Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-08-2014, 09:40   #16
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Agm eastpenn (2) with 14w solar

Thanks for the excellent How to Articles. In addition to the Morningstar write up, I've read all the seacock articles, as I have to fix our Wilcox Crittendon with more lapping (can you do too much? - I now need an extra washer.) because they still leak. Perhaps I should get one or two new Spartan seacocks? I am certainly going to get Spartan grease as that has been one of my huge issues, none of it is heavy enough, finally used Lanacote last year, regreasing in the water, with plugs, but I finally stopped the drips!
__________________

__________________
rgleason is online now   Reply With Quote
Old 02-05-2015, 11:44   #17
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Agm eastpenn (2) with 14w solar

This winter I maintained the same batteries with a Guest 3-step 10amp charger.
I found the resting voltage is 12.65 amps for both. This is after the batteries had been charged and then sit for a couple of weeks.

There does not seem to be much discharge at all because after 2 months, I put the charger back on and it immediately showed a green light only. So it appears this is a little low for AGM voltage, but they are Aug 2008 batteries.

Trojan lists this for their AGM's
AGM Rating Charge
100% 13.2 - 12.8 v
75% - 12.4 v
50% - 12.2 v
25% - 12.0 v

So ours are somewhere around 87% of the listed AH.
The CCA for both is right on what they are listed for.

If I do need to get new batteries later.
I have found our battery case will hold (2) Trojan 6V T105 GC2 in series (10.3"L x 7.06"W x 10.73" H)
This type comes in Flooded Lead (224ah) $170 each and AGM (217ah) or Gel for about $260.

We motor twice a day usually and can charge then for 1/2 hour to 1 hour. We have a small danfoss refrige (7ah x 5 hr/ 24hr) and are hoping to get a chartplotter, we have an old radar. Our house battery bank is currently only 160 ah, and we have gotten by so far, but need more ah.
We have a derated 75amp Balmar (now 65amp) for fast charge at low rpm, with a Balmar Regulator.

This question is loaded, but which type of battery will charge faster, and how much faster (is it significant amount of time that would be idling our engine?) and which battery would provide the best service life and is most appropriate for our use.

We try to keep the battery charge so it never drops below 60%-70%, but occassionally it gets down to 50%.

I am putting a 7amp Solar PV controller on the 14watt Solar PV because I saw voltages of 20 volts after returning to the boat after two weeks. The batteries were fully charged and being overcharged with a 1amp trickle from the Solar PV array. I don't think that is too good.
__________________

__________________
rgleason is online now   Reply With Quote
Reply

Tags
agm, solar

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solar or AGM battery problem SvenG Electrical: Batteries, Generators & Solar 23 24-03-2013 11:17
AGM and gel-cell performance notes Rick Electrical: Batteries, Generators & Solar 15 03-11-2006 20:12
AGM and gel-cell performance notes Rick Product or Service Reviews & Evaluations 1 28-10-2006 16:09
Lifeline AGM Opinions Holding Pattern Electrical: Batteries, Generators & Solar 17 20-09-2006 15:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:31.


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.