Reply
 
Thread Tools Display Modes
 
Old 08-16-2017, 05:52 PM   #1
Veteran Member
 
City: Mount Pleasant
Country: United States
Vessel Name: Endeavour
Vessel Model: '87 Island Gypsy
Join Date: Nov 2016
Posts: 37
my battery charger

I have an older NEWMAR HDM 50 3-bank battery charger...

I've been doing some "research" and I'm worried that leaving it on 24/7 isn't great for my batteries. When the batteries are full, I believe it constantly provides a small voltage to the batteries to keep them topped off.
It seems newer chargers are able to periodically check levels with a short charge--instead of constant.

Is my thinking close?

I have 3 DEKA 8D batteries (not AGM)

__________________
Advertisement

lowcountry is offline   Reply With Quote
Old 08-16-2017, 05:58 PM   #2
Senior Member
 
City: CT
Country: US
Join Date: Mar 2017
Posts: 403
Constant float is fine for lead, as long as voltage within mfg specs
__________________

john61ct is online now   Reply With Quote
Old 08-16-2017, 06:44 PM   #3
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,254
lowcountry, my IG has an even older Newmar, I`d bet both are original. I call mine the Jurrasic Mk1 prototype model. Both are old tech ferro resonant. The way I use my boat I`ve not bothered to update, esp. as I have a modest solar array. The charger is not connected when I leave the boat, solar keeps the batts full.
One thing I wondered,I hope john61ct will know this, is the 10amp output your charger shows total output, or 10A per bank? I`m guessing total.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 08-16-2017, 06:48 PM   #4
Guru
 
koliver's Avatar
 
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 2,090
I have that exact charger in my garage. I use it occasionally on cars, lawnmowers, etc.
It is the old "ferroresonant" type, and has only the same charging characteristics as a car alternator, unlike the modern 3 stage "smart" chargers.
However, that doesn't condemn it. Mine worked just fine for many years. I replaced it with a Xantrex Inverter/Charger in 2000, after 20 yrs of faithful service and no issues being connected to my batteries all of the time the boat was plugged into shore power.
I had a pair of 8D and another pair of 4D and a single 4D connected to its 3 output lines. None of those batteries suffered shortened life, I got 7 yrs lifetime out of all of them.
With the Xantrex operating on a "Smart" propocol, I have had 10 and 12 yrs from my batteries, but that is not the only change so I can't say the old charger wouldn't have done that well in the rest of my newer regime.
YMMV
__________________
Keith
koliver is offline   Reply With Quote
Old 08-16-2017, 06:50 PM   #5
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 3,520
NewMar has good customer service, even on old stuff (at least they did on the 30 year old items on my boat)contact them with any questions. https://dcpoweronboard.com/contact-us/
__________________
George

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
caltexflanc is offline   Reply With Quote
Old 08-16-2017, 07:08 PM   #6
Guru
 
ancora's Avatar
 
Join Date: Dec 2007
Posts: 3,464
My boat has a Newmar 45 amp (in your dreams) two bank charger that is over 30 years old. Why do I keep it? It works!
ancora is offline   Reply With Quote
Old 08-16-2017, 07:40 PM   #7
Guru
 
Lou_tribal's Avatar
 
City: Quebec
Country: Canada
Vessel Name: Bleuvet
Vessel Model: Custom Built
Join Date: Jan 2016
Posts: 1,716
I have a similar model but 20 (or 25 do not remember) amp max, it is working perfectly. Old but charging the batteries as expected. All mine are lead acid and for the last 2 years I have no issue with it. When batteries are fully charged it acts as a trickle charger.

L.
Lou_tribal is online now   Reply With Quote
Old 08-16-2017, 09:03 PM   #8
Senior Member
 
Ka_sea_ta's Avatar
 
City: Puget Sound
Country: USA
Vessel Name: Ka_sea_ta
Vessel Model: 48 Defever
Join Date: Jun 2016
Posts: 258
we have a similar battery charger, as a smart charger in the inverter. The ferroresonat charger is powered through a mechanical timer so it just runs 15 minutes a day. no cooked batteries.
Ka_sea_ta is offline   Reply With Quote
Old 08-17-2017, 03:23 PM   #9
Veteran Member
 
City: Mount Pleasant
Country: United States
Vessel Name: Endeavour
Vessel Model: '87 Island Gypsy
Join Date: Nov 2016
Posts: 37
Thanks for the reassurance! I'm just going to leave it on and not worry.
lowcountry is offline   Reply With Quote
Old 08-17-2017, 05:01 PM   #10
Veteran Member
 
City: Pompano Beach, FL
Country: USA
Join Date: May 2017
Posts: 25
If it is a ferroresonant charger do not leave it on all the time.

I have an older promariner ferroresonant charger that killed two batteries when left on for a couple of months. Boiled them dry and cracked a battery case.
Mkeller is offline   Reply With Quote
Old 08-17-2017, 05:45 PM   #11
Senior Member
 
City: CT
Country: US
Join Date: Mar 2017
Posts: 403
Easy enough to keep tabs on output voltage and amps for any charge source, never just take their word for things.

Even (especially) new out of the box they usually need adjustment to do the right thing as per bank's mfg specs.

Long as float voltage is properly low and the bank is sound should be no problem leaving it on 24x7.
john61ct is online now   Reply With Quote
Old 08-17-2017, 06:08 PM   #12
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,254
It`s a comparison between the reliable old style ferro resonant and modern multistage chargers which may be less reliable or long lived, but more likely to get the batts full and hold them there without overcharge.
If I didn`t have some solar I`d update the old Newmar, though when I suggested updating to a shipwright, he said reliability might outweigh new developments(not in those words!). We see posts on TF about problems with modern chargers, but I think they have charging efficiency ferro chargers don`t.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 08-18-2017, 05:58 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,202
"We see posts on TF about problems with modern chargers, but I think they have charging efficiency ferro chargers don`t."

One hassle with "modern" chargers comes from DC system use dockside.

Should say the DC fridge be on ,and the FW pump switch on the batt voltage can drop to the point where the charger will begin a charge cycle.

This will pump 14+ volts into the house untill the thing thinks the batt is back to 100% full and switches to float.

This causes a requirement for more frequent batt watering .
__________________

FF is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 03:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012