Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 14-03-2019, 08:23   #76
Marine Service Provider

Join Date: Jan 2012
Location: Lake Ontario
Boat: Douglas 32 Mk II
Posts: 2,833
Re: I'm running a 12v bilge pump on a 24v system

I don't know whether to laugh or cry.

This is a fine example of what today's "instant google experts" can achieve.

Mass confusion and public misinformation.

First, this is an electrical system question. If one accepts false info and makes an error, it can bite them, HARD, like property damage, personal injury or death.

Second, this is a safety device question. If one makes an error with their bilge pump, it can bite them, HARD, like property damage, personal injury or death.

Folks, unfortunately it comes down to this:

1. Some who have answered, know they don't know. Don't accept their advice.

2. Some who have answered, think they know. Don't accept their advice.

3. Some who have answered, are sure they know. Don't accept their advice.

4. If you absolutely do know the answer to a question like this, refer the person to someone local who is a "real" expert, because if they try to post the correct answer, they will be bombarded with ridiculous claims from all the people in the other categories above, that could care less if their advice hurts anyone else, and who have absolutely no skin in the game.

It's sad, but this is the way it often turns out.

If the OP still seeks a correct opinion on this question, a "real" expert will carry commercial liability insurance, just in case, despite all of their education, training, and experience, and investment into their skill and craft, they make a mistake and accidentally kill someone.

Even still, this person doesn't have as much skin in the game as you do.

Once you find them, you now have someone to go to when you need "real" expert advice on matters that a mistake could bite you, HARD! (And it will take far less time than sifting through all of this nonsense, that if you don't already know the answer, couldn't possible discern what is correct or incorrect.)

Then again, if you are willing to "hack" a safety system on your boat, that you, your loved ones, and everyone around you in the boating community are counting on functioning properly and safely, this is the thread for you.

Willing to play electrical system Russian Roulette? Just pick a response and try it.
__________________

__________________
ramblinrod
ramblinrod is offline   Reply With Quote
Old 14-03-2019, 10:05   #77
Marine Service Provider

Join Date: Jan 2012
Location: Lake Ontario
Boat: Douglas 32 Mk II
Posts: 2,833
Re: I'm running a 12v bilge pump on a 24v system

Quote:
Originally Posted by coopec43 View Post
Fuss
You might be interested in this


https://www.metmotors.com/a-12v-dc-m...sus-24v-motor/
Dude, electrical device specs (especially bilge pumps) are based on supply voltage.

Change the voltage, the specs are no longer applicable.

Note that a bilge pump rated output is at 13.2 Vdc pump terminal voltage, open discharge.

If a 12 Vdc nominal electrical system charging system is on, the voltage could be as high as 14.6 Vdc (less any voltage drop to the pump motor) and it will draw more current, run faster and pump more.

If the batteries are down to 12.2 Vdc it will draw less current, run slower and pump less.

No worries as 12 Vdc (nominal) bilge pump is designed to run under these conditions.

Will it operate at 12 Vdc nominal. Maybe. If it has proper over-current protection (for 12 Vdc operation) it may trip it PDQ. If it doesn't it will run faster and dissipate more energy that it was designed for. It may burn up or wear out sooner. How soon? How long is a piece of string?
__________________

__________________
ramblinrod
ramblinrod is offline   Reply With Quote
Old 14-03-2019, 10:56   #78
Marine Service Provider

Join Date: Jan 2012
Location: Lake Ontario
Boat: Douglas 32 Mk II
Posts: 2,833
Re: I'm running a 12v bilge pump on a 24v system

Quote:
Originally Posted by ramblinrod View Post
Dude, electrical device specs (especially bilge pumps) are based on supply voltage.

Change the voltage, the specs are no longer applicable.

Note that a bilge pump rated output is at 13.2 Vdc pump terminal voltage, open discharge.

If a 12 Vdc nominal electrical system charging system is on, the voltage could be as high as 14.6 Vdc (less any voltage drop to the pump motor) and it will draw more current, run faster and pump more.

If the batteries are down to 12.2 Vdc it will draw less current, run slower and pump less.

No worries as 12 Vdc (nominal) bilge pump is designed to run under these conditions.

Will it operate at 12 Vdc nominal. Maybe. If it has proper over-current protection (for 12 Vdc operation) it may trip it PDQ. If it doesn't it will run faster and dissipate more energy that it was designed for. It may burn up or wear out sooner. How soon? How long is a piece of string?
Crap! See, even a real expert can make a mistake when in a rush to get out the door, first sentence, last paragraph should have read...."Will it operate at 24 Vdc nominal?
__________________
ramblinrod
ramblinrod is offline   Reply With Quote
Old 14-03-2019, 12:20   #79
Registered User

Join Date: Feb 2017
Location: Panama, Central America
Boat: CT 49, 1989
Posts: 645
Re: I'm running a 12v bilge pump on a 24v system

Quote:
Originally Posted by ramblinrod View Post
I don't know whether to laugh or cry.

This is a fine example of what today's "instant google experts" can achieve.

Mass confusion and public misinformation.

First, this is an electrical system question. If one accepts false info and makes an error, it can bite them, HARD, like property damage, personal injury or death.

Second, this is a safety device question. If one makes an error with their bilge pump, it can bite them, HARD, like property damage, personal injury or death.

Folks, unfortunately it comes down to this:

1. Some who have answered, know they don't know. Don't accept their advice.

2. Some who have answered, think they know. Don't accept their advice.

3. Some who have answered, are sure they know. Don't accept their advice.

4. If you absolutely do know the answer to a question like this, refer the person to someone local who is a "real" expert, because if they try to post the correct answer, they will be bombarded with ridiculous claims from all the people in the other categories above, that could care less if their advice hurts anyone else, and who have absolutely no skin in the game.

It's sad, but this is the way it often turns out.

If the OP still seeks a correct opinion on this question, a "real" expert will carry commercial liability insurance, just in case, despite all of their education, training, and experience, and investment into their skill and craft, they make a mistake and accidentally kill someone.

Even still, this person doesn't have as much skin in the game as you do.

Once you find them, you now have someone to go to when you need "real" expert advice on matters that a mistake could bite you, HARD! (And it will take far less time than sifting through all of this nonsense, that if you don't already know the answer, couldn't possible discern what is correct or incorrect.)

Then again, if you are willing to "hack" a safety system on your boat, that you, your loved ones, and everyone around you in the boating community are counting on functioning properly and safely, this is the thread for you.

Willing to play electrical system Russian Roulette? Just pick a response and try it.
Very true words that there is a lot of advice on here isnt correct.

Its also true that there is also some very good advice being offered on here.

Its also true that SOME local technicians are very good.

But its also true not all local technicians give the correct answers or do the best work.

As always the trick is to decide who is which.

In my experience its usually the ones telling us they have all the answers talk a good story. And the ones that do actually know more are more reluctant to offer their opinion.
__________________

Q Xopa is offline   Reply With Quote
Reply

Tags
bilge, bilge pump, pump

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
replacing a 12v windlass by a 24v when there's already a 24v bowthuster Brann- Construction, Maintenance & Refit 27 18-05-2017 16:30
48v 36v 24v and 12v system drousy88 Electrical: Batteries, Generators & Solar 31 19-04-2016 16:35
Solar Voodoo ? 24v Panels in a 12v System ? s/v 'Faith' Electrical: Batteries, Generators & Solar 30 03-04-2015 09:20
Running a Refrigerator Compressor on 12V or 24V and more jonahmulski Electrical: Batteries, Generators & Solar 27 09-10-2013 03:02
24v bowthruster on a 12V system James S Construction, Maintenance & Refit 21 30-10-2008 17:21

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:08.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.