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Victron Energy smallBMS with pre-alarm (BMS400100000)

Model: smallBMS with pre-alarm · SKU: BMS400100000

Prepared Nov 13, 2026

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Common specifications

Series cells	Not documented
Battery chemistry	LiFePO4 (Victron Lithium Battery Smart, 12.8 V or 25.6 V)Source [1]
Continuous discharge current	Not documented
Continuous charge current	Not documented
Balance current	Not documented
Communications	None (no VE.Bus interface, no Bluetooth)Source [1, 3]
Peak discharge current	Not documented
Balancing	Not documented
Heating output	Not documented
Weight	0.1 kg0.22 lb convertedSource [1]
Dimensions	23 D × 42 W × 106 H mm0.91 D × 1.7 W × 4.17 H in convertedSource [1]
Enclosure volume	0.1 L** Calculated from recorded external dimensions
Warranty term	Not documented

All recorded specifications

Battery chemistry	LiFePO4 (Victron Lithium Battery Smart, 12.8 V or 25.6 V)Documented claim Conditions Printed as "These batteries are Lithium Iron Phosphate (LiFePO4) batteries and are available in 12.8 V or 25.6 V", for Victron Energy Lithium Battery Smart batteries, in system voltages of 12 V, 24 V or 48 V. Location: PDF page 1, description Printed as "These batteries are Lithium Iron Phosphate (LiFePO4) batteries and are available in 12.8 V or 25.6 V", for Victron Energy Lithium Battery Smart batteries, in system voltages of 12 V, 24 V or 48 V. Location: PDF page 1, description Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]
Battery fuse or breaker (manual)	power supply fuse 0.3A - 2.5A (not supplied)Documented claim Conditions Printed as "Power supply cable and fuse (not supplied) Recommended fuse size 0.3A - 2.5A, dependent on devices connected to Load disconnect and pre-alarm output" in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 12). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 12 Printed as "Power supply cable and fuse (not supplied) Recommended fuse size 0.3A - 2.5A, dependent on devices connected to Load disconnect and pre-alarm output" in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 12). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 12 Official instruction manual · Victron Energy: smallBMS with pre-alarm manual (rev 02 - 01/2023) [4]
Communication ports (manual)	Load disconnect output; Charge disconnect output; Pre-alarm output; Remote L and Remote HDocumented claim Conditions Printed as "Charge disconnect output Normally high (Vbat – 0.1V) Source current limit: 10mA (short circuit protected) Sink current: 0A (output free floating) Pre-alarm output Normally free floating (low) In case of alarm: output voltage Vbat -0.1V Max output current: 1A (not short circuit protected) Remote on/off: Remote L and Remote H" in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 12). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 12 Printed as "Charge disconnect output Normally high (Vbat – 0.1V) Source current limit: 10mA (short circuit protected) Sink current: 0A (output free floating) Pre-alarm output Normally free floating (low) In case of alarm: output voltage Vbat -0.1V Max output current: 1A (not short circuit protected) Remote on/off: Remote L and Remote H" in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 12). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 12 Official instruction manual · Victron Energy: smallBMS with pre-alarm manual (rev 02 - 01/2023) [4]
Communications	None (no VE.Bus interface, no Bluetooth)Documented claim Conditions The data sheet prints that the smallBMS "does not have a VE.Bus interface"; the overview prints "No" for Bluetooth and data communication in its Small BMS column. Location: Data sheet PDF page 1, description; overview PDF page 2, comparison table, Bluetooth and Data communication rows The data sheet prints that the smallBMS "does not have a VE.Bus interface"; the overview prints "No" for Bluetooth and data communication in its Small BMS column. Location: Data sheet PDF page 1, description; overview PDF page 2, comparison table, Bluetooth and Data communication rows Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF)Official datasheet · BMS Overview [1, 3]
Continuous discharge current	Not documented Conditions Not printed: the smallBMS switches loads and chargers through its outputs (load disconnect source current limit 1A) rather than carrying battery current. Not printed: the smallBMS switches loads and chargers through its outputs (load disconnect source current limit 1A) rather than carrying battery current.
Dimensions	23 D × 42 W × 106 H mm0.91 D × 1.7 W × 4.17 H in convertedDocumented claim Conditions Printed as "Dimensions (h x w x d) 106 x 42 x 23 mm". Location: PDF page 2, Enclosure Printed as "Dimensions (h x w x d) 106 x 42 x 23 mm". Location: PDF page 2, Enclosure Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]
Enclosure	IP20Documented claim Conditions Printed as "Protection grade IP20". Location: PDF page 2, General Printed as "Protection grade IP20". Location: PDF page 2, General Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]
Mounting orientation (manual)	preferably on a flat surfaceDocumented claim Conditions Printed as "Preferably mount the smallBMS on a flat surface." in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 11). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 11 Printed as "Preferably mount the smallBMS on a flat surface." in Victron Energy's smallBMS with pre-alarm manual (rev 02 - 01/2023) (PDF page 11). The manual applies to this model: Manual is specific to the smallBMS with pre-alarm (record: smallBMS with pre-alarm, BMS400100000). Location: PDF page 11 Official instruction manual · Victron Energy: smallBMS with pre-alarm manual (rev 02 - 01/2023) [4]
Operating temperature	-20 to 50 °C-4 to 122 °F convertedDocumented claim Conditions Printed as "Operating temperature range -20 to +50 °C". Location: PDF page 2, General Printed as "Operating temperature range -20 to +50 °C". Location: PDF page 2, General Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]
Operating voltage range	8 to 70 VDocumented claim Conditions Printed as "Operating voltage (Vbat) 8" to "70 VDC" in the data sheet's table. Location: PDF page 2, Operating voltage (Vbat) Printed as "Operating voltage (Vbat) 8" to "70 VDC" in the data sheet's table. Location: PDF page 2, Operating voltage (Vbat) Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]
Weight	0.1 kg0.22 lb convertedDocumented claim Conditions Printed as "Weight 0.1 kg". Location: PDF page 2, Enclosure Printed as "Weight 0.1 kg". Location: PDF page 2, Enclosure Official datasheet · Victron Energy smallBMS with pre-alarm data sheet (PDF) [1]

Warranty

Certificate records

No records documented.

Sources and revisions

Victron Energy smallBMS with pre-alarm data sheet (PDF)Official datasheet · Checked Oct 9, 2026https://www.victronenergy.com/upload/documents/Datasheet-smallBMS-with-pre-alarm-EN-.pdf
SmallBMS with pre-alarm, Victron Energy product page (October 9, 2026 capture)Official product page · Checked Oct 9, 2026https://www.victronenergy.com/battery-management-systems/smallbms
BMS OverviewOfficial datasheet · Checked Sep 18, 2026https://www.victronenergy.com/upload/documents/Datasheet-BMS-overview-EN.pdf
Victron Energy: smallBMS with pre-alarm manual (rev 02 - 01/2023)Official instruction manual · Checked Oct 15, 2026https://www.victronenergy.com/upload/documents/smallBMS_with_pre-alarm/128558-smallBMS_with_pre-alarm-pdf-en.pdf