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Old 08-17-2019, 08:54 PM   #1 (permalink)
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How much power does AC use? Dyno test

Sikky has dyno tested his Lexus ISF with and without air conditioning on. Spoiler alert, he measured a pretty consistent 9 horsepower through the entire RPM range. That is quite a bit of power!


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Old 08-17-2019, 10:23 PM   #2 (permalink)
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My leaf uses like 1 to 2 Hp.
It is a lexus so it could have a 3 ton A/C.
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Old 08-18-2019, 10:55 AM   #3 (permalink)
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Are there any data showing how much gasoline it takes to run a 1 HP load?

Or a 10 HP load?

Wouldn't it be a straight linear trend of fuel amount required per HP load?

Of course, it would have to be measured on the same engine so that differences in efficiency do not influence the fuel used.
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Old 08-18-2019, 11:00 AM   #4 (permalink)
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Quote:
Originally Posted by MeteorGray View Post
Are there any data showing how much gasoline it takes to run a 1 HP load?

Or a 10 HP load?

Wouldn't it be a straight linear trend of fuel amount required per HP load?

Of course, it would have to be measured on the same engine so that differences in efficiency do not influence the fuel used.
It would vary depending on where in the engine's efficiency range it is, which is RPM and throttle dependant. (Ie the engine might be 20% efficient at 3200 rpm at 50% throttle, but only 10% efficient at 2400 rpm and 25% throttle)
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Old 08-18-2019, 11:46 AM   #5 (permalink)
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Cars actually have huge A/C systems. You could run a big 13,500 btu RV A/C on 1800 watts if you could get past the 2800 watt starting current. That is less than 3 hp. My 1800 running watt Westinghouse generator will run full load for probably 8 hours continuous on 1 gallon of gas. So 1/8 gal per hour. I would hope a built in accessory drive on a cay would do better than that.
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Old 08-18-2019, 01:24 PM   #6 (permalink)
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Quote:
Originally Posted by MeteorGray View Post
Are there any data showing how much gasoline it takes to run a 1 HP load?

Or a 10 HP load?

Wouldn't it be a straight linear trend of fuel amount required per HP load?

Of course, it would have to be measured on the same engine so that differences in efficiency do not influence the fuel used.
Yea, yes and yes. Generally speaking once you account for pumping losses.

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