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 ________________________________ _______________________________________________ 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
