Fault codes › SMA › Sunny Boy 3.0-7.7-US (SBx.x-1SP-US-41)

SMA SB-US-41 3901

Code: 3901
Page: 60
ID: fc:sma-sb-us-41-3901
IRI: https://solarlattice.org/kb/fc/sma-sb-us-41-3901
Status: active
Also known as: 3901, SMA 3901
Category: Inverters

Class not stated

Production stops drafted · lead

Clears by itself drafted · lead

Decoded

Reports insufficient DC input power; look at PV array; do: avoiding partial shading, inverter parameter adjustment, string configuration correction, firmware update.

What can be behind Insufficient DC input power

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

Defined in

SBxx-US-1XP-41-BA-en-12 — SMA · page 60 drafted · lead
- sec=6.2.29 h=21f654ac028d

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

Same condition on other equipment

Same code in other families

Claims

`defined_in`

c1 drafted · lead SBxx-US-1XP-41-BA-en-12

SBxx-US-1XP-41-BA-en-12 sec=6.2.29 h=21f654ac028d

`reports`

c2 drafted · lead Insufficient DC input power

SBxx-US-1XP-41-BA-en-12 sec=6.2.29 h=21f654ac028d
SBxx-US-1XP-41-BA-en-12 sec=h301 h=e2d0be7e71d1
SBxx-US-1XP-41-BA-en-12 sec=h302 h=27c1c9381a5e
SBSExx-US-50-BE-en-11 sec=11.1.32 h=d493efa5c96e
SBSExx-US-50-BE-en-11 sec=h576 h=e2d0be7e71d1
SBSExx-US-50-BE-en-11 sec=h577 h=27c1c9381a5e
STPxx-US-50-BE-en-14 sec=11.1.21 h=110d8e4104f6
STPxx-US-50-BE-en-14 sec=h470 h=e2d0be7e71d1
STPxx-US-50-BE-en-14 sec=h471 h=27c1c9381a5e

review note: support check: partial - Waiting for DC start conditions and feed-in conditions unmet, with irradiation remedies, imply insufficient DC power but it is not…

`affects`

c3 drafted · lead PV array

SBxx-US-1XP-41-BA-en-12 sec=h303 h=86dadeb7c059
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2
STPxx-US-50-BE-en-14 sec=h472 h=86dadeb7c059

`has_production_effect`

c4 drafted · lead Trip (production stops)

Feed-in has not started because start conditions are not yet met.

SBxx-US-1XP-41-BA-en-12 sec=h302 h=27c1c9381a5e
SBSExx-US-50-BE-en-11 sec=h577 h=27c1c9381a5e
STPxx-US-50-BE-en-14 sec=h471 h=27c1c9381a5e

review note: support check: partial - Feed-in conditions not yet fulfilled is stated, but nothing says it is a trip or stops production; it is more…

`has_recovery`

c5 drafted · lead Auto-reset (clears by itself)

Normal case clears with higher irradiation; frequent recurrence calls for parameter or array checks.

SBxx-US-1XP-41-BA-en-12 sec=h303 h=86dadeb7c059
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2
STPxx-US-50-BE-en-14 sec=h472 h=86dadeb7c059

review note: support check: partial - Waiting for higher irradiation implies it clears on its own, but auto-reset is not explicitly stated.

`mitigated_by`

c6 verified · fact Avoiding partial shading

SBxx-US-1XP-41-BA-en-12 sec=h303 h=86dadeb7c059
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2
STPxx-US-50-BE-en-14 sec=h472 h=86dadeb7c059

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

c7 drafted · lead Inverter parameter adjustment

When the message appears frequently in the morning.

SBxx-US-1XP-41-BA-en-12 sec=h303 h=86dadeb7c059
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2
STPxx-US-50-BE-en-14 sec=h472 h=86dadeb7c059

c8 drafted · lead String configuration correction

When the message appears frequently at medium irradiation.

SBxx-US-1XP-41-BA-en-12 sec=h303 h=86dadeb7c059
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2
STPxx-US-50-BE-en-14 sec=h472 h=86dadeb7c059

c9 drafted · lead Firmware update

SBSExx-US-50-BE-en-11 sec=11.1.32 h=d493efa5c96e
SBSExx-US-50-BE-en-11 sec=h578 h=64c1ff830bc2

`applies_to`

c10 drafted · lead Sunny Boy 3.0-7.7-US-41 proposed

SBxx-US-1XP-41-BA-en-12 sec=6.2.29 h=21f654ac028d

SMA SB-US-41 3901

Decoded

What can be behind Insufficient DC input power

Defined in

Same condition on other equipment

Same code in other families

Claims

defined_in

reports

affects

has_production_effect

has_recovery

mitigated_by

applies_to

Data