An independent report by SGS US Testing Company compares residential generators rated at or near 20 kW made by the top four U.S. manufacturers: Briggs & Stratton 20 kW (GE) 04035, Cummins Onan RS20A, Generac 20 kW (Guardian) 55060, and Kohler 17 kW 17RESL. 
The tests, which measured voltage and frequency performance using an industry-standard test procedure, showed that the RS20A generator from Cummins Onan was clearly superior. In fact, it was the only unit to be rated as G2 (Residential Grade).
Detail on the tests
The generators were evaluated using the industry-standard ISO8528-5 voltage and frequency test procedure. This test procedure evaluates a generator’s voltage and frequency performance and rates it as G1 (Marginal) or G2 (Residential Grade). This rating takes into account the stability and response time of the electricity delivered from the generator. Unstable or erratic frequency will result in irritating noise coming from the generator, and can cause connected devices to operate poorly and inefficiently. Erratic voltage will also cause lights to flicker.
As the sample figures below indicate, the products with lower performance ratings have more erratic and larger spikes and valleys than the products with ISO G2 and G1 ratings. It is also easy to see the drastic performance difference between G1 and G2 results.
How a generator responds to load changes in the home is critical. If it takes too long for the voltage or frequency to respond, devices like air conditioners, washing machines and dimmer switches will stop operating. If the voltage or frequency rises too much or too fast as loads are turned off, expensive electronics or appliances may be damaged. To ensure proper operation of devices in a home, a G1-rated generator is a bare minimum, and a G2-rated generator is highly recommended. This is to ensure the devices in the home operate properly, efficiently and safely while the generator is providing power.
John Klesk, product manager team leader for Cummins Onan, noted, ”Electricity is the lifeblood for our home appliances and indeed our standard of living. The quality of that electricity can have a real impact on how well appliances function when the generator is providing power. We are proud that the RS20A measured up in this independent test.”
The tests, which measured voltage and frequency performance using an industry-standard test procedure, showed that the RS20A generator from Cummins Onan was clearly superior. In fact, it was the only unit to be rated as G2 (Residential Grade).
Detail on the tests
The generators were evaluated using the industry-standard ISO8528-5 voltage and frequency test procedure. This test procedure evaluates a generator’s voltage and frequency performance and rates it as G1 (Marginal) or G2 (Residential Grade). This rating takes into account the stability and response time of the electricity delivered from the generator. Unstable or erratic frequency will result in irritating noise coming from the generator, and can cause connected devices to operate poorly and inefficiently. Erratic voltage will also cause lights to flicker.
As the sample figures below indicate, the products with lower performance ratings have more erratic and larger spikes and valleys than the products with ISO G2 and G1 ratings. It is also easy to see the drastic performance difference between G1 and G2 results.
How a generator responds to load changes in the home is critical. If it takes too long for the voltage or frequency to respond, devices like air conditioners, washing machines and dimmer switches will stop operating. If the voltage or frequency rises too much or too fast as loads are turned off, expensive electronics or appliances may be damaged. To ensure proper operation of devices in a home, a G1-rated generator is a bare minimum, and a G2-rated generator is highly recommended. This is to ensure the devices in the home operate properly, efficiently and safely while the generator is providing power.
John Klesk, product manager team leader for Cummins Onan, noted, ”Electricity is the lifeblood for our home appliances and indeed our standard of living. The quality of that electricity can have a real impact on how well appliances function when the generator is providing power. We are proud that the RS20A measured up in this independent test.”
Due to the high power demands for lighting (water at night absorbs a lot of light) and cleaning, there was a need for generator output that far exceeded the capacity of marine MKY genset.
Cummins Power Generation has developed an impressive array of e-newsletters aimed at different audiences around the globe. The overall goal for these electronic publications is simple: provide specific, timely information about particular Cummins Power Generation products, projects and events to people with an interest in them. Here's a description of each:
The RS20A residential generator uses Cummins Onan patented double-walled sound dampening technology. The double-walled generator design utilizes long air-flow paths and acoustic chambers to provide the lowest sound level ever offered in its class - all with the end user and neighbors in mind. Other manufacturers rely on a single wall design that does little to curtail unwanted noise and ultimately result in harsher tones and higher noise levels.
The air louvers located along the bottom edge of the circular roof provide an efficient inflow and outflow of air even in harsh weather. The height of the air louvers helps to ensures that the air is not cut-off in case of heavy snow and the horizontal air louver design reduces water ingestion in heavy rain– to ensure you can enjoy uninterrupted power supply even in the harshest conditions.
A secure built-in base not only reduces annoying vibrations, but it also eliminates the need and cost of pouring a concrete slab – for you to save time and money. Further, a single door lift-off design
allows effortless installation and maintenance. Plug and play harnesses also make the installation much quicker and easy to understand.
Quality is of the utmost importance for Dan O’Brien who own and operates Academy Electric.
A quick 
mage and evidently it disrupts the normal life. Extended periods of power loss are inconvenient and potentially dangerous. It is, thus, vital that you have an emergency power backup. This is where a generator comes into play. Most widely used generators for home usage are – portable gensets and standby residential generators. A residential generator has obvious advantages over a portable genset- automatic start, permanent fixture, more power, cleaner fuel (natural gas or propane), low running costs and cold weather-kit. Within moments of an electrical interruption, a home standby generator provides electricity to power essential items or whole house. It is easy to understand the complex but seamless operation of a home backup generator and transfer switch using this 
