7.5 kW battery-charger - Electrowaves Electronics

7.5kW constant voltage charger built for narrow gauge SLR coaches with 110V, 300Ah VRLA batteries.

Provides regulated DC power to coach loads while ensuring efficient battery charging.

Features current limiting for safe and reliable operation under varying load conditions.

Underslung, naturally cooled design ensures durability and space-efficient integration in railways

Type
Charger Type	Constant Voltage
Input Voltage
Nominal Voltage	415 V AC, 3-phase, 3-wire system
Operating Range	415 V ±15%, 50 Hz ±3%
THD (Max)	Voltage < 10%
Output (DC)
Type	Fully insulated from coach body (+ and – sides)
Output Voltage	122 V ±2% DC
Output Current	60 A max
Battery Type & Rating	110 V, 300 Ah VRLA
Efficiency	Greater than 97% at full load
Ripple Content	<2% of set Voltage, <3% of set Current
Protections
O/P Over Voltage	136 VDC ±2 V
Output Current Limit	60 A max
AC O/V & U/V Protection	Trips at 300 ±5 V / 480 ±5 V; auto-restart; withstands 510 V AC for 2 min
Self-reset Feature	Auto restart if trip condition normalizes
Earth Leakage	Trip provided for >≈30 mA on +ve/−ve lines
IP Protection	IP-67 (dust and water ingress protection)
Short Circuit	Trip provided
Reverse Polarity	Protection in battery circuits
Overload	22 A for 1 minute
Isolation	Galvanic isolation provided
Construction
Enclosure	2 mm thick SS-304/S2 or SS-304/L
Dimensions	L: 700 mm, W: 407 mm, H: 470 mm
Mounting	660 × 240 mm
Weight	< 150 kg

7.5 KW Battery Charger For Narrow Gauge Coaches