Replacing Surge Arresters Type Ii - SMA SUNNY TRIPOWER 8000TL Installation Manual

12 Troubleshooting

12.4 Replacing Surge Arresters Type II

If the inverter is displaying event number "8301" or "8302", presumably at least one surge arrester
is defective.
Surge arresters are wear parts. Their functional efficiency diminishes with age or following repeated
responses as a result of overvoltages. It is therefore possible that one of the surge arresters has lost its
protective function.
SMA Solar Technology AG therefore recommends replacing all surge arresters, since the failure of
one surge arrester is usually due to influences which affect all surge arresters in the same manner
(temperature, age, induced overvoltages). You will find the order numbers for both retrofit kits
(one for input A and one for input B) (see Section 15 "Accessories", page 125).
Replace the surge arresters as described below:
1. Disconnect the inverter (see Section 9 "Disconnecting the Inverter from Voltage Sources",
page 63).
Danger to life due to high voltages in the inverter
Death from electric shock
There is residual voltage in the inverter. The inverter takes 20 minutes to discharge.
• Wait 20 minutes before you open the upper enclosure lid or the DC lid.
2. Release the captive screws of the DC lid on the
left-hand side of the connection area.
3. Lift the DC lid up and off.
90 STP8-17TL-IA-en-31
SMA Solar Technology AG
Installation Manual