CONTESSA 32 ASSOCIATION Homepage
Forum Home Forum Home > Technical Help > Electrical Systems, Navigation and Safety equipment
  New Posts New Posts RSS Feed: Alternators and external regulators
  FAQ FAQ  Forum Search   Calendar   Register Register  Login Login

Alternators and external regulators

 Post Reply Post Reply
Author
Message
david.barrow View Drop Down
CO32 Members
CO32 Members
Avatar

Joined: 05 Jul 2011
Location: midlands
Online Status: Offline
Posts: 7
Post Options Post Options   Quote david.barrow Quote  Post ReplyReply Direct Link To This Post Topic: Alternators and external regulators
    Posted: 17 Jan 2014 at 4:07pm
I am hoping to take my boat to the Azores next summer for a months cruising.

I have read a lot about battery charging with all it complexities. I currently have a 13 year old Yanmar 2GM-F with a 55 amp standard alternator together with a (noisy) Air X wind generator. A few years ago I added another battery so I currently have 310 amp of storage. Whilst the current set up works pretty well I am aware that it could be improved for a much longer offshore passage. I obtained a quote for a somewhat all singing dancing system but it is far too expensive, and probably not really necessary. I could put an 80 amp alternator with the current drive belt +/_ an external regulator.

I have the average amount of electronics, a refrigerated cool box and an SSB.

I would value others thoughts and ideas .

David Barrow
Spirit of Amport  
David Barrow
Back to Top
George Isted View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 08 May 2009
Location: Solent
Online Status: Offline
Posts: 370
Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 2014 at 7:53pm
Hi David,
I have the same engine/alternator + a Sterling advanced regulator so it makes the alternator kick out more amps for much longer.   While a larger alternator will help reduce charging time I think there is more to be gained by making your standard alternator work harder.   The only downside is that you get though alternator drive belts a bit quicker and have to keep an eye on battery water levels.   Suggest you take a look at the sterling website, this is also good http://www.sterling-power.com/images/downloads/advancedcharging.pdf
George Isted
Contessa 32 "Concerto"
Co32 Class Captain and Measurer.
Back to Top
Silver Harmony View Drop Down
CO32 Members
CO32 Members


Joined: 19 Sep 2012
Online Status: Offline
Posts: 19
Post Options Post Options   Quote Silver Harmony Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2014 at 2:45pm
Hi David,

your current set-up sounds perfectly adequate to me. The only recommendations I would get is to put suitable LED bulb(s) in your nav lights if you haven't already and not rely on being able to run your cool box.

I have a 100 W Aquair towing generator which gives an average of 4 Amps on offshore passages. A 400 W Air-X should match or beat that. Since I switched to LEDs I have more electricity than I can use and could probably keep the fridge running without resorting to engine charging. That is with what I would regard as average electronics, although no radar.

With 300 Ah battery capacity you have plenty of reserve, if the Air-X packs up you can turn off the cool box and you'll only have to run the engine for an hour a day to keep them topped up - hardly a disaster on a ~12 day(?) passage.

Have a good trip!
Robert
Silver Harmony
Robert Fox
Contessa 32 "Silver Harmony"
Back to Top
david.barrow View Drop Down
CO32 Members
CO32 Members
Avatar

Joined: 05 Jul 2011
Location: midlands
Online Status: Offline
Posts: 7
Post Options Post Options   Quote david.barrow Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jan 2014 at 11:56am
Thank for all the help and advice

David
David Barrow
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down