Cruisers Forum
 


Join CruisersForum Today

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 17-12-2018, 10:50   #1
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 12,209
Good Adjustible Stepped Charger 10-15a

I am looking for a good inexpensive adjustible stepped charger for deep cycle FLA, agm, gel, lfp etc. to replace my old simple Guest chargepro 10 for occassional automatic winter use to fully charge my batteries

OR should I just get a 60a sterling procharge and remove it from the boat each fall?
__________________

rgleason is online now   Reply With Quote
Old 17-12-2018, 10:58   #2
Moderator
 
Pete7's Avatar

Cruisers Forum Supporter

Join Date: Aug 2009
Location: Solent, England
Boat: Moody 31
Posts: 11,161
Images: 14
Re: Good Adjustible Stepped Charger 10-15a

I was going to suggest a small Sterling PRO charger until you said LFP, which probably rules out most of the current chargers. Give up the LFP requirement then fine, or the equivalent CTEK.



However, your comment about a 60A charger is also a concern, how big is this battery bank?

Will this charger be used as a power pack to run lots of 12v items whilst your plugged into shore power. Finally why do you think it needs to be taken home for the winter? my Sterling Digital is permanently wired in and stays on board all year round.
__________________

Pete7 is offline   Reply With Quote
Old 17-12-2018, 12:41   #3
Registered User

Join Date: Jan 2017
Posts: 9,561
Re: Good Adjustible Stepped Charger 10-15a

Could just use a Power Supply if you or the BMS are terminating charging, no stages required.

But you do need to set your own voltage for LFP.

Sterling ProCharge Ultra and ProMariner Pronautic P let you do that, not sure what their lower current ones are.

They also let you derate amps if you want to keep current low.
john61ct is online now   Reply With Quote
Old 17-12-2018, 15:20   #4
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 12,209
Re: Good Adjustible Stepped Charger 10-15a

Thanks, all. I just threw LFP in there for the future. If it is cheap enough and works properly, charging to 100%, it won't matter.

I mentioned Sterling pro 60a because it was considering house loads while charging LFP 200-300 ah bank fast, but I think 40a would fine.
rgleason is online now   Reply With Quote
Old 18-12-2018, 06:42   #5
Registered User

Join Date: Jan 2017
Posts: 9,561
Re: Good Adjustible Stepped Charger 10-15a

It is the lack of user customizable voltage setpoints that makes that model unsuitable.

Yes amps output is irrelevant for both FLA and LFP if you have all the time in the world to get the energy back in.

But running off a genny you want to limit runtimes, thus a charger capable of handling its max output, but also capable of being de-rated, is optimal.
john61ct is online now   Reply With Quote
Old 18-12-2018, 11:02   #6
Registered User

Join Date: Sep 2013
Location: Montreal
Boat: Dufour 39 Frers
Posts: 248
Re: Good Adjustible Stepped Charger 10-15a

Size the charger amps outputto be about 10% of the bank capacity. i.e. 30amps for 300 amps/h capacity.

10 amps for LFP is a non sense, considering the LFP will take all the currents they can out of the charger. the 10 amps charger will run full performance, increasing wear faster than you think.
Emouchet is offline   Reply With Quote
Old 18-12-2018, 12:07   #7
Registered User

Join Date: Jan 2017
Posts: 9,561
Re: Good Adjustible Stepped Charger 10-15a

Quote:
Originally Posted by Emouchet View Post
Size the charger amps outputto be about 10% of the bank capacity. i.e. 30amps for 300 amps/h capacity.
Bit higher is faster even for FLA. AGM needs lots more .2-.4C minimum.

> 10 amps for LFP is a non sense, considering the LFP will take all the currents they can out of the charger. the 10 amps charger will run full performance, increasing wear faster than you think.

Yes since OP said cheap, that is a concern that the mfg skimps on overcurrent protection.

But if not, the only downside is slower charge times.
john61ct is online now   Reply With Quote
Old 19-12-2018, 16:11   #8
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 12,209
Re: Good Adjustible Stepped Charger 10-15a

My 1999 Guest Charge Pro 2612A 10 amp Charger, on (2) Trojan 6vdc T105 (series) shuts off prematurely and only charges them up to 83% capacity. This resulted in a terrible PSOC problem and has resulted in the possible loss of at least one pair of T105 batteries.

I wrote Marinco about this and the response was:
Quote:
"I am sorry to say based on the age of the unit I can not do anything for warranty on it. My guess due to the age the Capasitors inside are drying up and not able to do the same output as they used to."

Does not spell capacitors correctly either... What is "drying up"? I think capacitors work or they don't. I think it is more about the voltage/current sense circuit.









rgleason is online now   Reply With Quote
Old 19-12-2018, 17:04   #9
Registered User

Join Date: Jan 2017
Posts: 9,561
Re: Good Adjustible Stepped Charger 10-15a

Have to say I'm surprised you're even trying, what 20 years later? Wasn't that great even when new.
__________________

john61ct is online now   Reply With Quote
Reply

Tags
charger

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
Keel stepped, deck stepped, tabernacle? Bluefuss Monohull Sailboats 16 18-01-2013 11:58
Simple 15A Shore Power In Small Boat (Looking to install in-line 15A AC Breaker ) NS22Wren Electrical: Batteries, Generators & Solar 1 31-10-2012 05:51
Keel-stepped or Deck-stepped Mast? heronspeak Deck hardware: Rigging, Sails & Hoisting 15 08-09-2012 22:04
Keel-Stepped vs Deck-Stepped . . . jdeatsch Deck hardware: Rigging, Sails & Hoisting 54 19-11-2010 16:20
Converting Keel-Stepped to Deck-Stepped Mast Ben M-P Monohull Sailboats 8 19-11-2010 06:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:20.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.