Enwitec switching device for SMA Sunny Boy Storage 3.7, 5.0 and 6.0 with production meter connection

In the event of a power failure, a standby power system safely disconnects the connected PV system including remaining customer system from the public power grid and simultaneously provides the customer with a 1-phase standby power supply. For 10 kWp systems, a production meter is required by the power supply company. This can be connected directly to the corresponding terminals of the box. 

Due to the new “Battery backup distribution” system from enwitec, which is ready for connection and pre-tested, installers no longer have to build the switching device themselves, which is time-consuming and cost-intensive, and no longer have to assume their own warranty. So far, enwitec’s “Switching device for standby power/battery backup distribution” (in short, “BBD”) is the only product recommended in the SMA planning guide for use in the “Flexible storage system”. The “BBD” for the SMA “Flexible storage system” uses only components approved by SMA, thus forming the basis for maximum reliability of supply.

The standard versions with a throughput power of 20KW allow the feeding of three SMA Sunny Boy Storage battery inverters, whereby the grid separation is always 3-phase and all-pole.

Recommendations for use in various systems:

Please refer to the official SMA compatibility list in this regard. 

Design factor:

A design factor for standby power operation must be observed to ensure that the PV system continues to work in standby power operation. In this case, the maximum PV AC nominal power may be 1.3 times higher than the nominal power of the SMA Sunny Box Storage. 

SMA SB Storage 3.7     = max. 4.8 kW 1-phase SMA inverter

SMA SB Storage 5.0     = max. 6.5 kW 1-phase SMA inverter

SMA SB Storage 6.0     = max. 7.8 kW 1-phase SMA inverter

For larger systems, the additional inverters are then designed as 3-phase inverters!

Specifications:

• Inverter battery: SMA SBS 3.7 to 6.0
• PV inverter: 2 x SMA SB 1.5 up to 5.0, 1 x SMA STP 3.0 – 10.0 (not active in standby power mode)
• Integrated SMA backup controller
• Preparation for SMA Energy Meter or Home Manager 2.0
• Connecting terminals for production meter
• Phase coupling in standby power operation for all 3 phases