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-   -   How much power does AC use? Dyno test (https://ecomodder.com/forum/showthread.php/how-much-power-does-ac-use-dyno-test-37764.html)

 Daox 08-17-2019 08:54 PM

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!

 oil pan 4 08-17-2019 10:23 PM

My leaf uses like 1 to 2 Hp.
It is a lexus so it could have a 3 ton A/C.

 MeteorGray 08-18-2019 10:55 AM

Are there any data showing how much gasoline it takes to run a 1 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.

 Stubby79 08-18-2019 11:00 AM

Quote:
 Originally Posted by MeteorGray (Post 604863) 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)

 Hersbird 08-18-2019 11:46 AM

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.

 oil pan 4 08-18-2019 01:24 PM

Quote:
 Originally Posted by MeteorGray (Post 604863) 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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