A diesel generator is a long-term investment in the continuity of your operations. Whether you run a manufacturing plant, a hospital, a data center or a construction site, the right generator keeps your facility powered when the grid cannot. Here are the key factors our specialists recommend considering before you buy.
1. Calculate Your Power Requirement
Start by listing every load the generator must support — machinery, lighting, HVAC, servers and safety systems. Add the starting (surge) currents of motors and compressors, which can be three to six times their running load. The total, measured in kVA, determines the generator size. As a rule of thumb, choose a unit rated around 20% above your calculated peak demand so the engine never runs continuously at full load.
2. Prime Power vs Standby Power
A standby (backup) generator runs only during outages and is rated for limited hours per year. A prime power generator is designed for continuous or extended operation — essential for sites without reliable grid access. Choosing the wrong rating shortens engine life and can void warranties, so be clear about your duty cycle from day one.
3. Engine and Alternator Quality
The engine and alternator are the heart of the set. Proven engines such as Perkins, Cummins and Volvo, paired with Stamford or Meccalte alternators, deliver better fuel efficiency, easier maintenance and worldwide parts availability. UK-manufactured sets built to international standards offer the most dependable long-term value.
4. Canopy, Noise and Environment
For outdoor or residential-adjacent installations, a soundproof weather canopy protects the set and keeps noise within local limits. Consider ambient temperature, altitude and dust levels too — these affect derating and cooling requirements.
5. Parts, Service and Support
Even the best generator needs filters, belts and routine servicing. Choose a supplier who stocks genuine spare parts and can support you after the sale — not just ship a crate.
Need help sizing a generator? Feblet Technologies designs, supplies and manufactures diesel generators in the UK and ships internationally. Contact our team for a free consultation, or browse our diesel & gas generators.