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Mean Well NTS-250P-212 True Sine Wave DC-AC Inverter 250W 230V out 12V in

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

SKU NTS-250P-212

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Overview

NTS-250P-212 is the model of this series: typical efficiency 92%.

NTS-250P is a 250W 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, fanless quiet design, 500W 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-250P 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 500W
Fanless design, cooling by free air convection
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-250P-212Specifications from the official datasheet (2026-03-26 edition)

AC OUTPUT

RATED POWER(Continuous): 250W
OVER RATED POWER(3 Min.): 287.5W
PEAK POWER(10 Sec.): 375W
SURGE POWER(30 Cycles): 500W
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: 12V
VOLTAGE RANGE (Typ.): 10 ~ 16.5Vdc
DC CURRENT (Typ.): 25A
NO LOAD DISSIPATION (Typ.) Non-Saving mode: 10W
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 1.2W
OFF MODE CURRENT DRAW: <1mA at battery ~DC input must be disconnected
EFFICIENCY (Typ.)^Note.1: 92%
BATTERY TYPES: Lead Acid or Li-ion

PROTECTION

FUSE(Internal): 30A*2
DC INPUT LOW ALARM: 11±0.3Vdc
DC INPUT LOW SHUTDOWN: 10±0.3Vdc
DC INPUT LOW RESTART: 12.5±0.3Vdc
DC INPUT HIGH ALARM: 15.5±0.3Vdc
DC INPUT HIGH SHUTDOWN: 16.5±0.3Vdc
DC INPUT HIGH RESTART: 15±0.3Vdc
BAT. POLARITY: By internal fuse open
AC OUTPUT OVER TEMPERATURE: Protection type : Shut down o/p voltage, re-power on to recover
AC OUTPUT OUTPUT SHORT: Protection type : Shut down o/p voltage, re-power on to recover
AC OUTPUT 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

SAFETY STANDARDS: CB IEC62368-1 2ed, CSA/UL 62368-1 3ed for all models; E13, EAC TPTC004, AS/NZS 62368.1 for NTS-250P-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: 836.9K hrs min. Telcordia TR/SR-332 (Bellcore) ; 84K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 186*100.5*34mm (L*W*H)
PACKING: 0.87Kg; 18pcs/ 16.6Kg/ 1.01CUFT

Test conditions and notes4

1.Efficiency, AC regulation and THD are tested by 250W, 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-250P-212 Safety Overview — Safety Overview

NTS-250P-212 Block Diagram — Block Diagram

NTS-250P-212 DERATING CURVE — DERATING CURVE

NTS-250P-212 Remote ON-OFF Control — Remote ON-OFF Control

NTS-250P-212 AC output voltage、Frequency、Power — AC output voltage、Frequency、Power

NTS-250P-212 MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

NTS-250P-212 Accessory List — Accessory List

NTS-250P-212 TYPICAL APPLICATION — TYPICAL APPLICATION

Typical applications

Downloads

Certificates5

NTS-250P and NTS-400P Certificate PDF Download

FAQ

What type of output does the Mean Well NTS-250P-212 provide?

The NTS-250P-212 provides a true sine wave AC output with total harmonic distortion below 3%. It is rated for 250W continuous output and is designed for 12V DC input with 230V AC output. This makes it a good fit where cleaner AC power is preferred over modified sine wave alternatives.

Can this inverter handle startup surges above its 250W continuous rating?

Yes. This model supports surge power up to 500W, which helps with equipment that briefly draws more power at startup than during normal operation. Buyers should still make sure the connected load stays within the inverter's specified operating limits.

Is the NTS-250P-212 suitable for sensitive electronics?

It can be a suitable option for equipment that benefits from a true sine wave output, since this model keeps THD below 3%. Compared with basic modified sine wave inverters, it is intended to provide cleaner AC power. Final suitability still depends on the power requirements of the specific device being used.

What battery types is this inverter compatible with?

The NTS-250P-212 is specified as suitable for both lead-acid and lithium-ion batteries. It also includes DC input low-voltage shutdown at 10±0.3VDC to protect against battery over-discharge. That makes it relevant for mobile and off-grid DC power systems using 12V battery sources.

What environments is this inverter designed for?

This model has a wide operating temperature range of -20°C to +70°C, subject to the output derating curve. The curve covers natural convection cooling and forced air with a 10CFM fan, which can be connected to the unit's fan connector. It is also rated for 10 to 500Hz, 3G vibration, supporting use in demanding industrial or mobile environments where compact size is valued.

Does this inverter offer selectable AC output settings?

Yes. The AC output voltage is selectable by DIP switch between 200, 220, 230 and 240VAC, and the output frequency is selectable by DIP switch between 50Hz and 60Hz. For this specific model, the factory setting is 230V AC, 50Hz output from a 12V DC input.

What protections and approvals does the NTS-250P-212 include?

The inverter includes AC output short circuit, overload and over-temperature protection, DC input low- and high-voltage shutdown, and battery reverse-polarity protection by internal fuse. The NTS-250P-212 is listed with CB IEC62368-1 and CSA/UL 62368-1, plus E13, EAC TPTC004, and AS/NZS 62368.1 approvals for this model variant.

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Model	Power	Voltage	Waveform	Frequency
Mean Well NTS-250P-248 True Sine Wave DC-AC Inverter 250W 230V out 48V in	250W	230V	True Sine Wave	50Hz	View
Mean Well NTS-250P-224 True Sine Wave DC-AC Inverter 250W 230V out 24V in	250W	230V	True Sine Wave	50Hz	View

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