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--- ve.bus:manual_parallel_and_three_phase_systems [2019-12-13 03:32] – Add reminder that DVCC overrides the charger settings (just as it does in single unit systems) simonhackett
+++ ve.bus:manual_parallel_and_three_phase_systems [2020-02-13 12:27] – mvader
@@ Line 44: / Line 44: @@
 Also beware of sizing the battery cable and jumpers between cells/batteries.
-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.
+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.
-For units in parallel: use one AC fuse for all units on that phase. Both on the input, and on the output. Multiple fuses which are mechanically connected together is ok: that is also one fuse.
+With regards to AC fusing, each unit needs to be fused individually. Both on its AC-out and AC-in. Multiple circuit breakers which are mechanically connected together is OK: that is also one fuse. Make sure to use the same type of fuse on each unit due to same resistance.
-For DC, one fuse per phase is best. If a big single fuse is not available, use one fuse per unit. Same type of fuse due to same resistance.
+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.
+For both AC and DC fusing and protection, consult the product manual for details and recommended ratings.
 Beware of phase rotation between the inverter and AC in. When wired in a rotation that is different to the programming of the Multis, the system will not accept the mains input and only operates in inverter mode. [[https://www.victronenergy.com/live/ccgx:start#phase_rotation_warning|If a GX device is connected, it will signal a phase rotation alarm]]. In that case swap two phases to correct it, or re-program the units to match the wiring rotation.