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Mean Well NTS-300-248AU True Sine Wave DC-AC Inverter 300W 230V out 48V in with AU Socket

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

SKU NTS-300-248AU

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Overview

NTS-300-248AU is the model of this series: typical efficiency 93%.

NTS-300 is a 300W highly reliable 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, 600W peak power, adjustable AC output voltage and frequency, -25~+65℃ wide operating temperature range, complete protections features, and etc. combined with batteries, the NTS-300 is suitable for use in residential, commercial, marine, automobile, mine, construction site, 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, electromechanical tool, communication equipment, power distribution cabinet, outdoor camping equipment, marine AC power, factory equipment, and etc.

Features

Compact size and light weight
True sine wave output (THD<3%)
High surge power up to 600W
Fanless design
AC output voltage and frequency selectable by DIP S.W
No load disspation <1.5W max. at standby saving mode
-25℃~+65℃ wide operating temperature
Power ON-OFF remote control
Front panel indicator for operation status
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
Carry handle accessory available(Order NO.: Carry handle, sold separately)
Conformal coating
3 years warranty

Specifications

NTS-300-248AUSpecifications from the official datasheet (2024-11-25 edition)

AC OUTPUT

RATED POWER(Continuous): 300W
OVER RATED POWER(3 Min.): 345W
PEAK POWER(10 Sec.): 450W
SURGE POWER(30 Cycles): 600W
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
FRONT PANEL LED: Please refer to page5

DC INPUT

DC VOLTAGE: 48V
VOLTAGE RANGE (Typ.): 40 ~ 66Vdc
DC CURRENT (Typ.): 8A
NO LOAD NON-SAVING MODE: 12W
NO LOAD SAVING MODE (Typ.): Default disable, ≦1.2W ~ 1.5W by models @ auto detec AC output load ≦10W will be changed to saving mode 1.5W
OFF MODE CURRENT DRAW: ≦1mA
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
GFCI PROCTECTION: None

FUNCTION

REMOTE CONTROL: Power ON-OFF remote control by front panel dry contact connector (by RELAY); Open : Normal work ; Short ,Remote off

ENVIRONMENT

WORKING TEMP.: -25 ~ +65℃(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

SAFETY STANDARDS: CB IEC62368-1,CSA/UL62368-1,Dekra BS EN/EN62368-1,E13,EAC TP TC 004 approved;Design refer to AS/NZS 62368.1 (Please refer to next page “AC output socket” table for more details ) ; Design refer to UL458( By request )
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(expect for Type-UN) Class A
Radiated BS EN/EN55032(CISPR32) for 212,224,248 only(expect for Type-UN) 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 3, 8KV air; Level 2, 4KV contact
Radiated BS EN/EN61000-4-3 Level 2, 3V/m
Magnetic Field BS EN/EN61000-4-8 Level 1, 1A/m

Parameter	Standard	Test Level
Radiated	FCC for 112,124,148 only(expect for Type-UN)	Class A
Radiated	BS EN/EN55032(CISPR32) for 212,224,248 only(expect for Type-UN)	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 3, 8KV air; Level 2, 4KV contact
Radiated	BS EN/EN61000-4-3	Level 2, 3V/m
Magnetic Field	BS EN/EN61000-4-8	Level 1, 1A/m

OTHERS

MTBF: 845.6K hrs min. Telcordia TR/SR-332 (Bellcore) ; 85.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 210*130*55mm (L*W*H)
PACKING: 1.3Kg; 8pcs/ 11.4Kg/ 1.74CUFT

Test conditions and notes4

1.Efficiency, AC regulation and THD are tested by 300W, 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-300-248AU AC Output Socket — AC Output Socket

NTS-300-248AU DERATING CURVE — DERATING CURVE

NTS-300-248AU AC Output Voltage、Frequency、Power — AC Output Voltage、Frequency、Power

NTS-300-248AU MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

NTS-300-248AU Accessory List — Accessory List

NTS-300-248AU TYPICAL APPLICATION — TYPICAL APPLICATION

Typical applications

Downloads

Certificates6

MeanWell NTS-300 and NTS-450 Certificate PDF Download

FAQ

What is the Mean Well NTS-300-248AU designed for?

The NTS-300-248AU is a 300W true sine wave DC-AC inverter that converts 48V DC input to 230V AC output. It is intended for applications that need clean AC power from a 48V battery-based system, and this version includes an AU socket.

Is the output suitable for sensitive AC equipment?

Yes. This model provides a true sine wave output with THD below 3%, which is generally preferred for equipment that performs best on clean, stable AC power. That makes it a stronger choice than modified sine wave inverters for many sensitive loads.

How much power can this inverter deliver?

The NTS-300-248AU is rated for 300W continuous output power. It also supports surge power up to 600W, which helps it handle short startup peaks from compatible loads.

What battery types can this inverter work with?

This model is suitable for 48V lead-acid or lithium-ion battery systems. It also includes battery over-discharge protection with low voltage disconnect to help protect the connected battery source.

Can this inverter be used in demanding environmental conditions?

It is built for a wide operating temperature range up to 65°C and includes conformal coating for added durability. Mean Well also specifies an output derating curve for temperature-related performance, so operating conditions should be considered in harsher environments.

Does this model use a cooling fan?

No. The NTS-300-248AU uses a fanless design, which can help reduce noise and lower maintenance concerns in suitable installations. Its compact size and 1.3 kg weight also make it easier to place where space is limited.

What protection features are included in this inverter?

This inverter includes output short circuit, overload and over-temperature protection, input reverse polarity, DC low and over voltage protection, along with battery over-discharge protection. On short circuit, overload or over temperature it shuts down the output and requires re-powering to recover.

What standards and approvals does the NTS-300-248AU meet?

Mean Well lists this model as approved to CB IEC62368-1, Dekra BS EN/EN62368-1, E13, and EAC TP TC 004, with design reference to AS/NZS 62368.1. EMC compliance includes EN55032 Class A and BS EN/EN61000-4-2, -3, and -8.

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Model	Power	Voltage	Waveform	Frequency
Mean Well NTS-300-224AU True Sine Wave DC-AC Inverter 300W 230V out 24V in with AU Socket	300W	230V	True Sine Wave	50Hz	View
Mean Well NTS-300-212AU True Sine Wave DC-AC Inverter 300W 230V out 12V in with AU Socket	300W	230V	True Sine Wave	50Hz	View

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