Hi Victron enthusiasts!
I try to describe this short and clear.
First, this is the simplified diagram from my system.
- On-grid, grid feed-in limited [0 (perfect) - 0,78 kW(max)]. Limited by the energy contract.
- System is connected to one phase in a 3-phase grid connection.
- ESS assistant
- DVCC enabled
Cause the battery is really an UPS battery and very small capacity, I do not want to use it to power the loads, only in emergency when the grid is out. I want to limit battery charging current and current from the battery (if the grid is connected). However, with current set up and settings it is not possible.
My solar power is very limited at the moment. When battery is discharging, it is ok but when battery is charging, the total PV power to the loads is limited by the charging current setting.
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When I turn on “DC-coupled PV - feed in excess” and limit it to 0 or 780 W, it will limit the PV production remarkably and the power is taken from the grid. PV power is limited by the max charging current setting.
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When I turn off “DC-coupled PV - feed in excess”, the power is not limited but it goes back to the grid which I do not want. No battery discharging limit possible. “Maximum inverter power” setting also limits PV power".
How I would like the system to work:
I priority - PV
II priority - Grid
III priority - Battery
- Battery charging current and discharging current limited. All available PV power goes to the loads and a small amount (max 780 W) to the grid. Keep the battery at 95% of charging let’s say to be ready if grid would be lost.
- If grid is lost, PV power will be priority and if not enough, take power from battery. If battery falls below certain treshold, I turn off AC OUT 2 with the AUX relay assistant (this works already).
Is there any way to achieve this without adding an additional AC-coupled PV inverter. Maybe it is possible to add another SmartShunt for measuring power from MPPT? Or maybe Lynx Shunt? Maybe some other solution to get the max discharge current setting to DVCC and not limit PV power unnecessarily.
Sorry, the explanation still turned out long, hope you get the problem. Thanks in advance.
Karl