Reply
 
Thread Tools Search this Thread
 
Old 08 April 2013, 16:08   #31
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by ncp View Post
Using Circuit Wizard - Blue Sea Systems
In: 24v, 50A, 6ft., 3% drop, Variable Load, 105 degrees, engine room checked, it says 10 gauge
Out: 12v, 40A, 6ft., 3% drop, Variable Load, 105 degrees, engine room checked, it also recommends 10 gauge
24V@50A input, 12V@40A output?

That implies the you're consuming 1200 watts from your 24V feed, getting 480 watts for your 12V, while burning 720 watts in the converter itself.

You sure about those numbers? It might be, but something sure sounds wrong to me.

jky
__________________

__________________
jyasaki is offline   Reply With Quote
Old 08 April 2013, 16:19   #32
ncp
Member
 
ncp's Avatar
 
Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,191
Quote:
Originally Posted by jyasaki View Post
24V@50A input, 12V@40A output?

That implies the you're consuming 1200 watts from your 24V feed, getting 480 watts for your 12V, while burning 720 watts in the converter itself.

You sure about those numbers? It might be, but something sure sounds wrong to me.

jky
Nope, but that's why I ask. I understand V = I x R.

The 24v+ coming from my alternator goes through a 50A circuit breaker beofre getting to the DC-DC converter. So, I assume that's the max that I'd be sizing for. I honestly don't know how many amps the 24v Delco alternator puts out.

My DC-DC converter puts out 40A at 12v per the spec sheet.
__________________

__________________
ncp is offline   Reply With Quote
Old 09 April 2013, 11:28   #33
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
OK; the breaker is likely oversized (no problem if the wiring can handle it.)

I thought you were working of the specs of the converter, which wouldn't make a lot of sense.

jky
__________________

__________________
jyasaki is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:23.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.