Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-01-2013, 13:26   #1
Registered User
 
Sulaire's Avatar

Join Date: Oct 2011
Location: Planet earth
Boat: Hans Christian 41
Posts: 189
Adding a second battery charger

Due to various reasons I find myself with 2 sterling pro ultra chargers (50 amp each).

One is already fitted to the boat and working great. I have a second one now and since I have 630 amp house bank plus 70 amp starter linked to a 225amp windlass/thruster battery with an ACR, i thought it would be good to fit the second charger into the system making a total of 100amps charging potential.

I would wire one charger soley to the house bank , (bridging all outputs together), then the second chargerwith two outputs, one to the house bank and one to the charger battery/windlass etc...(again bridging unused third outputon the charger).

Does this make sense ? Am I missing anything safety wise?

Is ther anything I need to allow for when connecting two chargers to one bank ( also have solar and wind going to house! )

We live onboard and if we use the generator to charge due to cloudy days, using these two chargers would mean less running time ?
.?
Charlie.
__________________

__________________
Sulaire is offline   Reply With Quote
Old 17-01-2013, 21:03   #2
Registered User

Join Date: Jan 2013
Posts: 7
Re: Adding a second battery charger

Some thoughts: If your second charger is charging both banks you'd do best with a VSR relay so that it opens when the lower AMPHr bank is charged. Don't want to use a diode for this because of the voltage drop across it. An alternative is to have a voltage regulator like a duo charger that applies the charge to the banks. As for the solar and wind chargers, the big advantage here is that engine chargers are good when at a healthy charging rate, in the early part of the charging cycle, but when that tapers off you're operating at a very low load. That's where the solar and wind chargers are in thier best form. Lower amps but for a longer time. An amp-hour meter can be a good help on this. Bogart Engineering, trimetric meters, used to have a good write-up on how this works.
__________________

__________________
Waltthesalt is offline   Reply With Quote
Old 18-01-2013, 11:42   #3
Marine Service Provider

Join Date: Dec 2003
Location: South Carolina
Boat: Philip Rhodes Custom
Posts: 395
Re: Adding a second battery charger

Yes your plan should work. Make sure that the charging current on either battery does not exceed the maximum rating of the ACR so if one battery is fully charged and all the current is going through the ACR to the other bank it is not overloaded.

You should be able to cut charging time in half and the increased load on the genset is more efficient and good for the diesel engine.
__________________
Andina Marie is offline   Reply With Quote
Old 18-01-2013, 12:04   #4
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 4,038
Images: 4
Re: Adding a second battery charger

The Sterling ProUltra is an excellent battery charger. I've tested them in my shop, and installed them on client's boats.

One of the nice features they have is the ability to chain two of them together to increase total charging output.

That's what I'd do, since if you use the second one to charge only a portion of your batteries, you may not be getting full potential.

I'd just chain the two of them together and get the full potential.

Bill
__________________
btrayfors is offline   Reply With Quote
Old 18-01-2013, 13:25   #5
Registered User
 
Sulaire's Avatar

Join Date: Oct 2011
Location: Planet earth
Boat: Hans Christian 41
Posts: 189
Hi


When you say chain them together, do you mean just as I described?

C.
__________________
Sulaire 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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:19.


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.