SMA Solar Technology AG
10 Troubleshooting
Installation Manual
SB13_21TL-IA-en-65
53
10.4 Checking the ESS for Wear
The ESS is an optional device. Depending on the design of the ESS, you can recognise wear either
on the metal tabs or on the plastic casing of the ESS.
1. Remove the ESS.
2. Check the metal tabs or plastic inside the ESS.
There should be no visible discoloration or damage
on the metal tabs or the plastic.
If the metal tabs show brown discolouration or are
burnt out or the plastic is damaged, the ESS is worn.
This means that the ESS can no longer disconnect the
PV array reliably. Order a new ESS to replace the
damaged one (see Section 13 "Accessories",
page 65).
5. Commission the inverter (see Section 7.4).
3.
Risk of fire due to tightening of the ESS screw
Perfect contact between the ESS and the inverter can only be guaranteed if the ESS plug
remains flexible.
• Do not tighten the screw in the plug of the ESS.
4.
Damage to the inverter due to moisture and dust penetration
If the ESS is not plugged in or incorrectly plugged in during operation, moisture and dust can
penetrate the inverter. If the ESS is not correctly plugged in, the ESS contacts may be subject to
wear, or the ESS may detach from the socket. This can result in yield loss and damage to the
ESS.
Always plug the ESS in as follows:
• Firmly plug the ESS in until it is flush with the enclosure.
• Ensure that the gap between the ESS and the enclosure is no more than 1 mm.
