Which generator delivers more running wattage, the RS13A or the PRO9.0E?

Kohler PRO9.0E delivers higher continuous output with 7200 running watts on gasoline.

Is the RS13A quieter than the PRO9.0E?

Cummins RS13A is quieter at 50% load, measured at 65 dBA at 23 feet.

Which model is better suited for a whole home transfer switch interlock?

Cummins RS13A features a factory floating neutral ready for standard transfer switch hookup without modification.

ReaLoadREVIEWS

Home Backup & Portable Power Guide

ReaLoad Engineering Benchmark

Cummins RS13A vs. Kohler PRO9.0E

Highlight Differences

Fuel Benchmark:

Elevation:

ReaLoad Technical Verdict & Engineering Dossier

Motor Surge & HVAC Starting

Cummins RS13A delivers 6,250W surge, sufficient for a 3.5-Ton central A/C with soft-starter. Inverters under 7,500W surge will trip breaker overcurrent protection on direct compressor starts.

72-Hour Fuel Logistics

At 50% load over 72 hours, continuous gasoline generators consume ~56 gallons (11x 5-gallon cans). Direct utility Natural Gas hookup eliminates fuel storage degradation, winter freezing, and gas station queues.

NEC 250.20 Neutral Bonding

Cummins has factory floating neutral, safely compliant with 3-pole transfer switches and manual panel interlocks without ground loop faults.

Natural Gas Leader

Cummins RS13A

11,500 W running on NG (+5740 W lead)

Acoustic Winner

Cummins RS13A

62 dBA at 23ft (-7.5 dBA quieter)

Easiest Home Hookup

Cummins RS13A

Floating Neutral (Home Interlock Ready)

Best $/Running Watt

Kohler PRO9.0E

$0.24/W ($1,699)

Technical Specification	Enclosed Inverter Cummins RS13A $3,999Read Review	Open-Frame Inverter Kohler PRO9.0E $1,699Read Review
Running Watts Power Output	5,000 W	7,200 WBest
Peak Starting Surge Power Output	6,250 W	9,000 WBest
240V Output Amps Power Output	20.8 A	30 ABest
Sine Wave Purity Power Quality	<2.9% THD (Pure Sine)	<2.8% THD (Pure Sine)Best
Fuel Burn (25%) Fuel Consumption	1.05 GPH	0.52 GPHBest
Fuel Burn (50%) Fuel Consumption	1.70 GPH	0.83 GPHBest
Runtime (25% Load) Fuel Consumption	999 HoursBest	15.5 Hours
Fuel Tank Capacity Fuel Consumption	0 Gallons	8 GallonsBest
14-50R 50A Outlet Outlets & Receptacles	None (Use Adapter)	1x NEMA 14-50R (50A)Best
L14-30R 30A Outlet Outlets & Receptacles	None	1x NEMA L14-30R (30A)Best
TT-30R RV Outlet Outlets & Receptacles	NoneBest	NoneBest
5-20R Duplex Outlets Outlets & Receptacles	2x NEMA 5-20R DuplexBest	2x NEMA 5-20R DuplexBest
Engine Start Method Starting & Safety	Electric Push-Button & Recoil Pull	Wireless Remote, Electric Key & Recoil
Carbon Monoxide Sensor Starting & Safety	CO Watchdog / Shield Sensor (ANSI/PGMA G300)	CO Watchdog / Shield Sensor (ANSI/PGMA G300)
Noise Level (23ft) Acoustics & Physical	62 dBABest	69.5 dBA
Chassis Dimensions Acoustics & Physical	34.1" L × 29.7" W × 27.3" H	30.2" L × 23.6" W × 26" H
Dry Weight Acoustics & Physical	440 lbs	218 lbsBest
Neutral Bonding NEC 2026 Hookup	Floating Neutral (Ready for Home Interlock)	Bonded Neutral (Unbonding Required for Home ATS)
Verified Street Price Cost & Value	$3,999.00	$1,699.00Best

ReaLoad Technical Verdict Dossier

Motor Inrush Starting Surge

The Cummins RS13A delivers 6250W peak surge compared to 9000W on the Kohler PRO9.0E. Starting a 3.5-ton central air conditioner requires an electronic soft-starter to reduce compressor inrush below breaker trip thresholds.

72-Hour Outage Fuel Logistics

At 50% electrical load over a 72-hour power outage, RS13A consumes about 122 gallons while PRO9.0E burns 60 gallons. Homeowners need 25 sealed 5-gallon gasoline cans or utility natural gas.

Home Panel Interlock Safety

Cummins RS13A provides a factory floating neutral ready for standard 3-pole manual transfer switches. Follow NEC 250.20 safety grounding rules.

Head-to-Head Telemetry Comparison

Specification	Cummins RS13A	Kohler PRO9.0E
Running Watts (Gasoline)	5000W	7200W
Peak Watts (Gasoline)	6250W	9000W
Operating Noise @ 23ft	65 dBA	72.5 dBA
Factory Neutral Status	Floating Neutral	Bonded Neutral
Dry Weight	440 lbs	218 lbs
Verified Street Price	$3999	$1699