Hyundai DHY8000SELR 5.8kW Long Run Silent Diesel Generator

Power cut at 2am? Turn the key and keep your home running until morning, and well beyond. The Hyundai DHY8000SELR pairs 5kW of continuous diesel power with a 25-litre long run tank that burns roughly a litre an hour, so you won't be refuelling in the dark. With the optional ATS, it can even start itself.

✔ Authorised UK reseller ✔ Free delivery to mainland UK ✔ Prices include VAT ✔ 1-year Hyundai warranty

Why buyers choose the DHY8000SELR

• A very long run on one tank. Up to 25 hours from 25 litres at about 1L an hour, and around 14.6 hours even at full load.
• Automatic start option. It's ATS compatible, so it can start itself when the mains fails and shut down when power returns (ATS sold separately).
• Turn-key electric start. A 12V 36Ah battery is fitted, so there's no pull cord in the cold and wet.
• Stable power. AVR keeps the voltage steady as loads switch on and off.
• Sound-reducing canopy. Quoted at 70 dB(A) at 7m and 75% load.
• 230V and 115V outlets. One machine for the home and for site tools.
• Easy to read. A digital display on the control panel, and a wheel kit for moving it on firm ground.

Is it right for you?

Ideal for: home standby power, rural properties on overhead lines, farms, workshops and small premises that need essential circuits kept live.

Look elsewhere if:

• You need power every day or for long periods daily. Hyundai recommends a 1500rpm water-cooled generator for that, so please ask us.
• You need 400V. See the DHY8000SELR-T.
• You need more power. The DHY12500SE gives 10kW continuous.
• You need a smaller machine. The DHY6000SE is the size down.
• Very close neighbours are a concern. It's quieter than an open-frame diesel, but several owners found it louder than they expected.

What will it run?

Plan around the 5kW continuous figure, not the 5.8kW maximum. These are typical running loads, so check your own appliance labels.

Example: fridge freezer, boiler, lights, router and TV come to about 650W, leaving over 4kW spare for cooking or a kettle. Start your largest motor load first.

On 115V: dual-voltage generators give only around 50 to 60% of their rated output on the lower voltage, so plan on about 2.5 to 3kW.

How long will the fuel last?

Use standard-specification diesel, and never petrol. The engine can take red or white diesel, but the rules on who can use red diesel changed in 2022, so check it's allowed for your use. One owner found the fuel gauge read empty with fuel still in the tank, so treat it as a guide.

Automatic or manual changeover?

To power your home's circuits, the generator must connect through a transfer switch fitted by a qualified electrician, so that it and the mains can never be connected together. Never feed it through a socket.

• Manual transfer switch: the simple, lower-cost route. You start the generator and turn the switch.
• Automatic transfer switch (ATS): does it all for you, which suits properties often left empty or where someone relies on continuous power. Please ask us about availability.
• ATS module: adds a 2-wire start signal if your installer is using a third-party changeover switch.

None of these is included, so ask us which suits your property.

Where to put it

• Run it outdoors on firm, level ground, at least 1m from buildings and other equipment, and well away from doors, windows and vents.
• Never run it in a garage, shed or other enclosed space, or with a cover on it.
• Protect it from rain and flooding without blocking the airflow. Water damage isn't covered by the warranty.
• Earth it at the main earth point, as the manual describes.

Getting it running

• Delivery: it weighs 167kg packed and arrives on a pallet, so have a pallet truck ready. Report any transit damage to us straight away.
• Connect the battery. Owners report a terminal being disconnected for transit, and it won't start until that's fixed.
• Add engine oil. It takes 1.65L. Don't rely on what's in the sump, as it may have very little. Genpower recommends SAE 15W-40 diesel engine oil.
• Add clean diesel and bleed the fuel line as the manual describes, so that there's no air in the system.
• Start it. Don't crank for more than 10 seconds, and wait 15 seconds between attempts. Let it warm up for 5 minutes the first time, and 2 minutes after that, before applying any load.
• Run it in. Avoid loads above 3kW for the first 20 hours.
• Use the right plugs. The outlets are industrial-style 16A and 32A sockets. Our 32A to 4 x 13A converter suits household plugs.
• To stop it: switch off your appliances and the main breaker, let it run with no load for 3 minutes, then turn off the key.

Keeping it ready

Keep a record of the date and hours of every service, as Hyundai can ask for it on a warranty claim. Run it regularly between power cuts so that it's ready when you need it.

Full specification

FAQs

Can it start automatically in a power cut? Yes, when paired with a compatible ATS, which is an optional extra. Without one, you start it with the key.

How quiet is it? It's much quieter than an open-frame set, but it's still a diesel engine. Some owners found it noisier than they expected, especially when new, so site it away from bedrooms and neighbours.

Why won't it start? On a new machine, check the battery terminals are connected, the oil is filled and the fuel line has been bled. It may also need bleeding if it has run out of diesel.

Can I plug in normal household appliances? Not directly. The outlets are industrial-style 16A and 32A, so you need a suitable adaptor or a transfer switch.

Can it run all day, every day? No. It's designed for standby use. For frequent or continuous power, Hyundai recommends a 1500rpm generator.

Can it back up the whole house? It will run essential circuits, but not everything at once, so an electrician should help you choose which circuits to connect.

How does the warranty work? Home and commercial use are covered for 1 year or 1,000 hours, and hire use for 90 days. Keep your proof of purchase and service records. Overloading, underloading, water or frost damage, stale or contaminated fuel, lack of servicing and modifications aren't covered.

Not sure it's the right size? Send us your appliance list at sales@generator-uk.co.uk or call 01744 520110, Monday to Friday, 8:30am to 5pm, and we'll help you size it.

Safety: run outdoors only, at least 1m from buildings and well away from doors, windows and vents. Generator exhaust contains carbon monoxide. Let the engine cool before refuelling.