DC-DC Battery Chargers
Battery-to-battery chargers that turn alternator or traction-pack voltage into a precise LiFePO4 / lithium-ion charging curve.
- 8–90V in
- 12.6–43.8V out
- RS485 option
Since 2015 · Shenzhen Factory
DC-DC Converter & LiFePO4 Charger Manufacturer
Buck, boost, buck-boost and isolated power modules from 5V to 90V — built for OEM volume.
Explore Products0+
Standard power models
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Countries served
ISO 9001
Quality management · CE / RoHS
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Typical MOQ for samples
Product Portfolio
Six Core Power Conversion Families
Every series is designed, assembled and tested in our Shenzhen facility. Pick the topology that matches your input range, isolation needs and load profile.
AC-DC Battery Chargers
Waterproof mains chargers for LiFePO4 packs with US / EU / UK / AU plug options, from 300W portable to 1000W fleet units.
- 90–265V AC
- 14.6–58.4V
- IP65 models
DC-DC Isolated Converters
Transformer-isolated modules that break ground loops and protect sensitive loads in telecom, forklifts and industrial control.
- 18–90V in
- 5 / 12 / 24V out
- Up to 120W
DC-DC Boost Converters
Step-up converters that raise 12V or 24V systems to 15–48V for motors, LED lighting, solar loads and 48V accessories.
- 12V → 24/36/48V
- 24V → 48V
- Up to 50A
DC-DC Buck-Boost Converters
Automatic step-up/step-down stabilizers that hold a fixed output while battery voltage swings above and below it.
- 5–60V in
- 12–48V out
- Up to 1500W
DC-DC Buck Converters
High-efficiency step-down regulators for trucks, buses, e-mobility and 48–72V battery systems feeding 5–24V electronics.
- 24/48/72V in
- 5–24V out
- Up to 100A
DC-DC Battery Chargers
Charge LiFePO4 House Batteries from Any DC Source
Direct alternator-to-lithium connections overload alternators and undercharge LiFePO4 cells. Our battery-to-battery chargers regulate input from 8V to 90V and deliver a controlled CC/CV profile tuned to your chemistry.
Input range8–36V / 10–44V / 18–90V
Charge voltage12.6 · 14.6 · 16.8 · 29.2 · 43.8V
Charge current8A – 20A+ per unit
InterfaceRS485 on WG-12C800M series
- Waterproof sealed housings for engine bays, battery boxes and outdoor mounting
- Boost and buck charging in one unit — charges 24V/48V packs from 12V systems and vice-versa
- Typical uses: RV dual-battery systems, e-bikes & e-scooters, EV auxiliaries, boats
AC-DC Battery Chargers
All AC-DC Chargers Waterproof LiFePO4 & Lithium Chargers
Mains-powered chargers for 12V, 24V, 36V and 48V lithium packs — from compact 300W marine units to the 1000W IP65 fleet charger with 90–265V universal input.
300W Marine Lithium Charger
- Output14.6 / 29.2 / 43.8 / 58.4V
- PlugsUS / EU / UK / AU
- Power300W
Buck-Boost Converters
All Buck-Boost Models Buck-Boost Voltage Stabilizers
Hold a rock-steady 12V, 13.8V, 19V, 24V or 28V output while the source battery sags under cranking or rises during charging — no brown-outs, no over-voltage.
Isolated DC-DC Converters
All Isolated Models Galvanic Isolation for Telecom & Industrial Systems
Our longest-running engineering specialty. Transformer-isolated modules separate input and output grounds — essential for 48V telecom, forklifts, golf carts and noise-sensitive control electronics.
Step-Down & Step-Up
Buck & Boost DC-DC Converters
Non-isolated converters with high conversion efficiency for fixed-ratio jobs — 24V trucks to 12V accessories, 48–72V traction packs to 12/24V, or 12V batteries up to 48V.
24V to 12V 85A/100A Truck Converter
- TypeBuck (step-down)
- Output12V · 85–100A
- CertsCE · RoHS
12V to 24V/48V High-Current Boost
- TypeBoost (step-up)
- Output24V 50A / 48V 20A
- ForBoats · solar · LED
12V to 48V Waterproof Boost
- TypeBoost (step-up)
- Output48V · 12.5–20A
- HousingPotted, waterproof
Quick Voltage Selector
Find Your Conversion Ratio in Seconds
The most-requested input → output pairs we ship to OEMs and distributors. Not listed? We regularly build custom voltages on existing platforms.
| Topology | Input | Standard outputs | Typical application | Series |
|---|---|---|---|---|
| BUCK | 12V / 24V | 5V6V | USB power, cameras, 6V legacy equipment | View → |
| BUCK | 24V | 12V13.8V | Trucks, buses, 12V radios & fridges in 24V vehicles | View → |
| BUCK | 36V / 48V / 60V / 72V | 12V13.8V24V | Golf carts, e-bikes, forklifts, 48V solar banks | View → |
| BOOST | 12V | 15V19V24V28V36V48V | Laptops, motors, LED arrays, 48V accessories | View → |
| BOOST | 24V | 48V | 48V equipment on 24V trucks and boats | View → |
| BUCK-BOOST | 5–36V / 8–40V | 12V13.8V | Car voltage stabilizers, marine electronics | View → |
| BUCK-BOOST | 9–40V / 10–60V | 19V24V28V36V48V | Solar PV loads, mixed 12/24V fleets, telecom | View → |
| ISOLATED | 18–36V / 36–75V / 18–90V | 5V12V24V | Telecom, industrial control, forklift electronics | View → |
Engineer's Selection Guide
Buck, Boost, Buck-Boost or Isolated?
Choosing the wrong topology is the most common cause of field failures we see in returned units. Use these rules from our application engineers.
Buck (Step-Down)
Vin,min > Vout + headroom
Best efficiency and cost when input always stays above output — e.g. a 24V truck system (≈22–29V) feeding 12V loads.
Boost (Step-Up)
Vin,max < Vout
Raises a lower battery to a higher bus, such as 12V to 48V for motors or LED arrays. Size for the lowest input — that is where input current peaks.
Buck-Boost
Vin crosses Vout
A 12V lead-acid or LiFePO4 bank swings ~9–14.6V. If your load needs a true 12V, only buck-boost keeps it regulated across that whole window.
Isolated
Separate grounds required
Use where input and output must not share a ground: positive-ground telecom, traction packs, noise-sensitive sensors or safety-critical systems.
Sizing tips from our test bench
- Derate continuous load 20–30% below nameplate for enclosed or hot installations.
- Account for motor and compressor inrush — peak current can be 3–6× running current.
- Calculate input current at minimum input voltage to size cables and fuses correctly.
- For LiFePO4 charging, confirm absorption voltage (14.6V per 12V pack) with your BMS supplier.
Applications
Powering Mobile, Marine & Industrial Equipment
RV & Overlanding
DC-DC battery chargers and buck-boost stabilizers for dual-battery campers and 12V appliances.
Marine & Yachts
Waterproof LiFePO4 chargers and 24V→12V converters for navigation and house loads.
Solar & Wind Off-Grid
Wide-input buck-boost modules that hold stable rails from fluctuating renewable storage.
E-Mobility & Golf Carts
48–72V to 12V/24V step-down converters for lights, horns and controllers on traction packs.
Telecom & Base Stations
Isolated 36–75V input converters for 48V telecom racks and network equipment.
Industrial & Robotics
Reliable DC rails for automation, AGVs, forklifts, medical carts and commercial vehicles.
2015Established 
About Eltrum
Engineered in Shenzhen, Installed in 130+ Countries
Shenzhen Eltrum Electronic Co., Ltd. designs and manufactures DC-DC converters, battery charging systems, AC-DC power supplies and high-voltage power modules. Our catalog of 500+ models serves alternative energy, industrial automation, telecommunications, robotics, vehicles & transportation and medical equipment.
Isolated DC-DC conversion is where our engineering team built its expertise, and that know-how now runs through every buck, boost and charger series we produce. Our factory has been verified onsite, with legal status confirmed by a third-party inspection company — and we hold a simple tenet: customer first, best service.
0+Models
0+Countries
51–100Employees
3,000m²Max. factory area
CEEU
Conformity RoHSHazardous
Substances ISO 9001Quality
Management OEMDesign &
Buyer Label
Conformity RoHSHazardous
Substances ISO 9001Quality
Management OEMDesign &
Buyer Label
Factory Tour
See How Your Converters Are Built
Walk through our SMT, assembly, potting and testing areas. Our product development team works directly with OEM buyers on custom voltages, connectors and enclosures.
Main export markets include North America, South America, Eastern Europe and Southeast Asia, with long-term partners in the USA, Japan, Europe, Australia, Canada and Korea.
Factory introduction · 1 min 44 s From Drawing to Dock
Our OEM Manufacturing & QC Workflow
A transparent process so procurement teams know exactly what happens between sample approval and shipment.
Requirement Review
Input range, load profile, environment and certification needs confirmed with our engineers.
Sample & Validation
Standard or modified samples shipped for bench and in-vehicle testing, typically from 5 units.
SMT & Assembly
PCB assembly, magnetics winding and enclosure fitting in our Shenzhen facility.
Potting & Testing
Waterproof potting where specified, followed by load and burn-in testing.
Final QC & Shipping
Outgoing inspection, buyer-label packaging and FOB / EXW dispatch worldwide.
Buyer FAQ
Questions Procurement Teams Ask Us
What is the minimum order quantity for Eltrum DC-DC converters?
Most standard converter and charger models start from 5 units, which lets engineers validate samples before volume orders. Selected high-power models are available from 1–2 units, and some industrial isolated modules start at 50 units.
Do you offer OEM and ODM customization?
Yes. We provide OEM service, design service and buyer-label production — including custom input ranges, output voltage/current, connectors, housings, RS485 communication and charging curves.
Which certifications do your products carry?
Our converter and charger series are produced to CE and RoHS requirements under an ISO 9001 quality management system. Certificate copies for specific models are available on request at [email protected].
When should I choose buck-boost instead of a buck converter?
Choose buck-boost when your input can fall below and rise above the required output — for example a 12V battery that sags to 9V under load and rises to 14.6V while charging. A buck converter only regulates when input stays above output.
Can a DC-DC charger charge a LiFePO4 house battery from my alternator?
Yes. A battery-to-battery DC-DC charger regulates alternator or starter-battery input and delivers a controlled CC/CV profile (e.g. 14.6V for a 12V LiFePO4 pack), protecting both batteries in RV, truck and marine dual-battery systems.
What payment and delivery terms do you accept?
T/T, PayPal and Escrow in USD or CNY, with FOB or EXW delivery terms. Our team can advise on consolidated shipping for mixed-model orders.
Need a Custom Voltage, Current or Charging Curve?
Send your input range, target output and application. Our engineers reply with a matching model or a custom proposal.