PRP: 20 kW / 25 kVA
Standby: 22 kW / 27.5 kVA
Engine: 4B3.9-G2
PRP: 20 kW / 25 kVA
Standby: 22 kW / 27.5 kVA
Engine: 4B3.9-G2
20 kW Prime / 22 kW Standby | Cummins 4B3.9‑G2 4‑Cylinder | 400/230V 50Hz
The smallest Cummins in the JUTOP range — 20kW with 4B3.9‑G2, 68‑70dB(A) and 1.8t chassis. Built for family farms, telecom micro‑base stations, remote retail and residential community backup. 80L tank covers an overnight shift. 500‑hour maintenance, IP23 + Class‑H insulation. Full export certifications.

· Family Farm
· Telecom Micro‑Base Station
· Remote Retail
· Residential Community
· Construction Auxiliary
· Office Building Standby
· Rural Off‑Grid Site
| Model | JT‑20KW |
| Prime / Standby Power | 20 kW / 25 kVA · 22 kW / 27.5 kVA |
| Voltage / Frequency | 400/230V · 50 Hz |
| Rated Current | 36 A |
| Engine | Cummins 4B3.9‑G2, 4‑Cyl In‑Line Turbocharged, 3.9L |
| Bore × Stroke / Compression | 102 mm × 120 mm · 18.0:1 |
| Speed / Peak Torque | 1,500 RPM · 420 N·m @1500RPM |
| Cooling / Engine Oil | Water‑Cooled · 11.4 L |
| Alternator | Brushless, Self‑exciting, H‑Class, 3‑Phase |
| Phase / Power Factor | 3‑Phase 4‑Wire · 0.8 (lagging) |
| THD / Protection | <5% · IP23 |
| Fuel Consumption | 182‑190 (50%) / 198‑206 (75%) / 214‑222 (100%) g/kW·h |
| Fuel Tank / Runtime | 80 L · ≈8‑hr @ 75% Load |
| Maintenance Interval | 500 Working Hours |
| Noise Level | 68‑70 dB(A) @ 1m |
| Max Altitude (No Derate) | ≤ 1,000 m |
| Max Parallel Units | Up to 8 Units (IEC 8528‑5) |
| ATS Compatibility | Yes |
| Dimensions / Weight | 3,000 × 1,300 × 1,800 mm · 1.8 t |
| Certifications | ISO9001 · CE · SONCAP · PVoC · NRCS · SIRIM · SNI · TISI |
| Lead Time | 30‑35 work days + 40‑50 days ocean freight |
If you are running a 20kW farm, a telecom micro‑site or a rural retail outlet, your alternative is typically a domestic‑brand engine. The JT‑20KW brings genuine Cummins 4B3.9‑G2 to this power level — factory‑verified power curves, fuel data and torque figures from the same documentation that supports larger Cummins heavy‑duty engines. Cummins at 20kW is not a down‑badge exercise; it is a genuine power platform scaled to smaller loads.
68‑70dB(A) @ 1m is the quietest generator in the JUTOP Cummins range. At this level, the JT‑20KW can run overnight beside a family farmhouse, residential community or rural clinic without noise complaints. Standard 80dB(A) 20kW units require heavy sound enclosures or large setbacks; the 4B3.9‑G2’s low‑noise design enables safe night‑time prime power use.
At 1.8 tonnes and 3.0 metres long, this is the only JUTOP Cummins unit transportable by standard flatbed pickup trucks, no cranes or heavy‑duty vehicles required. Ideal for rural telecom towers, off‑grid farms and emergency power deployments where road access is limited and logistics are challenging.
Ordinary domestic 20kW generators require 200‑250‑hour calendar‑based service intervals. The 4B3.9 engine adopts standard 500‑hour maintenance cycles based on actual operating hours. Perfect for seasonal farms and low‑use telecom micro‑sites, avoiding unnecessary service visits when the unit is rarely operated.
The 4B3.9 engine is widely applied across construction, agriculture and marine sectors worldwide, with spare parts easily accessible in Africa, Southeast Asia and Latin America. It effectively solves the long lead time of parts supply for generic engines, ensuring stable operation for numerous scattered small power stations.
· Factory‑direct pricing, custom solutions and global technical support available.
· Request datasheets, quotations and certification documents now.
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Shandong Jutop Heavy Industry Technology Co., Ltd. is a national high-tech heavy machinery manufacturer founded in 2013. Equipped with a 50,000㎡ workshop and over 300 professionals, we specialize in R&D and export of construction machinery, drilling rigs and generators. Boasting 200+ patents and global certifications, our products are exported to over 120 countries, dedicated to supplying reliable cost-effective equipment for worldwide clients.

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