The MEAN WELL NPP-1200-24 combines a three-stage lead-acid battery charger and a selectable DC power supply in one fan-cooled enclosure. Default charging settings are 28.8 V boost, 27.6 V float and 36 A constant current. The catalogue maximum output power is 1209.6 W, subject to the voltage, current, input and temperature limits below. The 24 V model suffix identifies the voltage class rather than the actual charging voltage.
Product Datasheet
Download MEAN WELL NPP-1200 Datasheet (PDF)
The NPP-1200 section is on PDF pages 19, 20, 21, 22, 23, 24, 25, 26, 27. Refer to the complete mechanical drawings and notes when planning installation.
Battery Charger Output
Complete model
NPP-1200-24
Nominal voltage class
24 V
Default boost charge voltage
28.8 V
Default float charge voltage
27.6 V
Maximum output current
36 A
Maximum output power
1209.6 W
Default constant-current setting
36 A
Output voltage adjustment range
21–42 V
Current adjustment range
18–36 A
Recommended battery capacity
120–420 Ah
Three-stage charging is the factory operating mode. Supported battery types are flooded, gel and AGM lead-acid. Confirm the battery manufacturer’s charging-voltage and maximum-current requirements; battery-specific settings or specification changes may be necessary.
The built-in potentiometer adjusts float voltage in charger mode. The panel provides Vo Adj and Io Adj controls; current adjustment is 50–100% within the stated 18–36 A range. Do not treat the model suffix as the battery’s charging voltage or assume full current throughout the entire voltage range.
Maximum output power is a separate limit, not the product of the default boost voltage and CC setting. Output voltage multiplied by output current must not exceed the rated power.
Selectable Power Supply Mode
Default DC output voltage
28.8 V
Rated output current
36 A
Rated output power
1209.6 W
PSU voltage adjustment
21–42 V by built-in potentiometer
PSU current adjustment
18–36 A
Ripple and noise, maximum
300 mVp-p
Voltage tolerance
±1%
Line regulation
±0.5%
Load regulation
±1%
Setup / rise time
1800 ms / 60 ms at 230 VAC, full load
Typical hold-up time
16 ms at 230 VAC, 75% load; 10 ms at 230 VAC, full load
CN71 pins 3 and 4 select the operating mode: leave them open for battery charging (factory default), or connect the supplied mode jumper for power supply operation. These are two functions of the same complete model. In PSU mode, set the output voltage and current for the connected load and observe all derating and power limits.
Three-Stage Charging and Indicators
Stage 1
Constant current: 100% of the CC setting while battery voltage rises
Stage 2
Constant voltage at Vboost while charging current tapers
Stage 3
Float at Vfloat after current reaches 10% of the CC setting
Charger indicator
Red during CC/CV charging; green at float / full charge; no light indicates abnormal status
PSU indicator
Green during normal power supply operation; no light indicates abnormal status
The transition point shown in the charging curve is 10% of CC. Select settings suitable for the specific battery; this unit’s stated charging function is three-stage operation.
Input and Efficiency
AC input
90–264 VAC
DC input
127–370 VDC
Input frequency
47–63 Hz
Typical AC current
12 A at 115 VAC; 6.5 A at 230 VAC
Typical power factor
>0.98 at 115 VAC; >0.95 at 230 VAC, full load
Typical cold-start inrush
50 A at 230 VAC
Typical efficiency
93%
Unless otherwise stated, specifications use 230 VAC input, rated load and 25°C ambient temperature. The charging-efficiency test uses 33.6 V output for this model. Active inrush-current limiting and PFC are shown in the block diagram, with PFC and PWM switching frequencies of 80 kHz and 60 kHz.
Cooling and Derating
Cooling
Built-in DC fan controlled by internal temperature
Horizontal temperature curve
Full power through +50°C; derate to 50% at +70°C
Low-temperature condition
−30 to −25°C operation is specified for 230 VAC input only
Low-line current limit
80% output current from 90 VAC to below 180 VAC; 100% from 180 to 264 VAC, at 60 Hz
Output-voltage current limit
100% current up to 33.6 V; 80% above that point through 42 V
Apply the output-voltage/current, AC-input/current and ambient-temperature/power limits together. Full output is not available at every combination of input voltage, output setting and ambient temperature. The AC curve does not establish an additional DC-input derating curve.
For this fan-cooled unit above 2000 m, reduce the permissible ambient temperature by 5°C per additional 1000 m. Keep both the fan opening and airflow path clear. The altitude derating note does not specify an unlimited maximum operating altitude.
Protection
Charger short circuit
Constant-current limiting, followed by shutdown after 5 seconds; re-power to recover.
PSU overload
105–115% of rated output power; constant-current limiting, then shutdown after 5 seconds; re-power to recover
PSU short circuit
Constant-current limiting, followed by shutdown after 5 seconds; re-power to recover.
Overvoltage
43–52 V; shutdown and latch-off; re-power to recover
Overtemperature
Output shutdown; automatic recovery after temperature falls
The charger short-circuit protection specification applies when the short circuit occurs after the charger has been turned on. Remove the fault before restoring power.
Control Connector and Mating Parts
CN71 header
HRS DF11-14DP-2DS or equivalent
Mating housing
HRS DF11-14DS or equivalent
Contact family
HRS DF11-**SC or equivalent
Pins 1, 2 and 11–14
NC
Pins 3 and 4
Open: charger mode; short: power supply mode
Pin 5
Battery Full signal
Pin 6
Charger OK / DC OK signal
Pin 7
Remote ON-OFF
Pin 8
+12V-AUX
Pins 9 and 10
GND-AUX
The DF11-**SC entry is a contact family with an unspecified suffix, not a complete contact ordering reference. Select the correct contact for the wire assembly. Use the connector orientation and pin numbering shown in the drawing.
GND-AUX is the signal return isolated from the output terminals +V and −V. The +12V-AUX function is controlled by Remote ON-OFF; use it within the specified control arrangement.
Remote Control and TTL Signals
Remote ON-OFF uses a dry contact between pin 7 and pin 8: shorted is ON (default), with pin 7 at 10.8–13.2 V; open is OFF, with pin 7 at −0.5 to +0.5 V. The maximum input voltage is 13.2 V. In charger mode this enables or stops charging; in PSU mode it switches the output on or off.
Pin 5 Battery Full is an output-only TTL signal referenced to GND-AUX pins 9/10, with a maximum sourcing current of 10 mA. Low, −0.5 to +0.5 V, means charging; high, 4.5–5.5 V, means the battery is full.
Pin 6 Charger OK / DC OK is also output-only TTL, referenced to GND-AUX pins 9/10, with a maximum sourcing current of 10 mA. High, 4.5–5.5 V, indicates normal operation; low, −0.5 to +0.5 V, indicates failure or an active protection function.
Mechanical Installation and Accessories
Dimensions, L × W × H
250 × 158 × 67 mm
Case drawing
285B; dimensions in mm, general tolerance ±1 mm
Catalogue unit weight
1930 g; packing reference per unit, not a measured net or shipping weight
Output-terminal projection
17 mm as marked in the drawing
Supplied mode jumper
1FF1HMJ20-020-95BS or equivalent; one piece for CN71 pins 3 and 4
Optional accessory
Carry Handle; order the unit and handle separately
The flange-slot centres are 155 mm apart along the length; the indicated right-hand slot is 47.5 mm from the body edge. The top drawing marks 144 mm between handle attachment positions. The front view places +V on the left and −V on the right, 36 mm apart. The −V terminal centre is 45 mm from the indicated right edge. The drawing shows 138 mm inner body width within 158 mm overall width.
The output-terminal centre height is marked 18.6 mm. The rear drawing shows the AC inlet, power switch and fan; its airflow arrow points toward the rear AC side. Follow the front-view +V and −V markings when wiring the output.
The optional Carry Handle kit drawing lists one handle, four foot pads and two screws. Install them at the depicted positions; the screw marking is M4*2. The handle is a separately ordered accessory, not part of the charger’s stated standard mode-jumper supply.
Environment and Reliability
Operating ambient
−30 to +70°C, subject to the stated input and derating conditions
Operating humidity
20–95% RH, non-condensing
Storage
−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
Minimum calculated MTBF
625.1 thousand hours, Telcordia SR-332; 63.6 thousand hours, MIL-HDBK-217F at 25°C
Manufacturer warranty
3 years
Application examples include radio-system backup, lead-acid scooter charging, camping cars, buses, heavy-duty and specialty vehicles, surveillance, industrial automation and mechanical or electrical equipment. Check the load, battery and installation conditions for the intended application.
Safety, Insulation and EMC
Dielectric withstand
Input/output: 3 kVAC; input/FG: 2 kVAC; output/FG: 0.5 kVAC
Insulation resistance
100 MΩ between input/output, input/FG and output/FG, at 500 VDC, 25°C and 70% RH
Conducted / radiated emissions
BS EN/EN 55032 (CISPR32): Class B conducted / Class A radiated
Harmonic current / voltage flicker
BS EN/EN 61000-3-2 Class A / BS EN/EN 61000-3-3
The catalogue lists 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 approvals. These component approvals do not by themselves certify the complete equipment.
Immunity references BS EN/EN 61000-4-2 through -4-6, -4-8 and -4-11: ESD 8 kV air / 4 kV contact; radiated RF 3 V/m; EFT/burst 1 kV; surge 1 kV line-to-line / 2 kV line-to-earth; conducted RF 3 Vrms; magnetic field 1 A/m. Voltage dips are >95% for 0.5 period and 30% for 25 periods; interruptions are >95% for 250 periods.
The EMC test arrangement mounts the unit on a 600 × 900 mm metal plate, 1 mm thick. Final equipment must be checked for continued EMC compliance.
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