Cruisers Forum
 


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 14-04-2021, 17:11   #1
Registered User

Join Date: Jan 2009
Location: Juneau, Alaska
Boat: Prout Snowgoose 37
Posts: 159
DC-DC charger recommendation

I'm trying to figure out the best way to charge my engine start battery along with my LIPO4 House bank. It seems the best way to skin the cat here is to use a DC-DC charger. I would think a trickle charger here would be fine, as it is only topping the battery up after a start cycle.

Problem is, the only DC-DC chargers I'm finding are quite spendy ($200 or more) anyone have a recommendation for a basic unit that will keep the house bank isolated from the start side, but still keep the battery charge maintained?

All of my charge sources are wired to only charge the LIPO4 battery, but I could wire it up to enable me to parallel the LIPO4 and the Start battery if necessary via one of the "1-2-both" switches.
Excalibur5 is offline   Reply With Quote
Old 14-04-2021, 17:26   #2
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 4,400
Re: DC-DC charger recommendation

Look in auto stores for basic dc-dc chargers. As long as you can keep them dry, they will be fine. They can be rated as low as 10A.
Reefmagnet is online now   Reply With Quote
Old 14-04-2021, 18:01   #3
Senior Cruiser
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 3,202
Re: DC-DC charger recommendation

Hear go. Another approach is to add an alternator that supplies the starter battery. I use ordinary Delco single wire (internal regulator) alternators on my main engine and genset to charge only the two starter batteries. The two batteries are side by side, so on cold mornings (Shh! We don't admit to those in Florida) a single jumper cable joins the positives for parallel use.

https://www.amazon.com/Tekonsha-2024...448103&sr=8-14
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 14-04-2021, 18:51   #4
Registered User

Join Date: Jun 2013
Location: canada
Posts: 3,546
Re: DC-DC charger recommendation

Victron Orion smart. Come in different amp sizes.
A trickle charger is not enough as the engine battery is still running gauges, fuel pump etc I’d want something 15a+


An xantrax echo charger could also work but will undercharge the start battery since the hoyse battery vintage will be lower then what the start wants.
smac999 is offline   Reply With Quote
Old 14-04-2021, 19:14   #5
Registered User

Join Date: Jul 2014
Location: Seattle
Boat: Wauquiez Pretorien 35
Posts: 35
Re: DC-DC charger recommendation

Do you have an inverter? You can get a nice 5 amp Victron AC charger with bluetooth monitoring for under $100
patja is offline   Reply With Quote
Old 14-04-2021, 19:14   #6
Registered User

Join Date: May 2008
Location: Pender Harbour, BC
Boat: Stevens 47
Posts: 112
Re: DC-DC charger recommendation

I use one of these https://www.renogy.com/12v-dc-to-dc-...ttery-charger/
s/v Thea is offline   Reply With Quote
Old 19-04-2021, 12:21   #7
Sponsoring Vendor

Community Sponsor

Join Date: Sep 2020
Posts: 22
Images: 3
Re: DC-DC charger recommendation

Have you looked into an ACR (Automatic Charging Relay) which in summary would charge battery 1 until "full" and then overflow to charge battery 2 (by connecting them in parallel). Blue Sea has them and Victron has a Cyrix-Li-ct that works with a LiPO4 house bank and lead acid start battery.
__________________
Let us help you go solar with SunPower and enjoy clean & quiet, renewable power aboard your boat www.sunpoweredyachts.com
SunPoweredYachts is offline   Reply With Quote
Old 20-04-2021, 06:58   #8
Registered User

Community Sponsor

Join Date: Nov 2019
Location: South Carolina
Boat: Philip Rhodes Custom 71'
Posts: 127
Re: DC-DC charger recommendation

Quote:
Originally Posted by SunPoweredYachts View Post
Have you looked into an ACR (Automatic Charging Relay) which in summary would charge battery 1 until "full" and then overflow to charge battery 2 (by connecting them in parallel). Blue Sea has them and Victron has a Cyrix-Li-ct that works with a LiPO4 house bank and lead acid start battery.
An ACR between lead-acid and Lithium batteries has to be modified to account for the different voltages. Yandina has lithium versions of the Combiners available. 100amp, 200 amp, 600 amp.
__________________
Ann-Marie Foster
YANDINA is offline   Reply With Quote
Reply

Tags
charger, men

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
battery charger recommendation Buddy_Y Electrical: Batteries, Generators & Solar 8 03-02-2021 20:44
New charger recommendation? malyea General Sailing Forum 2 09-10-2017 16:53
Battery Charger recommendation... geoffr Electrical: Batteries, Generators & Solar 9 03-09-2017 08:31
Battery charger question and recommendation for Group 31 AGMs Refuse2growup Electrical: Batteries, Generators & Solar 3 24-09-2012 07:27
AC charger smarter than the 3 stage "smart" charger? CSY Man Electrical: Batteries, Generators & Solar 64 30-09-2006 12:49

Advertise Here


All times are GMT -7. The time now is 16:13.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.