Running your RV air conditioner on a small generator used to be nearly impossible—until soft start technology changed everything.
If you’ve ever tried to run your AC on a 2000-watt generator and it failed to start (or tripped instantly), you’re not alone. The problem isn’t running watts—it’s startup surge.
This guide will show you:
- What a soft start does (in plain English)
- How it lets you run AC on smaller generators
- The best soft start units for RV air conditioners
- Which one you should actually buy
Before choosing a soft start, make sure you know your power needs using this RV generator sizing calculator
A soft start is the easiest way to run your RV air conditioner on a small 2000 watt generator without overload issues.
This post may contain affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.
What Is a Soft Start for RV AC?
A soft start is a small device installed inside your RV’s air conditioner that reduces the massive power spike when the compressor turns on.
Without a Soft Start:
- AC startup surge: 3000–4000+ watts
- Result: Generator overload / breaker trip
With a Soft Start:
- Startup reduced by up to 70%
- AC becomes usable on:
- 2000W generators
- Small inverter generators
- Battery + inverter setups
In simple terms:
It “eases” your AC on instead of slamming it on full power.
Why You Need a Soft Start (Especially for 2000W Generators)
If you’re trying to:
- Run AC on a Honda EU2200i
- Use a portable inverter generator
- Boondock with limited power
…a soft start is the missing piece.
Without one, even a properly sized generator can fail due to surge demand.
If your generator keeps tripping, you may also need a properly sized unit—see our best generators for RV guide
Can You Run an RV AC on a 2000 Watt Generator?
Yes, you can run an RV air conditioner on a 2000 watt generator—but only if you install a soft start.
Most RV AC units require 3,000–4,000+ watts to start, which exceeds the capacity of small generators. A soft start reduces startup power by up to 70%, allowing a 2000W generator to handle the load.
Quick Answer:
- Without soft start → ❌ Will not start
- With soft start → ✅ Usually works (13,500 BTU units)
- 15,000 BTU units → ⚠️ Depends on conditions
👉 The most reliable option is the Micro-Air EasyStart 399, which is specifically designed for RV air conditioners.
Reducing RV air conditioner startup surge can also improve compatibility with larger solar generators and portable power stations. Here are the best solar generators for RV camping.
Best Soft Start for RV AC (Top Picks)
Micro-Air EasyStart 399 (Best Overall)
👉 Best Choice for Most RV Owners: Reliable startup even on small generators.
The Micro-Air EasyStart 399 is the latest evolution of Micro-Air’s industry-leading soft start technology—and it’s the one most RV owners are buying today.
The newer EasyStart 399 replaces the older 364 model, which was long considered the best soft start for RV AC units.
Why This Is Now #1:
- Reduces startup surge by up to 75%
- Designed specifically for RV air conditioners
- Works with 13,500 & 15,000 BTU units
- Improved compatibility vs older 364 model
- More widely available (especially on Amazon)
🔥 Real-World Advantage:
This is one of the most reliable ways to run your AC on a 2000W generator like a Honda EU2200i.
399 vs 364 (What Changed?)
If you’re wondering why you’re seeing the 399 instead of the 364:
- 364 = older, still excellent, but harder to find
- 399 = updated version with broader compatibility
👉 Performance is very similar
👉 Availability + ease of purchase = better with 399
Best For:
- RV owners who want a plug-and-play proven solution
- Running AC on small inverter generators
- Anyone who just wants it to work without headaches
Bottom Line:
If you’re buying today…
Get the EasyStart 399
It’s the most practical, available, and beginner-friendly choice right now.
SoftStartRV (Best Alternative)
👉 Good Alternative: Slightly easier install with solid performance.
The SoftStartRV is another strong contender with a growing reputation.
Pros:
- Slightly easier installation
- Competitive performance
- Good customer support
Cons:
- Less field history than Micro-Air
- Slightly less refined learning system
Best For:
- DIY-friendly installs
- Budget-conscious buyers who still want quality
Hyper Engineering SureStart (Budget Pick)
👉 Budget Pick: Works well, but requires a bit more setup.
The Hyper Engineering SureStart SS1B16-32SN is a more affordable option.
Pros:
- Lower cost
- Still reduces startup surge significantly
Cons:
- Not as optimized for RV-specific use
- Less “plug-and-play” feel
Best For:
- Budget installs
- Older AC units
| Product | Best For | Ease of Install | Performance |
|---|---|---|---|
| EasyStart 399 | Best Overall | Easy | ★★★★★ |
| SoftStartRV | Best Value | Very Easy | ★★★★☆ |
| SureStart SS1B16-32SN | Budget Pick | Moderate | ★★★☆☆ |
Which Soft Start Should You Choose?
If you want the short answer:
- 👉 Best overall: Micro-Air EasyStart 399
- 👉 Best value: SoftStartRV
- 👉 Cheapest option: SureStart
If your goal is to run your AC on a 2000-watt generator, go with:
✅ Micro-Air EasyStart 399 (most reliable success rate)
Can You Run an RV AC on a 2000 Watt Generator?
YES — but only with a soft start (in most cases)
With a soft start installed:
- 13,500 BTU AC → ✅ Usually works
- 15,000 BTU AC → ⚠️ Depends on conditions
Without a soft start:
- ❌ Almost always fails on startup
Important: Pair This With the Right Generator
A soft start is only part of the equation.
You’ll still need the right generator size.
Make sure to read your full guide here:
RV Generator Calculator
Installation: Is It Hard?
Most installs take 30–60 minutes.
Basic steps:
- Turn off power
- Open AC shroud
- Connect 4–5 wires
- Mount the module
- Close unit and test
Many RV owners do this themselves—even beginners.
Things to Watch Out For
- Always verify compatibility with your AC model
- Follow wiring diagrams carefully
- Secure wires properly (vibration matters)
- Avoid cheap knockoff units
Final Verdict
If you want to run your RV AC quietly and reliably on a small generator…
A soft start isn’t optional—it’s essential.
Best Choice:
Micro-Air EasyStart 399
👉 Best Choice for Most RV Owners: If you want your AC to start reliably on a small generator, this is the safest and most proven option.
View Latest Price & Availability⚠️ Popular with RV owners—often sells out during peak camping season
It’s the most proven, most reliable, and most likely to actually work on the first try.
Frequently Asked Questions
What is a soft start for RV AC?
A soft start is a device that reduces the startup power surge of an RV air conditioner, allowing it to run on smaller generators or limited power sources.
Can a 2000 watt generator run an RV air conditioner?
Yes, but typically only with a soft start installed. Without it, the startup surge will overload most 2000W generators.
How much does a soft start reduce startup watts?
Most soft starts reduce startup power by 50% to 75%, depending on the AC unit and model.
Is a soft start worth it for an RV?
Yes. It allows you to run your AC on smaller generators, reduces strain on your electrical system, and improves overall efficiency.
Which soft start is best for RV AC?
The Micro-Air EasyStart 399 is widely considered the best due to its reliability, performance, and compatibility with most RV air conditioners.
Disclosure: As an Amazon Associate, I earn from qualifying purchases. This helps support the site and allows us to continue providing helpful RV guides at no additional cost to you.
