Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-20-2019, 11:44 AM   #1
Newbie
 
City: Colchester, Vermont
Country: USA
Join Date: Nov 2018
Posts: 2
Winter solar charging of batteries

Solar panels for onboard battery winter storage I have four size 74 liquid cell batteries that are connected in series on my Mainship 30 and would like to attach a solar panel and controller to preserve the batteries with a trickle through the long winter storage season. Obviously a novice, I would like to know if I use a single solar panel (what size?) and a single controller (what size). Do I then just clip one cable to the positive post of battery #1 and the second cable to the negative post on battery #4?
__________________
Advertisement

Mheitner is offline   Reply With Quote
Old 07-20-2019, 12:10 PM   #2
Guru
 
djmarchand's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,693
Go to the Library/Systems link found in the upper right corner of this page and read the article Solar Panels for Your Boat.

A 100 watt panel will work for you even in the winter, connected to a 10 amp or larger controller. The new Victron MPPT controller is a good choice. See https://www.amazon.com/Victron-BlueS...s%2C309&sr=8-4

Connect the controller's output to the + and - terminals of your battery, but put a 10A fuse in the + wire near the battery to protect it.

David
__________________

djmarchand is online now   Reply With Quote
Old 07-22-2019, 10:01 AM   #3
TF Site Team
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 1,708
You could upgrade to AGM batteries and simply turn the battery switch off for the winter. I turn my battery switch off and 6 months later, I turn it on and then turn on the lights and the stereo.

AGM loses a ridiculously small amount of amperage per month. No need to trickle charge them.
Shrew is offline   Reply With Quote
Old 07-22-2019, 10:15 AM   #4
CMS
Senior Member


 
City: Casco Bay
Country: USA
Join Date: Feb 2016
Posts: 213
Quote:
Originally Posted by Mheitner View Post
Solar panels for onboard battery winter storage I have four size 74 liquid cell batteries that are connected in series on my Mainship 30 and would like to attach a solar panel and controller to preserve the batteries with a trickle through the long winter storage season. Obviously a novice, I would like to know if I use a single solar panel (what size?) and a single controller (what size). Do I then just clip one cable to the positive post of battery #1 and the second cable to the negative post on battery #4?
In VT...

#1 Charge to 100% SOC in the late fall / EQ if possible
#2 Physically disconnect all batteries from the vessel
#3 Disconnect each battery from any other batteries
#4 Come back in the spring and reverse the process

We've seen far too many banks ruined by unattended charging including batteries left with solar charging. In cold weather the self discharge rate is almost nil.

Winter Battery Storage & Self Discharge Characteristics











.
__________________
-CMS

MarineHowTo.com
CMS is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 09:41 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012