09:08AM | 05/21/07
Member Since: 03/13/07
3 lifetime posts
I live in So. Florida and hurricane season is around the corner. I want to buy a portable generator to power my central A/C only, my concern is sizing it properly so it will handle startup amps. I've contacted several local electricians, all of them have given me different size recommendations anywhere from 6000 to 12000 watts (pretty wide spread). Looking for an opinion from someone in the field or someone who has done this in their home already. I don't know the exact size of the a/c it's only a 1450sq.ft. house, probably no more than 3 tons. It's on a 25 amp breaker and amp draws are the following, compressor-14.1 amps, outdoor fan-.75 amps, indoor fan 1.5 amps. This is a brand new house also. Thanks in advance.

Tom O

12:20PM | 05/21/07
Member Since: 09/17/02
487 lifetime posts
Well, there is no simple answer.

Judging by the load amps for the compressor, your're looking at a 2 hp motor which would put your AC at about 2 to 2 1/2 tons.

You could run this on a 4 kw generator but, and there is always one of those, you need to allow for the large inrush current when the compressor & indoor fan starts up. This is sometimes called "surge watts" by the generator manufacturers and in your case it could approach 15,000 watts.

Some newer AC units have been designed with lower inrush currents. You should go to the manufacturers (of your A/c) website armed with the model number so you could find out more information. You may be able to request some technical assistance from them regarding inrush current.

Many of the generators being sold at home centers do have a "surge" rating and many of them also list how many tons of AC they can start.

You might try visiting the following site for Generac, Make sure you pay attention to the asterisks.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

Deep blue grays like the shade shown in this example "have a nautical, serene feeling," says Amy Hendel, designer for Hend... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon