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 30-06-2019, 01:18   #1
Registered User

Join Date: Nov 2014
Location: Germany
Boat: Beneteau Sense 43
Posts: 137
LiFePO4 cell level monitoring devices

I would like to add cell based monitoring to our LiFePO4 banks (one main bank, two portable ones) and I am looking for options. My research has not yet turned up anything useful, so I decided to ask the crowd if anybody has a recommendation.

Connection does not have to be permanent, I plan to use it only for monitoring discharge tests and rebalancing monitoring, but preferably I would like to have "remote access", such as via Bluetooth and an iOS App.
An alternative would be data logging capability on the device.
The device should have decent accuracy (1 mV would be nice) for a minimum of 4S, low power consumption, preferably evenly distributed on the connected cells, from the pack voltage or via a separate power connection.

In the main LFP thread some posters mentioned using the Junsi CellLog 8S for monitoring their LFP bank.
This device seems to be out of production and is seemingly no longer available for order in Europe. In addition, I seem to remember from the discussion that it had the disadvantage of unevenly loading the cells monitored, drawing its power from one of the cell connections. But I may remember this incorrectly.

Another interesting monitor I found while researching the topic is the Flytron iCell Battery Cell Monitor: https://flytron.com/icell/269-icell-...l-monitor.html
Very small, Bluetooth, but seemingly out of production (and the iOS App is no longer in the App Store).

Any other hints?
__________________

mbartosch is online now   Reply With Quote
Old 30-06-2019, 01:55   #2
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

First get "balancing ports" wired.

For remote monitoring I think a "bluetooth BMS" as is common in EV / eBikes will fit the bill, google that on Endless Sphere.

Otherwise the RC world has dozens of choices, any balancing charger for example.

Lots of "Battery Checkers" on the market since CellLog was dropped, G.T. Power and Turnigy 7in1 for example.

Browse HobbyKing for cellmaster.

ISDT BG-8S looks good.

Key bit is accuracy of course, make sure user calibration is featured,

if you don't have a calibrated DMM, one of these will help

https://www.amazon.com/Precision-Vol.../dp/B00Z033Y6Y


https://www.ebay.com/itm/LM399-4-Cha...e/263435494861
__________________

john61ct is offline   Reply With Quote
Old 30-06-2019, 05:54   #3
Registered User

Join Date: Nov 2014
Location: Germany
Boat: Beneteau Sense 43
Posts: 137
Re: LiFePO4 cell level monitoring devices

Good pointers, thank you very much. I must have been looking at the wrong places.
My precision DMM only shows one voltage which makes monitoring charge/discharge tests tedious. I will try out the ISDT BG-8S, I suppose.
mbartosch is online now   Reply With Quote
Old 30-06-2019, 07:52   #4
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

Many high quality RC chargers will actually automate the charge and CC load discharge cycle testing for you, and output the captured data to your PC for you to generate lots of pretty graphs.

For example iCharger DUO-4010 handles a regenerative discharge of up to 1400W from one channel into a resistance load on the other.

PowerLab 8v2 does similar.

Many use West Mountain CBA IV, but I don't prefer single-purpose gadgets unless they're cheap.

The $30 constant load gadgets are only 10A each, and can be paralleled to handle higher rates.
john61ct is offline   Reply With Quote
Old 30-06-2019, 08:31   #5
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

Banggood just this minute put the BG8 on sale.

https://m.banggood.com/ISDT-BattGo-B...p-1177825.html
john61ct is offline   Reply With Quote
Old 30-06-2019, 10:18   #6
kcj
Registered User

Join Date: May 2012
Boat: Lagoon 470, ex corsair f31
Posts: 134
Re: LiFePO4 cell level monitoring devices

I too am an orphaned celllog8 user. The one function I have not been able to find is the cell level user programmable “high voltage alarm”. Anyone have any luck ?

I love the simplicity and programmability of the celllog8...and at $20 per I can buy spares...unlike the the $150+ alternatives...and in two plus years there has not been much need for cell balancing...
kcj is online now   Reply With Quote
Old 30-06-2019, 11:32   #7
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

Quote:
Originally Posted by kcj View Post
The one function I have not been able to find is the cell level user programmable “high voltage alarm”
Just browse HobbyKing, many choices
john61ct is offline   Reply With Quote
Old 30-06-2019, 13:50   #8
kcj
Registered User

Join Date: May 2012
Boat: Lagoon 470, ex corsair f31
Posts: 134
Re: LiFePO4 cell level monitoring devices

I’ll try to call them...I was unsuccessful browsing...lots with low voltage alarms...and but no luck with regard to high voltage....thx
kcj is online now   Reply With Quote
Old 30-06-2019, 14:02   #9
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

Aha, yes HVC is usually a charger function.
john61ct is offline   Reply With Quote
Old 30-06-2019, 18:30   #10
Registered User

Join Date: Dec 2015
Posts: 451
Images: 1
Re: LiFePO4 cell level monitoring devices

Theres a new item on the market from the Aussies called" Kick Starter "maid for Lifepo4 batteries and has a big row for attaching and monitoring each cell and it might have bluetooth (might)
Rorzech is offline   Reply With Quote
Old 30-06-2019, 19:00   #11
Registered User

Join Date: Dec 2015
Posts: 451
Images: 1
Re: LiFePO4 cell level monitoring devices

That is the stupidest web store I have ever come across. They'll let you enter a credit card number and thats as far as you can go.You can spend as much time as you want trying to enter expiry date but no success. I guess its time to inform my credit card co.
Banggood bangs you real good.
Rorzech is offline   Reply With Quote
Old 30-06-2019, 20:54   #12
Registered User

Join Date: Jan 2017
Posts: 11,659
Re: LiFePO4 cell level monitoring devices

Pretty much everything Banggood sells is available on Ali if not eBay. Some even on Amazon.
__________________

john61ct is offline   Reply With Quote
Reply

Tags
lifepo4, monitor

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
Inexpensive Battery Monitoring Devices rgleason Electrical: Batteries, Generators & Solar 3 06-12-2018 09:04
How many cycles from a LiFePO4 cell? evm1024 Electrical: Batteries, Generators & Solar 20 30-09-2018 11:53
vetus waterlock-how level is level? Halifax Sailor Engines and Propulsion Systems 0 15-07-2016 05:56
Monitoring LiFePO4 Lithium Batteries sparrowhawk1 Electrical: Batteries, Generators & Solar 80 30-04-2015 17:56
New LIFEPO4 cell from CALB. Singleprop Electrical: Batteries, Generators & Solar 1 16-05-2014 19:17



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:06.


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.