MultiPlus-II 2x120V Adjustability: 50 Hz; 60 Hz Input frequency range Input frequency range accepted by the MultiPlus-II. The MultiPlus-II synchronises within this range with the AC input frequency. The output frequency is then equal to the input frequency. Adjustability: 50, 60 or 45 – 65 Hz. Input voltage range Voltage range accepted by the MultiPlus-II. The MultiPlus-II synchronises within this range with the AC input. The output voltage is then equal to the input voltage. Adjustability: Lower limit: 90 – 120V / 180 – 240V Upper limit:
120 – 140V / 240 – 280V The standard lower limit setting of 90V is intended for connection to a weak mains supply, or to a generator with unstable AC output. This setting may result in a system shut down when connected to a ‘brushless, self-excited, externally voltage regulated, synchronous AC generator’ (synchronous AVR generator). Most generators rated at 10kVA or more are synchronous AVR generators. The shutdown is initiated when the generator is stopped and revs down while the AVR simultaneously ‘tries’ to keep the output voltage of the generator at 120V.
The solution is to increase the lower limit setting to 110VAC (the output of AVR generators is generally very stable), or to disconnect the inverter/charger from the generator when a generator stop signal is given (with the help of an AC contactor installed in series with the generator). Inverter voltage Output voltage of the MultiPlus-II in battery operation. Adjustability: 95 - 128V Stand-alone / parallel operation / 2-phase / 3-phase setting Using several devices, it is possible to: Increase the total inverter power by connecting several devices in parallel. Create a split-phase system with a separate autotransformer: see the Victron Autotransformer product page . Create a 3-phase system.
The standard product settings are for standalone operation. For parallel, three-phase or split-phase operation, see the Configuring [19] chapter. AES (Automatic Economy Switch) If this setting is turned ‘on’, the power consumption in no-load operation and with low loads is decreased by approximately 20%, by slightly 'narrowing' the sinusoidal voltage. Applicable in stand-alone configuration only. Search Mode Instead of the AES mode, the search mode can also be chosen. If search mode is ‘on’, the power consumption in no-load operation is decreased by approximately 70%.
In this mode the MultiPlus-II, when operating in inverter mode, is switched off in case of no load or very low load, and switches on every two seconds for a short period. If the output current exceeds a set level, the inverter will continue to operate. If not, the inverter will shut down again. The Search Mode ‘shut down’ and ‘remain on’ load levels can be set with VEConfigure. The standard settings are: Shut down: 48 Watt (linear load) Turn on: 72 Watt (linear load) Ground relay (see appendix B) With this relay, the neutral conductor of the AC output is grounded to the chassis when the AC input relays are open.
This ensures the correct operation of earth leakage circuit breakers in the AC output. Battery charge algorithm The standard setting is ‘Four-stage adaptive with BatterySafe mode’. See Section 2 for a description. This is the recommended charge algorithm for lead acid batteries. See the help files in the software configuration programs for other settings. Page 17 Configuration