SMA Solar Technology AG Failure Search
Installation Guide SB20_25_30HF-IEN102911 77
4. Use a Multimeter to ensure that all of the varistors
in the installed state have a conducting connection
between connectors B and C.
NOTICE!
Electrostatic discharges can damage the inverter.
Internal components of the inverter can be irreparably damaged by electrostatic
discharge.
• Ground yourself before touching a component.
NOTICE!
Excessive voltages can destroy the measuring device.
• Only use measuring devices with a DC input voltage range up to at least 1,000 V.
Result Action
☑There is a conducting
connection.
There is probably a different fault in the inverter.
• Continue with point 9.
• Consult the SMAServiceline for details on further
procedure.
☑There is no conducting
connection.
The respective varistor is defective and must be replaced.
Varistor failure is generally due to influences which affect all
varistors similarly (temperature, age, induced overvoltages).
SMA Solar Technology AG recommends that you replace all
varistors.
The varistors are specially manufactured for use in the inverter
and are not commercially available. They must be ordered
directly from SMA Solar Technology AG
(see section 14”Accessories” (page92)).
• To replace the varistors, proceed to step 5.
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