AMP rating for BMS, include power draw?

[Toxsick]

Hi.

I am a little uncertain how the BMS operate.

Currently my scenario is with deep cycle
So I have a charge controller that can output 60A
With a shunt my charge controller is set to charge at 40A.. but if battery has a 20A load.. the battery can still have a 40A charge. And 60A is flowing from the charge controller

I know Lifepo4 can charge quickly vs deepcycles

I understand for example a 80A output Lifepo4 BMS has 40A charge rate. How does that compare to my above scenario?

I am confused about the way a BMS works
I have a load of 20A the BMS has a 40A charge rating
Does this mean if my charge controller can charge the batteries at 20A and the other 20A is flowing through the BMS to the load on the batteries?

Regards

 

[snoobler]

Charge/discharge relate to the direction of current flow. If you have a 40A charge current and a 20A draw, you have a net 20A charge current flow.

The panels are producing 40A, the inverter nabs 20A and the remaining 20A flows to the batteries.

 

[Toxsick]

Hi
Thanks for your reply.

I think I might have self answered this after reading about BMS common vs seperate port

I was kind of more curious to the idea if the solar output had 60A on tap.

20 load
40 charge.

Would I need a 40A or 60A BMS?

Cheers

 

[snoobler]

What happens when the load goes to 0 and you have the 60A charge available?

You get the 60A to plan for worst case.