SMA SB 2500TL-21 Installation - Manual (Page 19)

SMA Solar Technology AG Product Description
Installation Manual SB25-30TLST-21-IA-en-13 19
4.5 Electronic Solar Switch
The ESS is an optional DC load disconnect unit. The ESS prevents electric arcs from forming when you
remove the DC connector.
When plugged in, the ESS forms a conductive path between the PV array and the inverter. Removing
the ESS interrupts the electric circuit and allows you to safely disconnect the DC connectors from the
inverter.
Item Description Explanation
A Plug ‒
B Safety precautions
sticker • Never operate the inverter without the lower enclosure
lid in place.
• Observe all documentation that accompanies the
inverter.
C ESS sticker • When the ESS is plugged in, the DC electric circuit
remains closed.
• To interrupt the DC electric circuit, you first need to
perform steps 1 and 2.
• Remove the ESS.
• Remove all DC connectors.
B
A
C