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 10-02-2023, 14:03   #1
Registered User

Join Date: Nov 2009
Location: Montenegro
Boat: Jeanneau Sun Odyssey 45DS
Posts: 300
Images: 2
AGM as house Bank

Anyone using AGM as their primary house bank?

How was it?

Did you make any changes to your alternator set up?

Please no comments along the lines of "install Lithium instead"
duncan_ellison is offline   Reply With Quote
Old 10-02-2023, 15:04   #2
Registered User
 
NewMoon's Avatar

Join Date: Jan 2010
Location: Holladay, UT
Boat: Nordic Tug 37
Posts: 395
Images: 13
Re: AGM as house Bank

In two boats over the last 20+ years, I've used AGMs for both house and start banks. They work well if not often left in a partial state of charge. One set lasted 11 years.
__________________
Richard Cook
Dream Catcher (Nordic Tug 37) Poulsbo WA
"Cruising in a Big Way"
NewMoon is offline   Reply With Quote
Old 10-02-2023, 15:14   #3
Registered User

Join Date: Apr 2005
Location: Southern California
Boat: Catalina 320
Posts: 1,346
Re: AGM as house Bank

On a prior boat I had Trojan AGM's group 27 that lasted 10 years, and I have a pair of 4D AGM's now that I put in service 6 years ago. I've gotten about 6 years from Lead Acid batts and 10 or more from AGM's in my boats. They are in use year round and no freezing temperatures.
Calif.Ted is offline   Reply With Quote
Old 10-02-2023, 15:25   #4
Senior Cruiser
 
michaeld's Avatar

Cruisers Forum Supporter

Join Date: Sep 2010
Location: Pompano Beach, FL
Boat: Kaufman 47, Cutter
Posts: 366
Re: AGM as house Bank

Yes, we have four group 31 AGMs, totaling 400+ Ah. I installed a 130A Balmar alternator, ARS-5 regulator, and SG200 monitor. Solar consists of 350 Watts feeding an MPPT controller. I'm adding another 175 Watt panel. Shore charging is handled by a ProNautic 1250P. We burn about 100 Ah overnight (refrigeration, lights, chart plotter, AIS, etc.) Solar normally recharges the bank by early afternoon. Two cloudy days and the alternator has to be used. We rarely have shore power away from our home dock.
michaeld is offline   Reply With Quote
Old 10-02-2023, 16:44   #5
Registered User

Join Date: Nov 2018
Location: San Diego
Boat: Shannon 50 Ketch
Posts: 730
Re: AGM as house Bank

Quote:
Originally Posted by NewMoon View Post
In two boats over the last 20+ years, I've used AGMs for both house and start banks. They work well if not often left in a partial state of charge. One set lasted 11 years.
This is the key - as many here will tell you over and over - "if not often left in a partial state of charge". So if you are a weekend boater who keeps their boat at the dock plugged in 5 out of 7 days, or a marina live aboard, AGMs will be great.

But if you are actively cruising you will kill them quickly if you do not frequently (*debate about how frequent can now ensue*) charge them to 100% (ie. until they reach float). I was not able to meet that requirement and mine died in 18months.

I replaced them with Gel (which are not as sensitive to being left in a partial state of charge) and got 7 years out of them. (now I use LifePo4).
jordanbigel is offline   Reply With Quote
Old 10-02-2023, 17:16   #6
Registered User

Join Date: Jun 2019
Location: Rochester, NY
Boat: Chris Craft 381 Catalina
Posts: 6,560
Re: AGM as house Bank

Quote:
Originally Posted by jordanbigel View Post
This is the key - as many here will tell you over and over - "if not often left in a partial state of charge". So if you are a weekend boater who keeps their boat at the dock plugged in 5 out of 7 days, or a marina live aboard, AGMs will be great.

But if you are actively cruising you will kill them quickly if you do not frequently (*debate about how frequent can now ensue*) charge them to 100% (ie. until they reach float). I was not able to meet that requirement and mine died in 18months.

I replaced them with Gel (which are not as sensitive to being left in a partial state of charge) and got 7 years out of them. (now I use LifePo4).
That's a good point. AGMs aren't terribly tolerant of being charged less than fully on a regular basis. But given enough solar to get them full most days, they can work fine.

We've done fine with not abusing our AGMs. Solar gets them full daily unless it's too cloudy. One day of not getting topped off doesn't worry me, but if it's more than 1 day we'll either be underway (powerboat) and get some charging from the alternators to help the solar get things topped off or I'll run the generator for a bit to help out the solar.
rslifkin is offline   Reply With Quote
Old 10-02-2023, 18:09   #7
Registered User
 
fxykty's Avatar

Join Date: Apr 2016
Location: Indonesia
Boat: Outremer 55L
Posts: 3,936
Re: AGM as house Bank

Our boat came with 6x 110Ah Victron Energy AGM batteries installed in 2014 by the previous owner and we finally removed them in 2020. In the three years we had the boat prior to 2020 they rarely made it to 100% as we did not have shore power at our berth - just solar, wind, a diesel generator, and very poor engine alternators with internal regulators.

So they were mostly at PSOC, down usually no further than 60% and generally below 95-97%. Occasionally we’d visit a marina with shore power or when we were hauled out and I assume they got to 100% then. Also one very windy passage.

When we removed then they tested at 105Ah each and we sold them for $2K. So, from our experience, quality AGMs can certainly handle PSOC and don’t degrade quickly. YMMV
fxykty is offline   Reply With Quote
Old 10-02-2023, 18:49   #8
Registered User
 
Simi 60's Avatar

Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
Re: AGM as house Bank

Quote:
Originally Posted by duncan_ellison View Post
Anyone using AGM as their primary house bank?

How was it?

Did you make any changes to your alternator set up?
Had them, they served a purpose
Until they didn't
And technology changes

Quote:
Please no comments along the lines of "install Lithium instead"
Install Lithium instead
For us it was a cheaper and vastly superior result.

Even if AGM were free I wouldn't go back.
Simi 60 is offline   Reply With Quote
Old 10-02-2023, 20:45   #9
Registered User

Join Date: Jun 2013
Location: canada
Posts: 4,705
Re: AGM as house Bank

Agms are great. But they do need to be fully charged often.

Flooded batteries are gross, I would never use them.
smac999 is offline   Reply With Quote
Old 11-02-2023, 03:28   #10
Registered User
 
Jamme's Avatar

Join Date: Feb 2020
Location: Stamford, CT
Boat: Beneteau Oceanis 31
Posts: 724
Re: AGM as house Bank

Quote:
Originally Posted by duncan_ellison View Post
Anyone using AGM as their primary house bank?



How was it?



Did you make any changes to your alternator set up?



Please no comments along the lines of "install Lithium instead"


In my view, it all depends on intended use and recharging capabilities. I am a mostly weekend sailor, and because I have no solar or genset, my AGMs were done in a couple of seasons — the issue being that I was out for a couple of 2-week trips and AGMs did not appreciate the extended partial charge I gave them from my standard alternator.

So, back to old flood for me. As said, your experience may vary.

Fair winds.
__________________
"I always arrive late at the office, but I make up for it by leaving early.” – Charles Lamb
Jamme is offline   Reply With Quote
Old 11-02-2023, 10:01   #11
Registered User

Join Date: May 2016
Posts: 108
Re: AGM as house Bank

I have an 880 Ahr Lifeline AGM house bank made up of 8 6v batteries installed in 2010. The boat is used from April to October each year and rarely sees shore power. My daily usage averages 250 Ahr which represents about 1/3 of the current capacity. I have 1500 w of solar and regularly cycle from around 70% at daybreak to 100% by end of day with fairly significant usage during the day. Engine charging is not a significant contributor as we spend days at anchor at a time with a typical run of less than three hours to our next anchorage.

While my bank is slowly getting to end of life, I will continue using them hopefully for a few more years. At that time, lithium will be the cost effective replacement. Right now, a new set of Lifelines would be $3200 and I could easily get a quality 400 Ahr lithium setup for that. I have an alternator externally regulated and two chargers capable of lithium profiles so expenses beyond batteries should be minor. I will continue to keep my AGM batteries for my thrusters, davits and starter.
Senojev is offline   Reply With Quote
Old 11-02-2023, 13:47   #12
Registered User
 
GILow's Avatar

Join Date: Sep 2008
Location: On the boat, somewhere in Australia.
Boat: Swanson 42 & Kelly Peterson 44
Posts: 9,325
Re: AGM as house Bank

I had one try of AGMs. They were pretty cheap and nasty and were kaput in just two years.

I don't doubt good quality AGMs would have done better. Not sure how much better though.

But, if I understand things correctly, the main advantage of AGMs is their ability to handle higher charge and discharge rates, while the disadvantage is that they need to be kept at 100% very regularly.

Since lithium has the high current advantages of AGM without the PSOC problem I really wonder why anyone would go AGM over lithium these days. (And then there's weight too)
__________________
Refitting… again.
GILow is offline   Reply With Quote
Old 11-02-2023, 14:01   #13
Moderator

Join Date: May 2014
Boat: Shuttleworth Advantage
Posts: 2,429
Images: 3
Re: AGM as house Bank

Quote:
Originally Posted by GILow View Post
I had one try of AGMs. They were pretty cheap and nasty and were kaput in just two years.

I don't doubt good quality AGMs would have done better. Not sure how much better though.

But, if I understand things correctly, the main advantage of AGMs is their ability to handle higher charge and discharge rates, while the disadvantage is that they need to be kept at 100% very regularly.

Since lithium has the high current advantages of AGM without the PSOC problem I really wonder why anyone would go AGM over lithium these days. (And then there's weight too)

Agreed but lithium are not without their problems. Cannot be left at 100% SOC for long periods an issue with solar if you leave the boat unexpectedly. Nothing is perfect.
Tupaia is online now   Reply With Quote
Old 11-02-2023, 15:08   #14
Moderator
 
carstenb's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2012
Location: At sea somewhere in the Caribbean
Boat: Jeanneau Sun Fast 40.3
Posts: 6,461
Images: 1
Re: AGM as house Bank

We have 660AH AGM housebank. They are 4 years old Victron. We liveaboard 24/7 and they generally are charged by our solar (710watts). Since we live aboard we use somewhere around 200AH per 24hours

So far so good. Ours charge to full every day there is some sun - if we have cloudy days or when we were in alaska, we run the engine
__________________


https://www.amazon.co.uk/s?k=carsten...ref=nb_sb_noss

Our books have gotten 5 star reviews on Amazon. Several readers have written "I never thought I would go on a circumnavigation, but when I read these books, I was right there in the cockpit with Vinni and Carsten"
carstenb is offline   Reply With Quote
Old 11-02-2023, 16:11   #15
Registered User

Join Date: May 2008
Posts: 3,636
Re: AGM as house Bank

Another person who got tired of the PSOC problems with AGM house batteries. Had three sets on two different boats die in two-three years.

As others say, if you are normally plugged into a dock they are great. Also great for start batteries that never go below 90% charge.

On the first boat I replaced with gels that were going strong when I sold the boat after seven years.

Now have Lithium and - as others say - wouldn’t take AGM for a house bank if they were free. If you absolutely refuse to do Lithium, do gel or high quality flooded like Trojan T-125’s. But lithiums are now the cheapest “per year” cruising boat battery.
CarlF is offline   Reply With Quote
Reply

Tags
agm

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
Firefly AGM start battery and Battleborn house bank docrn Electrical: Batteries, Generators & Solar 17 19-12-2020 15:33
Gel vs AGM batteries for house bank jugga Electrical: Batteries, Generators & Solar 26 25-07-2017 15:20
New charger for a new AGM house bank Toubab Electrical: Batteries, Generators & Solar 1 26-04-2014 13:12
Assessing AGM house bank capacity rreeves Electrical: Batteries, Generators & Solar 0 18-07-2012 11:36
Gel or AGM for the House Bank on a Round-the-World Cruiser ? Ocean Roads Electrical: Batteries, Generators & Solar 12 05-05-2011 01:53

Advertise Here


All times are GMT -7. The time now is 01:29.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.