A practical installation guide from someone who has supervised generator installations on rooftops in Lagos, in basements in Manila, and on mountaintops in Ethiopia. Some things only experience can teach you.

Buying the right generator is only half the battle. I have seen perfectly good Yuchai units reduced to expensive paperweights because the installation was botched — bad foundations, undersized cables, missing ventilation, or fuel lines that leaked from day one.

A proper installation is not difficult, but it requires attention to detail at every step. Skip one critical item and you will pay for it later. This guide covers everything from site preparation through commissioning, based on the installation standards Tesla Power uses on every project.

Safety First: Generator installation involves high-voltage electrical work, heavy lifting, fuel handling, and exhaust systems. This guide is for planning and understanding the process. All electrical work must be performed by a licensed electrician. Fuel system installation must comply with local fire codes. Always follow the manufacturer’s installation manual.

Pre-Installation: Planning and Site Assessment

Before any equipment arrives on site, you need to answer several critical questions. Rush this phase and everything that follows becomes more difficult and expensive.

1

Choose the Installation Location

• Outdoor installations: Preferred for most applications. Better ventilation, easier exhaust routing, less noise concern. Requires weather protection (canopy or shelter).
• Indoor installations: Used when space, security, or noise requirements demand it. Requires engineered ventilation system, exhaust ducting through the building, and often acoustic treatment.
• Rooftop: Possible but requires structural engineering assessment. The generator, fuel tank, and foundation can weigh 3,000-15,000 kg depending on size. Not all buildings can handle this.

Key factors: distance from the main electrical panel (shorter cable runs save money), accessibility for maintenance and fuel delivery, noise proximity to occupied spaces, and flood risk.

2

Prepare the Foundation

The generator needs a flat, level, vibration-dampened surface. For permanent installations, this means a reinforced concrete pad:

ParameterSpecification
Concrete gradeC25-C30 minimum (with steel reinforcement)
Pad sizeGenerator footprint + 300mm clearance on all sides
Thickness150-250mm (depending on unit weight)
Surface finishSmooth, level (within 3mm over full length)
Vibration isolationSpring or rubber isolator mounts between pad and generator
DrainagePad should slope slightly (1-2%) for water runoff

The pad must be allowed to cure for a minimum of 14 days before the generator is placed on it. Tesla Power provides detailed foundation drawings for every generator model we supply.

Phase 1: Mechanical Installation

3

Position and Secure the Generator

• Use appropriate lifting equipment — rated for at least 1.5x the generator weight. Lift points are clearly marked on the canopy or base frame.
• Position the generator on vibration isolator mounts pre-installed on the foundation.
• Level the unit precisely using shims if necessary.
• Secure with anchor bolts and torque to specification.
• Verify adequate clearance: minimum 1 meter on all sides for maintenance access, 2 meters from walls or other equipment for airflow.

4

Connect the Exhaust System

Exhaust installation is critical for safety and performance:

• Use flexible exhaust connectors between the engine and the exhaust pipe to absorb vibration.
• Size the exhaust pipe to match or exceed the engine outlet diameter — never smaller.
• Minimize bends (each 90-degree bend adds backpressure equivalent to 2-3 meters of straight pipe).
• Install a rain cap at the exhaust outlet.
• Insulate the exhaust pipe if it passes near combustible materials or occupied spaces (surface temperature can exceed 400 degrees Celsius).
• Route the exhaust outlet away from air intakes, windows, and building entrances.

Common mistake: Undersized exhaust pipe. This increases backpressure, reduces engine efficiency, and can increase diesel generator fuel consumption by 3-8%. Always follow the manufacturer’s exhaust specification.

5

Install the Fuel System

The fuel system needs more attention than most people realize:

• Day tank (base tank): Most Yuchai generators from Tesla Power include an integral base tank with 8-12 hours of runtime capacity. This is the primary fuel supply.
• Bulk tank: For installations requiring extended runtime, install a bulk fuel tank with automatic transfer pump to keep the day tank full.
• Piping: Use steel or copper piping for fixed installations. Flexible hoses only for the final connections to the engine to allow for vibration.
• Filtration: Install a water separator and fuel filter in the supply line before the engine. Consider a fuel polishing system for continuous fuel quality maintenance.
• Return line: The fuel return line from the engine must be properly routed back to the tank.

Fire safety: Fuel tank must be grounded/bonded to the generator frame and the building grounding system. Install a fuel shutoff valve accessible from outside the generator room. Maintain minimum 1 meter clearance between the fuel tank and any ignition source. Check local fire codes for additional requirements.

6

Install the Cooling and Ventilation System

Proper airflow is essential. A diesel engine needs massive volumes of cooling air — and it needs to exhaust hot air effectively.

• Ensure radiator airflow is unobstructed. The generator must be positioned so that the radiator faces an open area — not a wall, fence, or another unit.
• For indoor installations, calculate the required ventilation area: typically 1.5-2 square meters of free air opening per 100 kW of generator capacity.
• Install intake louvers on one side of the room and exhaust fans on the opposite side to create cross-ventilation.
• Ensure room temperature does not exceed the generator’s rated ambient temperature (typically 40-50 degrees Celsius for Tesla Power units).

Phase 2: Electrical Installation

7

Run Power Cables

The cable sizing calculation is one of the most critical parts of the electrical installation:

Cable Sizing Factors:

• Current capacity (amps) based on generator output
• Voltage drop — should not exceed 3% over the cable run
• Distance from generator to the main distribution board
• Number of cable runs (single vs. parallel)
• Installation method (in conduit, in tray, direct burial)
• Ambient temperature derating

For a 200 kVA (160 kW) generator, typical cable sizes are 95mm2 or 120mm2 copper per phase for runs under 30 meters. For longer runs, larger cables or multiple parallel runs may be needed.

• Use copper conductors — never aluminum for generator output cables.
• Install in proper conduit or cable tray with physical protection.
• Label all cables clearly at both ends.
• Install an output circuit breaker (usually included with the Tesla Power generator package).

8

Install the Automatic Transfer Switch (ATS)

The ATS is the brain of your backup power system. It monitors the utility supply and automatically starts the generator when power fails:

• Install the ATS between the utility meter and the main distribution board.
• Ensure proper switching configuration — the ATS must transfer both live and neutral for safety.
• Configure the transfer time: typically 10-30 seconds for standard applications, less than 10 seconds for critical facilities.
• Wire the ATS control inputs from the generator controller (DSE controller on Tesla Power units).
• Test the ATS operation as part of commissioning.

9

Grounding and Earthing

• Install a proper earth electrode system (earth rods, earth grid, or earth ring depending on site conditions).
• Connect the generator frame, alternator neutral, and all metallic enclosures to the earth system.
• Earth resistance should be below 5 ohms (below 1 ohm for sensitive installations like hospitals and data centers).
• Use the correct earth conductor size — typically half the phase conductor size or as calculated by a qualified electrical engineer.

Phase 3: Commissioning

10

Pre-Start Checks and Commissioning

Before the generator runs for the first time, verify:

• All mechanical connections tight and secure
• Engine oil at correct level
• Coolant at correct level and concentration
• Fuel system primed and free of air
• Battery charged and connections clean
• All electrical connections verified by megger test (insulation resistance test)
• ATS wiring verified and control signals tested
• Exhaust system checked for leaks
• Fire extinguisher placed near the generator
• Emergency stop button tested and functional
• All warning labels and operating instructions posted

11

Initial Run and Load Testing

This is where theory meets reality:

1. Start the generator and allow it to run at no load for 10-15 minutes. Check for leaks, unusual noise, and proper oil pressure and coolant temperature.
2. Apply load in steps (25%, 50%, 75%, 100%). Verify stable voltage and frequency at each step.
3. Run at full load for a minimum of 1-2 hours (longer if possible). Monitor all parameters continuously.
4. Record voltage, current, frequency, power factor, oil pressure, coolant temperature, and fuel consumption at each load step.
5. Test the ATS transfer function: simulate a power failure and verify the generator starts and transfers load within the specified time.
6. Verify all protection functions: overcurrent, over/undervoltage, over/underfrequency, high temperature, low oil pressure.

Document all test results in a commissioning report. Tesla Power provides a standard commissioning checklist and test report template with every installation.

Common Installation Mistakes to Avoid

After supervising installations for over a decade, here are the mistakes I see repeatedly — and how to avoid them:

• Undersized cables: Causes excessive voltage drop, overheating, and potential fire. Always use a qualified engineer for cable calculations.
• Insufficient ventilation: Causes the engine to overheat and derate. I have seen generators lose 15-20% of their rated power because the generator room was too small or poorly ventilated.
• Exhaust routed near the air intake: The engine inhales its own exhaust, leading to carbon buildup, reduced power, and potential shutdown.
• No fuel filtration beyond the engine filter: A single clogged filter can shut down the entire generator. Add a pre-filter/water separator in the fuel line.
• Forgetting vibration isolation: Without proper mounts, vibration cracks exhaust pipes, loosens electrical connections, and can even damage the building structure over time.
• Not testing the ATS before leaving site: I have been called back to too many sites where the ATS was wired incorrectly and the generator never started during the first actual power outage.

Tesla Power Installation Services

Tesla Power offers comprehensive installation support because we know that even the best generator performs poorly with a bad installation:

• Site survey and assessment: We evaluate your proposed location, calculate cable sizes, ventilation requirements, and fuel system design before anything is ordered.
• Installation drawings: Detailed foundation plans, electrical single-line diagrams, and fuel system layouts tailored to your site.
• Installation supervision: Our engineers can supervise your local contractors to ensure everything is done correctly.
• Full turnkey installation: In our service regions, we can handle the complete installation from civil works through commissioning.
• Commissioning and testing: Comprehensive load testing, ATS verification, protection system testing, and operator training.
• Product range: 16 kW to 1,000 kW Yuchai-powered generators, all configurations available.

Frequently Asked Questions

How much space do I need to install a Yuchai diesel generator?

As a minimum, allow 1 meter of clearance on all sides of the generator for maintenance access, and 2 meters between the generator and any wall or obstruction facing the radiator. For a typical 200 kVA soundproof canopy unit (approximately 3.5m x 1.4m x 1.9m), you need a pad of at least 4.5m x 3.5m. For indoor installations, the room must also accommodate ventilation openings and personnel access.

Can I install a diesel generator indoors?

Yes, but indoor installations require careful engineering. You need adequate ventilation (both intake and exhaust air), exhaust ducting to outside, fuel containment, fire suppression, and acoustic treatment. The room must be designed to prevent any possibility of exhaust gases entering occupied spaces. Tesla Power provides indoor installation design services and can recommend qualified contractors in your area.

What size cable do I need for a 200 kVA generator?

For a 200 kVA generator at 400V three-phase, the full-load current is approximately 289 amps per phase. For cable runs under 30 meters, 95mm2 copper cable is typically adequate. For longer runs (30-60 meters), use 120mm2 or 150mm2 to keep voltage drop under 3%. Always have a qualified electrical engineer perform the actual calculation for your specific installation, considering installation method, ambient temperature, and grouping factors.

How long does a generator installation take?

For a straightforward outdoor installation of a 100-300 kVA unit with existing site infrastructure (foundation ready, electrical panel nearby), expect 2-4 days for the mechanical and electrical installation plus 1 day for commissioning and testing. Total project timeline including site preparation, equipment delivery, and documentation is typically 4-8 weeks. Complex installations (indoor, multi-unit, critical facility) can take 8-16 weeks.

Do I need planning permission to install a generator?

In most jurisdictions, yes — particularly for permanent installations, fuel storage, and indoor locations. Requirements vary by country and even by municipality. Common requirements include building permits, fire department approval for fuel storage, environmental permits for exhaust emissions, and noise compliance certificates. Tesla Power can advise on typical requirements for your region, but always check with local authorities before beginning installation.

About the Author: This installation guide reflects the author’s experience supervising diesel generator installations across Africa, Asia, and the Middle East — from simple outdoor pad mounts to complex indoor paralleled systems in critical facilities. The recommendations align with Tesla Power installation standards and applicable international codes. For project-specific installation support, contact Tesla Power.