Its not running the A/C that will be a problem.  Its starting it up.  If you 
watch your amp draw when tied into the 110v, you will see a sharp spike upon 
start-up (I forget how much) and then settles down when running.  I would bet 
that the A/C will trip the inverter at start-up.

From: T Sutton via CnC-List <cnc-list@cnc-list.com>
Sent: Saturday, September 19, 2020 11:14 AM
To: Stus-List <cnc-list@cnc-list.com>
Cc: T Sutton <t.sut...@bmts.com>
Subject: Stus-List Re: Alternator / Inverter / Air Conditioning

I’d say so. What is the watts drawn by the hairdryer? I just checked my wife’s 
and it was 1600W and I’m guessing yours is probably 12-1500W but that is for a 
relatively short period of time.  If the A/C is peaking at 1400W then it will 
probably start to drain the batteries slowly since the alternator is putting 
out the equivalent of about 1200W.  Subject to rounding error and losses in the 
equipment (Wire runs, inverter etc.) when you step the 12V up to 120V the 
current required is also a factor of ten so it takes 120A at 12V to supply the 
12A at 120V to give you 1400W. Like Joe says you are pretty much running at 
capacity so it may affect the longevity of the equipment and definitely don’t 
let your wife dry her hair if the A/C is running.  LOL

Cheers,

Tom S

From: Edd Schillay
Sent: Saturday, September 19, 2020 10:24 AM
To: Stus-List
Subject: Stus-List Alternator / Inverter / Air Conditioning

Listers,

As some of you already know, we installed air conditioning on the Enterprise a 
couple of months ago. We are currently at the dock on Captiva Island and the 
cabin is a glorious 75 degrees.  According to the installer, at startup and 
maximum compression, the air conditioning on the boat will draw 1400 Watts.

Years ago, when I repowered the boat with a new Beta 30 engine, I added a 120A 
alternator and a 2000W inverter, mostly so my wife can use her hairdryer when 
under way.

My AC panel is switchable between Shore Power and the Inverter’ power.

So here’s the question: Do you think it’s possible to actually run the air 
conditioning with the engine running? The math seems to work, but I am hesitant 
to give it a try.

And, if it doesn’t work, what would actually happen? Are we talking a tripped 
breaker or something bad like alternator issues.

Signed,

Clueless in Captiva.

All the best,

Edd

———————————————-
Edd M. Schillay
Captain of the “Starship Enterprise”
C&C 37+ | Sail No.: NCC-1701-B
Venice Yacht Club | Venice Island, FL
www.StarshipSailing.com<http://www.StarshipSailing.com>
———————————————-
914.774.9767   | Mobile
———————————————-
Sent via iPhone 11 Pro
iPhone. iTypos. iApologize

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