Adafruit In-line wire 1-to-4 splitter
If you want to connect multiple EL wires/strips/panels up to one inverter, these splitters are quite useful. There is one male connector (goes to the inverter) and then 4 female connectors (which will connect to each wire/strip/panel. You can even cascade them! Only thing to watch for is make sure that the total length of EL does not exceed what the inverter can drive!
These are for EL only! EL is 'AC' powered so there is no 'polarity' on the wires - the polarity of the pins may not line up right if you're using with anything other than EL. The wires may be 'swapped' on the 4 ends - so be super-aware of that.