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ReaLoadREVIEWS
ReaLoad Engineering Benchmark

Cummins C25D6 (25kW Diesel) vs. Kohler 38RCLB

Fuel Benchmark:
Elevation:

ReaLoad Technical Verdict & Engineering Dossier

Motor Surge & HVAC Starting

Kohler 38RCLB 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
Kohler 38RCLB
35,000 W running on NG (+35000 W lead)
Acoustic Winner
Kohler 38RCLB
55 dBA at 23ft (-11 dBA quieter)
Easiest Home Hookup
Cummins C25D6 (25kW Diesel)
Floating Neutral (Home Interlock Ready)
Best $/Running Watt
Cummins C25D6 (25kW Diesel)
$0.60/W ($14,999)
Technical Specification
Enclosed Inverter
Cummins C25D6 (25kW Diesel)
$14,999Read Review
Enclosed Inverter
Kohler 38RCLB
$16,999Read Review
Running Watts
Power Output
25,000 WBest
5,000 W
Peak Starting Surge
Power Output
25,000 WBest
6,250 W
240V Output Amps
Power Output
104.2 ABest
20.8 A
Sine Wave Purity
Power Quality
<2.5% THD (Pure Sine)
<1.8% THD (Pure Sine)Best
Fuel Burn (25%)
Fuel Consumption
0.85 GPHBest
2.50 GPH
Fuel Burn (50%)
Fuel Consumption
1.45 GPHBest
4.20 GPH
Runtime (25% Load)
Fuel Consumption
58 Hours
999 HoursBest
Fuel Tank Capacity
Fuel Consumption
50 GallonsBest
0 Gallons
14-50R 50A Outlet
Outlets & Receptacles
None (Use Adapter)Best
None (Use Adapter)Best
L14-30R 30A Outlet
Outlets & Receptacles
NoneBest
NoneBest
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
Electric Push-Button & Recoil Pull
Carbon Monoxide Sensor
Starting & Safety
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
Noise Level (23ft)
Acoustics & Physical
66 dBA
55 dBABest
Chassis Dimensions
Acoustics & Physical
82" L × 34" W × 55" H
76.8" L × 33.5" W × 45.2" H
Dry Weight
Acoustics & Physical
1650 lbs
1250 lbsBest
Neutral Bonding
NEC 2026 Hookup
Floating Neutral (Ready for Home Interlock)
Floating Neutral (Ready for Home Interlock)
Verified Street Price
Cost & Value
$14,999.00Best
$16,999.00