Generator rental: how many kVA you need for events and jobs

Generator rental starts with the right kVA

When planning a beach event or a job site without power near Itajaí, Balneário Camboriú or Navegantes, the first step in generator rental is calculating the right kVA. One kVA equals roughly 0.8 kW of real output, and every appliance you plug in adds to the total load.

The math is straightforward: list the wattage of each device, add them up and divide by 800. Add a 20 percent safety margin for startup spikes — freezer compressors and motors can draw up to three times their rated wattage the moment they switch on. That result is the minimum kVA to look for in a listing.

• JBL speaker 1,000 W: 1.0 kW
• Horizontal freezer 300 W: 0.3 kW
• Four LED floodlights 40 W each: 0.16 kW
• Demolition hammer 1,200 W: 1.2 kW
• Impact drill 800 W: 0.8 kW

Generator for parties: sound, freezers and lighting

A party of 30 to 50 people with a 1,200 W speaker and a 100-liter cooler typically runs well on a 3 kVA generator. A DJ setup with a lighting rack and two horizontal freezers calls for at least 5 kVA to avoid overload during the night.

In Balneário Camboriú, where beach parties are common during the summer season, a party generator usually sits between 3 and 5 kVA. If an electric heater is also on the list, include its wattage before choosing the unit size.

Job sites without power: the heaviest consumers

On job sites without a power outlet, the heaviest consumers are the demolition hammer (usually 800 W to 1,500 W), the angle grinder (700 W to 2,200 W depending on disc size) and the impact drill (600 W to 1,000 W). A 3 kVA unit lets you run one of these tools at a time alongside a work light.

When two workers operate different power tools simultaneously, a 5 kVA generator provides enough headroom and protects electronics from voltage drops. In Navegantes, where residential construction has been expanding steadily, this size is frequently booked on weekends.

Gas or diesel: choosing the right type

Gasoline generators are lighter, slightly louder and generally cheaper to rent per day. They are the most practical choice for one-day events and short jobs, where you fill up once and return the tank at the same level agreed with the owner.

Diesel generators run more hours per liter, operate more quietly under continuous load and suit multi-day construction jobs better. Diesel costs more per liter, but the fuel consumption per kWh produced tends to be lower. For a six- to eight-hour party in Itajaí, gasoline is usually enough.

Noise, extension cords and returning the unit

Standard generators reach around 70 dB near the casing — similar to a lively conversation. Position the unit at least 10 meters from the gathering area, outside the tent or behind a wall or fence. Never run a generator in an enclosed space: carbon monoxide from the exhaust is odorless and dangerous.

Extension cords must match the load and length. For 10 meters carrying up to 2 kW, a 2.5 mm² cord works fine; for 30 meters or heavier loads, use at least 4 mm². Coiled or folded cords generate heat under load, so stretch the full length before switching on. Check the listing or ask the owner in the chat whether a cord is included.

• Photograph the fuel level at pickup
• Let the engine cool for 30 minutes before transport
• Wipe the casing with a damp cloth
• Check that cords, funnel and manual are all together
• Send a photo of the unit's condition in the chat when returning