GENSET SIZING
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| Generator Set Sizing Worksheet |
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| Load Step # | 1 | |||||||||||||||
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| Individual Load Characteristics |
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| Load Step Totals |
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| SkVA | SkW |
| RkVA |
| RkW |
| GkW | QTY | skVA | skW | RkVA | Rkw |
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Load |
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| Enter RkW total from previous load step | — |
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Enter RkVA, RkW, and GkW totals from previous load step | — |
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1. | 377.6 | a | 113.3 | b |
| 89 | d |
| 81.9 | c |
| 81.9 | e | 2 | 755.- | 228 | f | 178 | f | 163.8 | f |
| 163.8e- |
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3. | — |
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| 5 10. g | 10g | 10.5g | 10g |
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| Load Step Totals | 765.7 | 238 | 188.5 | 173.8 |
| 173.8 | ||||||||||||||
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| Generator Set Sizing Worksheet |
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| Load Step # | 2 | |||||||||
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| Individual Load Characteristics |
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| SkVA | SkW | RkVA | RkW | GkW | QTY | skVA | skW | RkVA | Rkw |
| Gkw | |||
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Load |
| Enter RkW total from previous load step | 173.8 |
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Enter RkVA, RkW, and GkW totals from previous load step | 188.5 | 173.8 |
| 173.8 | |||||||||||
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2. | — | — | — |
| — | — | 1 | 9 | 8 h | 81.9h | 89h | 81.9h |
| 163.8h | |
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| Load Step Totals | 89 | 255.7 | 277.5 | 255.7 |
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Figure 1. Genset Sizing Worksheets
(Example Two-Step Loading Application)
NOTES:
a.For the two 100 HP motors, SkVA = HP x NEMA Code Letter Multiplier (Table 6) = 100 x 5.9 x 0.64 = 377.6
b.SkW = SkVA x SPF = 377.6 x 0.3 =113.3
c.RkW = HP x 0.746 / 0.91 = 81.9
d.RkVA = RkW / RPF = 81.9 / 0.92 = 89
e.A GkW total will need to be found because Load #2 is a nonlinear load. Therefore, enter values for GkW for the linear loads. GkW= RkW for linear loads.
f.These values are twice the values in the individual load characteristics columns because QTY is 2 for Load #1.
g.For the fluorescent lighting, RkW = SkW. SPF and RPF both = 0.95
h.For the 100 HP VFD motor: GkW = RkW x generator sizing factor = 81.9 x 2.0 = 163.8; SkW = RkW; and SkVA = RkVA.
INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 19
