NMX‑MRU‑4000 / Rev 01 / DIN 41773 · IEC 62477‑1 · MIL‑STD‑461E / Noida · India 2026 · Product Page

NMX-MRU-4000 · DELIVERED

Mobile rectifier & battery charger. 4000 amps, on wheels.

Name: Mobile Rectifier & Battery Charger Unit — 1520 kW / 4000 A
Brand: Neometrix

A megawatt-class DC power station that tows to the jetty: 24-pulse thyristor conversion from 415 V shore supply to 175–380 V DC at up to 4000 A with ±1% regulation — charging battery banks to the DIN 41773 characteristic or feeding DC shore supply to a berthed vessel. Delivered against Indian Navy dockyard programmes.

Enquire — rectifier unit Capability sheet (PDF)

Trailer-mounted mobile rectifier and battery charger unit in a weatherproof enclosure on a naval dockyard jetty

Fig · 01 Trailer-mounted unit on the wharf — representative configuration of the delivered type

Rated Power

1520kW

Output Current

4000A DC

Output Voltage

175–380V DC

Regulation

±1%

Conversion

24pulse

ISO 9001 / 14001 DGAQA registered Delivered — Indian Navy dockyards GeM registered supplier Noida · India

Overview

A vessel alongside still needs megawatts of DC.

When a ship or submarine is berthed for refit, its own generation goes quiet — but its battery banks still need charging to a precise characteristic, and its DC systems still need shore power. That demand moves from berth to berth as the refit programme moves. A fixed rectifier room cannot follow it. This unit can.

Touchscreen HMI control panel, meters and tinned copper busbar terminations of a high-current battery charging rectifier

Fig · 02 Touchscreen HMI, hard metering, and the tinned-copper busbar compartment behind it

The unit is a complete DC power station in a weatherproof NEMA 4X marine canopy on a turntable trailer — towed to the wharf, connected to 415 V shore supply, and delivering up to 4000 A of precisely regulated DC shortly after connection. Constant-voltage and constant-current modes with battery-voltage feedback charge lead-acid banks to the DIN 41773 IU characteristic; the same busbars feed DC shore supply when the vessel simply needs power.

The electrical engineering is deliberately conservative: 24-pulse thyristor conversion keeps ripple below ±1% and pushes major harmonics out of the input side; response to load steps is under 200 milliseconds; efficiency stays at 95% or better with power-factor correction built in. It runs continuously at any current from 200 to 4000 A, in salt-laden jetty air at up to 50 °C.

Battery-grade DC, delivered to whichever berth the refit programme needs it at — this week.

Delivered · In Service

Two naval dockyard programmes

Mobile rectifier / battery-charger units delivered against Indian Navy dockyard contracts in two ratings — 1520 kW at 4000 A and 1200 kW at 3000 A — from tender specification to commissioning.

Engineered · For the Jetty

Marine by design, not by paint

NEMA 4X drip-proof canopy, class-F VPI insulation, forced-air cooling, and MIL‑STD‑461E EMI/EMC compliance — specified for salt spray, 98% humidity, and 50 °C on the wharf.

Proven · Before It Ships

A load bank on board

A built-in 100 kW load bank lets the charger be tested and tuned without a vessel alongside — at the works, at acceptance, and at every subsequent maintenance check.

System

Shore supply in. Battery-grade DC out.

One power path, engineered end to end: transformer isolation, 24-pulse thyristor conversion, power-factor correction, and massive tinned-copper busbars — supervised by a touchscreen control system that logs every ampere-hour it delivers.

FIG · 03POWER PATH · CONTROL · LOAD BANK

Fig · 03 415 V shore input to 4000 A DC output — with HMI supervision and built-in test load

Sys · 01

Conversion

24-pulse thyristor rectification to the DIN 41773 IU battery-charging characteristic — ripple under ±1%, major harmonics cancelled at the input, closed-loop response under 200 ms, continuous duty from 200 to 4000 A.

Sys · 02

Control & Logging

Touchscreen HMI with hard metering in parallel — CV/CC selection with or without battery feedback, digital set-points, full data logging with USB export, and remote operation over RS485 / Ethernet.

Sys · 03

Protection & Safety

Safety architecture to IEC 62477‑1: alarm handling with siren and visual annunciation, charging cut-off on critical events, emergency stop, earth-fault and reverse-polarity indication, temperature monitoring of windings and thyristor stacks, APFC panel.

Sys · 04

Mobility & Interface

Turntable trailer with locking tow bar and solid tyres, road-transferable between yards; ETP-grade tinned copper busbars sized below 1.2 A/mm², terminating four 300 mm² input cables per phase and twenty-five DC cable sets at the output.

Holding a rectifier, battery-charger, or shore-supply tender? Send it across — clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference configuration, as delivered.

The parameters below reflect the 1520 kW configuration delivered against the naval tender. Ratings, voltage windows, and mounting are re-scoped against your specification.

Full specification — expand

System	Mobile battery charger cum rectifier unit · trailer-mounted · outdoor marine duty
Rating	1520 kW at 380 V DC, 4000 A · second delivered rating 1200 kW at 3000 A · other ratings engineered to order
Conversion	Thyristor-controlled, 24-pulse · DIN 41773 IU characteristic for lead-acid battery charging
Input	415 V AC ±10%, 3φ, 50 Hz ±3 Hz, 4-wire · ~2000 kVA · four 300 mm² cables per phase, 75 m feed capability
Output Voltage	175–380 V DC, ±1% regulation · open-circuit approx. 455 V · deviation ±2% prolonged / ±4% intermittent
Output Current	200–4000 A DC, ±1% regulation · inductive, resistive, and capacitive loads · continuous duty
Operating Modes	Constant voltage / constant current · with or without battery-voltage feedback · closed-loop control · response <200 ms
Quality & Efficiency	Ripple <±1% no-load to full-load · efficiency ≥95% · power factor 0.8 lag to unity · in-built APFC panel
Control System	Touchscreen HMI (≥17″) with GUI · hard meters and selector switches in parallel · data logger with .xlsx / .jpeg USB export · remote via RS485 / USB / Ethernet
Safety	IEC 62477‑1 architecture · alarm siren + visual annunciation · critical-event charging cut-off · emergency stop · earth-fault and reverse-polarity indication
Monitoring	Temperature monitoring of transformer windings, interphase transformers, and thyristor stacks with trip settings · ampere-hour totalisation
Test Facility	Built-in 100 kW fan-cooled load bank for testing and tuning without a vessel
Busbars	ETP-grade copper to IS 191 / IS 613, tinned · current density <1.2 A/mm² · output accommodates 25 sets of 300 mm² DC cables
Enclosure	NEMA 4X drip-proof outdoor canopy · forced-air cooling · class-F VPI (or class-H) insulation · illumination and indicator suite
Environment	15–50 °C · up to 98% RH · salt-spray jetty atmosphere · noise <75 dB at 1 m · EMI/EMC to MIL‑STD‑461E
Trailer	Turntable arrangement with locking tow bar · minimum six solid tyres · under 9 × 3 × 3.5 m · under 15 t including trailer · road-transferable between yards
Support	Two-year operation & maintenance spares package scoped with the unit · commissioning and operator training at the dockyard
Status	Delivered against Indian Navy dockyard programmes · configurable to customer tender specification

PDF · 1 page

Mobile Rectifier & Charger — Capability Sheet

Tender Response

Send your specification — clause-by-clause compliance matrix

Variants

One power platform, many tender names.

Tenders call this equipment a mobile rectifier, battery charger cum rectifier, shore-supply unit, or dockside DC power station. The same conversion-and-control platform answers all of them, rated to the clauses of your specification.

Var · 01

Ratings to Order

The delivered platform spans 1200–1520 kW at 3000–4000 A; higher and lower ratings, other voltage windows, and 60 Hz input variants are engineered against your vessel and battery schedule.

Var · 02

Fixed Shore Stations

The same 24-pulse conversion and control architecture installed as a fixed rectifier room or jetty substation — where the berth plan is permanent and the trailer is not needed.

Var · 03

Battery Shop Facilities

Multi-circuit charging and discharging facilities for battery workshops — several independent CV/CC channels, discharge load banks, and centralised logging, engineered to the shop's battery inventory.

Var · 04

High-Current DC Test Supplies

Precision high-current DC sources for test facilities — the same regulation discipline applied to electro-chemical, magnetisation, and equipment-test loads.

Applications

Where it serves.

Wherever large DC loads meet the water's edge — or a battery bank meets its charging schedule.

A · 01Naval dockyards — battery-bank charging for vessels under refit

A · 02DC shore supply to berthed ships and submarines

A · 03Ship repair yards — mobile DC power that follows the berth plan

A · 04Battery workshops — controlled IU charging of large lead-acid banks

A · 05Port and coastal infrastructure — high-current DC for cathodic and process loads

A · 06Defence and industrial test facilities — precision high-current DC sources

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Why 24-pulse rectification?

Two reasons, both electrical hygiene. On the output side, 24-pulse conversion keeps DC ripple below ±1% — battery-grade current that charges without heating the bank. On the input side, it cancels the major harmonics a large rectifier would otherwise inject into the dockyard's supply network, protecting everything else on the same bus.

Q · 02 What is the DIN 41773 IU characteristic?

The standard charging profile for lead-acid batteries: constant current (I) while the bank is depleted, then an automatic transition to constant voltage (U) as it approaches full charge — fast where it is safe, gentle where it matters. The unit implements it with optional battery-voltage feedback, so the transition tracks the actual bank, not an assumption.

Q · 03 Can it survive on an open jetty year-round?

It is specified for exactly that: NEMA 4X drip-proof marine canopy, class-F VPI insulation, forced-air cooling, salt-spray atmosphere, ambient to 50 °C and 98% humidity, with EMI/EMC compliance to MIL‑STD‑461E. The delivered units live outdoors at an Indian Navy dockyard.

Q · 04 How is it tested without a ship alongside?

A 100 kW fan-cooled load bank is built into the unit, so the charger can be run, tuned, and health-checked against a real load at any time — at factory acceptance, at commissioning, and at every maintenance interval — without waiting for a vessel or risking a battery bank.

Q · 05 How mobile is a 15-tonne rectifier, really?

Genuinely road-mobile. The unit sits on a turntable trailer with a locking tow bar and a minimum of six solid tyres, dimensioned under 9 × 3 × 3.5 metres and under 15 tonnes — built to move between berths daily and to transfer between yards over metalled roads spanning hundreds of kilometres.

Q · 06 Can you build to our tender specification exactly?

That is the standard engagement. Both delivered ratings were built clause-by-clause against naval tender specifications. Send yours — rating, voltage window, battery chemistry, environment — and we return a compliance matrix within two working days; export enquiries are handled the same way, with formalities managed as part of the programme.

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Power & support equipment from Neometrix.

Ground and shore support equipment engineered and manufactured at our Noida facility.

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Get a quotation

Send your rectifier
tender specification.

The Defence Programmes desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — rectifier unit Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 DELIVERED — INDIAN NAVY DOCKYARDS GeM REGISTERED SUPPLIER MADE IN NOIDA · INDIA

Mobile rectifier & battery charger. 4000 amps, on wheels.

A vessel alongside still needs megawatts of DC.

Two naval dockyard programmes

Marine by design, not by paint

A load bank on board

Shore supply in. Battery-grade DC out.

Conversion

Control & Logging

Protection & Safety

Mobility & Interface

Reference configuration, as delivered.

One power platform, many tender names.

Ratings to Order

Fixed Shore Stations

Battery Shop Facilities

High-Current DC Test Supplies

Where it serves.

Common questions.

Power & support equipment from Neometrix.

Ground Power Unit

Helicopter Washing Rig

Aircraft Tyre Nitrogen Charging Rig

Send your rectifier
tender specification.

Similar Products

Share This Page

Mobile rectifier & battery charger. 4000 amps, on wheels.

A vessel alongside still needs megawatts of DC.

Two naval dockyard programmes

Marine by design, not by paint

A load bank on board

Shore supply in. Battery-grade DC out.

Conversion

Control & Logging

Protection & Safety

Mobility & Interface

Reference configuration, as delivered.

One power platform, many tender names.

Ratings to Order

Fixed Shore Stations

Battery Shop Facilities

High-Current DC Test Supplies

Where it serves.

Common questions.

Power & support equipment from Neometrix.

Ground Power Unit

Helicopter Washing Rig

Aircraft Tyre Nitrogen Charging Rig

Send your rectifiertender specification.

Similar Products

Share This Page

Send your rectifier
tender specification.