800 kVA Generator
Equal to 640 kW. Cummins, Baudouin & Perkins engines, open and silent, with fuel use and dimensions compared.
Getting to Know 800 kVA Generators
An 800 kVA generator is about 640 kW at a power factor of 0.8, between the mid and large classes. It suits facilities with a large load that do not yet need a 1000 kVA unit.
This class offers Cummins, Perkins and Baudouin engines, with fuel use and dimensions compared directly in the table.
Suited to
- Hospitals
- Factories
- Malls & shopping centres
- Data centres (backup)
- Large construction projects
Prime or Standby?
Main power
800 kVA prime
- The generator is the main power source, for example at a site without grid power
- It runs long hours every day with a varying load
e.g. BJPS-800-WP
Grid backup
800 kVA standby
- The generator only runs during grid outages
- Prime slightly below 800 kVA, standby around 800 kVA: usually more economical
e.g. CJPS C-725 WP
800 kVA Generator Options
Every JERBINDO 800 kVA model by engine brand. Select a model for full specifications.
Cummins engine
Fuel at 75% (prime): 132 L/hr3 models
| Model | Prime kVA | Standby kVA |
|---|---|---|
| CJPS C-800 WPKTA38-G2B800 kVA prime | 800 | 880 |
| CJPS O-800 WPQSK23-G3800 kVA prime | 800 | 880 |
| CJPS C-725 WPKT38-GA800 kVA standby | 725 | 797.5 |
Baudouin engine
1 models
| Model | Prime kVA | Standby kVA |
|---|---|---|
| BJPS-800-WP8M33G900/5800 kVA prime | 800 | 900 |
Perkins engine
Fuel at 75% (prime): 130 L/hr1 models
| Model | Prime kVA | Standby kVA |
|---|---|---|
| PJPS-800 WP14006-23TAG3A800 kVA prime | 800 | 880 |
Generator Room Requirements
General guidance for the 800 kVA class from engine and generator makers' installation manuals. Final figures follow the installation drawings and datasheet of the chosen unit.
- Minimum room, 1 unit
- 7.5 × 4.9 m
- Open type (L × W × H)
- 3925–4450 × 1730–1865 × 2020–2290 mm
- Silent canopy (L × W × H)
- 5600–6100 × 2100–2440 × 2595–3150 mm
Service clearance
1.5 m per side
- Leave at least about 1.5 m of clear space on every side of the generator for maintenance (Cummins' guide for units from 100 kVA; other sources give 0.9–1.2 m), plus room above it to open panels. With the largest open unit in this class, one generator needs a room of at least about 7.5 × 4.9 m.
- When installing more than one unit, leave about 2 m between generators.
Ventilation
Outlet ≈ 1.5× radiator
- Provide an air inlet behind the generator and an outlet in front of the radiator. As a general guide, the outlet is about 1.5× the radiator core area and the inlet 1.5–2× (louvres cut the free area by about 25%). Keep the room no more than about 7–10 °C above outdoor air; above 40 °C the generator needs derating.
- Fit a duct adaptor from the radiator to the outlet so hot air does not circulate back into the room.
Foundation
≥ 2× unit weight
- A concrete foundation of at least about 2× the generator's weight, extending 150–300 mm beyond the skid on every side, with vibration isolators between the skid and the foundation. Let the concrete cure for 28 days before loading. Dry weight of the open units in this class: 5.4–7.9 tonnes.
Day tank
1040–1060 L / 8 hours
- Fuel use at 75% load: 130–132 L/hr, or about 1040–1060 L for 8 hours of running. Size the day tank from this; for longer running add a bulk tank with a transfer pump.
- NFPA 37 limits a tank inside the generator room to 2,500 L unless it has its own fire-rated room; local regulations also apply.
Exhaust
Backpressure ≤ datasheet
- A flexible connector at the engine outlet; pipework supported on its own so it does not load the engine, insulated and fitted with a rain cap. Choose the pipe and silencer so backpressure stays within the engine datasheet limit; avoid long runs and many bends. Discharge away from the air inlet.
Configuration
Open · Silent · Mobile
- Open units for a generator room; silent canopy units for outdoors.
- For higher reliability, several 800 kVA units can run in parallel with a synchronizing panel.
Generator Projects Around 800 kVA
Projects from our project list with units of around 800 kVA.
Frequently Asked Questions
How much does a 800 kVA generator cost?
The price of a 800 kVA generator depends on the engine brand, the configuration (open type, silent canopy, silent mobile), an ATS/AMF or synchronizing panel, installation and commissioning, the delivery location, and the warranty and after-sales service. Use Request a Quote with your requirements and our sales team will send a quotation.
How many kW is a 800 kVA generator?
At the 0.8 power factor commonly used for generators, 800 kVA equals 640 kW. The exact kW of each model is on its specification page.
How much diesel does a 800 kVA generator use?
At 75% load, the 800 kVA prime generators in our catalogue use about 130–132 L/hr, depending on the engine brand and model. Fuel use at 50% and 100% load is on each model's page.
Should I choose 800 kVA prime or standby?
Choose a 800 kVA prime model if the generator is the main power source or runs long hours with a varying load. If you need 800 kVA only as backup during grid outages, a model with a 800 kVA standby rating (and a slightly lower prime rating) is usually enough and more economical.
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