Skip to content

Compare Generators Side-by-Side

Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.

  • Energizer eZV8000
  • Cat RP5500
  • Model eZV8000
    Model eZV8000

    Energizer 6,500W Gas Generator

    6500W
    Running
    76 dB
    Noise
    View details
  • Model RP5500
    Model RP5500

    Cat 5,500W Gas Generator

    5500W
    Running
    0 dB
    Noise
    View details
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
Generator Specifications Comparison
SpecificationEnergizer eZV8000Cat RP5500
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterYesNo
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 6500 W
5500 W
Starting watts
Winner: Winner: 8000 W
6875 W
Noise (lower limit)
Winner: Winner: 76 dB
0 dB
Weight
194 lbs
Winner: Winner: 178 lbs
Run time @50% load
Not available
Winner: Winner: 15 h
Run time @25% load
15.5 h
Not available
Fuel tank
5.5 gal
7.9 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
28 x 28 x 30
32.9 x 27.4 x 24.7
Electrical
Voltage (AC)
120/240V 60 Hz
120/240
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
<3% %
Not available
Engine
Engine
420 cc OHV 4-stroke
300 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric
Recoil
Warranty
Warranty
3 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
6500 W
5500 W
Starting watts
8000 W
6875 W
Running amps (120V)
Not available
Not available
Running amps (240V)
Not available
Not available
Peak amps (120V)
Not available
Not available
Peak amps (240V)
Not available
Not available
Run time @50% load
Not available
15 h
Run time @25% load
15.5 h
Not available
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
true
Not available
UPC
Not available
815683020036
Core / High-priority specs
Running Watts (Gasoline)
6500
5500
Starting Watts (Gasoline)
8000
6875
Runtime @ 50% Load (Gasoline)
Not available
15
Runtime @ 25% Load (Gasoline)
15.5
Not available
AC Outlet Types
2x Duplex 120V 20A (5-20R) GFCI; 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
2x Duplex 120V 20A (5-20R) GFCI, 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
420
300
Engine Oil Type
10W-30
SAE 30 or 10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
15.5
Not available
Runtime @ 50% Load (Gasoline)
Not available
15
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Included equipment
Included Accessories
Oil, funnel, tool kit, battery, and wheel kit
Oil, funnel, tool kit, and wheel kit
Warranty & identification
Commercial Warranty
3
Not available
Part Number
INVEZV8000CD
502-3686
Additional specs
Summary
The Energizer eZV8000 is a 6,500-watt inverter generator built around a 420cc OHV 4-stroke engine. This wattage places it squarely in the mid-to-heavy duty range, capable of powering multiple household appliances simultaneously. A typical home refrigerator (600 watts), microwave (1000 watts), and several lights (300 watts) can run together, leaving headroom for power tools or additional devices. The 8,000-watt peak rating handles the inrush demand when motors first spin up. Because the eZV8000 runs on gasoline and includes inverter technology with less than 3% THD, users can safely power laptops, TVs, and other sensitive electronics without risk of damage from power spikes. The 5.5-gallon fuel tank delivers 15.5 hours of runtime at 25% load, meaning a full tank can sustain light-duty operation through an entire workday or camping trip.
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.
  • Most Powerful
    Energizer eZV8000
    6500W running
  • Quietest
    Energizer eZV8000
    76 dB
  • Longest Runtime
    Cat RP5500
    15h at 50% load
Where to buy
Prices can change. We update these automatically.
Energizer eZV8000
Store links
No links yet.
Cat RP5500
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.