Edd, To Joe's point, 30Hp is ~22000 watts and a typical electrical outlet is 1850 watts. So the engine has plenty of power to do what you are asking. The problem with most diesel engine installations is that the engines need to be run at 80% load for hours in order to prevent cylinder glazing and carbon fouling. Your A/C won't even make it to 10% load.
To your point, yes it will probably work. I don't know if you have ever reached max output from the alternator but what many people experience is that the belts slip at max alternator output. In order to reduce belt slip they tighten the belt. This increases belt wear and side loading of the alternator and main crank bearings. Better alternative is to upgrade to a serpentine. Most people who want to run A/C while away from shore will simply get a small Honda 2000 generator. Of course this means gasoline and associated hazards on board. Another consideration would be a small marine diesel generator. 2 or 3 kw are not terribly expensive. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sat, Sep 19, 2020, 11:13 Edd Schillay <e...@schillay.com> wrote: > Joe, > > Thanks. I wasn’t looking to run all night at anchor. I was only thinking > if we were moving under power with little to no breeze behind us, if it > were possible to cool down the cabin a little, or at least get some relief > standing in front of a vent for a short time. > > 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 > ———————————————- > 914.774.9767 | Mobile > ———————————————- > Sent via iPhone 11 Pro > iPhone. iTypos. iApologize > > > On Sep 19, 2020, at 11:01 AM, Joe Della Barba <j...@dellabarba.com> wrote: > > > > That would be a marginal operation at best. The most benign thing that > would go wrong would be the inverter overheating and shutting down. If that > doesn't happen, running an alternator that hard for hours on end is pretty > tough duty, I would not be surprised if the alternator died an early death. > > The worst case scenario is trying to run the AC at anchor. Long ago I > dealt with a company that was selling 3 KW AC generators that belted off > the main engine. End result was people running their engines all night to > run the AC and carbon fouling them to death. > > > Joe > > Coquina > On 9/19/2020 10:24 AM, Edd Schillay wrote: > > 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 > ———————————————- > 914.774.9767 | Mobile > ———————————————- > Sent via iPhone 11 Pro > iPhone. iTypos. iApologize > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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