[PSUBS-MAILIST] agm charger

Mon May 18 20:37:48 EDT 2015

Thanks' guys,
I will buy another charger, just would have been convenient to use what I have.  No point risking expensive batteries.  
Scott, that is the identical charger I have been using.  Maybe I had a dud.
Hank--------------------------------------------
On Mon, 5/18/15, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] agm charger
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Monday, May 18, 2015, 8:19 PM

 Hank, the
 only thing that I would be worried about is that car
 alternators are designed to recharge conventional lead acid
 car batteries.  Deep cycle AGM's are a different
 beast.  AGM are more susceptible to being damaged by
 overcharging.  Also most sophisticated battery chargers go
 through three distinct phases depending on the initial
 SOC.  With a car alternator, you are not going to get this
 this unless you go through a PLC and program in the charging
 curves.

 I have had
 good luck over the last 8 years with on onboard battery
 charger for AGMs that is used for electric car/truck
 conversions.  When my boat's main propulsion bank was
 120 VDC I used a Zivan NG3 120-18 and now that I have
 switched to 36 VDC bank, I use a Zivan NG3 http://www.zivanusa.com/pdf/NG3.pdf. 
 I have had hundreds of recharges using these rechargers with
 no problems.    You can get a panel mounted  remote
 display that shows were you are on the recharge.  The
 suppliers adjust these to match type and capacity of your
 AGM batteries.  They are a bit pricey but often come up
 eBay. I really like being able to plug my boat into an AC
 receptacle and come back the next day with them fully
 charged having gone through a charging curve that is tuned
 to my AGM batteries.  For winter storage, you can leave the
 boat plugged in indefinitely and the system supplies a float
 charge again tuned to your AGM batteries.  The only
 negative on this system is that a battery bank is typical
 made of individual batteries wired in parallel and series. 
 This system does not have a Battery Management System (BMS)
 like you would have on a lithium-ion battery that
 controls charge on individual batteries, just he overall
 bank.  I have had to replace individual batteries that
 degraded over time.  
 Cliff 

    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>

 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 
  Sent: Monday, May 18,
 2015 6:11 PM
  Subject: Re:
 [PSUBS-MAILIST] agm charger

 Scott,
 I have
 been using the same thing and they don't last, we pay 85
 dollars here.
 I added a couple pictures that
 show the ballast tanks nicely, I am sure happy with it.
 Hank
 --------------------------------------------
 On Mon, 5/18/15, swaters at waters-ks.com
 via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] agm charger
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Monday, May 18, 2015, 7:05 PM

  Hank,I

 charge my AGM's with a computerized battery charger.
  They cost about $65.00 at True Value Hardware.
 They charge
  at the correct rate and shut
 off when the charging is

 complete.Thanks,Scott
  Waters

  Sent
  from
 my U.S. Cellular® Smartphone

  -------- Original message --------
  From: hank pronk via Personal_Submersibles
  <personal_submersibles at psubs.org>

  Date:05/18/2015  5:58 PM  (GMT-06:00)

  To: personal_submersibles at psubs.org

  Cc:  
  Subject:
 [PSUBS-MAILIST] agm charger 

  Hi all,
  I am tired of buying
 battery chargers for Gamma.  I
  think I am
 over using them and they go haywire.  I read
  that I can charge my AGM's with an
 automotive
  alternator.  I am thinking of
 building a battery
  charger with an
 alternator driven with  a 1hp AC 220 V

 motor.  The alternator has an internal regulator, so it
  will stop charging when the battery is full. 

  Is there anything wrong with this idea?
  Hank

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