Victron Guides explain ESS in the Following Configurations:
- ESS Single Phase
- ESS Single Phase In a 3 phase system, (ESS only installed on Phase 1, and PV power then only supplemented to L1)
- ESS 3 Phase in a 3 Phase System
Is there a Dual phase ESS?
On a Dual Phase Multiplus installation with ESS installed on L1 and L2, ESS does not seem to function correctly. It seems to work well for L1 phase, but on the L2 phase I get huge feed from the L2 inverter to grid (Even with Feed-in Disabled).
If the answer is NO, then don't bother reading further. If Yes, then please give me some advice on what I may be doing wrong.
The Physical Setup:
The Grid Supply is 2 Phases (The way the utility provider increased the current supply to the property is by supplying an additional 230V phase (The One phase is 0 and the other 240 degrees offset. i.e. 2 phases from a 3 phase utility transformer), This gives the property 2 x 80 amp Current.
2 X Multiplus II configured as Phase 1
2 x Multiplus II configured as Phase 2 (240 degrees)
Cerbo GX, BMS.Can Battery, SmartSolar MPPT's 30kw PV.
AC1 Current output was measured as balanced to under 10% variance between L1 inverters, and the same for the L2 Inverters)
Client Requirement:
Keep battery 100% charged. Use excess PV power, to decrease the grid consumption on L1 and L2.
Configuration:
Switch as a group Ticked (Required in order to select a Grid Code)
Grid Code selected (Required by ESS)
ESS Installed on all 4 Multi's
ESS Set to "Keep batteries charged"
Grid Feed-In Disabled (Feed in not allowed by the Utility Provider)
Fault Finding:
1) With ESS installed on only the L1 Inverters, the system functions as expected.
PV Power is only supplemented to the loads on L1 Inverters, L2 Loads are only powered from the Grid)
2) With ESS additionally installed on the L2 Inverters the L1 Loads continue to be powered by the PV power, But now the Total PV Power draw is increased dramatically, and the L2 Inverters Incorrectly Feed-In to the Grid.
2b) If the battery has been discharged, then This Feed-In does not happen, and the PV supplies some charging current + Load , and the Grid the rest. (No Feed-In happens until the batteries are fully charged).
I also get regular L2 overload warnings and overload shutdown even though the Load is only 4kw (well under the 8kw combined L2 inverter capability)
Your assistance will be appreciated - With the ESS Assistants ;)