×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Is discrete charging of series connected batteries OK?

Is discrete charging of series connected batteries OK?

Is discrete charging of series connected batteries OK?

(OP)
I have a 24v 'house' system made up of a pair of 12 volt Lead Acid Auto batteries. I have a multi output 12v Victron marine charger.  
Is there any reason why I cannot/should not hookup each 12v battery to it's respective charge input and keep it all running? e.g. continue to use the 24v system.
To my mind this is should be a better solution than a 24v charger covering the pair as it allows for the individual battery condition to be monitored by the charger. Am I missing something? Cheers, Paul

RE: Is discrete charging of series connected batteries OK?

Read the booklet that came with the charger.  
What does it say?
 

Mike Halloran
Pembroke Pines, FL, USA

RE: Is discrete charging of series connected batteries OK?

(OP)
Manuals and website make no comment on this situation. I have not found any information specific to this idea. Cheers

RE: Is discrete charging of series connected batteries OK?

You could meet us halfway and tell us the model of the charger... so anyone already familiar with it might speak up, or one of the dedicated crazies might read up on it and offer an educated opinion.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Is discrete charging of series connected batteries OK?

Nope, you can't do what you want.  On page 6:
"                  The -DC is used common for all
three batteries.   "

You need a charger that has a + and a - for each battery, and that specifically states that the outputs are isolated from each other.




 

Mike Halloran
Pembroke Pines, FL, USA

RE: Is discrete charging of series connected batteries OK?

(OP)
Thanks Mike,
I can see the problem now.
That explains why using two 12v chargers has worked fine on the 24v bank in the past but the Victron will not. FYI. I do not own the Victron but had the option if the system was workable so will not take up the option.
So here is the question I am still seeking a clarification on.

Is charging discretely, no common ground, a good idea or better or worse  than charging as a 24v bank?

Cheers
Paul

RE: Is discrete charging of series connected batteries OK?

The ideal would be to charge and monitor each individual cell.. well, it would be if you could replace them individually.

From the standpoint of detecting incipient failure of one battery early, two 12V chargers with isolated outputs make sense.  

If that costs a lot of money, or you replace the batteries on a time basis anyway, then a single 24V charger makes sense.

 

Mike Halloran
Pembroke Pines, FL, USA

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close