Differences

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--- ve.bus:manual_parallel_and_three_phase_systems [2023-10-10 11:47] – [Parallel, split- and three phase VE.Bus systems] sloges
+++ ve.bus:manual_parallel_and_three_phase_systems [2025-05-21 10:50] (current) – mvader
@@ Line 10: / Line 10: @@
   * Specify with your [[https://www.victronenergy.com/where-to-buy|Victron distributor]] that you will be connecting units in parallel or multi-phase and identical units must be supplied.
   * The same number of units need to be installed on each phase. An example to clarify: 3 units on L1, 3 on L2, and 3 on L3 is OK. But 2 on L1, 3 on L2 and 3 on L3 is not OK. The only way such non-symmetrical installation is supported is when using no monitoring at all, or a Digital Multi Control. Combining such system with any other monitoring device, such as the VE.Bus Smart Dongle or a GX device like the Cerbo is not supported. Numbers and information shown on the GX device as well as VRM portal will or can be wrong, and controlling the system, for example setting input current limits will not always work properly either.
+  * MultiPlus-II 8k, 10k, and 15k models can only be connected in parallel if an external AC transfer switch is used. For more information see the [[https://www.victronenergy.com/media/pg/MultiPlus-II_External_Transfer_Switch_application/en/index-en.html|MultiPlus-II External Transfer Switch application manual]].
   * While VE.Bus System Configurator allows setting up a system using Multis (each having a single AC input), that is configured to have multiple separate AC inputs, such system is not supported by GX devices.
   * This information does __not__ apply to the Multi RS and Inverter RS models, which use a VE.Can interface (not VE.Bus) see the RS product manuals for specific information on programming them for three phase.
@@ Line 51: / Line 52: @@
 For units in parallel: Both the DC and AC wiring needs to be symmetrical per phase: use the same length, type and cross-section to every unit in the phase. To make this easy, use a bus-bar or power-post before and after the inverter/chargers. Also, apply the same torque on all connections.
-With regards to AC fusing, each unit needs to be fused individually. Make sure to use the same type of fuse on each unit due to same resistance. Consider using mechanically connected fuses.
+With regards to AC fusing, each unit needs to be fused individually. Make sure to use the same type of fuse on each unit due to same resistance. Consider using mechanically connected fuses, so that if one trips, they all trip - leading to a clear fault.
 With regards to DC fusing, each unit needs to be fused individually. Make sure to use the same type of fuse on each unit due to same resistance.
@@ Line 104: / Line 105: @@
   * All charger settings, such as absorption voltage, float voltage and max charge current.\\ (The maximum charge current is multiplied by the number of units in the system: in a 9 unit system set it to 50A to get a 450A maximum charge current.)
   * System frequency
-  * Whether or not "Weak LOM" is used
 The following settings need to be made in the master of each phase:
   * Inverter output voltage
@@ Line 111: / Line 111: @@
   * PowerAssist settings
   * Accept wide input frequency range on/off
+  * Weak AC input on/off
 The following settings need to made in each unit in the system:
   * Country / grid code standard and other grid related values (AC high/ low values)
@@ Line 137: / Line 138: @@
   * {{:ve.bus:4._ripple_in_a_ac_battery_system.pdf|presentation - DC Ripple}}
   * {{:ve.bus:rva_-_theory_on_wiring_large_systems.pdf|presentation - Theory on wiring large systems}}
+  * {{ :ve.bus:ve_online_-_multi_and_quattro_parallel_and_3_phase.pdf | Multi and Quattro parallel and 3 phase training presentation}}
   * [[https://www.victronenergy.com/live/ve.bus:ve.bus_error_codes|VE.Bus error codes]]
   * [[https://www.victronenergy.com/support-and-downloads/software#victron-toolkit-app|Victron Toolkit App with LED code definitions]]