What size do you need?

kVA or kW?

kVA measures what the alternator can deliver; kW measures what your equipment actually uses. For a three-phase set, 1 kVA is usually counted as 0.8 kW (a power factor of 0.8). A 100 kVA set therefore delivers 80 kW.

Prime or standby power?

Prime power is what the set can deliver continuously, for as long as needed, with a load that varies. Standby power is a little higher, but meant for grid outages and for a limited time.

If the set will run for long hours every day, choose it by its prime power.

Estimate your need in four steps

1. List the equipment that runs at the same time and note its power (on its rating plate, in W or kW).

2. Motors (pumps, lifts, air conditioners, compressors) draw several times their power when they start: count them separately.

3. Add a 20 to 25% margin so the set does not run at full load.

4. Divide the total in kW by 0.8 to get kVA, and choose the next size up.

An example

A small building uses 30 kW at peak times: lighting, a lift, a water pump and a few air conditioners. With a 25% margin that makes 37.5 kW, or 47 kVA. The right set is the 60 kVA PK060‑LS, which also leaves room to start the lift and the pump.

Diesel set or inverter generator?

An inverter generator (2.5 to 5 kW, single-phase) suits small needs: an office, a shop, computers, home appliances. Its power is very stable for electronics.

As soon as you need three-phase power, long running hours or several homes, a diesel set is the answer.

Where to install the set

Plan a flat, solid base, air for the radiator, access for servicing and refuelling, and an exhaust outlet away from windows. MAINZ canopies are soundproof (75 to 79 dB(A) at 3 m), which makes it easier to install them near buildings.