Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-07-2015, 15:35   #76
Marine Service Provider
 
Maine Sail's Avatar

Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,060
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by phantomracer View Post
Just a followup to this thread (I know everyone has been waiting!!!!)

went to the boat yesteday, to check the battery.. Boat hasnt run since sunday, so this is all efoy charging.

The fridge was at about 40 degrees (have it set for 39), so I know it has not run in a bit, and the efoy was not running (in standby).

Boat was 80degrees F. Battery was 12.9v at the terminals (and at the efoy display)
Checked the SG with a Easyred hydrometer (checked each twice for redundancy)..here are the results:

Batt1 (6v), starting at the cell closest to +
1 - 1265
2 - 1265
3 - 1265
Batt2 (6v), starting at the cell closest to +
4 - 1275 - 1300 (between the 2 marks)
5 - 1275 - 1300 (between the 2 marks)
6 - 1275

Not sure if this is good, bad, indifferent.
Other than your series batteries being slightly out of SOC balance the SG readings look good, or about as good as an EZ Red can do. An EQ should bring them to parity....
__________________

__________________
Marine How To Articles
Maine Sail is offline   Reply With Quote
Old 29-07-2015, 22:00   #77
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 773
Images: 9
Send a message via Yahoo to phantomracer
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by svlamorocha View Post
Those SG values are good, assuming that the batteries are fully topped up (I refer to the level of electrolite). Is that the case?
It was what the batteries were when I got to the boat. The fridge was a degree higher than set..so it hasnt run for a while..nor did the fuel cell.. (unsure how long, but a while..couple hours or more maybe), so there was some rest after the efoy shut off.
__________________

__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer is offline   Reply With Quote
Old 29-07-2015, 22:06   #78
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 773
Images: 9
Send a message via Yahoo to phantomracer
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by Maine Sail View Post
Other than your series batteries being slightly out of SOC balance the SG readings look good, or about as good as an EZ Red can do. An EQ should bring them to parity....
sounds good.. I checked each twice..reading was the same..so at least the ez red is at least consistent. I wasn't sure if the spread of values was good.. or real bad..so thats good that they are decent.

it looks like the efoy is doing a decent job of bringing the batteries to a good (as can be ) charge (at least with the information I am presenting, the best I can not being a professional)

I'll try and do an equalization soon as possible.

This has been a good exercise.. I have learned a lot. Thanks everyone for your help. This has been invaluable!
__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer is offline   Reply With Quote
Old 30-07-2015, 04:45   #79
Registered User

Join Date: Jun 2009
Location: still in a roll of fiberglass around Cape Town
Boat: Leopard 40 (new model)
Posts: 1,201
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by phantomracer View Post
It was what the batteries were when I got to the boat. The fridge was a degree higher than set..so it hasnt run for a while..nor did the fuel cell.. (unsure how long, but a while..couple hours or more maybe), so there was some rest after the efoy shut off.
You and I are talking about different things. I was saying (in other words) that in order for the SG readings to be useful, the level of the liquid inside the battery has to be at at maximum.

Sent from my GT-I9192 using Cruisers Sailing Forum mobile app
__________________
svlamorocha is offline   Reply With Quote
Old 30-07-2015, 06:51   #80
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 773
Images: 9
Send a message via Yahoo to phantomracer
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by svlamorocha View Post
You and I are talking about different things. I was saying (in other words) that in order for the SG readings to be useful, the level of the liquid inside the battery has to be at at maximum.
ah you meant the water, i thought you meant charged... sorry about that!

the water is well above the plates and 1/4" below the bottom of the fill hole (per Rolls instructions). I check the battery water level regularly. That, I am obsessed about. Before the efoy, some reason I needed to add a lot more water more frequently. I add less now, and less frequently. But it is checked at least every 2 weeks or so.

kinda funny.. was searching about batteries..stumbled upon this - EZ Red - B108 Refractometer "Does not function as a lightsaber" Good to know!
__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer is offline   Reply With Quote
Old 26-08-2015, 12:48   #81
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 773
Images: 9
Send a message via Yahoo to phantomracer
Re: Best practice for desulfation battery bank

Quote:
Originally Posted by Maine Sail View Post
Supplementing with solar would certainly be a help but with a small array the batteries will need a break from "loads" about once every two weeks to allow a FULL CHARGE for a few days. On a boat everything is a compromise.

From your described use Firefly Carbon Foam AGM's would probably suit you better as they can go much longer periods between full charges and still reconvert the lead sulfate.
Looking at the Firefly for the next time I replace the batteries. Looks like it could be a good fit for my needs and harder for me to kill..although I am sure I am up for a challenge!

Any suggestion on which, and how many to install? 3x4v, or 1 (or 2 in parallel) 12v? Unsure if/when they will come out with 6v

I assume I would charge them on the 'agm' setting on my charger? Will have to change the setting on the balmar 614 as well

I would need new battery ends as I am using the thick stud terminals (to the loads) and screw terminals(to duo charge)

As of now I shut the refrigerator off when not in use..the insulation is so poor (1968 technology). adding insulation is on the list to upgrade..Gone through too many methanol canisters this season already trying to keep everything alive

But excited about the firefly batteries. Hope they can take my abuse!
__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer is offline   Reply With Quote
Old 30-01-2016, 12:58   #82
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 773
Images: 9
Send a message via Yahoo to phantomracer
Re: Best practice for desulfation battery bank

bringing this thread back to life

wondering if my batteries (2 x 6v Rolls 262 ) are FUBAR or can be salvaged.

brought the batteries home to equalize. took 5 hours using the west marine 30 amp smart charger's equalization mode. I let it rest 12 hours and checked the SG (below) using the Easy Red tester

here is the charger (its what I happen to have)
http://newcontent.westmarine.com/con...%206885776.pdf

batt1 +
1225
1225
1225
------- batt 2 +
1265
1265
1250

(FWIW, the batteries are hooked up opposite to the way they were in post #74)

Can they be salvaged?

I would like to get another season out of them before going with the firefly batteries the next season
__________________

__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer 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 03:25.


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.