Control and Monitoring via Internal Multifunction Relay
Using 2 multifunction relays, each Sunny Island can control various functions and can display operating states and warning messages.
Possible function or output | Explanation |
|---|---|
Control of generators | The multifunction relay activates if a generator request is received from the Sunny Island inverter's generator management system. With the multifunction relay, you can control generators with an electrical remote-start function or connect a signal generator for generators with no autostart function. |
Controlling load-shedding contactors | The multifunction relay is activated depending on the state of charge of the battery. Depending on the configuration, you can install a one-level load shedding with 1 multifunction relay or a two-level load shedding with 2 multifunction relays. You can also adjust the thresholds for the battery state of charge to be dependent on the time of day (see the Sunny Island inverter installation manual). |
Time control for external processes | The multifunction relays can be time-controlled (see the Sunny Island inverter installation manual). |
Display of operating states and warning messages | Each multifunction relay can display either one event or one warning message (see the Sunny Island inverter installation manual). |
Control of a battery-room fan | The multifunction relay is activated when the charging current causes the lead-acid battery to emit gasses. A connected battery room fan is switched on for at least one hour (see the Sunny Island inverter installation manual). |
Control of an electrolyte pump | Depending on the nominal energy throughput, the multifunction relay is activated at least once a day (see the Sunny Island inverter installation manual). |
Use of excess energy | In off-grid systems, a multifunction relay is activated during the constant voltage phase, and thus controls additional loads (see the Sunny Island inverter installation manual). By switching on additional loads, any excess energy that may be available and which would otherwise have to be dissipated can be put to good use. |