Genset Installation Checklist: Site Prep, Earthing & Ventilation

Two gensets with identical specs, installed by different teams, can perform completely differently — and it's rarely the machine's fault when one underperforms.

An overheating shutdown after 20 minutes of load looks like an engine or cooling-system fault. Often it's a radiator with 18 inches of clearance instead of the 3+ feet the airflow rating actually needs, recirculating its own hot exhaust air back into the intake. The fix isn't a repair — it's moving the unit or opening up the room. Getting the site prep right before commissioning avoids this category of problem entirely.

The unit needs a level, adequately rated foundation — concrete pad sized to the model's footprint and weight, per the manufacturer's installation drawing. An unlevel base causes uneven vibration wear over time and can affect oil pickup in some engine orientations. This is usually handled correctly by an experienced installer, but worth confirming against the actual spec sheet rather than assuming "flat enough."

The radiator needs unobstructed intake and a clear path for hot exhaust air to leave — recirculating hot air back into the intake is one of the most common causes of load-related overheating trips. As a rough rule of thumb, plan for at least a meter of clearance around the unit, more on the radiator side, and confirm against the model's specific airflow requirement rather than treating any single number as universal.

Exhaust needs to be routed fully outside, away from any window, door, or air-conditioning intake — both for the obvious carbon monoxide safety reason and because recirculated exhaust fumes back into a building are a serious health hazard, not just an odour nuisance. In basement installations especially, confirm the exhaust run terminates somewhere it genuinely can't re-enter occupied space or intake vents, including on neighbouring buildings.

A genset typically needs its own dedicated earth pit(s), separate from the building's existing electrical earth — commonly body earthing and neutral earthing run as two separate pits, per standard practice and the installer's specific recommendation for your setup. This is the item most often skipped or under-specified on smaller installations, and it's a safety system, not a formality — get it confirmed by whoever's doing the electrical tie-in, not assumed.

Fuel tank placement and line routing should follow the manufacturer's guidance and local fire safety norms — this covers things like minimum distance from ignition sources and containment for any spill. For larger sets with external bulk tanks, this is very much a specialist installation question, not a DIY judgment call.

If the site is anywhere near occupied residential or office space, confirm before installation whether an acoustic canopy is a compliance requirement rather than a preference — this is a much easier decision to make before the unit arrives than after a neighbour complaint.

Site prep and electrical tie-in should be confirmed by the installing dealer or a qualified electrical contractor — not treated as a DIY task, even for smaller commercial sets. Most reputable dealers include a site-readiness check as part of the sale; ask for one explicitly if it isn't offered. Find an installer through our dealer directory if you're sourcing one for a new installation.