Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 20-08-2020, 15:04   #1
Registered User

Join Date: Jul 2014
Location: NorCal
Boat: Westsail 42
Posts: 101
LFP for boats staying mostly in the slip

I recently upgraded my house bank to LFP with the intention of retiring and doing some cruising. Because of the pandemic I've changed plans and will continue to work until next year. So for the next year the boat will be used on the weekends and remain in slip the rest of the week on shore power. Typical daysailer schedule. My question is concerning the batteries being left on shore power and fully charged most of the time. In the slip the draw should be low so was wondering if there was any benefit to leaving it off shore power periodically (one week on, one week off for instance) just to let the batteries discharge a bit. Or just let them stay fully charged most of the time and don't worry about.


Thanx
jimp1234 is offline   Reply With Quote
Old 20-08-2020, 15:58   #2
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 4,261
Re: LFP for boats staying mostly in the slip

LFP batteries are happiest at about 50% charge and shouldn't be held at more than 90% continuously for long periods if maximum working life is to be achieved. You probably wont kill them if you keep them at full charge, but it wont do them any favours.



If you're daysailing, you can probably get away with partially charged batteries. If you have a suitable charging system, and the inclination to do so, the easiest way to keep the charge down is to re-program the maximum charge voltage. 13.2V is about the 50%-70% charge value.
Reefmagnet is online now   Reply With Quote
Old 23-08-2020, 14:05   #3
Registered User

Join Date: Oct 2013
Posts: 225
Re: LFP for boats staying mostly in the slip

I always try to have the batteries at 40-60% at the dock and never leave the shore power on. I then try to cycle them even if I have access to shore power. I mean the spec says they can do like 4000 cycles and I maybe spend 50 nights a year in the boat. If I where you I would not leave them on shore power all week
Flod is offline   Reply With Quote
Old 23-08-2020, 14:12   #4
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Caribbean live aboard
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 5,131
Images: 84
Re: LFP for boats staying mostly in the slip

Quote:
Originally Posted by Reefmagnet View Post
LFP batteries are happiest at about 50% charge and shouldn't be held at more than 90% continuously for long periods if maximum working life is to be achieved. You probably wont kill them if you keep them at full charge, but it wont do them any favours.



If you're daysailing, you can probably get away with partially charged batteries. If you have a suitable charging system, and the inclination to do so, the easiest way to keep the charge down is to re-program the maximum charge voltage. 13.2V is about the 50%-70% charge value.
All true BUT, make sure float is zero. Lithium batteries can be destroyed by float. It should not be part of any charging device.
Nicholson58 is offline   Reply With Quote
Reply

Tags
boat

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
Boats for sale: mostly beat, leaking, wasted UGH Tetepare General Sailing Forum 28 18-08-2018 12:19
Mostly sailing or mostly motoring to the Caribbean? Cthoops General Sailing Forum 42 17-11-2016 18:58
All-Electric Cooking (Mostly) bobfnbw Electrical: Batteries, Generators & Solar 3 04-06-2009 06:45
wedding gift list for a cruising newbie couple(mostly for her) phorvati Families, Kids and Pets Afloat 30 18-06-2008 12:58
Classic Yacht magazine (mostly poweboats) Gulfcoastbreeze Powered Boats 0 02-04-2007 15:04

Advertise Here


All times are GMT -7. The time now is 02:38.


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.