MEAN WELL NPP-750-48 combines a three-stage lead-acid battery charger and an adjustable DC power supply in one unit. It provides up to 11.3 A and 759.36 W, with default boost/float voltages of 57.6/55.2 V. Select the operating mode with the front control-connector jumper and apply the output, input and thermal limits.
Product Datasheet
Download MEAN WELL NPP-750 Datasheet (PDF)
The NPP-750 section is on PDF pages 10, 11, 12, 13, 14, 15, 16, 17, 18. Refer to the complete mechanical drawings and notes when planning installation.
Model identity and operating modes
| Full model |
NPP-750-48 |
| Series and product type |
NPP-750 dual-purpose battery charger and AC/DC power supply. |
| Voltage code |
48 V class; the actual default charging and supply voltages are specified below. |
| Mode selection |
CN71 pins 3 and 4 open: battery charger, the default mode. Pins 3 and 4 connected by a jumper: power supply. |
One unit provides selectable lead-acid charging or constant-voltage power for general loads. Select the required mode and settings before connecting the intended load.
Typical applications include radio backup systems, electric-scooter charging, vehicle equipment, surveillance, industrial automation and control. Suitability depends on the battery, load and installation requirements.
Battery charging output
| Default boost charge voltage |
57.6 V |
| Default float charge voltage |
55.2 V |
| Maximum output current |
11.3 A |
| Maximum output power |
759.36 W |
| Output voltage adjustment range |
42 to 80 V, by the built-in potentiometer. |
| Charging current adjustment range |
5.65 to 11.3 A, by the built-in potentiometer (50–100% of maximum current). |
| Recommended battery capacity |
40 to 130 Ah; confirm the allowable charging current with the battery manufacturer. |
| Battery types |
Lead-acid: flooded, Gel and AGM. |
Three-stage charging uses constant current, then constant voltage at 57.6 V, followed by float at 55.2 V. The illustrated transition to float occurs at 10% of the constant-current level. The charger-mode specification identifies Vfloat as adjustable by the voltage potentiometer.
Match the selected voltage and current to the particular battery. A different battery specification may require charger modification; consult the battery manufacturer and MEAN WELL before use.
Power-supply mode output
| Default DC supply voltage |
57.6 V |
| Rated output current |
11.3 A |
| Rated output power |
759.36 W |
| Power-supply voltage adjustment |
42 to 80 V, via the built-in voltage potentiometer. |
| Power-supply current adjustment |
5.65 to 11.3 A, via the built-in current potentiometer. |
| Maximum ripple and noise |
480 mVp-p, power-supply mode. |
| Voltage tolerance |
±1.0%, power-supply mode. |
| Line regulation |
±0.5%, power-supply mode. |
| Load regulation |
±0.5%, power-supply mode. |
| Set-up / rise time |
1800 / 60 ms at 230 VAC and full load. |
| Typical hold-up time |
16 ms at 230 VAC and 75% load; 10 ms at 230 VAC and full load. |
The maximum current is 11.3 A and the rated power limit is 759.36 W in power-supply mode. Output voltage multiplied by output current must remain at or below that power limit.
The output-current curve holds 100% through 67.2 V, then steps down to 80% in the upper voltage region through 80 V. Apply this limit together with the rated power, input-voltage and temperature limits.
Input and efficiency
| AC input range |
90–264 VAC, full-range input. |
| DC input range |
127–370 VDC. |
| Input frequency |
47–63 Hz. |
| Typical power factor |
>0.98 at 115 VAC and >0.95 at 230 VAC, at full load. |
| Typical efficiency |
93%; the charger-mode efficiency measurement uses 67.2 V charge voltage. |
| Typical AC input current |
8.7 A at 115 VAC; 4 A at 230 VAC. |
| Typical inrush current |
50 A cold start at 230 VAC. |
The 60 Hz input curve gives 90% output current at 90 VAC and 100% from 100 through 264 VAC. Apply the thermal and output-voltage limits as well.
The block diagram shows active inrush limiting and PFC, with 80 kHz PFC and 60 kHz PWM switching frequencies.
Protection and recovery
| Short-circuit protection |
Constant-current limiting followed by shutdown after 5 seconds; reapply input power to recover. The charger note specifies a short occurring after turn-on. |
| Power-supply overload protection |
105–115% of rated output power; constant-current limiting followed by shutdown after 5 seconds; reapply input power to recover. |
| Overvoltage protection |
82 to 100 V; output shutdown and latch-off; reapply input power to recover. |
| Overtemperature protection |
Output shutdown; automatic recovery after the temperature decreases. |
Control interface and indication
| Control connector |
CN71: HRS DF11-14DP-2DS or equivalent. |
| Mating housing |
HRS DF11-14DS or equivalent. |
| Mating contact family |
HRS DF11-**SC or equivalent; select the complete contact reference for the wire assembly. |
| Pins 1, 2 and 11–14 |
NC; leave unconnected. |
| Pins 3 and 4 |
Mode selection: open for battery charging; short for power-supply mode. |
| Pin 5 |
Battery Full output: high 4.5–5.5 V when full; low −0.5 to +0.5 V during charging. |
| Pin 6 |
Charger OK / DC OK output: high 4.5–5.5 V during normal operation; low −0.5 to +0.5 V on failure or protection. |
| Pin 7 |
Remote ON-OFF: connect to pin 8 for ON (default); leave open for OFF. |
| Pin 8 |
+12V-AUX, controlled by Remote ON-OFF. |
| Pins 9 and 10 |
GND-AUX: signal return isolated from the main +V and −V output terminals. |
Pins 5 and 6 are TTL outputs only, referenced to GND-AUX pins 9 and 10. Maximum sourcing current is 10 mA. Use the Battery Full indication for charging mode.
Remote control uses a dry contact between pin 7 and +12V-AUX pin 8. The ON level is 10.8–13.2 V and the OFF level is −0.5 to +0.5 V; maximum pin-7 input is 13.2 V.
In charging mode, the status LED is red during constant-current or constant-voltage charging, green during float/full charge, and off for abnormal operation. In power-supply mode it is green for normal operation and off for abnormal operation.
Cooling, derating and environment
| Operating temperature |
−30 to +70°C, subject to derating; −30 to −25°C operation requires 230 VAC input. |
| Horizontal temperature curve |
100% power through 50°C; reduce linearly to 50% at 70°C. |
| Cooling |
Built-in DC fan controlled according to internal temperature. |
| Working humidity |
20–95% RH, non-condensing. |
| Storage temperature and humidity |
−40 to +85°C; 10–95% RH, non-condensing. |
| Temperature coefficient |
±0.05%/°C over 0–50°C. |
| Vibration |
10–500 Hz, 2G; 10 minutes per cycle, 60 minutes each along X, Y and Z. |
For operation above 2000 m, reduce the permitted ambient temperature by 5°C per additional 1000 m for this fan-cooled unit. Keep the air path and vents clear and apply every applicable derating limit.
Safety, EMC and reliability
| Catalogue safety approvals |
CB IEC62368-1 and IEC60335-1/2-29; Dekra BS EN/EN62368-1 and BS EN/EN60335-1/2-29; UL62368-1; EAC TP TC 004. |
| Withstand voltage |
Input/output: 3 kVAC; input/FG: 2 kVAC; output/FG: 0.5 kVAC. |
| Insulation resistance |
100 MΩ at 500 VDC, 25°C and 70% RH, for input/output, input/FG and output/FG. |
| MTBF reference |
883.5 thousand hours minimum, Telcordia SR-332; 95.7 thousand hours minimum, MIL-HDBK-217F at 25°C. |
Conducted emissions: BS EN/EN55032 (CISPR32) and BS EN/EN55014-1 Class B. Radiated Class B requires an additional 13 × 26 × 30 NiZn magnetic clasp or ring on the output line; without it, the radiated rating is Class A. Harmonic current: BS EN/EN61000-3-2 Class A; voltage flicker: BS EN/EN61000-3-3.
Immunity: BS EN/EN61000-4-2, ESD 8 kV air Level 3 and 4 kV contact Level 2; -4-3, radiated 3 V/m Level 2; -4-4, burst 1 kV Level 2; -4-5, surge 1 kV line-to-line Level 2 and 2 kV line-to-earth Level 3; -4-6, conducted 3 Vrms Level 2; -4-8, magnetic field 1 A/m Level 1. -4-11 voltage dips: >95% for 0.5 periods and 30% for 25 periods; interruptions: >95% for 250 periods.
The unit is a component for installation in final equipment; reconfirm EMC compliance of the complete assembly. The catalogue lists a three-year manufacturer warranty, subject to the applicable manufacturer terms.
Dimensions, connections and accessories
| Unit dimensions |
230 × 158 × 67 mm (L × W × H); case 285A. |
| Weight reference |
1840 g, catalogue PACKING reference per unit (1.84 kg); not a measured shipping weight. |
| Carton reference |
4 units / 9 kg / 1.63 CUFT; not used to calculate per-unit mass. |
| Included mode-selection jumper |
1FF1HMJ20-020-95BS or equivalent, quantity 1; for CN71 pins 3 and 4. |
| Optional handle kit |
Carry Handle, ordered separately: one handle, four foot pads and two screws. |
Connect the marked V+ and V− output terminals with the correct polarity. The AC-input end carries the input connector, switch and fan; preserve the protective-earth connection and follow the complete installation drawing.
The mechanical drawing uses millimetres with ±1 mm general tolerance. It marks 145 mm between the longitudinal mounting-slot locations, 42.5 mm from the right location to the end, 7 mm slot width, 144 mm between the top handle-hole centres and 19.5 mm output-terminal projection. Use the complete drawing for the remaining mounting coordinates and clearances. Its airflow arrow points toward the AC-input/fan end.
The Carry Handle drawing places the handle on top and four foot pads underneath, using two M4 screws. The charger and handle kit are ordered separately. The included mode jumper is distinct from the full mating housing and contacts for other control wiring; confirm the required wire assembly when ordering.
Unless separately stated, parameters are measured at 230 VAC input, rated load and 25°C ambient. Follow the MEAN WELL installation manual and the battery manufacturer requirements.
