Why Generator Sizing Matters
Having an understanding of commercial generator sizing is critical to selecting the right generator. It’s important that the generator runs efficiently while providing enough power for the facility’s needs. Facilities need a power plan with generators that can run continuously and indefinitely until power is restored. The last thing facility managers want to experience is an unreliable power system during an emergency scenario.
Estimating specific facility power needs is difficult which can lead to miscalculations and an undersized generator that is insufficient. This can not only slow or stop the facility’s operation, but it can also damage important and costly equipment. Selecting the appropriately-sized generator is critical.
How to Calculate The Generator’s Power Needs
Starting Wattage
- Take the generator’s kW, let’s assume 50 kW
- Add 10 watts per square foot of facility space to come to an estimate
Running Wattage
Accounting for Voltage Dips
Another factor to consider when configuring standby power systems is voltage dips in the generator. These dips affect both the generator and the equipment they’re powering:
- Different pieces of equipment have different tolerances for voltage dips
- The starting load of an electric motor can be as much as six times its running load
