Inside a Factory Acceptance Test: A Returning African Client Verifies His 30 kW Soundproof Generator Set
Factory Acceptance Test
Published in Power & Machinery Insights
•
Reading Time: 7 mins
A generator set can be perfectly specified on paper and still disappoint on site. This is a walk-through of a recent Factory Acceptance Test (FAT) — the last checkpoint before a unit leaves our floor — in which a returning client from Africa, himself a generator industry professional, put a 37.5 kVA / 30 kW soundproof diesel generator set through a four-stage verification. Full test video included below.
The 37.5 kVA / 30 kW soundproof unit on the Allian Power test bay during the live FAT.
Why a Factory Acceptance Test Matters More Than the Spec Sheet
Ratings on a datasheet are calculated. They are produced under controlled conditions, on a bench, by an engineer who knows exactly what the machine is supposed to do. What matters to a buyer is different: does this particular unit, with this engine, this alternator and this canopy, actually hold its numbers while it is running hot, under load, after two hours of continuous duty?
A FAT answers that question before the container is sealed — not after it lands 8,000 km away.
On the Spec Sheet
Calculated
Values derived from design parameters and type testing. Steady-state ratings at rated speed, rated power factor and ambient reference conditions. Valid, comparable, and necessary — but they describe a category of machines, not the one you are buying.
On the Test Floor
Measured
Readings taken from your unit, on a load bank, while it is hot. Voltage and frequency under steady load, transient response to load steps, sound pressure at a defined distance, and a physical inspection of the finished machine.
For buyers in African markets the stakes are higher than usual. Long shipping times, limited availability of local spares, and sites where the grid is unreliable or absent mean a unit that fails on arrival does not cause a delay — it causes a shutdown. Running the machine under load while your own representative stands next to it is the cheapest insurance available in this business.
⚡ What a FAT should always include
A full-load run on a load bank, steady-state voltage and frequency readings, a step-load test to check transient response, verification of the control and protection logic, a sound pressure measurement at a defined distance, and a final structural and finishing inspection.
If any of these six is missing, you are not seeing a FAT — you are seeing a walk-around.
A Return Client Who Knows the Industry
The client we hosted for this test is a long-term partner from Africa who also works inside the generator set industry. That detail matters more than any testimonial we could write.
Someone who sells, services and commissions generator sets for a living has no reason to keep buying from a supplier whose machines let him down. A second and third order from a professional is worth more than a hundred references from a first-time buyer.
He did not come to watch a demonstration. He came with a checklist, and he went through it with our engineers point by point.
The Unit Under Test: 37.5 kVA / 30 kW Soundproof Diesel Generator Set
The machine on the test floor was built for standby and prime power duty in demanding environments. Its canopy is engineered for two jobs at once: keeping weather out and keeping noise in — requirements that pull in opposite directions, since acoustic enclosures want to be sealed while engines need air.
Unit Under Test — Key Data
Rated output
37.5 kVA / 30 kW
Application
Standby and prime power
Enclosure
Soundproof canopy, weatherproof construction
Sound pressure level
≤ 75 dB(A) at 7 m, full load
Control & start-up
Digital controller with automatic transfer switch (ATS) logic
Watch the Test Live FAT & Inspection Video
The walk-through below covers the load bank run, the controller readings and the canopy sound measurement taken during the visit.
Inside the Test: Four Stages, Step by Step
Our client and our engineering team worked through a four-stage verification protocol on the 37.5 kVA unit. Each stage answers a different question, and each one is capable of stopping a shipment.
Steady-state voltage, frequency stability, and transient response when load is applied or removed suddenly
Voltage dips on load steps are what damage sensitive equipment — not the steady-state rating
Control and protection integration
Digital controller readings, telemetry, alarm thresholds, automatic transfer switch (ATS) trigger logic and safety shutdowns
An unattended set must start, transfer and shut itself down safely without human judgement
Acoustic canopy evaluation
Sound pressure measured under full load at a defined distance, confirming compliance with the ≤ 75 dB(A) at 7 m target
Noise limits are a permit issue on urban and telecoms sites, not a comfort issue
Structural and finishing sign-off
Anti-vibration mounts, integrity of the base-frame fuel tank, industrial coating coverage, and readiness for export packing
Most transport damage and early corrosion trace back to details checked in the last ten minutes
Soundproofing Is Engineering, Not Padding
Buyers often judge a silent canopy by how thick the walls look. In practice, noise control on a generator set is a system problem with four parts, and the foam is only one of them.
1. Acoustic Absorption
Fire-retardant, oil-resistant lining inside the canopy that does not degrade in heat or crumble with vibration. Cheap foam sags, absorbs oil and stops working within two seasons.
2. Exhaust Silencing
A residential or industrial grade silencer sized to the engine. The exhaust outlet is usually the loudest single source on the machine — no amount of wall lining will fix an undersized silencer.
3. Airflow Path Design
Intake and discharge routed through baffled plenums so air can move freely while sound has no straight line out. This is the hardest part to retrofit and the easiest place for a low-cost canopy to cut corners.
4. Vibration Isolation
Anti-vibration mounts between the engine-alternator assembly and the base frame. Structure-borne noise travels further than airborne noise — it goes through the ground, not the air.
⚡ Three questions to ask before comparing noise figures
At what distance was the decibel figure measured? Was the set at full load? And was the measurement taken in free field conditions?
A “65 dB” claim without those three conditions is not comparable to a “75 dB(A) at 7 m under full load” claim — it is simply a smaller number.
From the Test Floor to the Container
With the test protocol complete and the readings signed off, the unit moved directly into anti-corrosive export packaging. For sea freight to African ports, that means moisture protection, corrosion inhibitors on exposed metal, and a packing specification that assumes weeks of humidity and salt-laden air before the container is opened.
Sea Freight Documentation That Travels With the Unit
Test records and signed readings • Wiring diagrams • Operation and maintenance manual • Recommended spare parts list for the first 2,000 running hours.
That last item is the one buyers most often forget to ask for. Knowing which filters, belts and seals to have on the shelf before the first service interval is what turns a good machine into an asset that stays online.
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Product Features
Famous brand diesel engine core, stable performance and long service life
Galvanized steel shell, anti-corrosion, rainproof and dustproof
Customizable wheel and braking system, high driving safety
Integrated spring shock absorption, stable unit operation
Full set of monitoring instruments with voltage regulation and short-circuit protection
10kW-1200kW full power range coverage
Product Name
General Trailer Mounted Diesel Generator Set
Power Range
10kW ~ 1200kW
Optional Engine Brands
Volvo, Perkins, Cummins, Weichai , Yuchai
Wheel Configuration
2/4/6 Wheels (Customizable)
Braking System
Manual / Automatic / Pneumatic / Hydraulic
Shell Material
High-quality Galvanized Steel Sheet
Continuous Working Time
≥8 Hours Full-load Operation
Application Scenarios
Field Construction, Power Maintenance, Emergency Rescue, Municipal Engineering
The dual-axle heavy-duty trailer diesel generator set is specially developed for large-scale engineering, mining, and long-term high-load power supply scenarios. Adopting double-axle load-bearing structure and reinforced channel steel integral frame, it has super load-bearing capacity, more stable operation and higher driving safety, which can meet the long-term full-load operation demand of high-power equipment.
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Core Features
Dual-axle reinforced structure, super load-bearing and ultra-stable
500kW-1200kW high-power full-load stable output
Three-in-one braking system for full safety protection
Large-capacity fuel tank for long-time continuous operation
Reinforced shock absorption structure, adapt to high-intensity work
Product Name
Dual Axle High Power Trailer Diesel Generator
Structure Type
Double Axle Reinforced Trailer
Power Range
500kW ~ 1200kW
Main Engine Brands
Volvo, Cummins, Perkins
Braking System
Inertial / Parking / Emergency Triple Braking
Continuous Operation Time
≥8 Hours Full Load
Application Scenarios
Large Mining, National Engineering, Regional Emergency Power Guarantee
Our silent trailer diesel generator set integrates advanced sound insulation technology on the basis of standard mobile trailer power stations, perfectly solving the noise pollution problem of traditional generator units. Powered by Volvo, Perkins, Cummins, Weichai and Yuchai high-quality diesel engines, this low-noise mobile power station combines excellent mobility and ultra-low noise performance, meeting environmental protection power supply requirements for urban and residential scenarios.
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Core Advantages
Ultra-low noise design, noise ≤75dB(A) at 1m distance
The 2-wheel portable mobile diesel generator set is a lightweight and flexible mobile power equipment developed for small-scale temporary power demand. It adopts a compact integrated design with a two-wheel walking structure, featuring light weight, small size and convenient towing, which can be quickly transferred and deployed in narrow construction sites and complex terrain.
The unit is equipped with high-quality Yuchai and Shangchai diesel engines as standard, with optional imported Volvo and Perkins power cores. The whole machine is made of lightweight high-strength galvanized steel, which is anti-rust and anti-corrosion. The 90° flexible steering structure and manual braking system make towing and parking more convenient and safe.
Retaining the core advantages of all-weather rainproof and dustproof, the portable generator is equipped with hydraulic support doors, real-time observation windows and emergency stop protection devices. The built-in fuel tank supports long-term stable operation. It is widely used for small engineering operations, temporary road lighting, communication equipment power supply, family and workshop emergency power supply.
Product Advantages
Ultra-compact structure, flexible movement and easy transportation
Lightweight design, suitable for narrow and complex working spaces
Simple operation and low maintenance cost
All-weather outdoor waterproof and dustproof performance
Cost-effective small mobile power solution
Product Name
2 Wheels Portable Towable Diesel Generator
Wheel Configuration
2 Portable Towing Wheels
Steering Angle
90° Flexible Steering
Power Range
10kW ~ 100kW
Standard Engine
Yuchai, Shangchai (Volvo/Perkins Optional)
Feature
Portable, Flexible, Easy Deployment
Application
Temporary Construction, Lighting, Communication Backup, Small Emergency Power
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