multiplus_faq
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multiplus_faq [2018-12-17 21:39] – [Generator Sizing] guy_stewart | multiplus_faq [2018-12-22 21:49] – Removed LOM questions guy_stewart | ||
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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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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/ | ||
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- | ==== Why is LOM detection required? ==== | ||
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- | 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. | ||
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- | ==== How does LOM detection relate to overload shutdowns? ==== | ||
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- | To detect a loss of mains, the inverter/ | ||
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- | 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/ | ||
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- | ==== LOM detection Type A and Type B ==== | ||
- | LOM detection comes in two flavours: **Type A** and **Type B**. | ||
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- | **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. | ||
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- | **Type B** has a more soft approach. Resulting in a slightly longer detection time. Still acceptable in several countries (South-Africa, | ||
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- | For generators on which also **Type B** does not work, see Disabling LOM. | ||
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- | ==== Disabling LOM ==== | ||
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- | 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. | ||
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- | 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/ | ||
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- | {{ : | ||
===== Example configuration in VEConfigure ===== | ===== Example configuration in VEConfigure ===== | ||
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{{ : | {{ : | ||
- | ===== Questions ===== | ||
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- | ==== Q1: Where can I get the password? ==== | ||
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- | A: From your dealer. | ||
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- | ==== Q2: Can I use ESS in a vehicle or a boat? ==== | ||
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- | 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. | ||
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- | 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. | ||
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- | ==== Q3: Can I use ESS with a generator? ==== | ||
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- | 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. | ||
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- | 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. | ||
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- | ==== 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. | ||
multiplus_faq.txt · Last modified: 2023-02-16 01:50 by guy_stewart