Load numbers for marine air A/C systems?

willo

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Apr 8, 2020
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Anyone have good numbers for marine air A/C units?
I'm wondering about start-up draw - aka soft start needed and overall loads.

I'm just napkin drawing systems in my head for the future sailboat and this kind of data would be lovely.

Cheers.
 

RCinFLA

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Jun 21, 2020
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If it has an AC powered compressor they have same startup surge. The unit's BTU size determines what power you need.

I did a write up on soft starters in one of forum's threads with some drawings of common start-cap boost/softstarters.

 
Last edited:

DDabs

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Jul 17, 2021
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Check out Velair units. I have a new 16k btu unit on my boat and the variable compressor makes the loads extremely low. They are designed to be run off of inverters.
 

Charlie Woods

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Jul 22, 2021
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Anyone have good numbers for marine air A/C units?
These are the numbers you want. All A/C manufacturers publish them.
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LRA - Locked Rotor Amps: The current you can expect under starting conditions when you apply full voltage. It occurs instantly during start up.

RLA - Rated Load Amps: The maximum current a compressor should draw under any operating conditions. Often mistakenly called running load amps which leads people to believe, incorrectly, that the compressor should always pull these amps.

FLA - Full Load Amps: Changed in 1976 to "RLA - Rated Load Amps".

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Here is the label on the A/C atop my RV trailer with these specifications...

lra.jpg
 

Jodi

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Oct 2, 2021
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Look up Mabru DC air conditioner in fort lauderdale they are pricey but are excellent systems
 

willo

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Apr 8, 2020
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I ended up getting a Velair 16k. The load numbers are impressive.
 
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