ve.bus:manual_parallel_and_three_phase_systems
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ve.bus:manual_parallel_and_three_phase_systems [2019-11-28 12:53] – mvader | ve.bus:manual_parallel_and_three_phase_systems [2020-05-15 12:43] – [Theory and background information] guy_stewart | ||
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Also beware of sizing the battery cable and jumpers between cells/ | Also beware of sizing the battery cable and jumpers between cells/ | ||
- | 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/ | + | 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/ |
- | 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 | + | 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 |
- | 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:// | 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:// | ||
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* Using 2 units (A and B) parallel and using extremely good cabling one might achieve a total resistance for Unit_A of 0.0001Ω and a total resistance for Unit_B of 0.0002Ω. This results in Unit_A carrying twice as much current as Unit_B although the resistance difference is very small. | * Using 2 units (A and B) parallel and using extremely good cabling one might achieve a total resistance for Unit_A of 0.0001Ω and a total resistance for Unit_B of 0.0002Ω. This results in Unit_A carrying twice as much current as Unit_B although the resistance difference is very small. | ||
* Using the same 2 units in parallel with bad AC cabling one might end up with a total resistance for Unit_A of 15Ω and a total resistance for Unit_B of 16Ω. This results in a much better current distribution (Unit_A will carry 1.066 times more current than Unit_A) even if the absolute difference in resistance is much bigger than in the previous example (1Ω vs 0.0001Ω). | * Using the same 2 units in parallel with bad AC cabling one might end up with a total resistance for Unit_A of 15Ω and a total resistance for Unit_B of 16Ω. This results in a much better current distribution (Unit_A will carry 1.066 times more current than Unit_A) even if the absolute difference in resistance is much bigger than in the previous example (1Ω vs 0.0001Ω). | ||
+ | |||
+ | For units in 3 phase configuration: | ||
+ | We do not support a delta (Δ) configuration. A delta configuration does not have a distributed neutral and will lead to certain inverter features not operating as expected. | ||
==== A continuous, unbroken negative link must be maintained between all units ==== | ==== A continuous, unbroken negative link must be maintained between all units ==== | ||
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==== Theory and background information ==== | ==== Theory and background information ==== | ||
- | wiring | + | Wiring |
* {{: | * {{: | ||
* {{: | * {{: | ||
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The following settings need to be made in the master of each phase: | The following settings need to be made in the master of each phase: | ||
* Inverter output voltage | * Inverter output voltage | ||
- | * Input current limits.\\ This makes it possible to set a different | + | * Input current limits\\ |
* UPS function on/off | * UPS function on/off | ||
* PowerAssist settings | * PowerAssist settings | ||
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* Country / grid code standard and other grid related values (AC high/ low values) | * Country / grid code standard and other grid related values (AC high/ low values) | ||
* DC input low shut-down values. | * DC input low shut-down values. | ||
+ | |||
+ | Charger settings (voltage and current limits) are overridden if DVCC is configured and if a CANBus BMS is active in the system. | ||
A quick way to make settings in all units is the 'send to all units' feature. You'll see the option after making the changes to the first unit. | A quick way to make settings in all units is the 'send to all units' feature. You'll see the option after making the changes to the first unit. | ||
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==== Assistants ==== | ==== Assistants ==== | ||
- | | + | |
+ | Assistants can be used to expand the potential configuration options of your system, and are required in some installation types. When using assistants with multiple units, some assistants are required to be loaded onto all units in the system individually, | ||
+ | |||
+ | | ||
* PV Inverter Assistant needs to be loaded into each unit in the system. | * PV Inverter Assistant needs to be loaded into each unit in the system. | ||
* The VE.Bus BMS and the Two-Signal BMS support Assistant also need to be loaded in each unit in the system. | * The VE.Bus BMS and the Two-Signal BMS support Assistant also need to be loaded in each unit in the system. | ||
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Tip: a quick way to load Assistants into each unit in the system is to save the settings after configuring the master in L1. Then open VEConfigure for another unit and load that file. VEConfigure will automatically adapt the Assistants for the slaves. (note: In some cases you might get some warnings. Please step through the assistant in that case.) | Tip: a quick way to load Assistants into each unit in the system is to save the settings after configuring the master in L1. Then open VEConfigure for another unit and load that file. VEConfigure will automatically adapt the Assistants for the slaves. (note: In some cases you might get some warnings. Please step through the assistant in that case.) | ||
- | |||
===== Tips and hints ===== | ===== Tips and hints ===== | ||
* {{: | * {{: | ||
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===== Training Video ===== | ===== Training Video ===== | ||
- | There is an advanced training video and competency exam for 3 phase and parallel installation and commissioning available on [[https:// | + | There is an advanced training video and competency exam for 3 phase and parallel installation and commissioning available on [[https:// |
ve.bus/manual_parallel_and_three_phase_systems.txt · Last modified: 2024-07-23 05:13 by mleeftink