I have a Coleman mach3 rooftop and was wondering what running watt of a generator would run this along with it a full size frig and freezer microwave and a few lights? I am interested in buying a 7000 watt which it has a running watt of 6500. Is this generator sufficient enough?

minimum 3500 watts, preferable 4000 watts.

Midwest USA... A working generator in good running condition should sell for around $0.05 a watt +-, so 7500x0.05= $375. Excellent condition add a penny. NOS add another penny.

A working generator in poor condition 3 cents/watt.

A generator that doesnt work, i.e. engine doesn't run or engine runs but no electrical power is $0 to $50. Repair costs of some generators cost more than a new one.

As for operational status, the typical shop vacuum makes a handy load tester. The shop vac load along with a "Kill A Watt" power monitor will provide an independent voltage and frequency analysis.

Be sure to plug the vacuum into every outlet and if any outlet doesn't work consider the unit non-working.

Coleman Powermate Generator 5000 Watts / 6250 Watts ...

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Hello, I have the same exact generator, 2400 Yamaha. It works fine for my Ac, and then some. After it first kicks on, is the biggest surge. Then I have even after ac is running, I have had tv on and even used microwave. But as far as running you ac on your rv , not problem. I do it all the time. Mine is ulta quite, and 8 to ten hours run time on about a gallon of fuel. Mike

Yes, scrap it and buy a new non-Colman generator.

-Mark

If it has been in storage with gas in it. it is gunked up. Need to remove carburetor and take to someone to clean carb.

this is normal, do not worry that harmonic vibration type noise just tells me that the unit has a full freon charge and is running great, sit back and enjoy

When they sit allot - sometimes the fan will stick.. Take the cover off,, turn it on and see if the fan is stuck.. Spin it by hand to free it up..

On average, a rooftop unit with pull 14 to 16 amps depending on the ambient temperature. I am not sure how big your microwave is but we will assume 1000W. The TV really doesn't pull that much. So, you have 16 amps at the Air Conditioner, 8.5 Amps at the Microwave and we will say 5 amps at the TV. Lets not forgot the converter for the coach which pulls 3 to 5 amps on average. Add all of these amps together and you have 34.5 on the high end. To get the size Wattage of generator needed to run 34.5 amps, you take 34.5 and multiple it by the electricity source, in your case 120V. That means that you have 4,140 Watts of power to be used max. I think that with a 4000 watt generator, you will be fine. You may be able to go a little bit smaller if your microwave is not that large. To find the amps of the microwave that you have, take the wattage and divide it by 120. That will give the average amps that it pulls while running.

Hope this helps,

Jeff

both sizes will handle that stuff as long as generator maintains a constant rpm. otherwise you run risk of low voltage or voltage spikes which cpu will not handle for very long