Yuchai 4R Series 38kVA Open Frame Diesel Generator, Home Standby Power for Residential Use

Product Overview

The WOPUSAI Yuchai 4R series 38kVA diesel generator set is a cost‑optimized open‑frame power unit built around authentic Yuchai 4R four‑cylinder water‑cooled diesel engine (Model 4R120D‑40). It pairs with Foshan Statum STC‑30 brushed self‑excitation alternator to deliver dependable 50Hz three‑phase 400V/230V power output. Adopting natural‑aspiration intake and direct‑injection fuel structure, this unit prioritizes stable performance and low overall ownership cost. Its compact footprint makes it an ideal pick for space‑constrained locations, small‑scale backup power, rental fleets and on‑site temporary power supply projects.

‑ Product Series: Yuchai 4R Series 38kVA Diesel Generator Set

‑ Apparent Power: 38kVA, 50Hz, 1500rpm

‑ Engine: Yuchai 4R Model 4R120D‑40 four‑cylinder diesel engine

‑ Alternator: Foshan Statum STC‑30 Brushed Self‑Excitation Synchronous Alternator

‑ Rated Voltage: 400V/230V three‑phase

‑ Startup Method: DC 24V electric start

‑ Target Use Cases: Small workshop standby power, generator rental, job‑site temporary power, off‑grid rural power supply

Product Showcase

Compact Yuchai 4R 38kVA Open‑Type Diesel Genset

This complete open‑base generator integrates Yuchai 4R water‑cooled diesel power unit and STC‑30 brushed self‑excitation alternator.

The 4‑cylinder Yuchai 4R engine features 3.4L displacement, natural aspiration and direct‑injection fuel delivery. Equipped with mechanical speed governor and 24V DC electric start, it uses 40℃ standard water‑circulation cooling to maintain stable operating temperature during intermittent and medium‑duration continuous load. Matched STC‑30 brushed alternator applies E‑class insulation, IP22 ingress protection, star‑point wiring and AVR automatic voltage adjustment, power factor 0.8 lag. The brushed self‑excitation layout simplifies local field maintenance. Compact overall dimension greatly reduces space occupation for installation and storage.

Key Specifications

Core Advantages

1. Space‑Saving Compact Yuchai 4R Inline Four‑Cylinder Engine Original Yuchai 4R inline four‑cylinder powerplant, 3.4L displacement natural‑aspiration setup. It achieves balanced fuel consumption of 220g/KW/h. Compared with larger displacement gensets, this model occupies less floor area, perfectly fits sites with limited installation space.
2. Field‑Friendly STC‑30 Brushed Self‑Excitation Alternator STC‑30 brushed alternator with AVR voltage stabilization. E‑class insulation and IP22 protection grade cope well with ordinary workshop and construction‑site ambient conditions. Brushed design means spare carbon‑brushes are widely accessible globally. Local repair technicians can finish component replacement without specialized tools, lowering after‑sales threshold for rental business operators.
3. Robust Mechanical‑Governor Powertrain, High Environmental Adaptability Mechanical speed governor with fewer sensitive electronic components, stronger anti‑interference capacity for dusty, unstable‑power working environments. 24V DC electric start offers reliable ignition performance. Standard water‑cooling circulation prevents overheating under medium‑time continuous running.
4. Light‑Weight Open‑Base Design for Easy Logistics & Servicing Whole unit only weighs 700KG. Moderate weight brings advantages for land transport, site hoisting and equipment relocation. Open‑frame layout exposes oil filter, fuel filter and inspection points; routine maintenance work can be completed rapidly without heavy disassembly work.
5. Cost‑Balanced Solution for Mid‑Small Power Demands Optimized cost‑performance positioning, not pursuing ultra‑long‑time heavy‑load operation, but fully meets standby backup, intermittent site power and rental‑scenario requirements. Suits buyers who prioritize purchase cost and convenient local maintenance.

🎯 Application Scenarios

‑ Standby emergency power for small workshops and processing factories ‑ Temporary power supply for construction and engineering sites ‑ Generator rental company fleet stocking ‑ Off‑grid power for countryside and remote villages ‑ Backup power for small retail stores and light‑industry facilities

⚙️ Optional & Customization

‑ Sound‑attenuated silent canopy / rain‑proof housing optional ‑ ATS automatic transfer switch for auto‑start upon mains failure ‑ Extended base fuel tank, upgraded control panel optional ‑ Supply scope: Complete open‑frame generator unit

Custom Workflow: Requirement Confirmation → Quotation → Production → Pre‑delivery Running Test → Shipment

📦 Packaging Standards

‑ Packaging: Bare unit with anti‑rust treatment; export wooden crate optional ‑ Complies with ISPM‑15 requirement for sea and land freight ‑ Attached documents: Operation manual, factory test certificate, packing list

🚛 Shipping & Delivery

‑ Full cargo insurance, end‑to‑end logistics tracking ‑ Reinforced fixing for ocean‑voyage transportation ‑ Complete customs‑declaration documents for cross‑border trade ‑ Standard production lead‑time: 10‑20 working days

🏢 Brand Introduction

WOPUSAI, headquartered in Foshan Guangdong, focuses on generator set assembly and full‑series generator spare‑parts supply. We assemble diversified Yuchai‑powered gensets covering brushed and brush‑less alternator versions, and supply matching filters, AVR modules, instrument boxes and control cabinets. Every finished unit undergoes strict no‑load and load testing before leaving factory. We deliver reliable power equipment and technical support for global distributors and end‑users.