multiplus_faq
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multiplus_faq [2018-12-17 21:39] – [Generator Sizing] guy_stewart | multiplus_faq [2019-10-17 13:48] – [3.1 Derating of the power factor] guystewart | ||
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It is possible to overload generators with the power demanded by the Multi' | It is possible to overload generators with the power demanded by the Multi' | ||
- | ^ Inverter/Charger Size ^ Recommended Generator Size ^ 240V AC Input Current Limit ^ | + | ^ Inverter Charger Size ^ Minimum |
| 800VA | 2 kVa | 5A | | | 800VA | 2 kVa | 5A | | ||
| 1200VA | 2.5 kVa | 7A | | | 1200VA | 2.5 kVa | 7A | | ||
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**AC low disconnect: | **AC low disconnect: | ||
- | On generators where the output voltage drops under load, setting this value to a higher value can help solve shutdowns on overload. | + | On generators where the output voltage drops under load, setting this value to a higher value can help resolve inverter |
- | **AC Low connect:** minimum value: at this value or any higher value, | + | The reason |
+ | If the generator is disconnected under load (either due to low-voltage disconnection, | ||
+ | |||
+ | As overload is driven by current, not power, this can result in an overload. | ||
+ | |||
+ | By increasing this minimum voltage level, you tell the inverter/ | ||
+ | |||
+ | **AC Low connect:** minimum value: at this value or any higher value, the MultiPlus will reconnect after having disconnected (default = 187Vac). | ||
===== 1.4 Maximum voltage levels ===== | ===== 1.4 Maximum voltage levels ===== | ||
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===== 1.5 Loss of mains detection (LOM) ===== | ===== 1.5 Loss of mains detection (LOM) ===== | ||
- | For Full information on Loss of Mains detection, please | + | Loss of mains detection |
- | ==== What is LOM detection? ==== | + | 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, | ||
- | LOM is an automatic process that detects a change and loss of the generator/ | + | **Disabling |
- | ==== Why is LOM detection required? ==== | + | Disabling the LOM on an input connected to the grid is only allowed when other external safety equipment |
+ | 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/ | ||
- | The purpose | + | For Full information on Loss of Mains detection, please see [[ve.bus:grid-codes-and-loss-of-mains-detection|this more detailed explanation.]] |
- | + | ||
- | ==== How does LOM detection relate to overload shutdowns? ==== | + | |
- | + | ||
- | To detect a loss of mains, the inverter/ | + | |
- | + | ||
- | When connected to a generator, with a long extension cable or long ‘last mile’ cable, the pushing and pulling on the grid does create high currents, and as a result the inverter/ | + | |
- | + | ||
- | ==== LOM detection | + | |
- | LOM detection comes in two flavours: **Type A** and **Type B**. | + | |
- | + | ||
- | **Type A** is the strongest form LOM detection, which results in the quickest detection time. It requires a low impedance connection to the grid (short, well sized cables). LOM **Type A** will not work with generators. | + | |
- | + | ||
- | **Type B** has a more soft approach. Resulting in a slightly longer detection time. Still acceptable in several countries (South-Africa, | + | |
- | + | ||
- | For generators on which also **Type B** does not work, see Disabling LOM. | + | |
- | + | ||
- | + | ||
- | ==== Disabling LOM ==== | + | |
- | + | ||
- | Besides choosing Type A and B, it is also possible to disable the LOM entirely. | + | |
- | Note 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 must be provided. Ensuring that any installer that will work on the generator will make sure to also switch off or otherwise disconnect the Inverter/ | + | |
- | {{ : | + | **Example configuration in VEConfigure** |
- | ===== Example configuration in VEConfigure | + | |
* A generator that requires LOM to be disabled. | * A generator that requires LOM to be disabled. | ||
* Generator on AC in 1, and grid on AC in 2, as recommended. | * Generator on AC in 1, and grid on AC in 2, as recommended. | ||
- | {{ :ve.bus:grid-code.png?direct |}} | + | {{::lom_generator.jpg?direct&400|}} |
- | ===== Questions ===== | ||
- | |||
- | ==== Q1: Where can I get the password? ==== | ||
- | |||
- | A: From your dealer. | ||
- | |||
- | ==== Q2: Can I use ESS in a vehicle or a boat? ==== | ||
- | |||
- | A: No you cannot. After unplugging the shore cord it can take up to a few seconds for the system to detect the loss of mains and open the back-feed relay. During those seconds, the shore power plug will be `live`: there is 230 Volts AC on the terminals. The exact number of seconds differs per country and depends on the local requirements. | ||
- | |||
- | The same applies to other solution where the wiring is not protected against accidental removing, for example a simple cable with end-user removable plug, such as a portable power supply. | ||
- | |||
- | ==== Q3: Can I use ESS with a generator? ==== | ||
- | |||
- | A: Yes you can. Note that the only installation type where that makes sense is a land based installation (no boat, and no vehicle). A Quattro must be used with AC input 1 connected to the generator, and AC input 2 connected to the grid. The role of the generator will be to provide power during a long grid failure. | ||
- | |||
- | Some, bigger or better quality generators, will be able to work with LOM **Type B**. For other less stable generators it will be required to disable LOM entirely. In that case make the installation such that it is still safe: no simple extensions cords, use enclosed wiring cabinets with warnings on the outside and/or an external ENS. | ||
- | |||
- | ==== Q4: I use ESS, but have disabled feed-back, is a grid-code still required? ==== | ||
- | |||
- | A: Yes, also in this case LOM is required to make for a safe and also local regulations compliant system. Running ESS with disabled-feed-back is still not the same as using a Multi in its default configuration without ESS. | ||
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{{: | {{: | ||
- | **Derating of the power factor** | + | ===== 3.1 Derating of the power factor |
Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the " | Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the " | ||
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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. | 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, | ||
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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 VE-Configure help menu, and more instructions are available in our manuals. | ||
+ | |||
+ | ====== 4. In the “Inverter” tab of VE-Configure: | ||
+ | |||
+ | ===== 4.1 PowerAssist ===== | ||
+ | |||
+ | The [[https:// | ||
+ | |||
+ | 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. | ||
+ | |||
+ | |||
+ | |||
+ | ====== Still not connecting? ====== | ||
+ | |||
+ | If the unit is still not connecting, switch the Multi over to Charger only mode. | ||
+ | |||
+ | Try with a different generator. | ||
+ | |||
+ | There can be issues with generators with Residual Current Devices (RCD' | ||
+ | |||
+ | |||
+ | 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. | ||
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[[https:// | [[https:// | ||
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+ | [[https:// | ||
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+ | [[https:// | ||
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- | ===== Disqus | + | ===== DISQUS |
~~DISQUS~~ | ~~DISQUS~~ |
multiplus_faq.txt · Last modified: 2024-07-17 06:57 by guy_stewart