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SMA Solar Technology AG Troubleshooting

Installation Guide SB25_30-IEN092520 39

3. Place the extractor tool into the openings of the

terminal contacts (1).

☑ The terminal clamps loosen up.

If you do not receive an extractor tool for operating

the terminal clamps with your replacement

varistors, contact SMA Solar Technology. As an

alternative, the terminal contacts can be operated

using a 3.5 mm wide screwdriver.

4. Remove the varistor (2).

5. Insert new varistor.

The pole with the small loop (crimp) must be fitted

to terminal A (3) when remounting.

6. Close the Sunny Boy as described in section 7.2 "Closing the Sunny Boy" (page33).

☑ The check of the varistors is completed.

☑There is no conducting

connection.

The respective varistor is not working and must be

replaced.

Varistor failure is generally due to influences which affect

all varistors similarly (temperature, age, induced

overvoltage). It is therefore recommended that you

replace both varistors.

The varistors are specially manufactured for use in the

Sunny Boy and are not commercially available. They must

be ordered directly from SMA Solar Technology (see

section 12 "Accessories" (page46)).

• To replace the varistors, proceed to step 3.

NOTICE!

The Sunny Boy could be irreparably damaged by overvoltage!

If varistors are missing, the Sunny Boy is no longer protected against overvoltages.

• Replacement varistors should be obtained as soon as possible.

•Do not operate the Sunny Boy without varistors in systems with a high risk of

overvoltages.

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PV Powered 2500 Installationsanleitung Seite 39