BMS Low Temp Charging Cutoff vs. KID output to Battery

[mcneill78@windstream.net]

I have used the Kid for 6 years now and it performed flawlessly in my DIY RV van charging the 2 x 100Ah AGM batteries in parallel via 2 x 100W panels in serial.  I upgraded to 2 x 100Ah LFP batteries and added another 100W panel.  Reconfigured the KID and the system is working fine.

My concern is when the BMS on the batteries blocks charging due to low temps (set at 32F) but the KID is trying to charge the batteries.  Is this a condition that will harm the KID?  If so, what are some solutions?

[boB]

Shouldn't hurt the Kid.

The Li  batteries are still powering the Kid but I'm not sure what happens with your particular Li batteries when the BMS says  "no charging, it is too cold"

There are some BMS's that can have a separate path from discharging and charging.  I think that in that case, the Kid will just power the loads if it brings the battery bus voltage above the battery's resting no-load voltage.

What kind of LFP battery are you using now ?  Maybe that company will say what happens to the BMS and battery bank in that case ?

Interested in what we have here

boB

[ClassicCrazy]

I have used the Kid for 6 years now and it performed flawlessly in my DIY RV van charging the 2 x 100Ah AGM batteries in parallel via 2 x 100W panels in serial.  I upgraded to 2 x 100Ah LFP batteries and added another 100W panel.  Reconfigured the KID and the system is working fine.

My concern is when the BMS on the batteries blocks charging due to low temps (set at 32F) but the KID is trying to charge the batteries.  Is this a condition that will harm the KID?  If so, what are some solutions?

You are okay - if bms doesn't charge that shouldn't hurt the Kid.
Many bms will shut off charging if it gets too cold but leave the discharging on.
But I don't think it will allow any power in from the Kid for loads until the battery warms up enough again .

Larry