4.1。Location ...................................................................................................................... 7 4.2.Connection of the Battery cables .......................................................................................... 7 4.3.Connection of the AC cabling .............................................................................................. 8 4.4.Optional Connections ....................................................................................................... 8 4.4.1.Second Battery .................................................................................................... 8 4.4.2.温度传感器..................................................................................................................................................................................................................................................................................................................................................................................................................................................... 8 4.4.3。Remote Control .................................................................................................... 8 4.4.4.Programmable relay .............................................................................................. 9 4.4.5.Parallel Connection (see appendix C) .......................................................................... 9 4.4.6.三相操作（请参阅附录D）............................................................................................................................................................................................................................................................................................................................................................................................................. 9