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Old 07-01-2015, 07:01 AM   #29
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Quote:
Originally Posted by MattTaylor View Post
I must be confused.

1 BTU/hr = 0.29307107 Watts
17,500 BTU/Hr = 5129 Watts

How is it that a 3100 watt generator can run a 17,500 BTU AC Unit?

I think the problem with your calculations is a misstatement in the AC size. I am thinking it is more like a 13,500 BTU or possibly 15,000 but I think the first one is correct.


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Old 07-01-2015, 12:45 PM   #30
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One poster was asking about setting the genset on it's side...


Bad Idea! All engines need to vent the crankcase, typically a baffel and then a hose up to the air cleaner. Sitting it on it's side could possibly drain oil into the air cleaner, Also the fuel in the float bowl would also leak into the carb. and also possibly leak into the cylinder.


Thanks to the OP for the write-up!
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Old 07-04-2015, 08:10 AM   #31
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I purchased a Champion 3000 watt inverter generator after reading the post on this and other forums and am very happy with my purchase.
We used it the first time at the NCOWS national shoot in Evansville, we had some friends who camped in a wall tent and we set under there tent fly visiting most every night with our generator running, while you could hear it you could still hold a conversation with no trouble. We would run it during the day to cool the camper and charge batteries but shut it down at bed time. My next purchase/install will be a 1500 watt inverter so we can run the living room ceiling fan and a table fan in the bedroom at night.
So for the price the Champion inverter generator is nice.
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Old 07-05-2015, 01:53 PM   #32
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My next purchase/install will be a 1500 watt inverter so we can run the living room ceiling fan and a table fan in the bedroom at night.
Two 12v fans would be soooo much cheaper. And save a lot of generator fuel.
12V Fans, Portable Fans, Camping Fans, RV Fans - Camping World
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Old 07-05-2015, 02:08 PM   #33
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Two 12v fans would be soooo much cheaper. And save a lot of generator fuel.
12V Fans, Portable Fans, Camping Fans, RV Fans - Camping World
Check those fan's of yours you should be able to run a ceiling fan for a couple hundred watt invertor.. and the table fan to.
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Old 07-05-2015, 02:10 PM   #34
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Check those fan's of yours you should be able to run a ceiling fan for a couple hundred watt invertor.. and the table fan to.
100 watts
Floor or box fan (high speed)
90 watts
52" ceiling fan (high speed)
75 watts
48" ceiling fan (high speed)
55 watts
36" ceiling fan (high speed)
24 watts
42" ceiling fan (low speed)
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Old 07-05-2015, 02:26 PM   #35
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Quote:
Originally Posted by MattTaylor View Post
I must be confused.

1 BTU/hr = 0.29307107 Watts
17,500 BTU/Hr = 5129 Watts

How is it that a 3100 watt generator can run a 17,500 BTU AC Unit?
Because A/C's are heat pumps, that is it's moving 17,500 BTU from inside to outside, it's not making 17,500 BTU of heat.

All A/C's have a COP of greater than 1, meaning they move more heat than the energy they consume. Incidentally that is why a heat pump run the other way to heat is more efficient than a 100% efficient heat strip, it's not making heat, rather pumping it from one place to another.

An average 17,500 btu a/c requires about 1700 watts so it has a COP of about 3, or 300% efficient, pretty typical.

https://en.wikipedia.org/wiki/Coeffi...of_performance
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