Silent Diesel 400Hz GPU
2.Engine: Diesel, turbocharged, with advanced acoustic enclosure
3.Input: Diesel fuel only – no grid connection required
4.Key feature: 68 dB(A) at 7m – quiet enough for residential‑adjacent airports
5.Applications: Night cargo ops, noise‑sensitive neighborhoods, remote sites without grid power
6.Compliance: MIL‑STD‑704F, EPA / EU Stage V
7.Brand: ACSOON (1‑year warranty, built in Xi’an).
- Product Description
Silent Diesel 400Hz GPU | Low‑Noise Diesel Ground Power for Noise‑Sensitive Airports
Silent 60kVA Diesel 400Hz Ground Power Unit(GPU).
only 68dB@7m, quieter than vacuum cleaner.
Heavy soundproof enclosure, vibration isolation & baffled duct design.
Ideal for noise-limited airports and residential nearby cargo hubs.
Diesel GPUs are usually loud. The neighbors complain. The ramp crew wears earplugs. Not this one.The Silent Diesel 400Hz GPU puts a standard 60kVA 400Hz alternator inside a heavily sound‑attenuated enclosure. The engine itself is a quiet‑running industrial diesel, wrapped in acoustic foam and mounted on vibration isolators. The cooling air flows through a baffled duct – not a straight shot. Result: 68 decibels at 7 meters. That's quieter than a vacuum cleaner.We built this for airports with noise curfews, for overnight cargo hubs next to houses, and for any place that needs diesel‑powered 400Hz but wants to stay friendly with the neighbors.
Silent Diesel 400Hz GPU Main Features
Sound‑attenuated enclosure – 50mm acoustic foam, baffled intake and exhaust.
Slow‑speed fans – Moves cooling air without the turbine whine.
Automatic shutdown on low fuel – Prevents running dry.
Cold start kit – Glow plugs, intake heater. Starts down to -15°C.
Our Advantages
Long-standing customer
19+
over 19 years experience
Factory Area
7/24h
High-Quality Efficiency Service
- 28,698+ long-term repeat clients globally with stable repeat orders
- 19+ years domestic & export manufacturing experience for aviation ground power equipment
- 7,000+ sq.m modern production factory
- 24/7 customer service：＜30 mins quick response + lifetime after-sales support
- 60+ independent patented technologies
- Certified as China National High-Tech Enterprise
- Multiple provincial awards, including Shaanxi AAAAA-Level Credibility Enterprise certification
Technical Parameters
| Parameter | Specification |
|---|---|
| Model Series | ACSOON GPU Series |
| Output | 115V/200V 400Hz, 60kVA continuous |
| Voltage THD | <3% at linear load |
| Engine | 4‑cyl turbo diesel, 4.5L, 110kW |
| Fuel Tank | 400L internal |
| Run Time | 24 hours at 45kVA |
| Noise Level | 68 dB(A) at 7m, full load |
| Sound enclosure | Acoustic foam, baffled ducting |
| Protections | Low oil, high coolant temp, low fuel, over‑crank |
| Compliance | MIL‑STD‑704F, EPA Tier 3 / EU Stage IIIA |
If you need it,Contact us at Email: acpower@acsoonpower.com
1.Why Choose ACSOON Silent Diesel 400Hz GPU?
- Neighbor‑friendly – 68 dB(A) at 7m. Normal conversation level.
- No grid needed – Just fuel. Works anywhere.
- Still powerful – 60kVA continuous, 90kVA for starting surges.
- Easy to service – Full‑sized access doors. The acoustic foam is removable
Our Services
Silent Diesel 400Hz GPU Application Areas
Overnight cargo airports – FedEx, UPS, DHL hubs near houses. Complaints dropped after switching to this.
Residential‑adjacent general aviation airports – Santa Monica, London City, San Diego.
Remote mining and oil airstrips – No grid, but you want to keep the camp quiet.
Military bases near towns – Good neighbor policy.
Quality Control
Noise test – Every unit runs in an open field. Sound meter at 7m. Must be under 69 dB.
Vibration test – Accelerometers on the engine and chassis. Must stay under limits.
Fuel system leak test – Pressurized, soapy water on all fittings. No bubbles.
Load bank test – 60kVA for 2 hours, then 90kVA for 60 seconds.
R&D Results
Acoustic foam – Tried three densities. Settled on 50mm melamine. Absorbs noise, doesn't hold oil.
Air intake – Original design had a straight shot. Noise came right out. Added a 90° bend with foam lining. Dropped 5 dB.
Exhaust – Standard automotive muffler wasn't enough. Added a secondary resonator. Now it's a low hum instead of a bark.
Customer feedback – An airport manager asked for a remote start panel. We added a small control box on a 10m cable.
Packaging and Transportation
Shipped from Xi'an – On a heavy‑duty steel skid with forklift pockets. Wrapped in plastic.
Fuel drained – Tank is empty for shipping. We include 20L in a separate can.
Documentation – Laminated quiet operation guide, engine manual, generator manual.
Export crate – Optional plywood box.
After‑Sales Service
1‑year warranty – Covers engine and generator. Parts only – labor local.
Spare parts (filters, belts, foam panels) kept in Xi'an.
Email support – Engine questions forwarded to our engine partner. Allow 2 days.
Qualification Certification
CE – Generator control.
EPA / EU Stage V – Engine certified for emission zones.
ISO 9001:2015 – Our Xi'an assembly.
FAQ
Q1: How does this compare to a standard diesel GPU?
A: About 10 dB quieter. A standard diesel GPU runs 78‑80 dB at 7m. This is 68 dB. That's a noticeable difference – from shouting to normal conversation.
Q2: Can I run it indoors?
A: No. Diesel engines produce carbon monoxide. Outdoor use only.
Q3: What about 90kVA? Do you make a quiet 90kVA version?
A: Yes, D‑GPU‑S90. Same noise level, same construction. Runs a 6‑cyl engine.
Q4: How often does the acoustic foam need replacing?
A: In normal use, five years. In oily environments (leaking engine), sooner. We sell replacement kits.
Q5: Lead time from Xi'an?
A: 6‑8 weeks. The acoustic enclosure is custom‑built.
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