Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-01-2008, 15:04   #31
Registered User
 
skipperaris's Avatar

Join Date: Apr 2006
Location: Nafplio, Greece
Boat: Gib'Sea, 422, 42 ft, Erato
Posts: 176
Images: 1
Send a message via Yahoo to skipperaris Send a message via Skype™ to skipperaris
Alternator specs

Quote:
Originally Posted by seafox View Post
hi there
why does a 115amp alternator only put out 10 amps? Shouldn't it be called a 10 amp alternator?
I only just got the email to tell me about your posting and I see that you already have lots of technical explanations which are very good.

In case you are still wondering, however, I will add my explanation - phrased so as to appeal to common sense - which is: when you buy a 115 hp car you will only get this much power at the motor shaft when you are going at top speed uphill with the whole family including the mother in law - lots of torque - with gas pedal down to the floor. Anything less will give you less power.

The equivalent of the car engine speed is the alternator (boat motor) speed.
The equivalent of engine torque is the demand the alternator seeks to meet, which is the reason for running your inverter (coffee maker) while running your motor to charge the batteries.

You need to understand that the alternator "sees" total demand and it may be sobering for our portuguese friend to realise that his alternator will be hard pressed to meet the 1200 W of his coffee maker. It may be comforting to know that at full output the alternator will be pushing out maybe 14 Volts instead of the nominal 12 Volts. So the coffee will be brewed before the alternator is cooked.

Hope this twopence worth of extra helps somebody to understand all the more technical stuff offered by our learned friends.
__________________

__________________

skipperaris

web site
skipperaris is offline   Reply With Quote
Reply

Tags
generator, inverter

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverter Interference Salacia Electrical: Batteries, Generators & Solar 17 05-05-2011 12:23
Kipor Generators rsn48 Electrical: Batteries, Generators & Solar 33 11-10-2010 03:35
Any way to convert a DC Generator to an AC Generator? Latitude9.5 Engines and Propulsion Systems 13 06-04-2007 12:06
kipor generators KevinE Electrical: Batteries, Generators & Solar 16 04-05-2006 19:45
New Inverter Question Greg B Electrical: Batteries, Generators & Solar 2 09-08-2004 13:37



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.