multiplus_faq
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multiplus_faq [2018-12-16 23:43] – guy_stewart | multiplus_faq [2019-02-20 13:34] – [1.3 Minimum voltage levels] guy_stewart | ||
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==== Generator Sizing ==== | ==== Generator Sizing ==== | ||
+ | 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 ^ Minimum Recommended Generator Size ^ 240V AC Input Current Limit ^ |
+ | | 800VA | 2 kVa | 5A | | ||
+ | | 1200VA | 2.5 kVa | 7A | | ||
+ | | 1600VA | 3 kVa | 10A | | ||
+ | | 3000VA | 5 kVa | 16A | | ||
+ | | 5000VA | 8 kVa | 25A | | ||
- | ^ Inverter/ | + | If your generator is smaller than the recommended size for your inverter/ |
- | | 800VA | 2 kVa | | + | |
- | | 1200VA | 2.5 kVa | | + | |
- | | 1600VA | 3 kVa | | + | |
- | | 3000VA | 5 kVa | | + | |
- | | 5000VA | 8 kVa | | + | |
- | + | ||
- | If your generator is smaller than the recommended size for your inverter/ | + | |
==== Operation ==== | ==== Operation ==== | ||
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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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For Full information on Loss of Mains detection, please see [[ve.bus: | For Full information on Loss of Mains detection, please see [[ve.bus: | ||
- | ==== What is LOM detection? ==== | ||
- | LOM is an automatic process that detects a change and loss of the generator/ | ||
- | |||
- | ==== Why is LOM detection required? ==== | ||
- | |||
- | The purpose of LOM is to detect that the Multi is no longer connected to the mains. Be that a generator or the grid. In such case, the Multi needs to open its back-feed relay. Not doing that would be unsafe. | ||
- | |||
- | ==== 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 Type A and Type B ==== | ||
- | 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 ===== | ||
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{{ : | {{ : | ||
- | ===== 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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[[https:// | [[https:// | ||
+ | [[https:// | ||
- | ===== Disqus | + | |
+ | |||
+ | ===== DISQUS | ||
~~DISQUS~~ | ~~DISQUS~~ | ||
+ |
multiplus_faq.txt · Last modified: 2023-02-16 01:50 by guy_stewart