4 Product Description
SMA Solar Technology AG
18
STP5-9TL-IA-en-10
Installation Manual
4.3 Electronic Solar Switch (ESS)
The ESS and the DC connectors form a DC load disconnect unit. A
Bluetooth
antenna, integrated into
the ESS, increases the radio range.
Figure 5: Design of the ESS
When plugged in, the ESS forms a conductive path between the PV array and the inverter.
Removing the ESS will interrupt the DC electric circuit and removing all DC connectors will disconnect
the PV array completely from the inverter.
Position
Description
Explanation
A
Plug
The plug and the
Bluetooth
antenna are inside
the enclosure.
B
Stickers
‒