Gorilla Power GP12800DE Diesel Generator Review: Maximum Power for Large Mobile Catering Operations

The GP12800DE is the biggest generator in the Gorilla Power range — and it is a fundamentally different machine from everything else we sell. Where the rest of the lineup runs on petrol (or dual fuel petrol/propane), the GP12800DE runs on diesel. Where the suitcase generators produce 2,000-3,500W, this produces 12,800W peak. It exists for one reason: powering large mobile catering operations where multiple high-draw electric appliances run simultaneously and nothing else in the range has enough capacity. For a comparison of all generators, see our complete generator buying guide.

Important context: most mobile caterers do not need 12,800 watts. If your cooking runs on LPG and you need electricity for a coffee machine, fridge, lights, and till, a 3,000-3,500W inverter handles it. The GP12800DE is for operations that have outgrown everything else — large event caterers, multi-unit trailer setups, or businesses running primarily electric cooking equipment.

GP12800DE Key Specifications

Note: full technical specifications (fuel tank capacity, weight, dimensions, noise level) should be confirmed with the manufacturer or at the point of purchase. The figures above are based on available product data.

Why Diesel? The Case for a Diesel Generator in Mobile Catering

Most mobile catering generators run on petrol or propane. Diesel is the exception — and at this power level, it makes sense for specific reasons:

1. Fuel efficiency at high loads. Diesel engines extract more energy per litre than petrol engines. At 50-75% load over an 8-hour trading day, a diesel generator burns less fuel than a petrol equivalent producing the same power. When you are consuming 20+ litres per day, that efficiency difference saves real money over a season.

2. Longer engine life. Diesel engines are built heavier and run at lower RPM than petrol generators. They are designed for sustained, heavy-duty use — exactly what a large mobile catering operation demands. Where a petrol generator might last 2,000-3,000 hours before needing a major service, a diesel can run 5,000-10,000 hours.

3. Fuel availability and storage. Diesel does not go stale as quickly as petrol. If you trade seasonally (events, summer festivals, Christmas markets), diesel sits in the tank between seasons without the gumming problems that plague petrol carburettors. You also never need fuel stabiliser.

4. Lower fire risk. Diesel is less flammable than petrol — its flash point is significantly higher. In a mobile catering environment with LPG cylinders and hot cooking equipment nearby, this is a safety advantage.

What Can 12,800W Power?

At this power level, the question becomes “what can’t it power?” Here is a maximum-spec mobile catering setup:

Two coffee machines, an oven, a microwave, two fridges, a waffle maker, full lighting, sound system, and payment terminals — all running simultaneously at 12,400W. That is the kind of setup you see at large festivals, corporate events, and multi-day shows where you are serving hundreds of covers per day.

For a standard single-van operation with LPG cooking, the GP12800DE is massively oversized. Its sweet spot is:

• Large event catering trailers with multiple cooking stations
• Multi-van operations where one generator powers two or more units
• Primarily electric cooking — induction hobs, electric ovens, electric fryers
• All-day event power — festivals, shows, markets where you need guaranteed, uninterrupted supply

GP12800DE vs Petrol/Propane Alternatives

Who Is the GP12800DE For?

Ideal for:

• Large-scale event caterers — festivals, county shows, corporate events where you serve 500+ covers per day across multiple stations.
• Multi-unit operators — powering two or three vans from a single generator, with a distribution board splitting the supply.
• Electric-first cooking setups — if you have moved away from LPG to induction hobs and electric ovens, you need this kind of capacity.
• Professional caterers who trade 300+ days per year — the diesel engine’s longevity and fuel economy pay for themselves over high-usage seasons.

Not ideal for:

• Single-van LPG operations — if your cooking runs on propane and you need 1,000-5,000W of electrical power, this is overkill. A GP3500i, GP5500E-DF, or GP8000iE is more appropriate.
• Traders who need portability — diesel generators at this power level are heavy and require permanent mounting or a dedicated trailer.
• Sensitive electronics without protection — the GP12800DE is a conventional (non-inverter) generator. If you run sensitive equipment, add an inline power conditioner or use a separate small inverter generator for electronics.

Diesel Generator Maintenance

Diesel generators need different maintenance from petrol models:

Fuel quality matters: always use clean diesel from a reputable source. Dirty or contaminated fuel damages injectors and can cause costly repairs. If buying red diesel (where legally permitted for your use case), ensure it comes from a supplier with good storage practices.

Frequently Asked Questions

Can I use red diesel in the GP12800DE for mobile catering?

Red diesel (rebated fuel) is significantly cheaper than white diesel but has strict legal restrictions on its use. Since April 2022, HMRC tightened the rules — red diesel is no longer permitted for most commercial purposes outside agriculture, horticulture, and a few specific sectors. Mobile catering is not an exempt use. You must use standard white (road) diesel. Using red diesel illegally carries heavy fines. Always check current HMRC guidance for your specific situation.

Is 12,800 watts too much for a single food van?

For most single food vans running LPG cooking equipment, yes — it is significantly oversized. A typical LPG-based van draws 600-3,000W electrically. The GP12800DE makes sense for large trailers with multiple electric cooking stations, multi-van setups, or primarily electric (non-LPG) cooking operations. Oversizing your generator wastes fuel and money.

How loud is the GP12800DE?

The GP12800DE uses an enclosed silenced cabinet, which keeps noise lower than an equivalent open-frame generator. However, a 12,800W diesel engine is inherently louder than smaller petrol inverters. Expect it to be audible but not disruptive in an outdoor catering environment. Position it as far from your serving area as your cabling allows.

What are the running costs compared to petrol generators?

Diesel is typically cheaper per litre than petrol, and diesel engines are 15-25% more fuel efficient at similar power outputs. Over a 300-day trading year at 8 hours per day, the fuel savings compared to a petrol generator are substantial. The diesel engine also lasts 2-3× longer before needing major service, reducing long-term maintenance costs.

Does the GP12800DE produce clean power for electronics?

The GP12800DE is a conventional generator, not an inverter. Its power output has more harmonic distortion than an inverter model. For most mobile catering equipment — fridges, lights, ovens, microwaves — this is fine. For sensitive electronics (card machines, laptop tills, electronic coffee machine controls), add an inline power conditioner (£30-50) or run a small separate inverter generator for your electronics.

Can I power two food vans from one GP12800DE?

Yes, with proper planning. Two typical LPG-based food vans drawing 2,000-3,000W each would use 4,000-6,000W combined — well within the 12,000W continuous rating. You need a distribution board with individual circuit breakers for each van. Have a qualified electrician set up the distribution to ensure safety and balanced loading.

What is the warranty on the GP12800DE?

Warranty terms should be confirmed at the point of purchase. Diesel generators typically come with a manufacturer warranty covering defects in materials and workmanship. The warranty does not cover wear items, damage from contaminated fuel, or failure to follow the maintenance schedule. Keep your purchase receipt and service records.