Myenergi zappi Series Operation & Installation Manual

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Myenergi zappi Series Operation & Installation Manual Manual pdf 29 page image

zappi32 operation and installation manualInstallationAdvanced Installation OptionsLoad Balancing / Current LimitingCTs can be also used to the limit current drawn by myenergi devices to avoid overloading circuits. this is sometimes referred toas load balancing. There are four different ways to limit current and they can be used alone or combined for more complexsituations. See the table below:Function Operation ExampleDevice Limit Sets a maximum current that can be drawn by thedevice (e.g. zappi). The current will not beexceeded even during Boost or Fast charge.A zappi is wired to a 20A supply (rather than a32A). The maximum current drawn will not exceedthe set limit (e.g. 20A).Grid Limit Sets the limit that can be drawn from the gridconnection (i.e. the maximum import current). Thezappi and any other linked myenergi device, willlimit the current they draw if there is a danger ofexceeding the set Grid Limit.A property may have a grid supply limit of only 65A,several appliances are on and the property isconsuming 12kW (52A) by other appliances and theuser wants to charge in FAST mode. With a GridLimit setting of 60A, zappi would temporarilylimit the charging current to 8A (about 1.8kW) andthe maximum allowed import current would not beexceeded.Group Limit(internal CT)Sets the combined current limit for severalmyenergi devices.A property has a large PV array and a swimmingpool, three eddi units are installed to heat the poolwith surplus solar power using 3kW heaters. Thesupply for the eddi units is only 40A, to be safe aGroup Limit of 35A is set.Group Limit(with external CT)Sets the combined current limit for severalmyenergi devices that are sharing a supply withanother large appliance.An eddi is installed to heat the hot water cylinderin a garage which also has a washer and a dryer(2.5kW each), the garage has a supply of only 32Acoming from the main consumer unit in the house.If all appliances were on and there was no limitingset, the total current would exceed the maximumsupply current.Battery Storage SystemsAC coupledWhere there is an AC coupled battery storage system, there can be a conflict as both the storage system and the zappi areeffectively competing to consume the surplus energy. Whilst this is not necessarily an issue, the results can be somewhatunpredictable.There is the option to add an additional CT sensor to monitor the battery storage; this will give control as to which device haspriority. This additional CT sensor should be wired to one of the CT terminals of the zappi This CT should be clippedaround the live or neutral cable of battery inverter.During the setup process it will be necessary to change the setting for the appropriate CT to AC Battery; refer to CT Config(page 22) . Also refer to Supply Grid – Battery (page 21). for information on setting 'priority' of battery systems.