Need a generator but not sure what size or type fits your job?
You’re not alone. Choosing the wrong generator leads to blown circuits, dead tools, or wasted fuel. Whether you’re powering a construction site, outdoor event, or backup system, the goal is simple: get enough power, safely, without going overboard.
This guide covers exactly what to consider — from wattage and runtime to fuel type and outlet configurations — before you book a generator rental.
Step 1: Know Your Power Requirements
Start with the total wattage you need. Every tool, appliance, or piece of equipment has a starting wattage (initial power surge) and running wattage (steady consumption).
Examples:
| Equipment | Starting Watts | Running Watts |
|---|---|---|
| Circular Saw | 2,300W | 1,200W |
| Air Compressor (1 HP) | 4,500W | 1,600W |
| Fridge | 2,200W | 700W |
| String Lights (100 ft) | N/A | 150W |
Add everything up, then add 10–20% buffer. That’s the minimum output your generator should support.
Step 2: Choose the Right Type of Generator
There are 3 main types:
- Portable Generators
- Great for small tools or emergency power
- Easy to move and store
- Typically gas-powered
- Example use: powering a few tools on a jobsite
- Inverter Generators
- Stable, clean power for electronics
- Quieter and fuel-efficient
- Great for outdoor events or camping
- Example use: live music stage, food truck
- Towable or Industrial Generators
- Large fuel tanks, multi-day runtime
- 20kW–100kW+ power capacity
- Diesel-powered, rugged construction
- Example use: full construction site or emergency backup for commercial facility
If you’re not sure which one fits your application, our team can match you to the right option through our generator rental page.
Step 3: Consider Runtime and Fuel Type
Ask these before renting:
- How long will the generator run on one tank?
- What kind of fuel does it use — gas, diesel, propane?
- How easy is it to refuel during the job?
For long-duration projects or remote sites, diesel is often preferred due to availability and efficiency. For sensitive electronics or AV equipment, inverter generators are a safer bet.
Step 4: Match Your Outlets and Cords
Double-check your plug types. Generators vary in the outlets they offer — some come with standard 120V, others include 240V twist-lock or RV-style outputs.
If you’re using heavy-duty tools, make sure:
- The generator has GFCI-protected outlets
- Your extension cords are rated for the wattage and voltage
- You don’t exceed the amp load per outlet
Always check both the amp rating and connector type before plugging in.
Step 5: Think About Noise and Placement
Generators make noise — some a lot more than others. Consider:
- DB level if you’re in a residential or public space
- Weatherproofing — is it rated for outdoor use?
- Ventilation — always place away from enclosed spaces to avoid carbon monoxide risk
Many local ordinances have noise restrictions. If you’re running a generator at an event or near homes, low-noise inverter models are the way to go.
Common Use Cases and the Right Generator Size
| Application | Recommended Generator Size |
|---|---|
| Small tools (1–2 units) | 2,000–4,000W |
| Food truck / AV equipment | 3,000–6,500W inverter |
| Home backup (lights + fridge) | 5,000–7,500W |
| Jobsite with multiple tools | 7,000–10,000W |
| Full-site power / commercial use | 20kW+ towable unit |
Still unsure? No problem — we’ll walk you through sizing on the phone or by email.
Rent the Right Generator, the First Time
Avoid downtime and keep your tools powered properly.
Explore generator rental options or contact us now for sizing help and availability.
