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 09-05-2019, 08:09   #31
Registered User
 
senormechanico's Avatar

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,879
Re: Do I need an alternator protection device when switching to Lithium?

Quote:
Originally Posted by john61ct View Post
As a side note, I have yet to find an LFP mode I would use on a bank I care about.

The key attribute for a LFP charge source IMO is user-custom adjustable setpoints, not just a menu of "canned" predefined choices.



John, you remind me of a true story from the 1970's when as an electronics repair tech, I told a new customer his black and white portable TV was not worth fixing. He was a well dressed guy, and I offered him a deal on a new Zenith color portable. He said (and this is a direct quote I'll never forget),

"No thanks, I'm waiting for 3D color TV."


I assured him that even though the new set was a good one and he'd get many years of satisfaction of ownership from it, he'd almost certainly be ready for another TV by the time 3D came out. He was surprised by my comment, and purchased the new TV.


So, John, just jump in to the pool of LiFePo4 ownership. The water's fine.
__________________
One should try to "Die Young" as old as possible.
senormechanico is offline   Reply With Quote
Old 09-05-2019, 08:13   #32
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 8,487
Re: Do I need an alternator protection device when switching to Lithium?

Quote:
Originally Posted by Oceanride007 View Post
--Quote (Originally by Oceanride007)---
>>>>>>>>>>>

.........but thinking I may be able to *run a small charger thru a inverter* from LA, if I want more or the other way around.

>>>>>>>>>>>>>>>>>>>>>>>>
---End Quote---

>>>>>>>>>>>>>>>>>>>>>>>


And your issue is?

No issue, just thought that when I first read it because it was standalone with no explanation of using shorepower at the same time.


No issue, no problemo.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is online now   Reply With Quote
Old 20-08-2020, 07:12   #33
Registered User

Join Date: Sep 2015
Posts: 6
Re: Do I need an alternator protection device when switching to Lithium?

Quote:
Originally Posted by john61ct View Post
Simpler is better.



Just put a lead batt direct inline with alt output all the time, if that's Starter fine. What is "normal", a simple VSR closes the connection to House based on
Won't this overcharge the lead acid battery? Can you mix battery technologies on a common bus?
StowawayJoe is offline   Reply With Quote
Old 20-08-2020, 15:13   #34
Registered User
 
Oceanride007's Avatar

Join Date: Jun 2013
Location: Up Qld Coast, near Yeppoon.
Boat: Passport 41, Custom Perry in steel.
Posts: 508
Re: Do I need an alternator protection device when switching to Lithium?

A factory installed Alternator would be OK for charging a LA battery any size, but you can't have it connected to in common with LFP.



On charge the LFP will take more from the alternator and at slow revs alternator won't have adequate air flow to prevent the alternator from burning out. (Unless you go to clever Regulator).


On Discharge the LFP battery will be a higher voltage than the at rest LA battery and because the LA battery has losses, you will drain House battery thru the start battery.


Not sure a one way VSR is designed adequately, would want it to close the circuit at >13.2v sensed from LA battery, but stops current from going other way, needs charge limiting as well. Don't know if one is available. John61ct not been around for a while.
__________________
Oceanrider.
"The floggings will continue until morale improves"
Oceanride007 is offline   Reply With Quote
Old 22-08-2020, 07:27   #35
Registered User
 
CatNewBee's Avatar

Join Date: Aug 2017
Boat: Lagoon 400S2
Posts: 3,019
Images: 3
Re: Do I need an alternator protection device when switching to Lithium?

You don't need one. Stock alternators just doing fine with LFP, I have 2x 80A Hitachi stock alternators with internal regulation on my 2 Yanmar 40Hp Engines, they are doing fine with the battery isolator FET splitter to charge the start batteries and yeld about 40A each to the 1000Ah massive LFP house battery without getting damaged now for the 3rd year.

But if you have spare money and dont trust the bank, you can buy fancy devices and add them to your alternator in the engine compartment.

There are many different ways to configure your charge system depending on your use profile. Just be consistent.
__________________
Lagoon 400S2 refit for cruising: LiFeYPO4, solar and electric galley...
CatNewBee is online now   Reply With Quote
Reply

Tags
alternator, rot

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
External alternator regulator for Lithium banks ? Jd1 Electrical: Batteries, Generators & Solar 29 12-08-2020 15:17
Earth Leakage Protection/ Residual Current Device. coopec43 Electrical: Batteries, Generators & Solar 16 08-12-2018 02:07
Protect alternator in Lithium/FLA system Newcruiser311 Lithium Power Systems 44 07-10-2018 21:06
Lithium Ion Breakthrough - forgetful-scientists-accidentally-quadruple-lithium-ion-ba zboss Electrical: Batteries, Generators & Solar 8 22-08-2015 23:35
Does Alternator Need Protection from AGMs? batkins61 Electrical: Batteries, Generators & Solar 14 24-05-2012 07:45

Advertise Here


All times are GMT -7. The time now is 17:02.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.