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We offer FREE UK Mainland delivery for orders over £50! (EX VAT exclusions apply).
We offer FREE UK Mainland delivery for orders over £50! (EX VAT exclusions apply).
No Stock (Due back into stock on the 4th November 2026)
Quote Ref: @142747
Product ID: HY3900Si
Manufacturer: Hyundai
Warranty: Click here for info
3 YEAR WARRANTY for all portable power products except:
2 YEAR WARRANTY for Air Compressors, Welders, Robotic Lawnmowers
2 YEAR WARRANTY for all 1500rpm Diesel Generators, subject to service records and maximum 500h/year (See separate warranty terms).
1 YEAR WARRANTY on all 3000rpm air-cooled diesel products, maximum 1000h.
All of the Hyundai products are covered by a manufacturers warranty covering both faulty materials and faulty workmanship, it does not cover general wear and tear or damage. This excludes products or parts of products that are consumables or that become faulty to due to general wear and tear.
In terms of a faulty item being replaced, fixed or refunded, Hyundai Power Equipment is only a reseller of any goods or services received through our website, therefore an individual product's warranty would be subject to the supplier's terms and conditions and will be maintained by the company of origin. Hyundai Power Equipment will be happy to help you contact those companies who will maintain your products individual warranty, however, we are not responsible for any product directly.
Price: (£432.16 ex VAT) £518.59 (inc VAT)
518.59 2026-11-26When a 2kW generator is not quite enough for your setup, the next step up matters. The Hyundai HY3900Si delivers 3.3kW / 3300W maximum output and 3kW / 3000W continuous from a 144cc four-stroke engine. That extra headroom means you can run a caravan fridge, charge multiple devices, power lighting and still have capacity left over. The pure sine wave output keeps sensitive electronics safe, while the ECO mode stretches your fuel when full power is not needed. At 21.15kg, it is still portable enough for one person to move.
With 3.3kW max output, the HY3900Si handles combinations that smaller generators cannot. Run a fridge, charge your devices and power lighting simultaneously without worrying about overload. Ideal for larger caravan and motorhome setups.
The inverter technology produces stable electricity with low harmonic distortion. Connect laptops, televisions, games consoles and other sensitive electronics with confidence.
When you are drawing less than full load, ECO mode automatically reduces engine speed, reducing noise and giving better fuel economy. This extends the runtime in between refueling.
The HY3900Si features a 16A industrial blue socket for connecting equipment that draws more than a standard connection. The 3-in-1 digital meter lets you monitor output in real time.
| Model | HY3900Si |
| Product Type | Inverter Generator |
| Start Method | Recoil Start |
| Maximum Output | 3300W |
| Continuous Output | 3000W |
| Voltage | 230V |
| Frequency | 50Hz |
| Plug Socket Type | UK socket |
| Engine Type | 4-stroke, air-cooled, single-cylinder |
| Engine Size | 144cc |
| Fuel / Power Source | Petrol |
| Fuel Tank Capacity | 4L |
| Engine Oil | SAE 10W30 |
| Engine Oil Capacity | 400ml |
| Control Panel | 1x 16A industrial blue socket, 1x cigarette lighter, 3-in-1 digital meter, ECO mode, AC Reset |
| Inverter Type | Pure Sine Wave |
| Phase | Single |
| ECO Mode | Yes |
| Net Weight | 21.15kg |
| Gross Weight | 22.65kg |
| Assembled Dimensions (H x W x L) | 490 x 460 x 285mm |
| Package Dimensions (H x W x L) | 550 x 525 x 325mm |
| Run Time @ 10% Load | 6.3 hours |
| Run Time @ 50% Load | 3.6 hours |
| Fuel Consumption @ 50% Load | Approx. 1.11 L/hr |
| Noise Level db (A) @ 10% Load with 7m | 60 dBA |
| Noise Level db (A) @ 50% Load with 7m | 63 dBA |
| Marked Sound Power Level | 95 dBA |
| CE Sound Power Level (LWA) | 93.5 dBA |
| Warranty | 3 years home use, 1 year commercial, 90 days hire, max 1,000 hours |
Brand: Hyundai
Identifier: HY3900Si
Brand new packaged items only.
Comes with a full manufacturer warranty (not including consumable products).
Please make use of any product reviews or youtube clips we have available to learn more about the item.
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Order with an official purchase order by emailing [email protected]. We will check your account status or if you do not hold an account we will credit check your organisation, confirm and process your order. Please note the first order(s) will always need to be paid upfront unless you are a government linked organisation. Goods remain the property of Sitebox Ltd until paid for in full as per our full terms and conditions.
3 YEAR WARRANTY for all portable power products except:
2 YEAR WARRANTY for Air Compressors, Welders, Robotic Lawnmowers
2 YEAR WARRANTY for all 1500rpm Diesel Generators, subject to service records and maximum 500h/year (See separate warranty terms).
1 YEAR WARRANTY on all 3000rpm air-cooled diesel products, maximum 1000h.
All of the Hyundai products are covered by a manufacturers warranty covering both faulty materials and faulty workmanship, it does not cover general wear and tear or damage. This excludes products or parts of products that are consumables or that become faulty to due to general wear and tear.
In terms of a faulty item being replaced, fixed or refunded, Hyundai Power Equipment is only a reseller of any goods or services received through our website, therefore an individual product's warranty would be subject to the supplier's terms and conditions and will be maintained by the company of origin. Hyundai Power Equipment will be happy to help you contact those companies who will maintain your products individual warranty, however, we are not responsible for any product directly.
