Smart 36V Lithium Battery Charger DC 12V to DC 43.8V 13A Waterproof
- Input Voltage: DC 10V–16V
- Charge Profile: 43.8V CC/CV (13A)
- Ingress Rating: IP67 Waterproof
- Efficiency: ≥94% Peak
Direct Factory Catalog
Featured Industrial Voltage Regulators & Converters
Engineered in our verified Shenzhen production lines to withstand wide input fluctuation, extreme ambient thermal profiles (-40°C to +85°C), and rugged field environments across Bulgarian automotive, agricultural, and solar installations.
1500W High Power Buck-Boost Converter 10–60V to 12V/24V/48V
- Input Range: 10V–60V DC
- Max Output: 1500W Continuous
- Control Bus: RS485 Protocol
- Cooling: Intelligent Thermal Sink
DC 10–44V to 12V 50A/60A High Current Buck-Boost Stabilizer
- Input Range: 10V–44V DC
- Output Current: 50A–60A Dynamic
- Application: Heavy Bus & Agricultural
- Protection: OVP / OCP / OTP / SCP
8–40V to 13.8V 25A/30A Lead/LiFePO4 Float Voltage Stabilizer
- Input Range: 8V–40V DC
- Regulated Output: 13.8V ±1% Load Reg
- Housing: Die-cast Aluminum IP68
- Thermal Range: -40°C to +85°C
8–40V to 12V Precision Car Telematics Voltage Stabilizer
- Input Compatibility: 12V / 24V Transients
- Output: 12V Regulated (1A–6A)
- Features: Anti-Cranking Drop Clamp
- Certifications: CE / RoHS / E-Mark ready
24V to 12V 85A/100A Step-Down Buck Converter for Truck & Bus
- Nominal Input: 24V (18–35V Operational)
- High Output: 12V at 85A–100A (1200W)
- Efficiency: 96% Synchronous Rect.
- Enclosure: Vibration-Proof Potting
18–90V to 12V 10A Ultra-Wide Input Galvanically Isolated Converter
- Input Window: 18V–90V Ultra-Wide
- Dielectric Isolation: 1500V DC Primary/Sec
- Target Sector: Telecom BTS & AGVs
- EMC Standards: EN 55032 / EN 61000
12V to 24V/48V High Current Boost Converter (Up to 50A Output)
- Step-Up Ratio: 12V DC → 24V or 48V DC
- Output Power: Up to 1200W Continuous
- Ripple & Noise: ≤100mVp-p Low EMI
- Deployment: Commercial EV & Lighting
500+
Standard Topology Models
130+
Global Export Destinations
ISO 9001
Certified Factory & CE/RoHS
5 Units
Low OEM Validation MOQ
Engineering Architecture
Industrial DC-DC Voltage Regulation: Technical Framework for Balkan Integrators
When specifying power conversion components for Central and Eastern European industrial ecosystems, systemic reliability is dictated by circuit topology, transient mitigation, and thermal design headroom.
Synchronous Rectification
Traditional Schottky diode regulators dissipate excessive power at high currents ($P_{loss} = V_F \times I_o$). Eltrum converters utilize ultra-low $R_{DS(on)}$ MOSFET synchronous rectifiers paired with high-frequency planar transformers. This drives conversion efficiencies up to 96%, curtailing internal junction temperatures inside sealed IP68 enclosures deployed in hot engine bays.
Galvanic Ground Isolation
Differential potential in distributed Bulgarian industrial plants (e.g., metallurgical sites in Pernik or substation SCADA networks) can trigger severe ground loops. Our isolated regulator modules deliver dielectric isolation ratings up to 1500V DC, preventing parasitic current paths from damaging sensitive microcontrollers and telemetry nodes.
Automotive Transient Clamping
Bulgarian transport operations encounter severe alternator load dumps (ISO 7637-2 / ISO 16750-2 pulses) during engine start in harsh winter conditions. Our multi-stage input LC filters and bi-directional TVS suppression arrays clamp 100V voltage spikes within 5 nanoseconds, protecting downstream electronics against voltage breakdown.
| Converter Topology | Input Voltage Window | Regulated Output | Efficiency | Ideal Regional Application | OEM Inquiry |
|---|---|---|---|---|---|
| Synchronous Buck | 24V (18V–36V) / 48V (36V–72V) | 12V, 13.8V, 24V (up to 100A) | 94% – 96.5% | Heavy commercial transport (Sofia/Ruse freight), bus LED fleets | Get a Quote |
| 4-Switch Buck-Boost | Wide 8V–40V / 10V–60V | 12.0V, 19.0V, 24.0V, 48.0V | 91% – 94.5% | Combines solar & engine battery systems; Dobrudja farm combines | Get a Quote |
| Current-Mode Boost | 9V–20V (12V nominal) | 24V, 36V, 48V (up to 1200W) | 93% – 95.8% | Commercial electric vehicles, auxiliary hydraulics, yacht masts | Get a Quote |
| Opto-Isolated Flyback/Forward | 18V–36V / 36V–75V / 18V–90V | 5V, 12V, 24V (50W–400W) | 88% – 92.0% | Telecom BTS towers (A1/Vivacom), railway signalling, AGVs | Get a Quote |
Territory Deployment
Localized Application Scenarios Across Bulgaria’s Economic Corridors
Bulgaria represents an essential manufacturing, logistics, and energy nexus connecting Southeastern Europe to the wider European Single Market. Eltrum’s voltage regulators are engineered specifically to address local sector requirements.
Transit Logistics & Fleet Systems (Plovdiv & Sofia)
Plovdiv’s Trakia Economic Zone and Sofia’s major logistics hubs process high volumes of international haulage crossing the Balkan peninsula along Pan-European Corridor IV and VIII. Long-haul 24V trucks depend on our rugged 24V-to-12V buck converters (up to 100A) to power digital tachographs, refrigeration telemetry, Fleet Management Systems (FMS), and emergency lighting without battery degradation.
PV Plants & BESS Transition (Maritsa Basin)
As Bulgaria phases coal assets in the Maritsa East basin into massive utility-scale PV and Battery Energy Storage Systems (BESS), auxiliary power supplies face extreme voltage shifts. Eltrum’s wide-input (10V–60V and 18V–90V) buck-boost converters and LiFePO4 battery-to-battery modules ensure rock-solid 24V/48V control rails for inverters, tracker motors, and monitoring hardware.
Heavy Agricultural Machinery (Dobrudja Region)
Bulgaria's primary grain basin in Dobrudja employs advanced harvesters, seeders, and autonomous GPS guidance systems. Working through dust, severe ground vibration, and wide seasonal temperature swings (-25°C to +40°C), farm machinery relies on our IP68 hermetically potted 12V and 24V regulators to eliminate electrical noise induced by heavy inductive hydraulic solenoids.
Maritime & Harbor Infrastructure (Varna & Burgas)
Commercial shipping, naval craft, and recreational vessels stationed along the Black Sea ports of Varna and Burgas require salt-mist resistant electrical conversions. Our waterproof AC-DC chargers (300W to 1000W) and isolated DC-DC modules prevent galvanic hull corrosion while providing clean power to sonar arrays, radar domes, and communications suites.
Market Trajectory
Industry Trends Shaping Voltage Regulator Sourcing in Bulgaria (2025–2030)
Technological shifts across Bulgaria are aligning with the European Green Deal and national re-industrialization targets, generating specific technical mandates for OEM power supply procurement.
1. Accelerating Transition to Lithium Iron Phosphate (LiFePO4)
Bulgarian commercial fleets and telecom operators are systematically phasing out valve-regulated lead-acid (VRLA) and gel batteries in favor of LiFePO4 cells. Lithium requires strict two-stage Constant Current / Constant Voltage (CC/CV) algorithms with precise cut-off voltages (such as 14.6V for 12V nominal packs). Standard automotive alternators or unregulated supplies overcharge and degrade lithium cells. Eltrum’s DC-DC smart chargers prevent alternator overheating while delivering thermal compensation tailored to Bulgaria's continental climate.
2. Digital Telematics & Intelligent Bus Integration (RS485/CAN)
Traditional "dumb" analog converters are rapidly being superseded in Bulgarian OEM equipment by digitally supervised power modules. Modern automated warehouse AGVs produced in Sofia and commercial municipal transport retrofits in Burgas require live telemetry. Eltrum’s WG-12C800M and 1500W platforms support RS485 interfaces, allowing host PLCs or vehicle computers to dynamically adjust output voltage, read real-time current draw, and monitor chassis thermal states.
3. Stringent EU Ecodesign & CE/EMC Harmonization
As a full member of the European Union, Bulgaria strictly enforces EN 55032 Class B radiated emissions and the Low Voltage Directive (LVD). Machine builders cannot afford customs delays or administrative rejection caused by subpar power modules producing electromagnetic interference on industrial Ethernet lines. Eltrum builds all OEM units to comply with rigorous CE and RoHS limits, backed by verified laboratory test certificates provided during the RFQ stage.
Direct Factory Advantage
Shenzhen Eltrum Electronic Co., Ltd. — Engineering Precision Since 2015
Shenzhen Eltrum Electronic Co., Ltd. operates a high-precision, onsite-inspected manufacturing facility in Shenzhen's Bao'an industrial corridor. We engineer DC-DC converters, battery chargers, AC-DC power supplies, and high-voltage power modules engineered for the demanding world stage.
With an experienced R&D core specializing in transformer winding, high-frequency PCB topology, and thermal encapsulation, we supply industrial partners across 130+ countries including Germany, the UK, Poland, and Bulgaria.
- Factory-Direct Customization: Tailored voltage thresholds (e.g. 13.8V, 28V, 43.8V, 58.4V), custom wire harnesses, and private labeling.
- Low Evaluation Barrier: Standard sample batches available from 5 units to accelerate prototyping and field testing.
- Rigorous Burn-in Protocol: 100% full-load thermal burn-in testing and automated electrical inspection prior to dispatch.
- Flexible Commercial Terms: T/T, PayPal, and Escrow support with FOB Shenzhen, CIF Varna/Burgas, or DAP Sofia delivery options.
B2B Buyer Guide
Frequently Asked Questions for Bulgarian Procurement Specialists
Clear, practical answers addressing lead times, EU customs compliance, product sizing, and custom production for electrical distributors and equipment integrators.
How are shipments managed from Shenzhen to Bulgaria (Sofia, Plovdiv, Varna)?
We provide full logistics flexibility based on order urgency and volume. For urgent sample evaluations and small batches (≤50 kg), we ship via air express (DHL, FedEx, UPS) directly to your facility in Sofia or Plovdiv within 4 to 7 working days. For commercial production orders, we support consolidated sea freight into the Port of Varna or Port of Burgas, as well as multimodal air-freight into Sofia Airport (SOF). We handle all export customs clearance documents in China, providing commercial invoices with accurate TARIC/HS codes (typically 8504.40.90 for static converters) to simplify import duty clearance with the Bulgarian National Customs Agency (Агенция „Митници“).
Are Eltrum voltage regulators compliant with European Union CE and RoHS directives?
Yes. All converter and charger series exported to Bulgaria are designed and manufactured in accordance with applicable European Union directives: the Electromagnetic Compatibility (EMC) Directive 2014/30/EU, the Low Voltage Directive (LVD) 2014/35/EU, and the RoHS Recast Directive 2011/65/EU (including delegated directive 2015/863). Test reports covering EN 55032 (emission limits) and EN 61000-4 series (immunity testing) are available upon request for technical file auditing.
When should our engineering team select a Buck-Boost converter over a standard Buck regulator?
A standard buck (step-down) regulator functions reliably only when the input voltage consistently exceeds the required output voltage plus a mandatory circuit headroom margin (typically 2V to 3V). However, if your system operates from a 12V battery bank, the real-world battery voltage will fluctuate significantly: sagging down to 9V during engine cranking or high-load conditions, and surging to 14.4V–14.6V during active alternator or solar charging. If your critical load requires an exact, clean 12.0V or 13.8V rail without disruption, a 4-switch synchronous buck-boost converter is essential, as it automatically steps down or steps up the voltage across the fluctuating input window.
What is the typical Minimum Order Quantity (MOQ) for custom OEM/ODM configurations?
To support prototype validation, standard catalogue models are available from an MOQ of just 5 units. For customized OEM modifications (such as calibrated non-standard voltages like 15V or 28V, customized lead wire lengths, waterproof Deutsch/Anderson connector integration, or buyer-specific private labels), our standard OEM MOQ is generally 50 to 100 units depending on the enclosure footprint. Completely bespoke PCB circuit engineering (ODM) typically starts at 200–500 units.
Can Eltrum DC-DC chargers be utilized with Smart Alternators (Euro 5/Euro 6 engines)?
Yes. Modern commercial vans and trucks (Mercedes Sprinter, Iveco Daily, Ford Transit) popular in Bulgarian transport networks incorporate ECU-controlled "Smart Alternators" equipped with regenerative braking. These alternators regularly cycle their output down to 12.2V to conserve fuel, which terminates charging on ordinary split-charge relays. Eltrum’s DC-DC battery-to-battery chargers feature ignition-controlled wake-up lines and wide-input tolerance, maintaining steady multi-stage CC/CV charging to auxiliary lithium or AGM house packs regardless of alternator voltage drops.
What payment terms and warranties are extended to Bulgarian B2B buyers?
We accept standard corporate international payment options including wire transfer (T/T in USD or EUR), PayPal for sample orders, and Escrow facilities. Delivery terms can be negotiated on EXW, FOB Shenzhen, CIF, or DAP basis. All industrial power modules carry a standard 12-to-24-month manufacturer warranty backed by individual unit serial tracking. In the event of a field failure, our engineering department provides immediate root-cause telemetry evaluation and rapid batch replacement.
Connect Directly With Our Power Supply Engineering Team
Whether you require a standard 24V-to-12V 100A truck converter, an isolated 18–90V telecom module, or a custom-designed LiFePO4 charging curve for OEM deployment in Bulgaria, our engineers are standing by to provide technical datasheets, CAD 3D models, and competitive direct-factory quotations.