box

Which earthing systems is the box suitable for?

At the grid connection point for TN-S, TN-C and TT; in the consumer installation for TN-S and TT. Country approval: Germany and Switzerland.

Can the Sunny Home Manager be installed?

Yes, the SMA EM-20 and SHM 2.0 can optionally be integrated.

Who installs the changeover box?

Installation is carried out by a qualified electrician in accordance with the enwitec installation instructions; acceptance must be clarified with the grid operator.