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Mean Well NTS-400P-248 True Sine Wave DC-AC Inverter 400W 230V out 48V in

fanless designhigh efficiency up to 93%200% peak power capabilitybuilt-in dip switch to adjust AC output voltagefrequency and work mode

SKU NTS-400P-248

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Overview

NTS-400P-248 is the model of this series: typical efficiency 93%.

NTS-400P is a 400W highly reliable built-in type off-grid true sine wave DC-AC power inverter. Its key features include: digital design with MCU control, streamlined control circuitry that quickly responds to environmental changes and improves reliability, compact size, light weight, 800W peak power, adjustable AC output voltage and frequency, -20~+70℃ wide operating temperature range, built-in remote ON/OFF control, low no-load power consumption (energy saving mode < 1.5W max. ), complete protection features, and etc. Combined with batteries, the NTS-400P is suitable for use in residential, commercial, marine, automobile, and remote areas with no access to utility power, and the output can be used to power fans, TV, radio, phone charger, PC/laptop, lighting, outdoor camping equipment, marine AC power, and etc.

Features

Compact size and light weight
True sine wave output (THD<3%)
High surge power up to 800W
250W convection, 400W forced air
AC output voltage and frequency selectable by DIP S.W
No load dissipation <1.5W max. at standby saving mode
-20℃~+70℃ wide operating temperature
Power ON-OFF remote control
Protections : Input : Reverse polarity / DC low alarm / DC low shutdown / Over voltage Output : Short circuit / Overload / Over temp.
Battery over discharge protection (Low voltage disconnect)
Suitable for lead-acid or li-ion batteries
Support Tx/Rx for monitoring power inverter status
Conformal coating
3 years warranty

Specifications

NTS-400P-248Specifications from the official datasheet (2026-03-26 edition)

AC OUTPUT

RATED POWER(Continuous): 400W
OVER RATED POWER(3 Min.): 460W
PEAK POWER(10 Sec.): 600W
SURGE POWER(30 Cycles): 800W
AC VOLTAGE: Default setting set at 230VAC 200 / 220 / 230 / 240Vac selectable by DIP S.W
FREQUENCY: Default setting set at 50Hz±0.1Hz 50/60Hz selectable by DIP S.W
WAVEFORM^Note.1: True sine wave (THD<3%)
AC REGULATION: ±3.0% at rated output voltage
LED STATUS: Please refer to page3

DC INPUT

DC VOLTAGE: 48V
VOLTAGE RANGE (Typ.): 40 ~ 66Vdc
DC CURRENT (Typ.): 10A
NO LOAD DISSIPATION (Typ.) Non-Saving mode: 12W
NO LOAD DISSIPATION (Typ.) Saving mode: Default disable, ≦1.2W ~ 1.5W by models @ auto detec AC output load ≦10W will be changed to saving mode
NO LOAD DISSIPATION (Typ.) Saving mode: 1.5W
OFF MODE CURRENT DRAW: <1mA at battery ~DC input must be disconnected
EFFICIENCY (Typ.)^Note.1: 93%
BATTERY TYPES: Lead Acid or Li-ion

PROTECTION

FUSE(Internal): 10A*2
DC INPUT LOW ALARM: 44±1Vdc
DC INPUT LOW SHUTDOWN: 40±1Vdc
DC INPUT LOW RESTART: 50±1Vdc
DC INPUT HIGH ALARM: 62±1Vdc
DC INPUT HIGH SHUTDOWN: 66±1Vdc
DC INPUT HIGH RESTART: 60±1Vdc
BAT. POLARITY: By internal fuse open
OVER TEMPERATURE: Protection type : Shut down o/p voltage, re-power on to recover
OUTPUT SHORT: Protection type : Shut down o/p voltage, re-power on to recover
OVER LOAD (Typ.): 105 ~ 115% load for 180 sec., 115% ~ 150% load for 10 sec. Protection type : Shut down o/p voltage, re-power on to recover

FUNCTION

REMOTE CONTROL: Power ON-OFF remote control by front panel dry contact connector (by RELAY), Open : Normal work ; Short : Remote off
Tx/Rx: Support Tx/Rx for monitoring power inverter status

ENVIRONMENT

WORKING TEMP.: -20 ~ +70℃(Refer to “Derating curve”)
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -30 ~ +70℃ / -22 ~ +158℉, 10 ~ 95% RH non-condensing
VIBRATION: 10 ~ 500Hz, 3G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.4)

SAFETY STANDARDS: CB IEC62368-1 2ed, CSA/UL 62368-1 3ed for all models; E13, EAC TPTC004, AS/NZS 62368.1 for NTS-400P-212/224/248 approved (Please refer to next page “Safety overview” table for more details)
WITHSTAND VOLTAGE: DC I/P - AC O/P:3.0KVac AC O/P - FG:1.5KVac
EMC EMISSION: Parameter Standard Test Level

Radiated FCC for 112,124,148 only Class A
Radiated BS EN/EN55032(CISPR32) for 212,224,248 only Class A
Harmonic Current BS EN/EN61000-3-2
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55024, BS EN/EN55035

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 4, 15KV air; Level 4, 8KV contact
Radiated BS EN/EN61000-4-3 Level 3, 10V/m
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m

Parameter	Standard	Test Level
Radiated	FCC for 112,124,148 only	Class A
Radiated	BS EN/EN55032(CISPR32) for 212,224,248 only	Class A
Harmonic Current	BS EN/EN61000-3-2
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 4, 15KV air; Level 4, 8KV contact
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m

OTHERS

MTBF: 836.2K hrs min. Telcordia TR/SR-332 (Bellcore) ; 84K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 186*100.5*34mm (L*W*H)
PACKING: 0.75Kg; 18pcs/ 14.5Kg/ 1.01CUFT

Test conditions and notes4

1.Efficiency, AC regulation and THD are tested by 400W, linear load at 12.5Vdc/25Vdc/50Vdc input voltage.
2.All parameters not specified above are measured at rated load, 25℃ of ambient temperature and set to factory setting.
3.Internal pre-start circuit, the setup time is 8s.
4.The power supply is considered as an independent unit, but the final equipment still need to re-confirm that the whole system complies with the EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )

Technical drawings

NTS-400P-248 Safety Overview — Safety Overview

NTS-400P-248 Block Diagram — Block Diagram

NTS-400P-248 DERATING CURVE — DERATING CURVE

NTS-400P-248 Remote ON-OFF Control — Remote ON-OFF Control

NTS-400P-248 AC output voltage、Frequency、Power — AC output voltage、Frequency、Power

NTS-400P-248 MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

NTS-400P-248 Accessory List — Accessory List

NTS-400P-248 TYPICAL APPLICATION — TYPICAL APPLICATION

Typical applications

Downloads

Certificates7

Mean Well NTS-250P-400P-ICES Certificate PDF Download

Mean Well NTS-250P-400P-CB Certificate PDF Download

Mean Well NTS-250P-400P-E13 Certificate PDF Download

Mean Well NTS-250P-400P-FCC Certificate PDF Download

Mean Well NTS-250P-400P-EMC Certificate PDF Download

Mean Well NTS-250P-400P-CE-dec Certificate PDF Download

Mean Well NTS-250P-400P-UK-dec Certificate PDF Download

Test reports1

Mean Well NTS-400P-248 Test Report PDF Download

FAQ

What is the Mean Well NTS-400P-248 used for?

The NTS-400P-248 is a 400W true sine wave DC-AC inverter designed to convert 48V DC input power into 230V AC output. It is suited to professional and industrial applications where clean AC power is needed from a DC battery-based system. Its true sine wave output makes it a better fit for sensitive electronics than modified sine wave alternatives.

Does this inverter provide true sine wave output?

Yes. The NTS-400P-248 provides a true sine wave AC output with total harmonic distortion below 3%. That makes it appropriate for equipment that requires stable, clean AC power quality.

What input and output voltages does this model support?

This model is designed for 48V DC input (40 to 66VDC range) and delivers 230V AC output by default. The AC output voltage is selectable by DIP switch between 200/220/230/240VAC, and the frequency between 50Hz (default) and 60Hz. For this specific SKU, the named configuration is 230V out from 48V in.

How much power can the NTS-400P-248 deliver?

The rated continuous output power is 400W, with 460W for 3 minutes, 600W peak for 10 seconds and surge power up to 800W. The derating curve gives separate ratings for natural convection and forced air with a 10CFM fan, so available output depends on the cooling and ambient temperature around the inverter.

Is the NTS-400P-248 compatible with lead-acid and lithium-ion battery systems?

Yes. Mean Well specifies that this inverter is suitable for both lead-acid and li-ion batteries. It also includes DC input low-voltage protection, with an alarm at 44V and shutdown at 40V, which helps protect the connected battery system.

Can this inverter be used in demanding environmental conditions?

It is designed for a wide operating temperature range of -20°C to +70°C, with derating referenced by the manufacturer. It is also rated for 20% to 90% RH non-condensing humidity and 10 to 500Hz, 3G vibration. Buyers should still confirm that their full application conditions align with the product's published limits.

What protections and monitoring features are included?

The NTS-400P-248 includes output short circuit, overload and over-temperature protection, DC input low and high voltage alarm and shutdown, and battery reverse polarity protection by internal fuse. Mean Well also specifies support for Tx/Rx status monitoring and remote power on-off control. These features make the unit more suitable for managed OEM and industrial power systems.

What are the physical size and warranty for this inverter?

The listed dimensions are 186 x 100.5 x 34 mm, and the product weight provided is 0.75 kg. The datasheet does not state a warranty period, so please confirm warranty terms with the seller. Its compact form factor is useful where panel or enclosure space is limited.

Payment & Security

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Model	Power	Voltage	Waveform	Frequency
Mean Well NTS-400P-224 True Sine Wave DC-AC Inverter 400W 230V out 24V in	400W	230V	True Sine Wave	50Hz	View
Mean Well NTS-400P-212 True Sine Wave DC-AC Inverter 400W 230V out 12V in	400W	230V	True Sine Wave	50Hz	View

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