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Generator sizing tool
What size generator do you need?
Add the equipment you want to run. The tool totals your running load, allows for motor starting, and recommends a standard generator size.
Step 1 — Add equipment
Step 2 — Adjust quantities
| Equipment | Qty | kW each | Total kW | Remove |
|---|
Motor starting method
Not sure? Leave on Direct — it's the safe assumption.
Spare capacity
Headroom for future loads and efficient running.
How the tool works
The method, in plain terms.
Running load
We add up the rated power of everything you plan to run at the same time, in kilowatts (kW).
kW to kVA
Generators are rated in kVA. We divide kW by a power factor of 0.8 — the standard rating for three-phase diesel generator sets.
Motor starting
Motors (AC compressors, pumps, lifts) draw several times their running current at start-up. We add the start-up surge of the largest motor on top of the running load, based on the starting method you select.
Spare capacity
We add your chosen margin to the running load, take whichever is higher — that or the starting requirement — and round up to the next standard generator size.