Solar Lattice

Fault codes › SMA › Sunny Island 4548-US / 6048-US

SMA SI-US W785

Code: W785
Shown as: Slave does not receive a Syncpuls Slave 2
Vendor severity: 1
Page: 216
ID: fc:sma-sunny-island-us-w785
IRI: https://solarlattice.org/kb/fc/sma-sunny-island-us-w785
Status: active
Also known as: W785, w785, SMA W785, Slave does not receive a Syncpuls Slave 2
Category: Inverters

Class warning drafted · lead

Production not stated

Clears not stated

Decoded

Reports missing synchronization pulse.

What can be behind Missing synchronization pulse

Failure modes that present as the reported condition, and the tests that tell them apart.

Communication bus wiring or termination fault drafted · lead
Parallel inverter synchronization fault drafted · lead

Defined in

SI4548-6048-US-BE-en-21W — SMA · page 216 drafted · lead
- tbl=152.r23 h=b2a2cf52a260

The manufacturer's own cause and corrective text is not reproduced here.

Same condition on other equipment

SMA: SMA SI-US F783, SMA SI-US W784, SMA SI-US W786

Claims

`defined_in`

c1 drafted · lead SI4548-6048-US-BE-en-21W

SI4548-6048-US-BE-en-21W tbl=152.r23 h=b2a2cf52a260

`has_event_class`

c2 drafted · lead Warning (device continues, a condition is flagged)

from the Type column

SI4548-6048-US-BE-en-21W tbl=152.r23 h=b2a2cf52a260

`reports`

c3 verified · fact Missing synchronization pulse

Applies to slave 2

SI4548-6048-US-BE-en-21W tbl=152.r23 h=b2a2cf52a260

verified by: review-workflowverified on: 2026-10-23

`applies_to`

c4 drafted · lead Sunny Island 4548-US / 6048-US

SI4548-6048-US-BE-en-21W tbl=152.r23 h=b2a2cf52a260

Data