What size generator for a 3-stall restroom trailer?

Question

We're planning a wedding for 120 guests at an off-grid ranch venue. The ground is flat grass, and a delivery truck can drive right to the spot. We're renting a 3-stall restroom trailer for the weekend. The rental company confirmed we need to provide our own generator because there's no power hookup.

The trailer has three flushing toilets, three sinks with running water, interior lighting, and a ventilation fan. I know the power needs depend on the onboard water pump, the lights, and whether we want to run a small space heater for a fall evening.

I'm trying to figure out the generator size to rent without overspending on something way too big. What's the actual wattage we should be looking for to run everything smoothly? Does the length of the event or the number of guests using it affect the power draw?

Owen G. · Answer

A 3-stall restroom trailer needs a generator with a continuous output rating of at least 3500 watts to run all systems smoothly. The onboard water pump draws the most power when it cycles, interior lighting and ventilation fans add a constant load, and a small space heater for fall evenings will spike the demand. The length of the event or number of guests does not change the power draw significantly; the systems run at full capacity whenever they are active. Rent a generator with a 3500-watt continuous rating and a 4000-watt surge capacity to handle the heater startup. Confirm the rental company's specifications for your specific trailer model, as some units may have higher requirements.

What size generator for a 3-stall restroom trailer?

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