I recently had some issues where my the 40A breaker to my inverter trips when it is cloudy and the inverter import a lot power to maintain load and charge battery - typically when the time of use minimum SoC steps up when another time slot in entered.  I tried to figure out where to limit grid charge rate without affecting charge rate from PV input.  At some point I observed the following:  Load 0.52Kw, PV Input 1.54 Grid Input 2.61 and Battery charge at 3.37kw (60A).   Soc was at 57% and I unticked time of use at this point.  I cannot figure out where the 60A rate is coming from.  I have 4x Shoto 5.12 batteries.  At the time LiBMS reported max charge rate of 200A (0.5C) and voltage of 53.92V Grid charge on Battery Setting page was 38A and Max A charge at 160.  Disable float charge is unticked.

I am trying to figure out where the charge rate comes from.

 

Thanks for any pointers.

 

Jacques

Edited February 21, 20251 yr by JacquesStrydom

Suggest you try to set:

Grid Peak Shaving=8000W

And tick/use Load Priority

45 minutes ago, JacquesStrydom said:

Load 0.52Kw, PV Input 1.54 Grid Input 2.61 and Battery charge at 3.37kw (60A).   Soc was at 57% and I unticked time of use at this point.  I cannot figure out where the 60A rate is coming from.  I have 4x Shoto 5.12 batteries. 

Power was PV 1.54kW plus Grid 2.61kW, then minus 0.52kW load, and then some unspecified losses for self-consumtion and heat... left you with 3.37kW to divert to charging the battery at approx 54V charge Voltage.

Could set Max A charge then to 140A and that should all together hopefully improve its overall behaviour.

Otherwise, how much PV is connected in total?

1 hour ago, GreenFields said:

Suggest you try to set:

Grid Peak Shaving=8000W

And tick/use Load Priority

Thanks, I have not idea why or when my settings ended up as Battery First.  It was always load first.  Probably accidently touched it at some point...

1 hour ago, GreenFields said:

Power was PV 1.54kW plus Grid 2.61kW, then minus 0.52kW load, and then some unspecified losses for self-consumtion and heat... left you with 3.37kW to divert to charging the battery at approx 54V charge Voltage.

Could set Max A charge then to 140A and that should all together hopefully improve its overall behaviour.

Otherwise, how much PV is connected in total?

There is 10900kwP connected but at that point in time It could only generated the 1.54Kw.  was just wondering what make it decide to import 2.61 kwso it could charge at 60A.   Looked like abitrary number based on other limits at the time.

27 minutes ago, JacquesStrydom said:

There is 10900kwP connected but at that point in time It could only generated the 1.54Kw.  was just wondering what make it decide to import 2.61 kwso it could charge at 60A.   Looked like abitrary number based on other limits at the time.

Okay, so 140A Max Charge could be a waste. Would then say, see if 180-190A charge is okay, if you simultaneously set the Grid Peak Shaving = 8000W.