MEAN WELL NPP-450-72 combines a three-stage lead-acid battery charger and a constant-voltage AC/DC power supply in one NPP-450 unit. Default charging settings are 72 V boost, 69 V float and 5.5 A constant current. Charger maximum output is 462 W; power-supply mode is rated 462 W. Both modes are subject to voltage, input and temperature limits.
Product Datasheet
Download MEAN WELL NPP-450 Datasheet (PDF)
The NPP-450 section is on PDF pages 1, 2, 3, 4, 5, 6, 7, 8, 9. Refer to the complete mechanical drawings and notes when planning installation.
Default Battery-Charger Output
| Full model |
NPP-450-72; NPP-450 series, 72 V model code. |
| Default boost charge voltage |
72 V. |
| Default float charge voltage |
69 V. |
| Maximum output current |
5.5 A; factory charging-curve CC setting. |
| Maximum output power |
462 W in charger mode, subject to all derating limits. |
| Voltage adjustment |
54–100 V through the front Vo Adj. potentiometer; the charger specification identifies the adjustable quantity as Vfloat. |
| Current adjustment |
2.75–5.5 A (50–100%) through the front Io Adj. potentiometer. |
| Suggested battery capacity |
19–64 Ah; confirm the battery manufacturer's maximum charging current and charging requirements. |
The model code identifies the nominal voltage class; use the actual boost and float settings when selecting a battery. This model supports lead-acid flooded, gel and AGM batteries.
One unit provides both operating modes. Leave CN71 pins 3 and 4 open for the default battery-charger mode; connect the supplied mode jumper between pins 3 and 4 for constant-voltage power-supply mode.
Power-Supply Mode
| DC output voltage |
72 V at the catalogue setting. |
| Rated output current |
5.5 A; the voltage-dependent current limit also applies. |
| Rated output power |
462 W in power-supply mode. |
| Voltage / current adjustment |
54–100 V and 2.75–5.5 A through the front potentiometers. |
| Ripple and noise |
600 mVp-p maximum. |
| Voltage tolerance |
±1.0%. |
| Line / load regulation |
±0.5% / ±0.5%. |
| Set-up / rise time |
1800 / 60 ms at 230 VAC, full load. |
| Typical hold-up time |
16 ms at 230 VAC and 75% load; 10 ms at 230 VAC and full load. |
Charging Sequence and Output Limits
| Three-stage charging |
Constant current at 5.5 A, constant voltage at 72 V, then float at 69 V. The curve marks transition to float at 10% of CC. |
| Charger indicator |
Red during stages 1 and 2; green during stage 3 float or when fully charged; no light indicates an abnormal state. |
| Power-supply indicator |
Green for normal operation; no light indicates an abnormal state. |
| Voltage-dependent current |
The curve permits 100% current up to 84 V, then limits current to 80% (4.4 A) above that knee through 100 V. |
Output voltage multiplied by output current must remain within the applicable mode's power rating. Voltage, input-voltage and temperature limits apply together; adjustment to a higher voltage does not increase available power.
Input and Protection
| Input voltage / frequency |
90–264 VAC or 127–370 VDC; 47–63 Hz for AC input. |
| Input connection |
AC inlet and ON/OFF switch on the fan end; provide the protective-earth connection shown in the installation drawing. |
| PFC and inrush control |
Active PFC and active inrush-current limiting. Typical power factor >0.98 at 115 VAC and >0.95 at 230 VAC, full load. |
| Typical input current / inrush |
4.5 A at 115 VAC; 2.2 A at 230 VAC. Cold-start inrush is typically 50 A at 230 VAC. |
| Typical efficiency |
93%, measured at 84 V charging voltage with the stated catalogue test conditions. |
| Short-circuit protection |
Constant-current limiting; shutdown after 5 seconds, then re-power to recover. The specified short-circuit behaviour applies after turn-on. |
| Power-supply overload protection |
105–115% of rated output power; constant-current limiting followed by shutdown after 5 seconds. Re-power to recover. |
| Overvoltage protection |
102–120 V; output shuts down and latches off. Re-power to recover. |
| Overtemperature protection |
Output shuts down and recovers automatically after temperature falls. |
Unless otherwise stated, catalogue measurements use 230 VAC input, rated load and 25°C ambient. The block diagram specifies an 80 kHz PFC oscillator and 60 kHz PWM oscillator.
Remote Control and Status Signals
CN71 pins 7 (Remote ON-OFF) and 8 (+12V-AUX) accept a dry-contact connection. Short them for ON, the factory default; pin 7 is then 10.8–13.2 V. Open them for OFF; pin 7 is then −0.5–0.5 V. The maximum remote-control input voltage is 13.2 V.
Pin 6 is Charger OK in charger mode and DC OK in power-supply mode. Its TTL output is high at 4.5–5.5 V during normal operation and low at −0.5–0.5 V during failure or protection activation.
Pin 5 is the Battery Full TTL output: low at −0.5–0.5 V while charging and high at 4.5–5.5 V when full. Both status outputs source a maximum of 10 mA and are output signals only.
Status and remote-control signals reference GND-AUX on pins 9 and 10, which is isolated from the main +V and −V terminals. Pin 8's auxiliary output is controlled by Remote ON-OFF.
Temperature, Cooling and Installation
| Operating temperature |
−30 to +70°C, subject to the horizontal-mounting derating curve. |
| Horizontal thermal curve |
100% power through 50°C, falling to 50% at 70°C. The −30 to −25°C region is specified for 230 VAC input only. |
| Input-voltage derating |
At 60 Hz, the current curve permits 90% at 90 VAC and 100% from 100 to 264 VAC. |
| Cooling |
Thermally controlled DC fan with speed adjusted by internal temperature; drawing airflow is towards the AC inlet/fan end. |
| Humidity / storage |
Operating 20–95% RH, non-condensing. Storage −40 to +85°C and 10–95% RH, non-condensing. |
| Temperature coefficient |
±0.05%/°C from 0 to 50°C. |
| Vibration |
10–500 Hz, 2 G, 10-minute cycle; 60 minutes each along X, Y and Z. |
| Dimensions / case |
205 × 135 × 55 mm (L × W × H); case 284A. Drawing tolerance is ±1 mm. |
| Mounting drawing |
5.5 mm mounting-slot width, 127 mm longitudinal and 110 mm transverse mounting spacing; handle fixing-hole spacing 144 mm. Use the complete drawing for mounting coordinates. |
| Unit weight |
1380 g (1.38 kg), excluding the separately ordered handle kit. |
Keep ventilation paths clear and use the installation orientation shown. Above 2000 m, the catalogue requires reducing the permissible ambient temperature by 5°C per additional 1000 m for fan-cooled models.
Terminals, Mating Parts and Accessories
| DC output |
Two screw terminals marked V+ and V− on the front panel. |
| CN71 pins 1, 2 and 11–14 |
NC; no connection. |
| CN71 pins 3 and 4 |
Operating-mode selection: open for charger mode; short for power-supply mode. |
| CN71 pins 5 / 6 |
Battery Full / Charger OK or DC OK. |
| CN71 pins 7 / 8 |
Remote ON-OFF / +12V-AUX. |
| CN71 pins 9 and 10 |
GND-AUX, isolated signal return. |
| Control connector |
HRS DF11-14DP-2DS or equivalent; mating housing HRS DF11-14DS or equivalent. |
| Mating contacts |
HRS DF11-**SC or equivalent is the printed contact-family reference. Select the complete compatible contact reference for the chosen housing and wire. |
| Included mode jumper |
One mating jumper for pins 3 and 4, reference 1FF1HMJ20-020-95BS or equivalent, is listed as a standard accessory. |
| Optional carrying accessory |
Order No. Carry Handle; ordered separately from the charger. The kit lists 1 handle, 4 foot pads and 2 screws; the assembly drawing identifies two M4 screws. |
The control-connector references identify compatible mating parts; the catalogue specifically identifies the mode jumper as included and the carry-handle kit as separately ordered.
Safety, EMC and Reliability
Catalogue-listed approvals are CB IEC 62368-1 and IEC 60335-1/-2-29; DEKRA BS EN/EN 62368-1 and BS EN/EN 60335-1/-2-29; UL 62368-1; and EAC TP TC 004. The final installation must meet its applicable equipment requirements.
Withstand voltage is 3 kVAC input-to-output, 2 kVAC input-to-FG and 0.5 kVAC output-to-FG. Insulation resistance is 100 MΩ at 500 VDC, 25°C and 70% RH for those three pairs.
Conducted and radiated emissions: BS EN/EN 55032 (CISPR 32) and BS EN/EN 55014-1, Class B. Harmonic current: BS EN/EN 61000-3-2 Class A; flicker: BS EN/EN 61000-3-3. Industrial immunity is listed to BS EN/EN 61000-6-2.
Immunity test levels include ESD 8 kV air/4 kV contact, radiated RF 3 V/m, EFT 1 kV, surge 1 kV line-to-line/2 kV line-to-earth, conducted RF 3 Vrms and magnetic field 1 A/m. Voltage-dip tests are >95% for 0.5 period and 30% for 25 periods; interruption is >95% for 250 periods.
EMC testing uses the independent unit on a 600 × 900 × 1 mm metal plate; final equipment must reconfirm EMC. Minimum MTBF is 1056.9 thousand hours by Telcordia SR-332 or 118.5 thousand hours by MIL-HDBK-217F at 25°C. The catalogue states a three-year warranty.
