ve.bus:manual_parallel_and_three_phase_systems
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ve.bus:manual_parallel_and_three_phase_systems [2019-12-09 11:51] – [Assistants] guy_stewart | ve.bus:manual_parallel_and_three_phase_systems [2020-04-30 00:59] – [DC and AC wiring] mleeftink | ||
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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, | + | With regards to AC fusing, each unit needs to be fused individually. Both on its AC-out |
- | 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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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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===== 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: 2024-02-09 13:07 by jpasop