Battery charger for marine applications VT-QA300A

for electric vehiclesfor forklift trucksfor AGV

Overview
This sealed-structure industrial charger (model VT-QA300A, 300W) supports flooded lead-acid, sealed lead-acid, Li‑ion, Ni‑MH and Ni‑Cd batteries. It is designed for cycle and float charging of battery packs used in electric vehicles, material handling equipment and maritime systems.

Key specifications

• AC input: 100–240VAC, 45–65Hz
• Applicable battery voltages: 12V / 24V / 36V / 48V
• Rated power: 300W
• Charging current options: 5A / 6A / 10A / 15A
• Max efficiency: ≥89.0%
• Waterproof rating: IP65 / IP67 / IP68 (model-dependent; technical table shows IP67)
• Dimensions: 152 × 118 × 62.5 mm
• Weight: 1.3 kg (short) / 1.4 kg (technical table)
• Operating temperature: -30°C to 65°C; Storage: -40°C to 95°C
• Noise: ≤45 dB
• Shell material: Aluminum
• Available colors: Red / Blue / Silvery (custom colors available)
• Certifications: CE, FCC, ETL
• Warranty: 2 years

Applications

• Electric bumper cars, sightseeing vehicles and patrol vehicles
• Forklifts, AGVs, floor scrubbers and other material handling equipment
• Boats and maritime battery systems
• General-purpose industrial battery packs requiring cycle or float charging

Protection functions

• Overtemperature/Burnout protection: reduces output or stops charging if temperature limits are exceeded; resumes after cooling
• Reverse polarity protection: internal circuit shuts down on reverse battery connection
• No-load protection: no output when battery disconnected
• Short-circuit protection: automatic shutdown; restart after fault clearance and restart
• Automatic cutoff: charger stops charging when battery is detected fully charged

Technical parameters (general)

• Model: VT-QA300A
• AC input current (max): 2A @ 220VAC
• Max output voltages per model: e.g. 17V (12V model), 34V (24V), 48V (36V), 66V (48V)
• Transition / cut-off currents and CV settings vary by battery chemistry (see model variants)
• Noise: ≤45dB; Max efficiency ≥89.0%

Model variants (QA300A series)

• QA300A-12V15A — Rated 12V, Max output 17V, Max current 15A, CV: 14.7V (Lead‑acid) / 12.6V (Li‑ion) / 14.6V (LiFePO4), cutoff ~1.5A
• QA300A-24V10A — Rated 24V, Max output 34V, Max current 10A, CV: 29.4V (Lead‑acid/Li‑ion) / 29.2V (LiFePO4), cutoff ~1.0A
• QA300A-36V06A — Rated 36V, Max output 48V, Max current 6A, CV: 44.1V (Lead‑acid) / 42.0V (Li‑ion) / 43.8V (LiFePO4), cutoff ~1.0A
• QA300A-48V05A — Rated 48V, Max output 66V, Max current 5A, CV: 58.8V (Lead‑acid) / 54.6V (Li‑ion) / 58.4V (LiFePO4), cutoff ~1.0A

Series & additional ranges

• Other QA series: 450W (QA450A examples), 600W (QA600A), 750W (QA750A) and larger 1250W–3000W models for higher-power needs
• Larger models may use input 180–240VAC and offer CAN communication and additional options