Smart 36V 13A Waterproof LiFePO4 Dual Battery Charger
- TopologyBoost Charger
- Input Voltage12V DC Nominal
- Output Profile43.8V CC/CV · 13A
- EnclosureIP67 Fully Potted
Industrial Catalog
High-Efficiency Dual Battery System DC-DC Chargers & Regulators
Engineered for high-vibration automotive chassis, fluctuating commercial vehicle alternators, and secondary auxiliary banks (LiFePO4, AGM, GEL, and Lead-Acid).
400W Multi-Chemistry DC-DC Dual Battery Charger
- TopologyBuck-Boost Charger
- Input Voltage10V–36V Wide DC
- Output14.6V / 29.2V Select
- ApplicationOverland RVs & Vans
1500W Industrial Buck-Boost DC Stabilizer / Charger
- TopologyBi-Directional Buck-Boost
- Input Voltage10V–60V DC Rail
- Output12V / 24V / 48V Programmable
- TelemetryRS485 Modbus RTU
10–44V to 12V 50A/60A Fleet Voltage Stabilizer
- TopologySynchronous Buck-Boost
- Continuous Amps50A – 60A Output
- Power OutputUp to 720W Max
- ProtectionOver-Temp & Surge Foldback
8–40V to 13.8V 30A Auxiliary Battery System Charger
- TopologyAuto Step-Up / Step-Down
- Input Range8V–40V Wide Engine Bus
- Output Voltage13.8V Float / 14.6V Bulk
- Efficiency94.5% Peak
24V to 12V 100A Commercial Truck Step-Down Charger
- TopologyHigh-Current Buck
- Input Bus24V Commercial Heavy Fleet
- Output Bus12V DC · 100A Continuous
- HousingExtruded Thermal Fin Box
18–90V to 12V 10A Galvanic Isolated DC-DC Charger
- TopologyOptocoupler/Transformer Isolated
- Isolation Barrier1500V DC Galvanic
- Input Flexibility24V / 48V / 72V Traction Packs
- ApplicationEV, AGV & Ground Noise Immunity
12V to 48V 20A Step-Up Dual Battery Lithium Charger
- TopologyActive Boost Architecture
- Input System12V Engine Alternator
- Output Range48V–58.4V LiFePO4 Array
- Power960W Peak Sustained
Engineering White Paper
Bridging Smart Alternators & Lithium Auxiliaries in Modern Fleets
The transition from legacy passive Voltage Sensitive Relays (VSR) and split-charge solenoids to intelligent, microprocessor-governed DC-DC chargers is an absolute operational necessity for commercial vehicles in Southern Europe. Modern Euro 6d and upcoming Euro 7 engines utilize intelligent, ECU-controlled alternators engineered strictly for fuel economy and immediate emissions reductions rather than deep auxiliary battery maintenance.
These alternators systematically vary output between 11.8V during rapid acceleration and up to 15.4V during regenerative coasting. When paired directly with low internal resistance secondary chemistries—such as Lithium Iron Phosphate (LiFePO4) or high-density AGM—traditional split relays either allow destructive reverse current discharge from the house bank back into the starter network or cause extreme alternator stator overheating due to unrestricted current draw.
Shenzhen Eltrum Electronic Co., Ltd. solves this fundamental electro-mechanical friction through our proprietary 4-switch synchronous buck-boost converter topology. By integrating digital signal processing (DSP) control loops, our OEM chargers provide:
- Independent Engine-Run Detection (D+ Signal & Vibration Thresholding): Automatically senses engine ignition states without needing deep intrusive vehicle harness splicing, protecting starter cranking reserves.
- Algorithmic 3-Stage CC/CV Charging Curves: Delivers controlled Constant Current (Bulk), Constant Voltage (Absorption at 14.2V–14.6V), and Float stages (13.6V–13.8V) tailored specifically to match OEM BMS cutoff thresholds.
- Dynamic Alternator Overheat Mitigation: Continuous thermal throttle control derates output current smoothly should under-hood temperatures cross 85°C, ensuring alternators are never driven to stator burnout.
- Bi-directional Reverse Voltage & Transient Suppression: Built-in TVS diodes clamp load-dump surges conforming to ISO 7637-2 and ISO 16750-2 automotive electrical disturbance standards.
Regional Integration
Mission-Critical Zaragoza Field Application Scenarios
As the premier southwestern European dry logistics nexus, Zaragoza (PLAZA) connects the Madrid-Barcelona-Valencia-Basque industrial quadrangles. Our dual battery systems are engineered to thrive in Aragon's harsh operational realities.
PLAZA Cold-Chain & Tail-Lift Commercial Fleets
Zaragoza's massive intermodal transit terminals house hundreds of refrigerated box vans and intercity delivery trucks. Eltrum's 24V-to-12V and 24V-to-24V 60A/100A DC-DC buck-boost converters continuously replenish dedicated tail-lift and auxiliary refrigeration datalogger battery banks during transit routes between Aragon, Catalonia, and Aquitaine. Fully potted IP68 casings resist chemical de-icing salts used along the A-2 and AP-68 motorways.
Pyrenean Overland & Camper Conversions
Aragon serves as the primary southern launchpad for alpine camper tourism through Huesca, Jaca, and the Pyrenees national parks. Van conversion specialists in Zaragoza deploy our 12V-to-12V 40A/60A multi-stage DC-DC chargers with dual inputs (Alternator + Solar PV). The integrated buck-boost stabilization guarantees that off-grid campers sustain induction cooktops, 12V compressor refrigerators, and Starlink systems regardless of low sub-zero winter temperatures.
Ebro Valley Agritech & Autonomous Equipment
The agricultural corridor along the Ebro basin heavily relies on heavy-duty tractors, harvesting robotics, and autonomous irrigation skids. Agricultural engineering OEMs integrate our 48V-to-12V and 72V-to-24V isolated DC-DC converters to step down high-voltage electric powertrain traction packs to supply delicate GPS steering receivers, telematics modems, and ISOBUS precision agricultural controllers completely isolated from motor back-EMF noise.
Parametric Comparison
OEM Dual Battery Charging Topology Architecture
A technical guide for system integrators and fleet electrical architects comparing power conversion topologies across vehicle duty cycles.
| Converter Architecture | Operating Input Range | Primary Voltage Conversions | Conversion Efficiency | Galvanic Isolation | Optimal Deployment Focus |
|---|---|---|---|---|---|
| Buck-Boost Charger (DSP Active) | 8V – 40V DC | 12V → 14.6V (LiFePO4) / 29.2V | 93% – 96% | Non-Isolated (Common Ground) | Euro 6d/7 Smart Alternator Campers, Light Commercial Vans |
| High-Current Buck Regulator | 18V – 90V DC | 24V → 12V, 48V → 12V/24V | 95% – 97.5% | Non-Isolated | Class-8 Heavy Haulers, Bus Lighting, Municipal Waste Sweepers |
| Active Boost Step-Up Charger | 9V – 32V DC | 12V → 24V, 12V → 48V / 58.4V | 92% – 95% | Non-Isolated | 48V Mild-Hybrid Auxiliary Air-Conditioning, Marine Thrusters |
| Galvanically Isolated Module | 18V – 90V (Wide 4:1) | 36V/48V/72V → 12V / 24V | 89% – 93% | 1500V DC Transformer Isolation | Electric Forklifts, Telecommunication Relays, Ground Noise Elimination |
500+
Standard Power Topologies
130+
Global Export Destinations
100%
Burn-In Load Tested
5 pcs
Flexible OEM Validation MOQ
Market Foresight
Macro Trends Transforming Iberian Mobile Power Infrastructure
Strategic technological developments driving OEM dual-battery specification choices across commercial and municipal transport sectors.
Low-Emission Zone (ZBE) Mandates in Zaragoza
With Spanish Law 7/2021 establishing compulsory Zonas de Bajas Emisiones (ZBE) for cities like Zaragoza with populations over 50,000, last-mile delivery fleets are rapidly replacing auxiliary engine-driven hydraulic pumps with lithium-battery electric power packs. High-output OEM DC-DC chargers allow these secondary packs to recharge rapidly during high-speed transit sections between industrial parks, facilitating zero-emission electric tail-lift cycling inside downtown urban boundaries.
Extreme Continental Iberian Thermal Spikes
Aragon's severe inland climate—characterized by intense summer temperatures exceeding 42°C in the central Ebro depression—renders unpotted, fan-cooled chargers prone to thermal lockup and particulate dust contamination from the prevailing Cierzo wind. Fleets increasingly specify IP68 vacuum-encapsulated polyurethane or epoxy-potted DC-DC units capable of full-rated continuous dissipation at chassis ambient operating boundaries of -40°C to +85°C.
Telemetry Integration via RS485 & CAN Bus
Fleet management telematics across European transport corridors require real-time visibility into secondary battery health (SoC, SoH, temperature, and charging cycle records). Custom OEM DC-DC charger firmware developed by Eltrum integrates RS485 Modbus and automotive CAN 2.0B interfaces, streaming real-time voltage, current draw, and error flags directly into vehicle telematics gateways without requiring secondary external shunt sensors.
Procurement FAQ
Frequently Asked Questions by European Technical Buyers
Essential guidance on regulatory certification, customs clearance in Spain, thermal performance, and factory customization protocols.
Do Eltrum DC-DC chargers satisfy EU automotive electromagnetic compliance (UNECE R10 / CE EMC)?
Yes. All Eltrum DC-DC converters and battery chargers manufactured for export into Spain and the broader European Union comply rigorously with CE EMC directives (EN 55032 Class B radiated emissions and EN 55035 immunity standards) as well as UNECE Regulation 10 automotive electromagnetic compatibility guidelines. Our power stages feature multi-layer internal common-mode filtration, ensuring zero interference with VHF commercial radios, GPS navigation antennae, or CAN bus networks.
How does the smart alternator detection logic function on Euro 6d vehicles?
Our units utilize precision DSP voltage windowing paired with ignition sense lines. When the Euro 6d smart alternator drops its output to 12.0V during coasting or acceleration, the internal buck-boost controller maintains full CC/CV charging voltage without dropping out. An adjustable ignition sense wire (D+ terminal) prevents the secondary charger from drawing current when the engine is off or idling at a start-stop signal.
What is the standard lead time and DDP shipping process to Zaragoza/Aragon?
For standard evaluation units and pilot test batches (5–20 units), orders dispatch within 3–7 working days via air express (FedEx/DHL/UPS) directly to Zaragoza Airport (ZAZ) or Madrid-Barajas (MAD) customs hubs with typical transit times of 4–6 business days. For OEM containerized production runs, sea freight is routed via the Port of Valencia or Port of Barcelona, followed by direct rail/road connection to PLAZA Zaragoza under DAP or DDP incoterms.
How are high engine bay ambient temperatures mitigated during Spanish summers?
Our dual-battery chargers utilize aluminum alloy die-cast heat-dissipation enclosures combined with thermally conductive silicone encapsulation (potting). If internal power transistor junction temperatures exceed 90°C during prolonged idling in 40°C+ Iberian weather, an automated thermal foldback circuit decreases output current linearly rather than shutting down abruptly, keeping essential electronics active without damage.
Can you provide custom buyer labels, laser engraving, and custom harnesses?
Yes. Shenzhen Eltrum Electronic Co., Ltd. provides full OEM/ODM manufacturing. We routinely provide private labeling, silk-screened or laser-etched European brand logos, custom anodized enclosure colors, custom charging voltage profiles (e.g., specific LiFePO4, LTO, or ternary lithium cutoff points), and pre-crimped Anderson Powerpole, Deutsch DT, or waterproof automotive wire harnesses.
What is the minimum order quantity (MOQ) for custom firmware modifications?
Standard catalog converters and dual-battery chargers start from an accessible MOQ of only 5 units to facilitate engineering verification in prototype vehicles. For custom firmware programming (such as unique RS485 communication protocols or specialized multi-step CC/CV curves), custom production runs typically begin at 50 to 100 units, backed by comprehensive bench test reports and validation logs.
Direct Factory Profile
Shenzhen Eltrum Electronic Co., Ltd.
Founded in 2015, Shenzhen Eltrum Electronic Co., Ltd. is an onsite-verified manufacturer specializing in high-reliability DC-DC converters, isolated power modules, and intelligent battery charging systems. Operating from our 3,000 m² ISO 9001:2015 certified facility in Shenzhen's Bao'an industrial district, we employ 50–100 specialized electronics professionals dedicated to power conversion engineering.
Our core strength lies in galvanically isolated and high-power synchronous buck-boost architectures. Every single charger leaving our facility undergoes automated SMT optical inspection (AOI), complete vacuum silicone potting for IP67/IP68 environmental ingress resistance, and rigorous 100% full-load thermal burn-in testing.
Serving over 130 countries, we are a trusted manufacturing partner for automotive OEMs, overland camper builders, solar distributors, and industrial robotics integrators across Germany, France, the United States, Australia, and Spain.
Request an OEM Engineering Consultation & Sample Evaluation
Whether you require custom buck-boost charging profiles for an electric commercial fleet in PLAZA Zaragoza, high-amperage 24V-to-12V modules, or private-label production with custom harnesses, our power engineering team responds within 24 hours with complete datasheets and pricing.
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