Last updated: March 2026

RS13A

Power: 13kW LP / 13kW NG
Installed Cost: $8,000–$12,000
Noise: 65 dB
Weight: 479 lbs
Warranty: 5 years
Fuel: Dual-fuel (NG/LP)

Best for: 1,500–2,000 sq ft where noise and compact size matter. Smallest footprint available.

The RS13A is Cummins' entry point into residential standby: and it immediately separates itself. At 65 dB, it's quieter than any Generac or B&S at a comparable size. At 34.1" × 36" × 27.3", it has the smallest footprint of any standby generator you can buy. And 13 kW on both fuels: no NG derating.

What This Generator Keeps Running

2-ton central AC (with built-in load management cycling large loads), refrigerator, freezer, gas furnace, sump pump, lighting, home office, CPAP.

Limitations: A 3-ton AC. The startup surge eats too much capacity even with load management. Step up to RS17A or RS20A.

What It Actually Costs

Unit price

$4,385

Installed

$8,000–$12,000

Priced competitively with the Generac 14kW ($8,000–$12,000) despite being 1 kW smaller. Comes with built-in load management that Generac doesn't include.

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How Loud Is It?

65 dB in all conditions: exercise, half load, full load. No separate exercise/full-speed rating. Just one number, always.

How Big Is It?

34.1" × 36" × 27.3" smallest residential standby available. Fits where other brands physically don't.

Maintenance

Cummins QSJ999G (999cc V-Twin). Service every 250 hours or annually. Maintenance log required for warranty.

Pros & Cons

The sell

✓65 dB across all conditions: quietest with Cummins siblings
✓Smallest footprint available: fits in tight installations
✓13 kW on both fuels: no NG derating
✓Built-in load management for 4 appliances
✓Extreme weather variant (RS13AE) rated to -40°F
✓Clean recall record
✓Cloud Connect includes remote start/stop

The catch

✗13 kW limits you to 2-ton AC max
✗Smaller Cummins residential dealer network
✗$1,200 prepayment reported for service calls at some dealers
✗Cloud Connect has 'status unavailable' outages
✗Transfer switch sold separately
✗Only 3 sizes in entire Cummins residential lineup

Frequently Asked Questions

Is 13kW enough for a house?▾

Under 2,000 sq ft with 2-ton AC and gas heat: yes, especially with the built-in load management. Without AC, 13 kW covers essentials generously. With a 3-ton+ AC, you need the RS17A or RS20A.

How quiet is the RS13A?▾

65 dB at 23 feet in all operating modes. About two people laughing at a restaurant. At your neighbor's property line (50–100 feet), 47–53 dB: below noise ordinances everywhere.

What's the RS13AE?▾

Extreme weather variant with oil heater and battery warmer, rated to -40°F. About $400 more ($4,779 vs $4,385). Worth every dollar if you're anywhere that regularly drops below zero.

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