⚡ RV Generator Size Calculator (Find Your Exact Size Instantly)

Not sure what size generator you need for your RV? Use the calculator below to get an exact recommendation in seconds — based on your air conditioner and power usage.

✔ Calculate running watts instantly
✔ See startup (surge) requirements
✔ Get the right generator size — no guesswork

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Scroll down to see the best generators for your exact wattage range

Compare the Best Generators for Your RV

👉 Start with the generator size recommended above — then choose the best option below based on your budget, noise preference, and power needs.

We’ve broken down the best generators by wattage so you can quickly find the right fit for your RV setup.

Recommended Generators by Wattage

💡 Tip: If your calculator result was close to the upper end of a range, choose the next size up to avoid overload and ensure smooth AC startup.

2000–3000 Watts (No AC / Light Use RVs)

If you don’t need air conditioning, this is the easiest and most affordable generator setup.

Best for van campers, teardrop trailers, and RVs without air conditioning or with very minimal power needs.

These generators can comfortably run:

• Lights
• TV
• Phone/laptop charging
• Small appliances (coffee maker, fan)

⚠️ Important:

A 2000W generator will NOT run an RV air conditioner, even with a soft start.

💡 Who this is perfect for:

• Boondocking / off-grid camping
• Quiet campgrounds with noise restrictions
• Backup power for essentials only

3000–4000 Watts (Small RVs & Single AC)

Best for lightweight travel trailers and smaller RVs. These generators can typically run a 13,500 BTU AC, especially with a soft start installed.

4500–5000 Watts (Most RV Setups)

The most popular range for RV owners. Handles a 13.5k–15k BTU AC plus additional appliances without struggling — making it the best all-around choice

5000+ Watts (50 Amp & Large RVs)

Best for larger RVs, 50 amp service, or running multiple AC units. These generators provide the extra headroom needed for reliable startup and heavy loads.

Related Guides

• What Size Generator for RV AC
• Best Generators for Travel Trailers
• Quietest RV Generators Compared
• Can a 2000W generator run an RV AC?

Frequently Asked Questions

What size generator do I need for a 30 amp RV?

Most 30 amp RVs need between 3,000 and 4,500 watts depending on appliances.

Can a 3500 watt generator run an RV AC?

Yes, many 13,500 BTU RV AC units can run on a 3,500 watt generator, especially with a soft start installed.

What is starting wattage vs running wattage?

Running watts are the continuous power needed, while starting watts are the extra surge required when appliances first turn on.