How to Run Your AC on a Portable Generator with a Soft Start Kit

If you own a portable generator, you've probably tried — or thought about trying — to run your air conditioner on it during a power outage. And if you've tried, you may have tripped the breaker, overloaded the generator, or just given up.

Here's the thing: it's not your generator's fault. It's physics.

The Startup Surge Problem

When an AC compressor starts up, it draws 3 to 5 times its normal running amperage for a fraction of a second. That surge is called the locked rotor amperage (LRA), and it's brutal on generators.

A 3-ton central AC unit might run at 15–18 amps normally — but at startup, it can spike to 60–80 amps. Most portable generators in the 7,500–10,000 watt range simply can't handle that surge, even if they can handle the running load just fine.

The result: the generator bogs down, trips its overload protection, or shuts off entirely.

What a Soft Start Kit Does

A soft start kit — like the MicroAir EasyStart — installs directly on your AC compressor and electronically controls how the motor ramps up. Instead of slamming from zero to full speed in a fraction of a second, the compressor starts gradually over about 2–3 seconds.

The result: startup amps are reduced by up to 70%. That same 3-ton AC unit that used to spike at 70 amps now starts at around 20–25 amps — well within the range of a 10kW+ portable generator.

What Size Generator Do You Need?

With a soft start kit installed, most single-zone central AC systems (up to 3.5 tons) can run on a 10,000–12,000 watt portable generator. You'll also be able to run lights, a refrigerator, and a few other essentials at the same time.

Without a soft start kit, you'd need a much larger — and much more expensive — generator to handle the startup surge.

The Never Without Power In-House Special

We install the MicroAir EasyStart for $1,000 flat — that's our in-house price, and it's available year-round. Competitors in the Houston area typically charge $1,500 to $1,600 for the same installation.

The install takes about an hour. We connect directly to your AC compressor, test the startup sequence, and confirm everything is working before we leave.

Is It Worth It?

If you already own a portable generator and want to use it to keep your family cool during the next Houston power outage — yes, absolutely. The soft start kit costs a fraction of what a standby generator costs, and it turns your existing generator into a real backup solution for your AC.

It's also a smart upgrade even if you have a standby generator, since it reduces wear on the generator's engine every time the AC cycles on.

Want to stop sweating through the next outage? See our full soft start kit offer or call us at (832) 633-7769 to schedule your install.