Josh, I did buy the upgraded alternator with the Beta Engine (120amp). The idea was that, if needed, a warm shower could be taken and my wife could use her hair dryer if the engine is running. These would be rare circumstances though since when we do extended cruises, we like to be dockside.
On shore power, it would be perfect. (I hope) Will let you know how it all works once I get it all hooked up — probably for the 2016 season. All the best, Edd Edd M. Schillay Starship Enterprise C&C 37+ | Sail No: NCC-1701-B City Island, NY Starship Enterprise's Captain's Log <http://enterpriseb.blogspot.com/> > On Sep 2, 2015, at 10:38 AM, Josh Muckley via CnC-List > <cnc-list@cnc-list.com> wrote: > > I did some rough math and it looks like you'll need ~38Ahrs of power for a 15 > minute shower. Your inverter will be drawing 150amps through the supply > wires and your alternator would have to recharge that amount. With the stock > alternator (35amps) it would take over and hour. I do think I remember you > having an upgraded alternator. Of course the assumption was that the hot > water was at full flow for the 15 minute duration. > > The instant waterheater is just a resistive load. It would be more efficient > and possibly safer to eliminate the inverter from the picture. It would take > some electrical and electronics skills to re-engineer the unit to run on 12v > instead of 120v. > > That new water heater really is shockingly smaller. You'll have to let us > know how it turns out. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > On Aug 31, 2015 10:15 AM, "Edd Schillay via CnC-List" <cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com>> wrote: > My hot water tank was failing as well and I’m in the middle of putting in a > replacement — the hard part was getting the old one out of the tight space > under the galley. > > I decided to go with an on-demand water heater which will either be powered > by shore power or an inverter (2000W) while the engine is running. Here’s the > one I picked: > http://m.rakuten.com/product/263816304?listingid=337903396&adid=29963&sclid=pla_google_Zoro > > <http://m.rakuten.com/product/263816304?listingid=337903396&adid=29963&sclid=pla_google_Zoro> > > > And here is old and new side-by-side: > https://dl.dropboxusercontent.com/u/15162917/ENTERPRISE/heaters.jpg > <https://dl.dropboxusercontent.com/u/15162917/ENTERPRISE/heaters.jpg> > > I’ll try to finish it up over the next couple of weeks, but if not, it’ll be > a quick winter project. > > > All the best, > > Edd > > > Edd M. Schillay > Starship Enterprise > C&C 37+ | Sail No: NCC-1701-B > City Island, NY > Starship Enterprise's Captain's Log <http://enterpriseb.blogspot.com/> > >
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