Electric Vehicles Products

Leonics NK ER 3603 / NK ER 3605

Optimized for 36V Battery Systems

Designed for 36V battery setups, this lineup is well-suited for mid-range electric mobility, industrial trolleys, and other moderate-power applications.

Key Specifications

Operating Input Voltage: 230 Vac (Range: 170–300 Vac)

Maximum Input Current: 2 A (NK ER 3603) / 3 A (NK ER 3605)

Frequency: 50 Hz (47–63 Hz for extended range)

Inrush Current: < 8 A

Charging Voltage: 42.4 V*

Charging Current: 3 A (NK ER 2403) / 5 A (NK ER 2405)

Ripple & Noise: Max 500 mV

Output Power: 130 W / 214 W

Stage 1 (Boost Mode): Up to 80% charge with constant current

Stage 2 (Absorption): Constant voltage until 100% capacity

Stage 3 (Float): Maintains full charge

LEDs for Power On (Blue), Charging (Amber), Charge Complete (Green)

Input Over-/Under-Voltage Cut-off at 300 Vac ±15 Vac / 170 Vac ±15 Vac

Output Over-Voltage: 42.6 V, Overload: 3.5 A / 5.5 A, Short-Circuit & Battery Reverse

Operating Temperature: 0–50 °C

Storage Temperature: –20 to 70 °C

Cooling Method: Fan-cooling

Efficiency: ~80% at full load


General Product Advantages


Multi-Stage Charging: Boost, Absorption, Float, and (in some models) Re-Charge stages prevent battery damage, enhance performance, and prolong battery life.

Robust Protection: Comprehensive safety features safeguard against over-voltage, under-voltage, overload, short-circuit, and reverse polarity.

High Efficiency: Up to 80–85% efficiency at full load, reducing power losses.

User-Friendly LED Indicators: Real-time feedback on charging progress and fault conditions.

Wide Input Voltage Range: Supports stable operation even in areas with fluctuating grid supply.

Rugged Design: Durable enclosures and fan-cooling support usage in demanding industrial or outdoor environments.