Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-09-2013, 07:18   #1
Registered User

Join Date: Sep 2013
Posts: 12
Battery Charging, Battery Return amps and Victron

Recently I have installed a small solar power system- consisting of 3 canadian solar 245w, a Outback FM 80 charge controller, 2 Rolls s-430 batteries and a Victron Battery monitor. I have noticed over the first three months after the install that my SOC has not been going below 90% each day. As I am in the tropics around Liberia, every day that 10% gets filled back up. This first three months of the system are in the rainy season and so in about a month I will have more sun that I know what to do with! I am a bit concerned about the long term with the SOC on the batteries. I think that It would be better to get the SOC to 80% before I started charging up again. I am manually shutting down the PV array every other day to bring the SOC down to about 85 or 80% at present. The other problem that I have noticed is that they are not getting a full absorption. I know this by the SG being a bit low at supposed full charge, SG read 1.255 at full. I do have a victron Batter Monitor installed I would like to charge them and adjust setting's based on battery return amps. I understand with the shunt from the victron you can see in and out amps used. Is there a way to charge, selectively adjust absorption charge time based on this number? Can the Victron unit be link to a charger to achieve this? If not how do you achieve this? Maybe a Victron MPPT-Anyone using a Victron MPPT, are they any good? Any suggestions? ITJ Current settings on the OB are AB 14.7 4 hours with no end amps setting Float 13.2
__________________
inthejungle is offline   Reply With Quote
Old 16-09-2013, 07:44   #2
Marine Service Provider
 
Maine Sail's Avatar

Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,060
Re: Battery Charging, Battery Return amps and Victron

Quote:
Originally Posted by inthejungle View Post
Recently I have installed a small solar power system- consisting of 3 canadian solar 245w, a Outback FM 80 charge controller, 2 Rolls s-430 batteries and a Victron Battery monitor. I have noticed over the first three months after the install that my SOC has not been going below 90% each day. As I am in the tropics around Liberia, every day that 10% gets filled back up. This first three months of the system are in the rainy season and so in about a month I will have more sun that I know what to do with! I am a bit concerned about the long term with the SOC on the batteries. I think that It would be better to get the SOC to 80% before I started charging up again. I am manually shutting down the PV array every other day to bring the SOC down to about 85 or 80% at present. The other problem that I have noticed is that they are not getting a full absorption. I know this by the SG being a bit low at supposed full charge, SG read 1.255 at full. I do have a victron Batter Monitor installed I would like to charge them and adjust setting's based on battery return amps. I understand with the shunt from the victron you can see in and out amps used. Is there a way to charge, selectively adjust absorption charge time based on this number? Can the Victron unit be link to a charger to achieve this? If not how do you achieve this? Maybe a Victron MPPT-Anyone using a Victron MPPT, are they any good? Any suggestions? ITJ Current settings on the OB are AB 14.7 4 hours with no end amps setting Float 13.2
When was the last time you did a manual re-set when "known full" on the Victron. Solar can wreak havoc on "false re-sets" so you may not actually be where you think you are. Remember these devices do not re-set on counting Ah's they reset on voltage, current and time at voltage/current. Solar can trick these into re-setting even if you are not full.
__________________
Marine How To Articles
Maine Sail is offline   Reply With Quote
Old 16-09-2013, 13:36   #3
Registered User

Join Date: Sep 2013
Posts: 12
Re: Battery Charging, Battery Return amps and Victron

I tested the SG's last week after turning up the absorb time and got to 1270 and synced the victron
__________________
inthejungle is offline   Reply With Quote
Reply

Tags
battery, charging

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 02:26.


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.