Cromtech Outback 4.5kW vs Ryobi RPGENINV4K Inverter Generators

Cromtech Outback 4.5kW

Higher running power

More AC and DC outlets

Provides Oil alert

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Greater fuel capacity

Longer run time

Lower weight

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Choosing a large portable generator can be quite a challenging task as you need to select the correct size, noise level and find one that fits within your budget. The reason you would need a portable generator this big could vary from running multiple tools on construction sites, supporting outdoor events or even acting as a home backup during an outage.

We will be comparing the Cromtech Outback 4.5kW and the Ryobi RPGENINV4K models, each with their own key selling points, such as pure sine wave technology and remote start for the Cromtech, and safe for sensitive electronics with easy start technology on the Ryobi. Our aim is to help you decide which generator is ideal for your needs by comparing these key features.

Performance & Power

Running Power (W): Cromtech Outback has 3700W vs Ryobi’s 3100W. This tells us how much continuous power the generator can provide. This is important because your devices’ total running watts should not go beyond this number. For instance, both generators could run industrial vacuums or water heaters, which operate around 3000W.

Starting Power (W): Cromtech offers 4500W whereas Ryobi offers 4000W. Devices with motors, such as power tools and air conditioners, require a burst of power when they start. This starting power allows the generator to accommodate that initial surge.

Engine type: Both units feature a 212cc OHV engine type which uses petrol. The compact and durable design of an Overhead Valve (OHV) leads to improved power output.

Inverter: Both these models utilise inverter technology providing cleaner power essential for sensitive electronics like laptops. These are generally more fuel-efficient and quieter.

Fuel & Run Time

Fuel Type: Both models run on Petrol.

Fuel Tank Capacity: Cromtech has a 7L tank vs Ryobi’s larger 12L tank. A larger fuel tank can lead to longer usage time in between refills but also more weight and possible size increase.

Run Time: Cromtech estimates a run time of 4 to 12 hours depending on load. Ryobi offers run times of around 12 hours at half load. Longer run times mean fewer interruptions for fuel refills.

Physical Specs

Dry Weight: The Cromtech model weighs slightly more than the Ryobi, with weights of 37.7kg and 35kg respectively, which may affect its portability.

Size: The Cromtech Outback measures 58 x 45.3 x 48.1 cm compared to Ryobi’s slightly bigger at 58.5 x 38 x 54 cm.

Wheels: While it is not specified whether the Cromtech model includes wheels, the Ryobi model certainly does, which could make it easier to move around.

Outlets & Parallel Use

AC Outlets: Cromtech has two outlets while Ryobi offers three. More outlets let you power more devices at once

DC Outlets: The Cromtech generator includes a USB (5V – 2AMP) and a DC outlet (12V – 8AMP), whereas no specifics are given about the Ryobi outlets. DC outlets are handy for charging batteries or smaller appliances such as phones or lights.

Parallel Use: It is not specified if either product allows for parallel use – a function allowing you to connect two of the same model together to double output.

Features & Usability

While data on some features are not specified, we can infer a few based on available information:

  • Starter system: The Cromtech model comes with three methods: remote, electric and the traditional recoil start, while Ryobi boasts an easy-start technology.
  • Oil Alert: Only the Cromtech model specifically mentions an oil alert system, which could help prevent engine damage.
  • Indicators: The Cromtech generator features a digital display showing volts, Hz and hours. There’s no information on similar features for the Ryobi model.

Noise Level

The noise level for Cromtech falls between 55-60 dBA, quieter than Ryobi’s 67 dBA – somewhere between a normal conversation (60-70dBA) and a vacuum cleaner (75dBA).

Cromtech Outback 4.5kW vs Ryobi RPGENINV4K Comparison Table

FeatureCromtech Outback 4.5kWRyobi RPGENINV4K
Warranty1 YearsNot specified Years
Engine Type212 cc212 cc, OHV
Air CooledNot specifiedNot specified
Running watts3700 W3100 W
Max / Starting watts4500 W4000 W
Voltage (AC)230 V240 V
DC Output12V, 8.0AMPNot specified
AC Frequency (Hz)5050
Rated Output (kVA)Not specifiedNot specified
FuelPetrolUnleaded Petrol
Fuel Tank Capacity7 L12 L
Run time (Hours)Four to 12 hours (depends on load)12 (at half load)
Dry Weight (Kg)37.735
Size (L x W x H)58 x 45.3 x 48.1 cm58.5 x 38 x 54 cm
WheelsNot specifiedY
Number of AC Outlets2 x outlets (15 AMP – IP44)3
DC OutletsUSB 5V – 2AMP, DC 12V – 8.0AMPNone
Parallel useNot specifiedN
Starter SystemRemote / Electric / RecoilEasy start technology
Fuel gaugeNot specifiedNot specified
Oil alertYNot specified
Noise Level (dBA)55-6067


In summary, the Cromtech Outback seems to offer more power output and useful features like more AC outlets, additional DC outlets, oil alert system and informative digital display. On the other hand, the lighter weight, larger fuel tank and extra AC outlet in the Ryobi RPGENINV4K may make it ideal if fuel economy and lower running costs are your priority. Remember that choosing between these two ultimately depends on what you prioritise in a generator – be it power, size or certain features.