Compare Generators Side-by-Side

Generator

Generator

6875 W

420 lbs

120/240

120/240

Generac G-Force OVHI 4-stroke

300 cc OHV 4-stroke

Electric

Recoil

3 years

2 years

19300 W

6875 W

EPA

CARB, EPA

696471083705

815683020036

15500

5500

11

15

60

60

G-Force OVHI 4-stroke

OHV 4-stroke

10W-30 / SAE 30

SAE 30 or 10W-30

11

15

Low oil and overload protection, CO monitoring

Low oil and overload protection

Oil, battery, and wheel kit

Oil, funnel, tool kit, and wheel kit

3

The Generac #7705 GP15500EFI is a 15,500-watt gasoline generator built for whole-house backup and RV power. Electronic Fuel Injection adjusts fuel delivery based on load, meaning the engine burns only what it needs rather than running at a fixed rate. At this wattage, it can run central air conditioning, a well pump, kitchen appliances, and multiple lighting circuits simultaneously, functioning as a realistic alternative to a permanently installed standby system without the installation cost or natural gas hookup.

The Cat RP5500 is a 5500-watt gasoline generator built for homeowners, contractors, and outdoor enthusiasts who need reliable backup power without the complexity of larger units. This wattage tier handles most household circuits simultaneously, meaning you can run a refrigerator, well pump, and power tools at the same time, but not your entire home's air conditioning system. The 6875-watt peak capacity gives it the muscle to start high-inrush devices like compressors and sump pumps without stalling. Because the RP5500 runs on gasoline, fuel is available at any gas station, eliminating the supply chain friction of propane or diesel models. The 7.9-gallon tank paired with 15-hour runtime at half load means you refuel roughly once per day under typical use, not every few hours.