I need some guidance on some strange system behavior.

I have two Kodak 5.48OGX(a)'s in parallel and two Kodak FL5.2 Lithium also in parallel, communication with the master inverter via RS485 CAN as well as 14 x 450Watt Panels in two strings split across the two inverters.

Master inverter is setup for Pylontech and the slave as USE.

Settings as follows as forced by the FL5.2 BMS via CAN:

Bulk Charging - 56 Volts

Float Charging - 56 Volts

Battery Cut-Off - 48 Volts

Back to Grid - 51 Volts

Back to Discharge - Full

(All the above settings keeps changing from whatever I set to the above)

Charge Source Priority - Solar & Utility

Output Source Priority - SBU

The issue is that it does not matter if battery is full or/and solar is exceeding loads - The loads are supplied by Grid as well as Solar, making cost savings not great. see Pic:

The CAN is communication perfectly with the Inverters.

 

I am using Manie's ICM Remote Management from ICC Software.

I am clueless? Any ideas.

3 hours ago, Cozy35 said:

Settings as follows as forced by the FL5.2 BMS via CAN:

Bulk Charging - 56 Volts

Float Charging - 56 Volts

Battery Cut-Off - 48 Volts

Back to Grid - 51 Volts

Back to Discharge - Full

(All the above settings keeps changing from whatever I set to the above)

Charge Source Priority - Solar & Utility

Output Source Priority - SBU

In my opinion and experience these settings are way too high. My 2 Axperts run nicely with the following settings:

Bulk Charging (26) 55V

Float Charging (27) 54V

Battery Cut-Off (29) 42V (The BMS cuts them off at 40.5V, according to data sheet)

Back to Grid (12) 47V

Back to Discharge (13) 50V

Charge Source Priority (16) C50 (solar will charge battery as first priority)

Output Source Priority (01) SBU

Try them!

It looks to me your battery capacity is quite low compared to the installed PV power. There should be a match - at least the double of what you have.

Edited January 10, 20223 yr by Beat