Basic settings for FlexMax 60 with LiFePO4 Batteries

Discussion about the FM100, FM80, and FM60 Charge Controllers

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TechMan
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Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by TechMan » Wed Sep 12, 2018 2:56 pm

Hi,
Can someone from Outback tell me how I should set up my new FlexMax60 for use with Battleborn LiFePO4 Batteries?
The batteries do have an internal BMS. Perhaps a firmware update with a lithium battery profile??
I have the following 24V system:
Outback GVFX3524
Outback FlexMax 60
Outback MATE3
Battleborn LiFePO4 Batteries

Thanks in advance,
Techman

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Kurt Lundquist
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by Kurt Lundquist » Wed Sep 12, 2018 3:00 pm

Hi TechMan,

I suggest you ask the manufacturer what charge settings to use then program them into the FM60. You might have to set Absorb and Float to the same target voltage. It should be pretty simple because the batteries already have an internal BMS.

Cheers,

-Kurt
Kurt Lundquist
Renewable Energy Project Engineer
http://alphaenergy.us/

jbakker
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by jbakker » Thu Sep 13, 2018 4:35 am

Here is the Manual for the 12 Volt 100 AH battery they sell. Expensive batteries they are.

https://battlebornbatteries.com/wp-cont ... Manual.pdf

I run a 2018 Chevy Volt battery on my system and I have it set up for 14 cells in serries and the FM60 settings are 56.8 for Absorb and 56.4 for Float and the time 0 for both. This give me a battery voltage of 4.05 volts per cell.

Read the Manual and call the battery maker is you have questions. They should be able to help you out.

Never Never Equalize them ever.

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TechMan
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Joined: Tue Aug 21, 2018 7:17 am
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Blue Sky controller
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by TechMan » Thu Sep 13, 2018 4:44 am

Thanks All.
I did download the battery manual and their web site says to follow the AGM setting parameters.
I'll let you know how it all works out when I switch out my Blue Sky MPPT charge controller to the FM60.


Best,

Techman

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TechMan
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by TechMan » Fri Sep 14, 2018 4:35 am

FYI,
Battle Born says you can add several parallel strings but to make sure you fully charge each battery individually before connecting them,
so they will all balance correctly together.

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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by James Wilson » Thu Nov 28, 2019 12:40 pm

Battle Born told me to get each battery to 14.2 volts after half an hour of rest if I was going to put them in series. In parallel they said that they didn't need to have this step performed.

I set my FlexMax 80 to the voltages specified in Battle Born's document. And I ensured that automatic equalizing was turned off and the EQ voltage and time was as low as possible.

Does the temperature sensor really need to be disconnected?

I noticed a battery setting in Optics RE snd set it to 'Lithium'.

Are there any other settings that should be changed?

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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by raysun » Thu Nov 28, 2019 1:02 pm

"Does the temperature sensor really need to be disconnected?"

Several folks with lithium batteries are leaving the RTS connected to track ambient temperatures.

However, DO NOT use temperature compensated charging for lithium batteries.

Leaving RTS connected would require messing with the parameters for TC charging such that it does not engage across the voltage range of the battery.

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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by James Wilson » Thu Nov 28, 2019 4:14 pm

So what parameters need to be changed so that the temperature sensor doesn't change the charging voltages?

raysun
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by raysun » Thu Nov 28, 2019 9:41 pm

Not sure myself. Someone mentioned it in one of the recent posts here.

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IanMcCluskey
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by IanMcCluskey » Tue Dec 03, 2019 9:22 am

The method is to set the temperature compensated mode to Limited, and set the upper and lower limits equivalent to the absorb voltage target.
Ian McCluskey
Product Manager


Alpha Technologies Inc. / OutBack Power Technologies
3767 Alpha Way Bellingham WA 98226 USA
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Kurt Lundquist
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Re: Basic settings for FlexMax 60 with LiFePO4 Batteries

Post by Kurt Lundquist » Tue Dec 03, 2019 9:50 am

Hi Ian,

I was curious about this one myself. Do the newer A model inverters also have a limited temp comp charge option? I thought WIDE/LIMITED was only for the charge controllers. Of course if one never charges with the inverter then it doesn't matter.

Note to all:

The AXS PORT has a temp sensor port so if you are using that instead of a Mate3s you can see a second temp reading. This one does not have any effect on the system operation as far as I know.

-Kurt
Kurt Lundquist
Renewable Energy Project Engineer
http://alphaenergy.us/

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