Micro-Air EasyStart Soft Starter Central A/C Generator Sizing Guide
01 Locked-Rotor Amps (LRA) vs Running Load Amps (RLA)
Central air conditioner compressors require massive electrical current during initial rotor acceleration. A typical 4-ton scroll compressor draws 75 to 90 locked-rotor amps (LRA), representing over 18,000 watts of surge demand.
Once up to speed, running current drops to 14 to 18 amps (3,500 to 4,200 watts). This spike forces homeowners without soft-starters to purchase oversized commercial units simply to survive startup spikes.
- Locked-rotor surge draws 5 times continuous running wattage.
- Standard generators trip internal breakers on direct compressor starts.
- Soft-starters eliminate the need for expensive 20kW standby units.
02 How the Micro-Air EasyStart Dynamic Ramp Works
The Micro-Air EasyStart monitors motor torque and applies pulsed phase control over a 300-millisecond window. This smooth ramp reduces inrush current from 80 amps down to 24 amps.
The device learns compressor characteristics over its first four startup cycles. Calculate your required inverter capacity with our Home Breaker Load Sizer.
- 1 Mount EasyStart Housing: Secure the weather-resistant enclosure inside compressor electrical compartment.
- 2 Wire Run Capacitor and Contactor: Connect black wire to run capacitor and brown wire to compressor terminal.
- 3 Complete 4 Learning Starts: Run four consecutive cooling cycles on utility power to calibrate.
03 Minimum Generator Sizing Matrix for 3-Ton, 4-Ton, and 5-Ton Units
With an EasyStart installed, a 3-ton central A/C starts easily on a 7,500-watt inverter like the Predator 9500 Inverter. A 4-ton compressor requires a 9,000-watt to 10,000-watt tri-fuel unit like the Genmax GM10500XiT.
Find local certified technicians to wire your HVAC soft-starter through our Orlando Transfer Switch Electricians directory.