SIZES/OPTIONS/PRICES/SPECS

All our home automatic generators are single phase, 60 Hertz (Hz) 120/240 Volts (V), matching your home’s normal utility power. The size (power) of a generator is measured by its rated power output, designated in Watts (W) or in Kilowatts (kW or 1,000W), and is the product of it's amperage (Amp) and it's voltage(V). Home generator sizes vary from 8kW to 100kW and can support selected critical circuits or the entire house load.

A frequently asked question is “What size generator do I need for my home?”. The answer to this question is complex as it involves many factors including your requirements (what emergency lighting, appliances, and equipment circuits you want to include), your home’s utility supplier details (the number and size of your electrical panel/s, the energy supply source (Elect/NG/LP/Oil) and size (Btu, pressure, tank size, etc.) of your home’s equipment, the type and specifications of your equipment (size and type of motors, etc.), the layout and size of your home, your electrical usage history, and your budget (how much you want to spend on the system!).

There are many popular sizing charts available that allow you to determine on your own the size of the generator you need. While these charts are informative and user friendly, they fail to provide an accurate estimate of the electrical load required. Using these charts, people tend to pick out an outlet in the bedroom, lights in the kitchen, a computer in the study, or a garage door, and just add up the individual wattage of these selections. In fact, what must be added to the wattage calculation is the total load on the entire circuits that contain those selections, which may result in a value for the total required wattage that is several times that of the one computed by a sizing chart. This is because the electrical installation involves the relocation of an entire circuit into the emergency panel and not the individual outlet selected. Our clients who have used these charts are surprised when told that they cannot have a 10kW automatic generator system to back-up their entire home's 200 Amp electrical panel . Theoretically, the generator size needed to support a 200 Amp panel is a 48kW (200 Amp multiplied by 240 V), but that too may be unreasonable from a code/practical/budget perspective. In this example, the final size proposed will usually be somewhere in the middle, maybe a 25kW. This determination can only be made after a thorough on-site technical evaluation of all the items discussed above.

As a general guide only, we can suggest allocating 1,000 Watts of generator power for each single pole (120V) 15-20 Amp circuit, and allocating 2,000 watts for every 10 Amp of each double pole (240V) circuit. For example, a 15-20 Amp SP general lighting circuit and a 20 Amp DP well pump require a 5,000 watt (5kW) generator.

For practical purposes, we grouped our home automatic generators into three size categories: small (8-13kW), medium (18-35kW) and large (45-100kW) systems.


Small Size Generators:

Small size generators range from 8-13kW (Specifications Chart) and represent the large majority of our home generators. They are air cooled, typically 2 cylinder NG/LP gas fueled engines that run at 3600 RPM. The generators are located outdoors and are placed on a polymer pad roughly 2’ by 4’. They have a heavy gauge metal weatherproof enclosure with lockable doors and produce a typical noise level between 70-73db at 23 feet (Noise Levels). The generators are permanently connected to the existing fuel source and come with a 50-60 Amp Automatic Transfer Switch (ATS), which also houses the emergency circuits. These systems can support selected critical circuits that could include two (2) gas or oil furnaces, a hot water heater fan, a fridge, a freezer, a water well and an ejector pump, a sump pump, a plug-in microwave, and 5 to 6 15/20 Amp single pole circuits for general lighting, television, computer, telephone and security system. These generators come with a 12V car battery and a battery trickle charge; a battery warmer, and an oil heater are offered as options for cold weather conditions.

Due to the fact that these generators are air cooled and need proper ventilation they cannot be equipped with custom sound-attenuating enclosures to further reduce the noise levels. These generators have appealing enclosures in standard colors such as beige or earth tone.

Larger transfer switches are available as an option but are not recommended for standard applications.

The all inclusive turnkey cost of these systems ranges from $8,000 to $12,000 depending on the size, manufacturer, options, site conditions, and difficulty of installation.


Medium Size Generators:

Medium size generators range from 18-35kW (Specifications Chart) and represent about 25% of our home generators. They are liquid cooled, 4 cylinder, NG/LP gas fueled engines that run at 1800 RPM. The generators are located outdoors and are placed on a concrete pad roughly 3’ by 7’. They have a heavy gauge metal weatherproof enclosure (standard) with lockable doors and can be additionally equipped with a custom sound-attenuated enclosure that reduces the noise level at 23 feet from around 72dB (standard enclosure) to around 56dB (Noise Levels). The generators are permanently connected to the existing fuel source and come with a 100 Amp Automatic Transfer Switch (ATS), and a separate 100 Amp emergency sub-panel that houses the selected critical emergency circuits. These systems can support all the circuits included in the small size generators plus a small (20 Amp) and a medium size (40 Amp) air conditioning units plus 5 to 7 15/20 Amp single pole circuits. For an all-electric home, an electric furnace or heat pump (and fireplaces!) may be substituted for the medium size AC and a water heater may be substituted for either the well/ejector pumps or 2 general circuits.

These generators come with 12V car battery and a bttery trickle charge. Each unit has a block heater to help in cold weather conditions.

For special applications, a 200 Amp transfer switch is offered as an option but only after an engineering evaluation is made of the system details and the electrical loads.

The generators have appealing enclosures that come in standard colors and can be customized as an option to blend in with the house or surroundings. (Process, Pictures)

The all-inclusive turnkey cost of these systems ranges from $17,000 to $25,000 depending on the size, manufacturer, options, site conditions, and difficulty of installation.


Large Size Generators:

Large size generators (a.k.a. whole house generators) range from 45-100kW (Specifications Chart), and represent about 10% of our home generators. They are liquid cooled, 6-12 cylinder, NG/LP gas fueled engines that run at 1800 RPM. They are located outdoors and are placed on a concrete pad roughly 4’ by 9’. They have a heavy gauge metal weatherproof enclosure (standard) with lockable doors and can be additionally equipped with a custom sound-attenuated enclosure that reduces the noise level at 23 feet from 78dB (standard enclosure) to 65dB (Noise Levels). The generators are permanently connected to the existing fuel source and come with a 200-600 Amp Automatic Transfer Switch (ATS) to support the entire house load, even for an all-electric home.

These generators come with a 12V car battery and battery trickle charge. Each unit has a block heater to help in cold weather conditions.

For special applications, a 800-1200 Amp transfer switches are offered as an option but only after an engineering evaluation is made of the system details and the electrical loads.

The generators have appealing enclosures that come in standard colors and can be customized as an option to blend in with the house or surroundings. (Process, Pictures)

The all-inclusive turnkey cost of these systems ranges from $35,000 to $55,000 depending on the size, manufacturer, options, site conditions, and difficulty of installation.



Specifications Chart:
Generally speaking, a small size generator system will be suitable for most applications where homeowners are looking for basic critical emergency lighting, appliances and equipment. When air conditioning, electric ovens, dryers, other large electrical 240V appliances are added, or when special requirements are specified (such as noise ordinances, etc.), then a medium size system is recommended. When a substantial portion or the entire house load is needed for total security and comfort, then a large size system is recommeded.