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--- multiplus_faq [2019-06-11 07:03] – guy_stewart
+++ multiplus_faq [2023-02-16 01:50] (current) – guy_stewart
@@ Line 10: / Line 10: @@
-Some generators are more suitable than others for use with inverter/chargers, please talk to your local Victron Dealer before purchasing a generator and they may be able to advise you on locally available units that have been tested and are known to be good.
+Some generators are more suitable than others for use with inverter/chargers, please talk to [[https://www.victronenergy.com/where-to-buy|your local Victron Dealer]] before purchasing a generator and they may be able to advise you on locally available units that have been tested and are known to be good. It is recommended to get a generator from a supplier that is local to you for issues and servicing.
 For example; some things to look for when selecting a generator is a high quality alternator and AVR (auto voltage regulation).
@@ Line 35: / Line 35: @@
 If your generator is smaller than the recommended size for your inverter/charger, you will definitely need to adjust the settings on the inverter/charger and reduce the AC input current limit, and/or a DC charge current limit to prevent overloading the generator.
+If you do want an inverter based generator (eg for noise reasons under lower loading), get one that is at least 30% larger than required than an equivalent AVR based model to help prevent nuisance overloads.
+It is also important to look at the DUTY CYCLE rating of the generator. Some generators are marketed for their peak output, but may only be designed to sustain 50% of that peak load rating for longer periods of time.
+Battery charging is a very heavy use case load for a generator, so make sure it is up to the job, and the installation has plenty of good airflow and ventilation when operating to allow for heat to dissipate.
+Some generators are only designed to operate for several hours, before requiring time to rest and cool down. Make sure this limitation is part of your load profile and system design.
 ==== Operation ====
@@ Line 45: / Line 52: @@
-==== Software Changes ====
+==== Software Settings ====
 The settings which you should attempt first are 'Disable UPS mode' and 'Enable Dynamic Current limiting'. These compromise features, but maintain the quality of the power supply.
-If the generator will still not synchronise or disconnects, try turning on the setting for Weak AC. This will compromise efficiency.
+If the generator will still not synchronise or disconnects, try turning on the setting for Weak AC. This will compromise efficiency, but allow for a wider variation in wave form distortion to be accepted.
 Lastly, adjusting the settings for Voltage and Frequency windows. These are higher risk to your appliances, they should only be used cautiously when it is confirmed that the loads will tolerate the out of specification power supply. This should be done by a competent technician with the aid of a multimeter and only opened so far as to allow for safe functionality.
@@ Line 59: / Line 66: @@
 Warning: changing these settings will allow to feed-through current that may be of insufficient quality for the electrical requirements of your equipment.
-For information on VE-Configure and how to get started, please see this [[https://www.victronenergy.com/support-and-downloads/software|VE Configure Software page]], or contact your [[https://www.victronenergy.com/where-to-buy|local Victron dealer.]]
+For information on VEConfigure and how to get started, please see this [[https://www.victronenergy.com/support-and-downloads/software|VE Configure Software page]], or contact your [[https://www.victronenergy.com/where-to-buy|local Victron dealer.]]
-====== 1. In the “Grid” tab of VE-Configure: ======
+====== 1. In the “Grid” tab of VEConfigure: ======
  {{:veconfigure:grid_tab.jpg?nolink&400|}}
@@ Line 102: / Line 109: @@
-===== 1.5 Loss of mains detection (LOM) =====
+===== 1.5 Loss of mains detection (LOM) (Only applicable to ESS systems) =====
+This part is only applicable on systems where a grid-code is selected (generally only ESS systems) on an off-grid system a grid code should not be used and in the selection box for grid code, 'none' should be selected.
+Loss of mains detection will push and pull at voltage and frequency to see if there is still a generating source. This process can cause issues with some generators, or high impedance connections to generators.
+For large and stable Generators Type B LOM will work, and is safer.
+However, if you are experiencing issues with voltage, frequency or power fluctuations, you may wish to try Disabling LOM.
+**Disabling LOM**
+Disabling the LOM on an input connected to the grid is only allowed when other external safety equipment is installed.
+Disabling the LOM on an input connected to generator can be done, but then other methods / warning signs / physical lockout safety measures must be provided. Ensuring that any installer that will work on the generator, wiring or system, will make sure to also switch off or otherwise disconnect the Inverter/charger system.
 For Full information on Loss of Mains detection, please see [[ve.bus:grid-codes-and-loss-of-mains-detection|this more detailed explanation.]]
-===== Example configuration in VEConfigure =====
+**Example configuration in VEConfigure**
   * A generator that requires LOM to be disabled.
   * Generator on AC in 1, and grid on AC in 2, as recommended.
-{{ :ve.bus:grid-code.png?direct |}}
+{{::lom_generator.jpg?direct&400|}}
-====== 2. In the “General” tab of VE-Configure: ======
+====== 2. In the “General” tab of VEConfigure: ======
 {{::veconfigure:general_tab.jpg?nolink&400|}}
@@ Line 132: / Line 150: @@
 ===== 2.2 AC Input Current Limit =====
-The charger on the Multiplus is very powerful. If you have an existing generator that is not able to supply the maximum charging current of the Multi, you will need to adjust the AC Input Current Limit in the General Tab of VE-Configure.
+The charger on the Multiplus is very powerful. If you have an existing generator that is not able to supply the maximum charging current of the Multi, you will need to adjust the AC Input Current Limit in the General Tab of VEConfigure.
 A reasonable starting point for the AC Current input limit is 80% of the generator capacity in Watts. For example:
@@ Line 153: / Line 171: @@
-====== 3. In the "Charger" tab of VE-Configure: ======
+====== 3. In the "Charger" tab of VEConfigure: ======
 {{:veconfigure:charger_tab.jpg?nolink&400|}}
@@ Line 164: / Line 182: @@
 This leading or lagging power factor will have the effect of demanding more kVa from the generator for the same or less DC Watts delivered to the batteries. You may need to further reduce the DC Current Limit in the Charger tab of VEConfigure if the generator continues to overload after changing this setting.
+Effectively, when Weak AC is enabled, the total charge current possible will be less that the rated maximum charge current output of the charger (under normal conditions).
 **Important note:**
-A detailed description of all settings is available in the VE-Configure help menu, and more instructions are available in our manuals.
+A detailed description of all settings is available in the VEConfigure help menu, and more instructions are available in our manuals.
-====== 4. In the “Inverter” tab of VE-Configure: ======
+====== 4. In the “Inverter” tab of VEConfigure: ======
 ===== 4.1 PowerAssist =====
@@ Line 178: / Line 198: @@
 If you have a small generator and have trouble getting connected or staying connected, Disable PowerAssist to allow the device to reduce the AC input current limit.
+====== 5. Generator control in 3 phase and parallel systems ======
+There is some specific and non-intuitive conditions when setting AC input current limits, and Charge Current limits for Large systems that involve more than one MultiPlus, and/or a GX device.
+Those specific details are articulated here:
+https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems#configuration
+Described in the online training theory here:
+@ 38 minutes and 43 seconds - https://professional.victronenergy.com/online-training/20/
+Demonstrated in the 3 phase installation training here:
+@ 25 minutes - https://professional.victronenergy.com/online-training/21/
 ====== Still not connecting? ======
-If the unit is still not connecting, switch the Multi over to Charger only mode.
+If the unit is still not connecting,
+Check the VE.Bus Monitor and AC Input Connection timer
+{{::veconfige_107016584.png?direct|}}
+With Multi firmwares xxyy460 and up, VEConfig will indicate why the AC Input is rejected and will also show an indication of the remaining waiting time as a blue bar.
+After the waiting time the unit will connect to AC input provided that there is no assistant which prevents the unit from connecting to grid and that the required relay test is performed.
+Switch the Multi over to Charger only mode.
 Try with a different generator.
-There can be issues with generators with Residual Current Devices (RCD's), control electronics or circuit breakers. There is some discussion about troubleshooting these issues on this [[https://community.victronenergy.com/questions/1702/multiplus-with-generator-and-residual-current-devi.html|Victron Community Question - Multiplus With Generator And Residual Current Device]], however as troubleshooting and correcting these faults have serious safety implications, they are best discussed with a local installer who has appropriate electrical qualifications, or your Victron Dealer.
+As troubleshooting and correcting these faults have serious safety implications, they are best discussed with a local installer who has appropriate electrical qualifications, or your Victron Dealer.
+There can be issues with generators with Residual Current Devices (RCD's), control electronics or circuit breakers. There is some discussion about troubleshooting these issues on this [[https://community.victronenergy.com/questions/1702/multiplus-with-generator-and-residual-current-devi.html|Victron Community Question - Multiplus With Generator And Residual Current Device]].
+Simplify the AC wiring, With everything safely shut down and tested for voltage, disconnect the AC-Output active, neutral and earth. Direct wire in the generator connections, with no other bus bar links. A common neutral can cause issues.
 If there is still no connection, contact your dealer or distributor. Tell them the steps that you have taken already to attempt to get it to work and they can help from there.
@@ Line 199: / Line 243: @@
 [[https://www.victronenergy.com/upload/documents/White-paper-Using-the-MultiPlus-to-reduce-operating-cost-of-a-generator-EN.pdf|Using the Multiplus to reduce operating cost of a generator]] - Fuel Saving White-paper.
+[[https://www.victronenergy.com/upload/documents/VE_Marine_generator_test_RVA_07-jan-2008.pdf|Marine Generator Test]] - Detailed testing and the application of marine diesel powered generators in small hybrid power systems
 [[https://www.victronenergy.com/live/auto-generator-start-stop:start|Automatic Generator start/stop]] - Outline and reference for generator auto-start functionality in Victron systems.
@@ Line 208: / Line 254: @@
 [[https://www.victronenergy.com/blog/2018/04/20/multiplus-quattro-inverter-chargers-improved-current-limits/|MultiPlus & Quattro Inverter/Chargers: Minimum AC Input Current Limits]]
+[[https://community.victronenergy.com/questions/1702/multiplus-with-generator-and-residual-current-devi.html|Multiplus with Generator And Residual Current Devices]]
+===== Community Discussion on MultiPlus 2x120 and generator phase compatibility =====
+[[https://community.victronenergy.com/questions/110548/multiplus-ii-2x120-generator-compatibility.html|Multiplus II 2x120 generator compatibility]]
+[[https://community.victronenergy.com/questions/128941/multiplus-ii-2x120-with-onan-5500.html|Multiplus II 2x120 with onan 5500 generator]]
-===== DISQUS =====
-~~DISQUS~~