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 > Generator Question?

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nickthehunter

Southgate, MI

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Posted: 12/08/16 02:15pm Link  |  Quote  |  Print  |  Notify Moderator

How big of a generator do I need to run my 15K BTU air conditioner? Assuming I may also be running a coffee pot or microwave at the same time.

2oldman

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Posted: 12/08/16 02:21pm Link  |  Quote  |  Print  |  Notify Moderator

What size gen do i need? 2011
What size.. 2013
Which gen.. 12/2013

hbillsmith

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Posted: 12/08/16 04:04pm Link  |  Quote  |  Print  |  Notify Moderator

Champion 3100 or similar. Turn off A/C while running Microwave then just turn the A/C back on. For such a short period you'll be cool enough. Otherwise you need a 5500 or similar and those weigh around 200#.


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wing_zealot

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Posted: 12/08/16 04:56pm Link  |  Quote  |  Print  |  Notify Moderator

hbillsmith wrote:

Champion 3100 or similar. Turn off A/C while running Microwave then just turn the A/C back on. For such a short period you'll be cool enough. Otherwise you need a 5500 or similar and those weigh around 200#.
would it make a difference if it was a coffee pot that he was using and it was on for like an hour or so?

DrewE

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Posted: 12/08/16 06:18pm Link  |  Quote  |  Print  |  Notify Moderator

wing_zealot wrote:

hbillsmith wrote:

Champion 3100 or similar. Turn off A/C while running Microwave then just turn the A/C back on. For such a short period you'll be cool enough. Otherwise you need a 5500 or similar and those weigh around 200#.
would it make a difference if it was a coffee pot that he was using and it was on for like an hour or so?


It depends on the coffee maker. Some use about as much power as a microwave (or close enough), and some small single serving coffee makers are only 300W. (Obviously a stovetop percolator uses no electricity on a gas stovetop.) I think most coffee makers with a hot plate to keep the coffee warm don't use a huge amount of power for the warmer, but do use considerably more during the brew cycle, so it shouldn't be a problem to turn the air conditioner back on once the brewing is complete.

I think the Onan 4K in my motorhome will run the air conditioner and microwave simultaneously, though I am not sure I've actually tried that combination. It does do a 1500W electric heater and the microwave (and converter/fridge) together, though it sounds a bit strained in the process. It might well benefit from a bit of tuning up/maintenance.





The_real_wild1

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Posted: 12/08/16 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

Go with a 4k or bigger.

Isaac-1

SW Louisiana

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Posted: 12/08/16 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

There are a lot of it depends,but I can tell you the 4000 watt Onan Micro-quiet (yeah right) in mine will power the 13,500 btu air conditioner and the mircowave / convection oven either in microwave or convection mode at the same time. Can't help on the coffee pot though as I rarely drink the stuff.

2gypsies

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Posted: 12/08/16 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

Turn off the air if using the microwave or coffee pot. Also... there are excellent stove-top coffee pots. They make great coffee.


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theoldwizard1

SE MI

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Posted: 12/08/16 08:54pm Link  |  Quote  |  Print  |  Notify Moderator

nickthehunter wrote:

How big of a generator do I need to run my 15K BTU air conditioner? Assuming I may also be running a coffee pot or microwave at the same time.

If you insist on running all 3, you are going to need a >3,500W !

tatest

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Posted: 12/09/16 01:12am Link  |  Quote  |  Print  |  Notify Moderator

4KW. It can run with a coffee pot, toaster, small RV microwave assuming the A/C is running and not trying to start. It might not run a blow dryer and curling iron at the same time as the A/C is running, that combo can be a heavier load than RV microwave (and coffee maker loads depend on what point in the brewing cycle).

With 4KW of genset, the 30 amp main for the whole RV is likely to pop before you overload the generator. Your house limit is usually 3.6 KW.

When my women start running their morning grooming and breakfast appliances it is usually a tossup whether the 30 amp breaker in the RV or the 30 amp breaker at the power post is the first to go. They blow breakers in my house too, usually too much on a branch circuit, as in trying to blow dry under the heat lamps.

For the A/C alone, Coleman sets 30 amp service, 4KW genset, as minimum for their 15K BTU/hour A/Cs and heat pumps. Brief starting loads go 2-4 times that capacity, and only the larger gensets have enough spare rotational energy to handle the overload.


Tom Test
Itasca Spirit 29B


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