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Author Topic: Your Experience with LiFePO4 Deep Cycle Batteries?  (Read 1051 times)


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Your Experience with LiFePO4 Deep Cycle Batteries?
« on: February 09, 2018, 02:47:14 PM »
We are thinking of going with 2 to 4 of these to replace our 8 155-amp hour VMax Tank AGMs:

 I am not concerned about battery bank sizing, I have that under control, but I am interested in anyone's experiences charging these with an MPPT controller (It's a Midnight Solar Classic 150). Any experience charging and discharging these batteries, and any pointers to their best treatment would be terrific.

Here's a quick link to the charge controller, too:

Moderators - can you move this to the solar Child Board if that's more appropriate, please? Sorry for the small screw-up!

Thanks in advance!

« Last Edit: February 09, 2018, 02:49:10 PM by winslow »
2016 Outdoors RV Blackrock 22 RBS Travel Trailer
2017 Chevy Express 2500HD 60.L gas Van


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Re: Your Experience with LiFePO4 Deep Cycle Batteries?
« Reply #1 on: February 19, 2018, 08:57:45 AM »
Make sure you can program the charge voltage to the batteries so voltage stays below 14.2V.  I prefer 14.0V so I don't over charge the Lithium.  Also keep your float voltage down around 13.6-13.8V. 

Lithium prefers not to be charged to 100%, 93%-95% is best so keep that in mind.

I have a Morningstar Tristar MPPT-60 and On really bright sunny days I will turn off the controller so I am not sitting there with 14.0 volts and a few amps over charging my batteries. 

I bought the 400AH lithium battery kit from Starlight Solar in Jan 2016 and it has worked very well for us.   Here is a link to more info:  http://www.lithiumrvbattery.com/Lithium_RV_Battery/GBS_100AH_Cells.html

I also have 650watts of solar in 2 large solar panels, wired in parallel, feeding the MPPT controller with about 36V.
Al & Sharon
2006 Winnebago Journey 36G
2009 Chevy Colorado 4X4
650 watts residential solar panels--400AH Lithium batteries



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Re: Your Experience with LiFePO4 Deep Cycle Batteries?
« Reply #2 on: February 19, 2018, 06:48:11 PM »
Contact the manufacturer and ask them what the charging parameters are for their batteries.  We have recently purchased 3-Battle Born LiFePO4 batteries, I contacted Battle Born and they require 14.4V absorption, 13.6 for float and 30 minutes of absorption time charge per battery.  If you have a different brand they may have different parameters so check with them.  If you set your controller settings per the manufacturer's parameters you will not overcharge the batteries, so no concern there. Likely you will not want to equalize for these batteries and you will not need temperature compensation as generally a good idea for lead acid and AGM batteries.
Regards, Bruce, Lin An, Kenji & Suki
2015 Ram Big Horn 3500 CC Cummins TD Dually 3:73 Gears & AISIN Tranny
2019 Grand Design Solitude 310GK-R

Frank B

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Re: Your Experience with LiFePO4 Deep Cycle Batteries?
« Reply #3 on: February 19, 2018, 11:05:36 PM »
Some good information in this current thread:


IIUC, the batteries you are considering have internal overcharge protection.

« Last Edit: February 19, 2018, 11:08:11 PM by Frank B »
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