Hello.
I have an off-grid installation. It consists of an MP II 48/5000, 2 Smart Solar 150/60 charge controllers and a Felicity 48v 10.4 kWh lithium battery. 2 LUX-X-48100LCG01 modules. Not long ago I installed a 500mA Smart Shunt. All controlled by a Cerbo GX mk2.
My problem is that it constantly gives me a High Voltage warning. Normally whenever it reaches 100% charge, entering Absorption charging mode. The charging voltages and currents are supposed to be managed by the battery’s BMS. To solve the problem, I have decided to turn the charge controllers “OFF” when it reaches 100% charge, to avoid those High Voltage warnings. The question is the following:
Can turning off the controllers negatively affect the system when the panels are at full capacity? Would it be preferable to physically disconnect the PV input to the charge controllers?
Thank you for your attention.
Who is master in cerbo, bms or shunt ?
Pls post all settings of cerbo, bms, mppt and shunt
Please change battery monitor to smartshunt.
I think cvl 57.6 is too high for a 15s pylontech battery
The battery is a 16s LifePO4. It uses the Pylon protocol to communicate. I think that’s where the problems come from.
I replaced the battery monitor. I’ll tell you more tomorrow.
Thanks.
Too high of a voltage. Please turn on: “ Limite la tensión de carga de la batería gestionada” and set it to 55.2
There are some threads on this forum with the tag felicity-solar [i have added the tag here if you tap it it will take you to others marked the same way] and Angie-Felicity on them.
You should never need to do this. There is something else that needs attention here.
Also sometimes when batteries are new it is an expectation of that until they settle a bit.
They are felicity solar batteries.
Still to high 
I agree. There are some linked resources in the other threads for programming and bms alterations etc.
It may be that it is not doing CV control and CC control at end of charge.
Thanks for your help.
I’ve configured the Smart Shunt as a Battery Monitor and limited the charging voltage to 56.8V, as shown in the PDF Felicity provided.
I’ll have the data tomorrow.
Perfect!
I’ve been at 100% SOC since practically 11 this morning, and not a single error message. Thanks for your help.
Now I just need to decide whether to be more conservative or leave it at 56.8V as the manufacturer recommends.
Tanks
If you go lower you might interrupt the balancing function of the BMS
This is usually the better way.
If there is ever a warranty claim, there can’t be a thing where it is said … “But you didn’t follow the correct use and instructions”… And hand over an excuse for not backing up a product.