OEM / ODM Manufacturing
QA750A Series — 750W Waterproof Marine Battery Charger
Industrial-grade design engineered for reliable, long-term performance — supplied through qualified manufacturing with OEM / ODM customization, export-ready packaging and worldwide delivery.
Custom VoltageCustom Charging ProfileOEM & ODMWaterproof OptionsCommunication OptionsCertifications
Talk to our engineering team for OEM / ODM projects and volume pricing.
A 750W LiFePO4 marine charger with selectable current for 12V–48V systems.
- Charging current 15A / 18A / 25A for battery banks from 80–200AH
- Waterproof to IP65 / IP67 / IP68 in a 195 × 122 × 71 mm case (1.9 kg)
- 100–240VAC input · DC 12 / 24 / 36 / 48V · 2-year warranty
Key Specifications
Key parameters for this model. Values are maintained per product and update automatically.
| Model | VT-QA750A |
|---|---|
| Battery Voltage | 24V, 36V, 48V, 60V, 72V |
| Rated Out Power | 750W |
| Input Volt | 220VAC, 110VAC |
| IP Rating | IP67 |
Built for These Applications
Tell us the application and we match the charging profile, interface and enclosure to it.
Battery Brands
Charging platforms for your own label and voltage range.
Golf Carts
Fleet and OEM charging for 36V / 48V / 72V packs.
RV & Marine
Waterproof and ignition-safe charging for mobile installations.
Industrial Vehicles
Forklift, AGV and floor-machine duty cycles.
Telecom & Backup
Rectifier and battery-bank charging for site power.
Solar & Off-grid
Charging from renewable and generator sources.
Configure It Around Your Battery
OEM / ODM customization is available on this platform. Send your battery specification and we propose the configuration.
Charging Profile
Voltage, current and CC/CV stages set to your pack.
Connector
Connector type and pin-out to your existing harness.
Cable & Length
Cable gauge and length for your installation.
Branding
Custom Branding on label, housing and packaging.
Packaging
Retail or export-ready packaging and inserts.
Charging Compatibility
Charging voltage is set per chemistry. The exact chemistry and voltage range of this model are listed in Key Specifications above.
| Battery chemistry | Typical charging voltage | Notes |
|---|---|---|
| LiFePO4 | 3.5 – 3.65 V per cell | CC / CV, balance-friendly |
| Lithium (Li-ion) | 4.1 – 4.2 V per cell | CC / CV with charge termination |
| Lead-Acid / AGM / GEL | 2.40 – 2.45 V per cell | Multi-stage with float |
| Flooded | 2.40 – 2.50 V per cell | Equalization available |
Protection & Reliability
The protection set fitted to this model is listed in Key Specifications above. Reliability of the platform is covered by the items below.
Electrical Protection
Reverse connection, short circuit and no-load protection with automatic shutdown.
Thermal Protection
Over-temperature sensing with derated or stopped charging.
Environmental
Enclosure and conformal treatment options for outdoor and mobile use.
Production Testing
Unit-level functional and safety testing before shipment.
Quality System
ISO 9001 quality system with traceable production records.
Warranty
Standard warranty with defined service terms for OEM programs.
This series chargers design of sealed structure. It suitable for flooded lead- acid batteries, sealed lead acid batteries, Lithium batteries, NI-MH batteries, Nickle Cadmium batteries, etc. They ate used to cycle charge or floating charge battery pack in electric Bumper Car, sightseeing vehicles, patrol vehicles, fork lifts, Floor Scrubber, AGV, ships, etc.
Protection Function
1.Burnout Protection: Temperature of charger exceeds the limitation. The charge will low down the power load. Temperature of environment exceeds 65℃, the charger will stop charging and switch itself to standby mode until temperature of environment goes down.
2.Protection for Reverse Connection of Batteries:The circuit inside the charger shuts down with batteries when the batteries are connected reversely and will not damage the charger.
3.NO-load Protection: There is no output when the batteries are not connected.
4.Short Circuit Protection: The circuit inside the charger shuts down with batteries when output is short circuit. The charger will start charging only after troubleshooting and restart the charger.
5.Automatic shutdown when fully charging: The charging automatically turns off after the battery is fully charged according to the charger’s judgment.
Technical Parameters
| Model： | VT-QA750A | Shell: | Aluminium |
| AC input: | 185-270VAC;45-63Hz | Dimensions： | 195*122*71mm |
| Max Efficiency: | ≥92.0% | Waterproof: | IP67 |
| Max input
current: |
3.0A@220VAC | Weight: | 1.9kg |
| Noise: | ≤45dB | Operating
Temperature: |
-30℃~65°℃ |
| Available Color | Yellow/other color can be customized | Storage Temperature: | -40°C~95°C |
| Protection: | 1.Burnout Protection, 2.Protection for Reverse Connection of Batteries 3.NO-load Protection, 4.Short Circuit Protection,5.Automatic shutdown when fully charging | ||
Model List：Quickly find a model that matches your needs, please feel free to contact us！
Charging Current by Input Voltage
Charging current by battery voltage for the VT-QA750A platform.
| Battery Voltage | Current (220VAC) | Current (110VAC) |
|---|---|---|
| 24V | 25A | 25A |
| 36V | 18A | 18A |
| 48V | 15A | 15A |
| 60V | 12A | 12A |
| 72V | 10A | 10A |
Charging current is identical on 220VAC and 110VAC input for this model.
Available Models & Full Specifications
B2B FAQ
Do you support BMS communication on your chargers?
Yes. Where the model supports it, the charger can communicate with the battery BMS over CAN or RS485 so charging stops at the values your BMS expects. The interface fitted to this model is listed in Key Specifications.
Can the charging curve be adjusted to our battery?
Yes. Charging voltage, current and the CC/CV stages can be set to your pack specification as part of an OEM / ODM order. Send your battery datasheet and we confirm the profile.
Can you supply the connector we already use?
Yes. We can fit your existing connector type and pin-out, or supply a matched connector and cable assembly.
Do you offer Custom Branding?
Yes. Custom Branding is available on the product label, housing and packaging for OEM and ODM programs.
How does sample development work?
Send your specification and target quantity. We confirm the configuration, provide a sample lead time and quote, then move to production once the sample is approved.
Send Us Your Battery Specification
Share your application, technical requirements and expected quantity — our B2B team will recommend the right product or customized solution.
