I didn't solder mine on the 600 watt setup , to me they're the same sort of thing as tv coaxial cable .
In future if I come across these buggers you can buy an adaptor from that to Anderson which is the way I will do it .
All my other setups I have just cut those plugs off and joined in longer wires (soldered) then put Anderson on other end and or directly wired into solar regulator.
Haven't had any trouble with this setup yet but now I know they sell adaptors I will use them instead .