Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rating: Thread Rating: 3 votes, 5.00 average. Display Modes
Old 30-03-2006, 17:40   #16
Registered User
 
capt lar's Avatar

Join Date: Feb 2005
Location: Cape Cod
Boat: currently "on the beach"
Posts: 729
Images: 12
Gord said - By way of comparison, a small 3" Bilge Blower would be capable of venting about 100 cfm, in a typical installation.

My Bristol came with a similar set up for another purpose, propane HW heater. The heater is now going, replaced with an Isotemp, but the vent in the bilge may remain. It is an easy way to move air thru the bilge, which is useful for a number of reasons, including Sean's batteries.
As to the batteries, and despite the thread on SSCA, I am changing over to AGM's. My electrician says, if I monitor and maintain, they are still better in many ways, and I can increase my amps without rebuilding boxes. We will see. Since the boat came with a big acid burn on the sole, I was motivated to move away from wet.

Larry
__________________

__________________
Larry

We have met the enemy and he is us. - Walt Kelly
capt lar is offline   Reply With Quote
Old 31-03-2006, 03:35   #17
Marine Service Provider

Join Date: Dec 2003
Location: South Carolina
Boat: Philip Rhodes Custom
Posts: 395
This site has a battery vent fan that fits in a 2" PVC pipe plus an automatic controller that turns it on when the battery is charging and runs it for an additional 15 minutes after the charger goes into a float mode.

Battery vent fan and other items
__________________

__________________
Andina Marie is offline   Reply With Quote
Old 31-03-2006, 05:12   #18
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,579
Images: 240
My previous advise, to not worry about venting, was based upon the use of a typical Bilge Blower Fan. These units are large, noisy, & power hungry, requiring a minimum of 3" dia. vent pipe.

I take it all back - and, once again recommend installing a Batt’ Box Vent Fan.

Thanks to Andina Marie, for the heads up ion the Zephyr Vent Fan!

The manufacturer’s website has a lot more information at Zephyr Industries Battery Box Ventilator:
http://zephyrvent.com/

I’ll be returning to this subject (soon ?), with a more detailed statement and recommendation.

Sorry for waffling (flip-flopping) ...

Gord
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 01-04-2006, 10:49   #19
Registered User
 
JGI417's Avatar

Join Date: Mar 2005
Location: Tulsa OK
Posts: 59
I agree with the corrosive issure, depending where they are located I think this could cause problems.
__________________
John
JGI417 is offline   Reply With Quote
Old 01-04-2006, 19:58   #20
Registered User
 
coot's Avatar

Join Date: Feb 2006
Posts: 367
Images: 2
Quote:
Originally Posted by ssullivan
Question: I'm not sure what I'm missing regarding the Trojan T-105's. I did a lot of research. I read that the 6V T105's are each rated at 225ah. I assumed that they retained that rated when I hooked them up in series to produe 12V. This isn't true?
It is true that each battery has the same capacity, but...

In a typical boat, everything is a 12 volt system, so you can get away with talking about amp-hours. The thing that is getting you is this: amp-hours is only meaningful when everything has the same voltage. You cannot compare the 6 volt amp-hours with the 12 volt amp-hours.

The real physical entity is watt-hours. watts = volts times amps. watt hours = volts times amps times time.

Your T-105 contains 225 AH at 6 volts, for a total of 6 * 225 = 1350 watt-hours. Use two batteries and you have 1350 * 2 = 2700 watt-hours.

But how do you draw the power out? In series, you draw 12 volt power. 2700 watt-hours / 12 volts = 225 AH at 12 volts.

( In parallel, you draw 6 volt power, and 2700 watt-hours / 6 volts = 450 amp-hours at 6 volts. )

If you have four of them, you probably have two banks of two batteries in series, for a total of 5400 watt-hours, which comes to 450 AH at 12 volts. If you sized your charger for 900 AH (and it sounds like you did), you can put another two or another four batteries, for 675 or 900 AH respectively.
__________________
Mark S.
coot is offline   Reply With Quote
Old 05-04-2006, 13:27   #21
cruiser

Join Date: Nov 2004
Posts: 4,525
Thanks, Mark. I don't know where my brain was during that post. I was exhausted. We are very close to being done with the boat, and this week's early season charter is going well!

I will be finishing everything up by the end of April and will have many MANY photos to post as soon as the gallery is back.

Thanks again for all your help with the charging situation. It appears to be working well... but I have yet to fully test it (by unplugging the unbillical cord..)



Quote:
Originally Posted by coot
It is true that each battery has the same capacity, but...

In a typical boat, everything is a 12 volt system, so you can get away with talking about amp-hours. The thing that is getting you is this: amp-hours is only meaningful when everything has the same voltage. You cannot compare the 6 volt amp-hours with the 12 volt amp-hours.

The real physical entity is watt-hours. watts = volts times amps. watt hours = volts times amps times time.

Your T-105 contains 225 AH at 6 volts, for a total of 6 * 225 = 1350 watt-hours. Use two batteries and you have 1350 * 2 = 2700 watt-hours.

But how do you draw the power out? In series, you draw 12 volt power. 2700 watt-hours / 12 volts = 225 AH at 12 volts.

( In parallel, you draw 6 volt power, and 2700 watt-hours / 6 volts = 450 amp-hours at 6 volts. )

If you have four of them, you probably have two banks of two batteries in series, for a total of 5400 watt-hours, which comes to 450 AH at 12 volts. If you sized your charger for 900 AH (and it sounds like you did), you can put another two or another four batteries, for 675 or 900 AH respectively.
__________________

__________________
ssullivan is offline   Reply With Quote
Reply

Tags
battery

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
RF Noise from Mastervolt Alpha Pro BachAndByte Electrical: Batteries, Generators & Solar 4 21-08-2004 05:33
BATTERY VALUE GordMay Electrical: Batteries, Generators & Solar 5 17-07-2003 22:42
Outboard engine and solar power charging THamel Construction, Maintenance & Refit 2 19-05-2003 23:28



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:44.


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.