Dear Community,
i have following setup:
Multiplus 5000
2x Smart Solar Charger 250/65
620 Ah Hoppecke OpSZ 48V
Venus GX on Raspberry Pi 3
10kWp PV.
I am running ESS mode with feedin of excess Energy to the grid when the battery is full.
After the last firmware update of all components 2 weeks ago, even the limitation of feedin power seems to work. Due to the single phase connection i would like to limit the feeding to for e.g. 2kW.
The Problem:
When my battery SOC is at 100% and feedin is limited, the solar chargers toggle from absorbtion to bulk operation quite quickly (within seconds). This leads to pulsing power between roughly 0 Watts to 1600Watts to the battery, allthough it should be kept in float voltage and roughly steady 60 Watts. Also the voltage rises to ~56V for seconds. The power of the chargers also varies from 0 Watt to 1200W.
It seems the ESS System tries to reach the feedin limit but the controller oscillates very strong.
When I disable the feedin limitation, the chargers run steady up to the availlable solar power.
I was wondering if I can adjust settings of the controller or somehow prevent the smart chargers from toggling operation modes.
Help is much apprechiated, as I think the pulsing power to the charged battery is not beneficial for battery lifetime and also for the electronic components.
Thanks in advance,
mathis