Farm Irrigation Preset
Farm Irrigation preset for the Generator Load Calculator: pump start. Pre-filled inputs Running Load W 18000, Starting Load W 42000, Power Factor 0.8.
Pre-filled Inputs
Exact preset input values| Running Load W | 18000 |
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| Starting Load W | 42000 |
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| Power Factor | 0.8 |
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| Voltage | 400 |
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| Phases | 3 |
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Governing Formulas
Engineering formulas used by this calculator| Expression | Result |
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P_run = Σ (running watts × qty) | Total running load (W) |
P_surge = P_run + max(starting − running) | Peak surge (W) |
kW = max(P_run × 1.25, P_surge × 1.10) / 1000 | Recommended kW |
kVA = kW / power factor | Apparent power (kVA) |
Frequently Asked Questions
- How do I size a standby generator?
- Total the running watts of every connected load, add the largest motor starting surge, then take the greater of running load × 1.25 or surge × 1.10.
- Why does motor starting surge matter?
- Motors draw several times their running current at start-up, so the sizing uses the largest single starting delta rather than the sum of all surges.
- What power factor should I use for kVA sizing?
- Use the nameplate power factor of the connected equipment; motor-heavy loads commonly run 0.8, which raises the apparent power in kVA for the same kW.
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