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6 Electrical ConnectionSMA Solar Technology AG <br />Installation Manual SBxx-1SP-US-41-IA-xx-12 39 <br />Controlling loads via the multifunction relay or charging batteries depending on <br />the power production of the PV system <br />The multifunction relay can control loads or charge batteries power-dependently. To enable this <br />function, you must connect a contactor (K1) to the multifunction relay. The contactor (K1) switches <br />the operating current for the load on or off. If you want batteries to be charged depending on the <br />available power, the contactor activates or deactivates the charging of the batteries. <br />B F <br />K1 <br />31 <br />= <br />= <br />max. 30 VDC Fuse <br />Figure 10 : Wiring diagram for connection for controlling a load or for the power-dependent charging of the <br />batteries <br />EN <br />G <br />L <br />I <br />S <br />H <br />534 S Sycamore St <br />- 10110979707/01/22